Installation Instructions - Carrier · 2020. 7. 30. · Acoustic Insulation • Provide acoustic interior lining for first 20 ft of supply and return duct or until the first elbow

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53480230-01 Printed in U.S.A. Form 48A-20SI Pg 1 3-19 Replaces: 48A-18SI

Installation InstructionsCONTENTS

PageSAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . . . 3Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 4• ROOF CURB• ALTERNATE UNIT SUPPORTStep 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 4• POSITIONING• ROOF MOUNTStep 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . 21Step 4 — Make Unit Duct Connections . . . . . . . . . . 21• 48A2, A3, A6, A7 UNITS• 48A4, A5, A8, A9 UNITSStep 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 22• 48A020-050 UNITS• 48A060 UNITSStep 6 — Trap Condensate Drain. . . . . . . . . . . . . . . . 22Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . 23• OPTIONAL STAGED GAS UNITSStep 8 — Install Supply-Air Thermistors (Staged and Modulating Gas Units Only) . . . . . 23Step 9 — Make Electrical Connections . . . . . . . . . . 24• POWER WIRING• FIELD POWER SUPPLY• FIELD CONTROL WIRINGStep 10 — Make Outdoor-Air Inlet

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27• ECONOMIZER AND FIXED OUTDOOR

AIR DAMPERStep 11 — Position Power Exhaust/Barometric

Relief Damper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . 30Step 12 — Route VAV Static Pressure Sensors . 31• VAV DUCT PRESSURE TRANSDUCER• VAV BUILDING PRESSURE TRANSDUCERStep 13 — Install All Accessories . . . . . . . . . . . . . . . 31• FIELD-FABRICATED WIND BAFFLESStep 14 — Perform Field Modifications . . . . . . . . . . 33• DUCTWORKBACnet Communication Option Wiring . . . . . . . . . 33• WIRING THE UPC OPEN CONTROLLER TO THE

MS/TP NETWORK• MS/TP WIRING RECOMMENDATIONS

SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-nents. Only trained and qualified service personnel should in-stall, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenancefunctions of cleaning coils and filters and replacing filters. Allother operations should be performed by trained service

personnel. When working on air-conditioning equipment, ob-serve precautions in the literature, tags, and labels attached tothe unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloth for unbrazing operations. Havefire extinguishers available for all brazing operations.

WARNING

Before performing service or maintenance operations onunit, turn off main power switch to unit. Electrical shockcould cause personal injury.

WARNINGImproper installation, adjustment, alteration, service, ormaintenance can cause property damage, personal injury,or loss of life. Refer to the User’s Information Manual pro-vided with this unit for more details.Do not store or use gasoline or other flammable vapors andliquids in the vicinity of this or any other appliance.What to do if you smell gas:1. DO NOT try to light any appliance.2. DO NOT touch any electrical switch, or use any

phone in your building.3. IMMEDIATELY call your gas supplier from a neigh-

bor’s phone. Follow the gas supplier’s instructions.4. If you cannot reach your gas supplier, call the fire

department.

WARNING

DO NOT USE TORCH to remove any component. Systemcontains oil and refrigerant under pressure.To remove a component, wear protective gloves and gog-gles and proceed as follows:a. Shut off electrical power to unit.b. Recover refrigerant to relieve all pressure from sys-

tem using both high-pressure and low pressure ports.c. Traces of vapor should be displaced with nitrogen

and the work area should be well ventilated. Refrig-erant in contact with an open flame produces toxicgases.

d. Cut component connection tubing with tubing cutterand remove component from unit. Use a pan to catchany oil that may come out of the lines and as a gagefor how much oil to add to the system.

e. Carefully unsweat remaining tubing stubs when nec-essary. Oil can ignite when exposed to torch flame.

Failure to follow these procedures may result in personalinjury or death.

WeatherMaker®48A020-060

Single Package Gas Heating/Electric CoolingRooftop Units with ComfortLink Controls

and Puron® Refrigerant (R-410A)

2

CAUTION

DO NOT re-use compressor oil or any oil that has beenexposed to the atmosphere. Dispose of oil per local codes andregulations. DO NOT leave refrigerant system open to air anylonger than the actual time required to service the equipment.Seal circuits being serviced and charge with dry nitrogen toprevent oil contamination when timely repairs cannot be com-pleted. Failure to follow these procedures may result in dam-age to equipment.

WARNING

Disconnect gas piping from unit when pressure testing at pres-sure greater than 0.5 psig. Pressures greater than 0.5 psig willcause gas valve damage resulting in hazardous condition. Ifgas valve is subjected to pressure greater than 0.5 psig, it mustbe replaced before use. When pressure testing field-suppliedgas piping at pressures of 0.5 psig or less, a unit connected tosuch piping must be isolated by closing the manual gasvalve(s).

WARNING

CARBON-MONOXIDE POISONING HAZARDFailure to follow instructions could result in severe personalinjury or death due to carbon-monoxide poisoning, if com-bustion products infiltrate into the building.Check that all openings in the outside wall around the vent(and air intake) pipe(s) are sealed to prevent infiltration ofcombustion products into the building.Check that furnace vent (and air intake) terminal(s) are notobstructed in any way during all seasons.

AVERTISSEMENT

RISQUE D’INTOXICATION AU MONOXYDE DECARBONESi ces directives ne sont pas suivies, cela peut entraîner desblessures graves ou une intoxication au monoxyde decarbone pouvant causer la mort, si des produits decombustion s’infiltrent dans le bâtiment.Vérifier que toutes les ouvertures pratiquées dans le murextérieur autour du ou des tuyaux d’évent (et de la prised’air) sont scellées de manière à empêcher l’infiltration deproduits de combustion dans le bâtiment.Veiller à ce que la ou les sorties de l’évent de l’appareil dechauffage (et la prise d’air) ne soient, en aucune façon,obstruées, quelle que soit la saison.

WARNING

UNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could cause personal injury,death and/or equipment damage.Puron® (R-410A) refrigerant systems operate at higher pres-sures than standard R-22 systems. Do not use R-22 serviceequipment or components on Puron refrigerant equipment.

WARNING

FIRE HAZARDFailure to follow this warning could result in personal inju-ry, death, and/or property damage.Inlet pressure tap set screw must be tightened and 1/8-in.NPT pipe plug must be installed to prevent gas leaks.

WARNING

FIRE HAZARD Failure to follow this warning could result in personal inju-ry, death, and/or property damage.Manifold pressure tap set screw must be tightened and 1/8-in.NPT pipe plug must be installed to prevent gas leaks.

WARNING

If the information in this manual is not followed exactly, afire or explosion may result causing property damage, per-sonal injury or loss of life.Do not store or use gasoline or other flammable vapors andliquids in the vicinity of this or any other appliance.WHAT TO DO IF YOU SMELL GAS• Do not try to light any appliance.• Do not touch any electrical switch; do not use any

phone in your building.• Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.• If you cannot reach your gas supplier, call the fire

department.Installation and service must be performed by a qualifiedinstaller, service agency or the gas supplier.

GAS VALVE

INLET PRESSURETAP SET SCREW

MANIFOLD

GAS VALVE

MANIFOLD PRESSURE TAP SET SCREW

3

ACOUSTICAL CONSIDERATIONSIn order to minimize sound transmitted to the space, please

conform to the following recommendations (see Fig. 1):

Location• Avoid locating the unit above sound-sensitive areas.

Instead, locate the unit above restrooms, storage areas,corridors, or other noise-tolerant areas.

• Avoid mounting the unit in the middle of large roofexpanses between vertical supports. This will minimizethe phenomenon known as roof bounce.

• Install the units close to vertical roof supports (columnsor load bearing walls).

• Locate the units at least 25 ft away from critical areas. Ifthis is not possible, the ductwork and ceiling structureshould be acoustically treated.

• Consider the use of vibration isolators or an acoustic curb.

Ductwork• Utilize flexible connectors between the unit and the sup-

ply and return ducts. • Supply and return air main trunk ducts should be located

over hallways and/or public areas. • Provide trailing edge turning vanes in ductwork elbows

and tees to reduce air turbulence.• Make the ductwork as stiff as possible.• Use round duct wherever possible because it is less noisy. • Seal all penetrations around ductwork entering the space. • Make sure that ceiling and wall contractors do not attach

hangers or supports to ductwork.• Provide as smooth and gradual transition as possible when

connecting the rooftop unit discharge to the supply duct.• If a ceiling plenum return is utilized, provide a return

elbow or tee to eliminate line-of-sight noise to the space.Face the entrance of the return duct away from otheradjacent units.

Acoustic Insulation• Provide acoustic interior lining for first 20 ft of supply

and return duct or until the first elbow is encountered.The elbow prevents line-of-sight transmission in the sup-ply and return ducts.

• Install a double layer of 2-in. low density quilted fiberglassacoustical pad with a 1/8-in. barium-loaded vinyl facing ontop of the roof deck before building insulation and roofinginstallation occur. Place the material inside the curb andfor 4 to 8 ft beyond the unit perimeter, dependent uponunit size (larger units require a wider apron outside thecurb). Openings in the pad should only be large enough forthe supply and return ducts. An alternate approach is touse two layers of gypsum board with staggered seams inaddition to the acoustical pad.

AVERTISSEMENT

RISQUE DÍNCENDIE OU DÉXPLOSIONSi les consignes de sécurité ne sont pas suivies à la lettre,cela peut entraîner la mort, de graves blessures ou desdommages matériels.Ne pas entreposer ni utiliser déssence ni autres vapeurs ouliquides inflammables à proximité de cet appareil ou de toutautre appareil.QUE FAIRE SI UNE ODEUR DE GAZ EST DÉTECTÉE• Ne mettre en marche aucun appareil.• Ne toucher aucun interrupteur électrique; ne pas

utiliser de téléphone dans le bâtiment.• Quitter le bâtiment immédiatement.• Appeler immédiatement le fournisseur de gaz en

utilisant le téléphone dún voisin. Suivre lesinstructions du fournisseur de gaz.

• Si le fournisseur de gaz nést pas accessible, appeler leservice díncendie.

Línstallation et léntretien doivent être effectués par uninstallateur ou une entreprise déntretien qualifié, ou lefournisseur de gaz.

FLEXIBLECONNECTORSSUPPLY ANDRETURN

VIBRATIONISOLATORSIN ROOFCURB

INTAKEPLENUM

SUPPLYFAN

DISCHARGEPLENUM

COMPRESSOR/CONDENSINGSECTION ALL ROOF

PENETRATIONSSHOULD BESEALEDAIR TIGHT

ROUND DUCT CONTROLSRUMBLE BEST

SUPPLY AND RETURNDUCTS LINED WITHACOUSTICAL DUCT LINER

Fig. 1 — Acoustical Considerations

4

INSTALLATION

Installation of this furnace at altitudes above 2000 ft (610 m)shall be made in accordance with the Listed High AltitudeConversion Kit available with this furnace.L'installation de ce générateur de chaleur à des altitudessupérieures à 2000 pi (610 m) doit être effectuée conformé-ment aux instructions accompagnant la trousse de conversionpour haute altitude fournie avec cet appareil.

Step 1 — Provide Unit Support

ROOF CURB — For vertical discharge units, assemble or installaccessory roof curb in accordance with instructions shipped withthis accessory. See Fig. 2-4. Install insulation, cant strips, roofing,and counter flashing as shown. Ductwork can be installed to roofcurb before unit is set in place. Curb should be level. This is neces-sary to permit unit drain to function properly. Unit leveling toler-ance is shown in Fig. 2-4. Refer to Accessory Roof Curb Installa-tion Instructions for additional information as required. When ac-cessory roof curb is used, unit may be installed on class A, B, or Croof covering material.

ALTERNATE UNIT SUPPORT — When the preferred curb orslab mount cannot be used, support unit with sleepers on perime-ter, using unit curb support area. If sleepers cannot be used, sup-port long sides of unit (refer to Fig. 5-13) with a minimum numberof 4-in. x 4-in. pads spaced as follows: 48A20-035 units require 3pads on each side; 48A040-050 units require 4 pads on each side;48A060 units require 6 pads on each side. Unit may sag if support-ed by corners only.

Step 2 — Rig and Place Unit — Inspect unit for trans-portation damage. See Tables 1-6 for physical data and specifica-tions. File any claim with transportation agency.Do not drop unit; keep upright. Use spreader bars over unit to pre-vent sling or cable damage. This unit must be handled with acrane and cannot be handled by a fork truck. Level by using unitframe as a reference; leveling tolerance is shown in Fig. 2-4. SeeFig. 14 for additional information. Unit operating weight is shownin Table 2.NOTE: On retrofit jobs, ductwork may be attached to the old unitinstead of a roof curb. Be careful not to damage ductwork whenremoving old unit. Attach existing ductwork to roof curb insteadof unit.Four lifting lugs are provided on the unit base rails as shown inFig. 5-13. Refer to rigging instructions on unit.POSITIONING — Maintain clearance, per Fig. 5-13, around andabove unit to provide minimum distance from combustible mate-rials, proper airflow, and service access.Do not install unit in an indoor location. Do not locate unit airinlets near exhaust vents or other sources of contaminated air. Forproper unit operation, adequate combustion and ventilation airmust be provided in accordance with Section 5.3 (Air for Com-bustion and Ventilation) of the National Fuel Gas Code, ANSIZ223.1 (American National Standards Institute).Although unit is weatherproof, guard against water from higherlevel runoff and overhangs.Locate mechanical draft system flue assembly at least 4 ft fromany opening through which combustion products could enter thebuilding, and at least 4 ft from any adjacent building. When unit islocated adjacent to public walkways, flue assembly must be atleast 7 ft above grade.ROOF MOUNT — Check building codes for weight distribu-tion requirements. See Fig. 14. Unit operating weight is shownin Table 2.

CAUTION

Ensure clearances are in accordance with local installationcodes, the requirements of the gas supplier and the manu-facturer's installation Instructions.

ATTENTION

Assurez-vous que les dégagements sont conformes auxcodes d'installation locaux, aux exigences du fournisseur degaz et aux instructions d'installation du fabricant.

CAUTION

1. All panels must be in place when rigging or damage tounit may occur.

2. Unit is not designed for handling by fork truck. Damageto unit may occur.

IMPORTANT: The gasketing of the unit to the roof curb iscritical for a watertight seal. Install gasket with the roof curbas shown in Fig. 2-4. Improperly applied gasket can also resultin air leaks and poor unit performance.

Instructions continued on page 21.

5

Fig

. 2 —

Ro

of

Cu

rb —

48A

2,A

3,A

6,A

7020

-035

Un

its

(48A

2/A3/A

6/A7-

035 H

IGH

GAS

HEAT

ONL

Y)

NO

TE

S:

1.U

nles

s ot

herw

ise

spec

ified

, all

dim

ensi

ons

are

to o

utsi

de o

f par

t.2.

Roo

f cur

b ac

cess

ory

CR

RF

CU

RB

005A

00 is

shi

pped

dis

asse

mbl

ed.

3.A

ll ro

of c

urb

parts

are

to b

e 14

ga.

gal

vani

zed

stee

l.4.

Dim

ensi

ons

in [

] are

in m

illim

eter

s. A

ll ot

her d

imen

sion

s ar

e in

inch

es.

6

Fig

. 3 —

Ro

of

Cu

rb —

48A

2,A

3,A

6,A

7040

-050

Un

its

NO

TE

S:

1.U

nles

s ot

herw

ise

spec

ified

, all

dim

ensi

ons

are

to o

utsi

de o

f par

t.2.

Roo

f cur

b ac

cess

ory

CR

RF

CU

RB

006A

00 is

shi

pped

dis

asse

mbl

ed.

3.A

ll ro

of c

urb

parts

are

to b

e 14

ga.

gal

vani

zed

stee

l.4.

Dim

ensi

ons

in [

] are

in m

illim

eter

s. A

ll ot

her d

imen

sion

s ar

e in

inch

es.

7

Fig

. 4 —

Ro

of

Cu

rb —

48A

2,A

3,A

6,A

7060

Un

its

a48-6717

NO

TE

S:

1.U

nles

s ot

herw

ise

spec

ified

, all

dim

ensi

ons

are

to o

utsi

de o

f par

t.2.

Roo

f cur

b ac

cess

ory

CR

RF

CU

RB

014A

00 is

shi

pped

dis

asse

mbl

ed.

3.A

ll ro

of c

urb

parts

are

to b

e 14

ga.

gal

vani

zed

stee

l.4.

Dim

ensi

ons

in [

] are

in m

illim

eter

s. A

ll ot

her d

imen

sion

s ar

e in

inch

es.

8

Fig

. 5 —

Bas

e U

nit

Dim

ensi

on

s —

48A

2,A

3,A

6,A

7020

-035

7. D

IMEN

SION

S AR

E IN

INCH

ES [M

M].

9

Fig

. 6 —

Bas

e U

nit

Dim

ensi

on

s —

48A

2,A

3,A

6,A

7040

-050

A48-8689

A48-8689NO

TE

S:

1.W

eigh

ts in

clud

e ec

onom

izer

.2.

c

ente

r of g

ravi

ty.

3.U

nit c

lear

ance

s:

Top

of u

nits

: no

over

hang

C

onde

nser

coi

l: 4’

- 0”

[121

9]

Eco

nom

izer

sid

e: 6

’ - 0

” [1

829]

H

eat s

ide:

4’ -

0” [

1219

]

Filt

er a

cces

s si

de: 1

0’ -

0” [3

048]

(for

r

emov

al o

f eva

pora

tor c

oil)

4.B

otto

m d

ucts

are

des

igne

d to

be

atta

ched

toac

cess

ory

roof

cur

b. I

f un

it is

mou

nted

on

dunn

age,

it

is r

ecom

men

ded

that

the

duc

tsbe

sup

port

ed b

y cr

oss

brac

es a

s do

ne o

nac

cess

ory

roof

cur

b.5.

Dim

ensi

ons

in [

] are

in m

illim

eter

s. A

ll ot

her

dim

ensi

ons

are

in in

ches

.

*Ope

ratin

g w

eigh

t inc

lude

s la

rges

t ind

oor

fan

mot

or, m

icro

-ch

anne

l he

at e

xcha

nger

, m

odul

atin

g po

wer

exh

aust

(va

ri-ab

le

air

volu

me

units

),

and

varia

ble

freq

uenc

y dr

ive

(var

iabl

e ai

r vo

lum

e un

its).

10

Fig

. 7 —

Bas

e U

nit

Dim

ensi

on

s —

48A

4,A

5,A

8,A

9020

-035

6. D

IMEN

SION

S AR

E IN

INCH

ES [M

M].

11

Fig

. 8 —

Bas

e U

nit

Dim

ensi

on

s —

48A

4,A

5,A

8,A

9040

-050

*Ope

ratin

g w

eigh

t inc

lude

s la

rges

t ind

oor f

an m

otor

, mic

ro-

chan

nel h

eat

exch

ange

r, m

odul

atin

g po

wer

exh

aust

(va

ri-ab

le

air

volu

me

units

),

and

varia

ble

freq

uenc

y dr

ive

(var

iabl

e ai

r vo

lum

e un

its).

NO

TE

S:

1.W

eigh

ts in

clud

e ec

onom

izer

.2.

cen

ter o

f gra

vity

3.U

nit c

lear

ance

s:

Top

of u

nits

: no

over

hang

Con

dens

er c

oil:

4’ - 0

” [12

19]

E

cono

miz

er s

ide:

6’ -

0” [

1829

]

Hea

t sid

e: 4

’ - 0

” [12

19]

F

ilter

acc

ess

side

: 10’

- 0”

[304

8] (f

or

rem

oval

of e

vapo

rato

r coi

l)4.

For

sm

alle

r se

rvic

e an

d op

erat

iona

l cl

ear-

ance

s, c

onta

ct C

arrie

r ap

plic

atio

n en

gine

er-

ing

depa

rtmen

t.5.

Bot

tom

duc

ts a

re d

esig

ned

to b

e at

tach

ed to

acce

sso r

y ro

of c

urb.

If

unit

is m

ount

ed o

ndu

nnag

e, i

t is

rec

omm

ende

d th

at t

he d

ucts

be s

uppo

rted

by c

ross

bra

ces

as d

one

onac

cess

ory

roof

cur

b.6.

Dim

ensi

ons

in [

] are

in m

illim

eter

s. A

ll ot

her

dim

ensi

ons

are

in in

ches

.

12

But

Fig

. 9 —

Bas

e U

nit

Dim

ensi

on

s M

CH

X, B

ott

om

Su

pp

ly a

nd

Ret

urn

— 4

8A2,

A3,

A6,

A70

60

FO

R

CE

NT

ER

S

OF

G

RA

VIT

Y,

OP

ER

AT

ING

A

ND

C

OR

NE

RW

EIG

HT

S, S

EE

FIG

. 13.

311.

28[7

906.

6]

85.0

9[2

161]

161.

66[4

106]

133.

69[3

396]

42.5

6[1

081]

65.9

1[1

674]

45.0

6[1

145]

41.7

2[1

060]

20.1

8[5

13]

2.10

[53]

82.0

2[2

083]

2.99

[76]

7/8

" DIA

[22]

LOW

VO

LTAG

E

78.6

0[1

997]

94.0

0[2

388]

91.5

0[2

324]

88.0

0[2

235]

49.5

3[1

258]

30.1

2[7

65]

22.7

2[5

77]

88.2

4[2

241]

TOP

CO

VER

S

10.4

9[2

66]

50.0

0[1

270]

50.0

0[1

270]

50.0

0[1

270]

2.57

[65]

2.57

[65]

1"[2

5]N

PT D

RAI

NC

ON

N

1.37

5 D

IA [3

5]34

.46

[875

]

70.0

5[1

779]

29.4

0[7

47]

24.4

0[6

20]

8.05

[204

]

44.2

8[1

125]

9.56

[243

]

13.8

8[3

53]

0.75

NPT

LO

W V

OLT

AGE

[19]

3.50

NPT

FIE

LD P

OW

ER[8

9]

24[6

13]

24[6

13]

15.5

3[3

95]

15.9

3[4

05]

8.60

[218

]16

2.90

[413

8]

17.4

7[4

44]

43.

43 [1

103]

92.

63 [2

3.53

]

141

.86

[36.

03]

7.50

[190

]

19.0

6[4

84]

17.9

1[4

55]

42.3

1[1

075]

18.2

5[4

64]

45.4

4[1

154]

OPE

NIN

G

31.2

5[7

95]

OPE

NIN

G

HO

OD

REM

OVE

DD

AMPE

R O

PEN

ING

WIT

H H

OO

D

WIT

H P

ANEL

PAN

EL R

EMO

VED

VIEW

A-A

NO

PO

WER

EXH

AUST

OR

BAR

OM

ETR

IC R

ELIE

F

IND

OO

R B

LOW

ERAC

CES

S PA

NEL

HEA

T SE

CTI

ON

ACC

ESS

PAN

EL

MC

HX

CO

ILS

V F D

OVE

RAL

L LI

FTIN

GSH

IPPI

NG

DIM

LIFT

ING

PO

SITI

ON

BASE

FR

AME

TYP

4PL

ACES

ECO

NO

MIZ

ER H

OO

DS

(HO

OD

S FI

ELD

INST

ALLE

D)

(INC

LUD

ED W

ITH

UN

IT)

3 R

EQ'D

IND

OO

R M

OTO

RAC

CES

S D

OO

R (H

ING

ED)

FILT

ER/A

UX

CO

NTR

OL

BOX

ACC

ESS

DO

OR

(HIN

GED

)

SUPP

LY A

IR

ECO

NAI

R AUXI

LIAR

YC

ON

TRO

LBO

X

EXH

AUST

AIR

POW

ER E

XHAU

STO

R B

ARO

MET

RIC

REL

IEF

HO

OD

SO

PTIO

N3

REQ

'D

2.50

[64]

NPT

GAS

INLE

T H

OLE

MAI

N C

ON

TRO

L BO

X

V F D

AA

RET

UR

N

SUPP

LY

ACC

ESS

DO

OR

S (H

ING

ED)

CO

NTR

OL

BOX

/ CO

MPR

ESSO

R

INSI

DE

BASE

RAI

LS

RET

UR

NAI

R3"

DIA

[76]

FIEL

D W

IRIN

G (2

)

LIFT

ING

LU

GH

OLE

IN

WIN

D C

AP(F

IELD

INST

ALLE

D)

13

Fig

. 10

— B

ase

Un

it D

imen

sio

ns

MC

HX

, Sid

e S

up

ply

an

d R

etu

rn —

48A

4,A

5,A

8,A

9060

311.

28[7

906.

6]

85.0

9[2

161]

161.

66[4

106]

133.

69[3

396]

42.5

6[1

081] 65

.91

[167

4]

45.0

6[1

145]

41.7

2[1

060]

20.1

8[5

13] 2.

10[5

3]

82.0

2[2

083]

2.99

[76]

7/8

" DIA

[22]

LOW

VO

LTA

GE

78.6

0[1

997]

94.0

0[2

388]

91.5

0[2

324]

88.0

0[2

235]

49.5

3[1

258]

30.1

2[7

65]

22.7

2[5

77]

88.2

4[2

241]

TOP

CO

VE

RS

10.4

9[2

66]

50.0

0[1

270]

50.0

0[1

270]

50.0

0[1

270]

2.57

[65]

2.57

[65]

1"[2

5]N

PT

DR

AIN

CO

NN

1.37

5 D

IA [3

5]

34.4

6[8

75]

70.0

5[1

779]

29.4

0[7

47]

24.4

0[6

20]

8.05

[204

]

44.2

8[1

125]

9.56

[243

]

13.8

8[3

53]

0.75

NP

T LO

W V

OLT

AG

E[1

9]3.

50 N

PT

FIE

LD P

OW

ER

[89]

6.97

[177

.0]

13.2

0[3

35.3

]

5.12

[130

.0]

12.9

3[3

28.3

]15

0.47

[382

2.0]

12.6

3[3

20.8

]

43.

43 [1

103]

92.

63 [2

3.53

]

141

.86

[36.

03]

7.50

[190

]

19.0

6[4

84]

17.9

1[4

55]

VIE

W A

-A

IND

OO

R B

LOW

ER

AC

CE

SS

PA

NE

L

HE

AT

SE

CTI

ON

AC

CE

SS

PA

NE

L

MC

HX

CO

ILS

V F D

OV

ER

ALL

LIF

TIN

GS

HIP

PIN

G D

IM

LIFT

ING

PO

SIT

ION

BA

SE

FR

AM

E

TYP

4P

LAC

ES

EC

ON

OM

IZE

R H

OO

DS

(HO

OD

S F

IELD

INS

TALL

ED

)(IN

CLU

DE

D W

ITH

UN

IT)

3 R

EQ

'D

IND

OO

R M

OTO

RA

CC

ES

S D

OO

R (H

ING

ED

)

FILT

ER

/AU

X C

ON

TRO

L B

OX

AC

CE

SS

DO

OR

(HIN

GE

D)

RE

TUR

NA

IR SU

PP

LYA

IR

EC

ON

AIR

AU

XIL

IAR

YC

ON

TRO

LB

OX

2.50

[64]

NP

TG

AS

INLE

T H

OLE

MA

IN C

ON

TRO

L B

OX

V F D

AA

AC

CE

SS

DO

OR

S (H

ING

ED

)C

ON

TRO

L B

OX

/ C

OM

PR

ES

SO

R

INS

IDE

BA

SE

RA

ILS

3" D

IA [7

6]FI

ELD

WIR

ING

(2)

LIFT

ING

LU

GH

OLE

IN

WIN

D C

AP

(FIE

LDIN

STA

LLE

D)

FO

R

CE

NT

ER

S

OF

G

RA

VIT

Y,

OP

ER

AT

ING

A

ND

C

OR

NE

RW

EIG

HT

S, S

EE

FIG

. 13.

14

70.7

5[1

797]

65.9

1[1

674]

45.0

6[1

145]

41.7

2[1

060]

34.4

6[8

75]

30.1

2[7

65]

78.

60 [1

997]

TYP

4 P

LAC

ES

AU

XIL

IAR

YC

ON

TRO

LB

OX

EC

ON

OM

IZE

R H

OO

DS

(HO

OD

S F

IELD

INS

TALL

ED

)(IN

CLU

DE

D W

ITH

UN

IT)

3 R

EQ

'D

AC

CE

SS

DO

OR

S (H

ING

ED

)C

ON

TRO

L B

OX

/ C

OM

PR

ES

SO

R

IND

OO

R M

OTO

RA

CC

ES

S D

OO

R (H

ING

ED

)FI

LTE

R/A

UX

CO

NTR

OL

BO

XA

CC

ES

S D

OO

R (H

ING

ED

)

HE

AT

SE

CTI

ON

AC

CE

SS

PA

NE

LIN

DO

OR

BLO

WE

RA

CC

ES

S P

AN

EL

CO

ND

EN

SE

R C

OIL

BO

TH S

IDE

S

3" D

IA [7

6]FI

ELD

WIR

ING

(2)

7/8'

DIA

[22]

LOW

VO

LTA

GE

EC

ON

AIR

RE

TUR

NA

IR

1" [2

5] N

PT

DR

AIN

CO

NN

BA

SE

FR

AM

E

LIFT

ING

PO

SIT

ION

OV

ER

ALL

LIF

TIN

GS

HIP

PIN

G D

IM

MA

IN C

ON

TRO

L B

OX

INS

IDE

BA

SE

RA

ILS

1.37

5 [3

5] D

IAH

OLE

IN

LIFT

ING

LU

G

V F D V F D

VIE

W A

-A

AA

3.50

[89]

NP

T FI

ELD

PO

WE

R

SU

PP

LYA

IR

.75

[19]

NP

T LO

W V

OLT

AG

E

73.1

2[1

857]

42.5

6[1

081]

20.1

8[5

13] 2

.10

[53]

82.0

2[2

083]

2.99

[76]

8.05

[204

]

24.4

0[6

20]

29.4

0[7

47]

85.0

9[2

161]

311.

28[7

906.

6]

22.7

2[5

77]

94.0

0[2

388]

91.5

0[2

324]

88.0

0[2

235]

49.5

3[1

258]

133.

69[3

396]

88.2

4 TO

P C

OV

ER

S[2

241]

10.4

9[2

66]

50.0

0[1

270]

2.57

[65]

50.0

0[1

270]

2.57

[65]

50.0

0[1

270]

161

.66

[410

6]

6.97

[177

.0]

13.2

0[3

35.3

]

5.12

[130

.0]

12.9

3[3

28.3

]15

0.47

[382

2.0]

12.6

3[3

20.8

]

9.5

6 [2

43]

13.

88 [3

53]

44.

28 [1

125]

LOW

SO

UN

D O

UTD

OO

R F

AN

OP

TIO

N O

NLY

(ALL

FA

N P

OS

ITIO

NS

)

STA

ND

AR

D O

UTD

OO

R F

AN

Fig

. 11

— B

ase

Un

it D

imen

sio

ns

RT

PF

, Cu

Tu

be

Co

nd

ense

r S

ide

Su

pp

ly a

nd

Ret

urn

— 4

8A4,

A5,

A8,

A90

60

FO

R C

EN

TE

RS

OF

GR

AV

ITY

,O

PE

RA

TIN

G

AN

D

CO

RN

ER

WE

IGH

TS

, SE

E F

IG. 1

3.

15

85.0

9[2

161]

311.

28[7

906.

6]

88.2

4 TO

P C

OV

ER

S[2

241]

10.4

9[2

66]

50.0

0[1

270]

2.57

[65]

50.0

0[1

270]

2.57

[65]

50.0

0[1

270]

161

.66

[410

6]

9.5

6 [2

43]

13.

88 [3

53]

44.

28 [1

125]

78.

60 [1

997]

42.3

1[1

075]

18.2

5[4

64]

31.2

5[7

95]

OP

EN

ING

45.4

4[1

154]

OP

EN

ING

94.0

0[2

388]

91.5

0[2

324]

88.0

0[2

235]

49.5

3[1

258]

30.1

2[7

65]

22.7

2[5

77]

1"[2

5]N

PT

DR

AIN

CO

NN

133.

69[3

396]

42.5

6[1

081]

65.9

1[1

674]

45.0

6[1

145]

41.7

2[1

060]

20.1

8[5

13]

2.10

[53]

82.0

2[2

083]

2.99

[76]

7/8

" DIA

[22]

LOW

VO

LTA

GE

78.6

0[1

997] 1.37

5 D

IA [3

5]34

.46

[875

]

70.0

5[1

779]

29.4

0[7

47]

24.4

0[6

20]

8.05

[204

]

17.4

7[4

44]

162.

90[4

138]

8.60

[218

]

15.9

3[4

05]

24[6

13]

15.5

3[3

95]

24[6

13]

HE

AT

SE

CTI

ON

AC

CE

SS

PA

NE

LIN

DO

OR

BLO

WE

RA

CC

ES

S P

AN

EL

CO

ND

EN

SE

R C

OIL

BO

TH S

IDE

S

MA

IN C

ON

TRO

L B

OX

V F D V F D

AA

3.50

[89]

NP

T FI

ELD

PO

WE

R

.75

[19]

NP

T LO

W V

OLT

AG

E

LOW

SO

UN

D O

UTD

OO

R F

AN

OP

TIO

N O

NLY

(ALL

FA

N P

OS

ITIO

NS

)

STA

ND

AR

D O

UTD

OO

R F

AN

HO

OD

RE

MO

VE

DD

AM

PE

R O

PE

NIN

GW

ITH

HO

OD

WIT

H P

AN

EL

PA

NE

L R

EM

OV

ED

VIE

W A

-AN

O P

OW

ER

EX

HA

US

T O

R B

AR

OM

ETR

IC R

ELI

EF

OV

ER

ALL

LIF

TIN

G S

HIP

PIN

G D

IM

LIFT

ING

PO

SIT

ION

BA

SE

FR

AM

E

TYP

4P

LAC

ES

EC

ON

OM

IZE

R H

OO

DS

(HO

OD

S F

IELD

INS

TALL

ED

)(IN

CLU

DE

D W

ITH

UN

IT)

3 R

EQ

'D

IND

OO

R M

OTO

RA

CC

ES

S D

OO

R (H

ING

ED

)

FILT

ER

/AU

X C

ON

TRO

L B

OX

AC

CE

SS

DO

OR

(HIN

GE

D)

RE

TUR

NA

IRS

UP

PLY

AIR

EC

ON

AIR A

UX

ILIA

RY

CO

NTR

OL

BO

X

EX

HA

US

TA

IR

PO

WE

R E

XH

AU

ST

OR

BA

RO

ME

TRIC

RE

LIE

F H

OO

DS

OP

TIO

N3

RE

Q'D

AC

CE

SS

DO

OR

S (H

ING

ED

)C

ON

TRO

L B

OX

/ C

OM

PR

ES

SO

R

INS

IDE

BA

SE

RA

ILS

3" D

IA [7

6]FI

ELD

WIR

ING

(2)

LIFT

ING

LU

GH

OLE

IN

RE

TUR

N

SU

PP

LY

Fig

. 12

— B

ase

Un

it D

imen

sio

ns

RT

PF

, CU

Tu

be

Co

nd

ense

r B

ott

om

Su

pp

ly a

nd

Ret

urn

— 4

8A2,

A3,

A6,

A70

60

FO

R C

EN

TE

RS

OF

GR

AV

ITY

,O

PE

RA

TIN

G

AN

D

CO

RN

ER

WE

IGH

TS

, SE

E F

IG. 1

3.

16

Fig

. 13

— C

ente

r o

f G

ravi

ty a

nd

Wei

gh

ts —

48A

060

A

B

NO

TES

: 1

. WE

IGH

TS IN

CLU

DE

EC

ON

OM

IZE

R O

R O

UTD

OO

R A

IR D

AM

PE

R.

2.

CE

NTE

R O

F G

RA

VIT

Y.

3. F

OR

MU

LTIP

LE U

NIT

AP

PLI

CA

TIO

NS

SE

E L

ITE

RA

TUR

E.

4. U

NIT

CLE

AR

AN

CE

S:

TO

P O

F U

NIT

S: N

O O

VE

RH

AN

G

C

U T

UB

E C

ON

DE

NS

ER

CO

IL: 4

'-0" [

1219

]

H

EA

T S

IDE

: 4'-0

" [12

19]

FIL

TER

AC

CE

SS

SID

E:

1

5'-0

" [45

72] (

FOR

RE

MO

VA

L O

F E

VA

PO

RA

TOR

CO

IL)

5.

FOR

SM

ALL

ER

SE

RV

ICE

AN

D O

PE

RA

TIO

NA

L

CLE

AR

AN

CE

S, C

ON

TAC

T C

AR

RIE

R A

PP

LIC

ATI

ON

EN

GIN

EE

RIN

G D

EP

AR

TME

NT.

6.

BO

TTO

M D

UC

TS D

ES

IGN

ED

TO

BE

ATT

AC

HE

D T

O

A

CC

ES

SO

RY

RO

OF

CU

RB

. IF

UN

IT IS

MO

UN

TED

ON

DU

NN

AG

E, I

T IS

RE

CO

MM

EN

DE

D T

HE

DU

CTS

MU

ST

BE

SU

PP

OR

TED

BY

CR

OS

S B

RA

CE

S A

S

D

ON

E O

N A

CC

ES

SO

RY

RO

OF

CU

RB

.7.

B

AS

E U

NIT

WE

IGH

TS IN

CLU

DE

OU

TDO

OR

AIR

HO

OD

S,

AN

D F

ILTE

RS

(IN

DO

OR

FA

N M

OTO

R IS

NO

T IN

CLU

DE

D).

AD

D IN

DO

OR

MO

TOR

, FIO

PS

AN

D A

CC

ES

SO

RIE

S F

OR

TOTA

L O

PE

RA

TIN

G W

EIG

HT.

8.

VA

V M

OTO

R W

EIG

HTS

INC

LUD

E IN

DO

OR

MO

TOR

, VFD

,

V

FD T

RA

NS

DU

CE

R A

ND

AS

SO

CIA

TED

WIR

ING

.9.

D

IME

NS

ION

S IN

[ ] A

RE

IN M

ILLI

ME

TER

S, K

ILO

GR

AM

S

O

R K

ILO

WA

TTS

.10

. FO

R S

IDE

-SU

PP

LY/R

ETU

RN

AP

PLI

CA

TIO

NS

, A S

ING

LE

R

ETU

RN

AN

D S

UP

PLY

DU

CTW

OR

K C

ON

NE

CTI

ON

IS

R

EC

OM

ME

ND

ED

FO

R C

OV

ER

ING

ALL

TH

RE

E R

ETU

RN

AN

D

A

LL T

HR

EE

SU

PP

LY O

PE

NIN

GS

. TH

E E

NTI

RE

AR

EA

AR

OU

ND

TH

E D

UC

T O

PE

NIN

GS

IS A

VA

ILA

BLE

FO

R A

1.5"

DU

CT

FLA

NG

E A

TTA

CH

ME

NT.

UN

IT S

IZE

OP

ER

ATI

NG

WE

IGH

T C

EN

TER

OF

GR

AV

ITY

C

OR

NE

R W

EIG

HT

(LB

) A

BLB

SFT

/INFT

/IN1

23

448

A2/

A3/

A6/

A7

(D,M

,S) 0

6083

8614

- 9

5/8"

3 - 5

1/4

"19

0916

9322

4325

41

48A

2/A

3/A

6/A

7 (E

,N,T

) 060

8626

14 -

2 3/

8"3

- 3 1

/4"

2159

1745

2100

2622

48A

4/A

5/A

7/A

8 (D

,M,S

) 060

8426

14 -

1 5/

8"3

- 9 1

/4"

1763

2072

2259

2333

48A

4/A

5/A

7/A

8 (E

,N,T

) 060

8676

13 -

7 1/

4"3

- 7 1

/4"

2000

2126

2134

2417

50A

2/A

3/A

6/A

7 06

083

1115

- 5"

3 - 7

3/8

"17

1016

6324

3325

04

50A

4/A

5/A

7/A

8 06

085

2614

- 8

1/2"

3 - 1

1 1/

8"16

1320

7824

8423

51

BA

SE

UN

IT W

EIG

HTS

(SE

E N

OTE

7)

LB (K

g)

060

48A

2D/A

3D/A

6D/A

7D70

66 (3

205)

48A

2E/A

3E/A

6E/A

7E73

06 (3

314)

48A

4D/A

5D/A

8D/A

9D71

06 (3

223)

48A

4E/A

5E/A

8E/A

9E73

56 (3

337)

50A

2/A

3/A

6E/A

7E68

26 (3

096)

50A

4/A

5/A

8E/A

9E70

41 (3

194)

OP

TIO

NS

/ A

CC

ES

SO

RIE

S (S

EE

NO

TE 7

)

BA

RO

ME

TRIC

RE

LIE

F45

0 (2

04)

NO

N M

OD

. PO

WE

R E

XH

AU

ST

675

(306

)

MO

D. P

OW

ER

EX

HA

US

T72

5 (3

29)

ELE

CTR

IC H

EA

T16

5 (7

5)

CU

TU

/AL

FIN

CO

ND

CO

IL26

(12)

CU

TU

/CU

FIN

CO

ND

CO

IL67

7 (3

07)

CV

MO

TOR

WE

IGH

TSLB

(Kg)

VA

V M

OTO

R W

EIG

HTS

LB (K

g) (S

EE

NO

TE 8

)

HIG

HE

FFC

'Y IF

MP

RE

MIU

ME

FFC

'Y IF

MH

IGH

EFF

C'Y

IFM

PR

EM

IUM

EFF

C'Y

IFM

25 H

P(1

8.65

kW

)23

0/46

024

0 (1

09)

309

(140

)37

5 (1

70)

444

(201

)57

524

0 (1

09)

319

(145

)37

5 (1

70)

454

(206

)

30 H

P(2

2.38

kW

)23

0/46

028

3 (1

28)

355

(161

)41

8 (1

90)

490

(222

)57

528

3 (1

28)

359

(163

)41

8 (1

90)

494

(224

)

40 H

P(2

9.84

kW

)23

0/46

037

2 (1

69)

415

(188

)50

7 (2

30)

550

(249

)57

537

2 (1

69)

410

(186

)50

7 (2

30)

545

(247

)

UN

IT S

IZE

OP

ER

ATI

NG

WE

IGH

T C

EN

TER

OF

GR

AV

ITY

CO

RN

ER

WE

IGH

T (k

g)A

BK

GM

MM

M1

23

448

A2/

A3/

A6/

A7

(D,M

,S) 0

6038

0445

1110

4986

676

810

1711

53

48A

2/A

3/A

6/A

7 (E

,N,T

) 060

3913

4329

996

979

792

953

1189

48A

4/A

5/A

7/A

8 (D

,M,S

) 060

3822

4309

1149

800

940

1024

1058

48A

4/A

5/A

7/A

8 (E

,N,T

) 060

3936

4147

1097

907

964

968

1096

50A

2/A

3/A

6/A

7 06

037

7046

9811

0277

675

511

0411

36

50A

4/A

5/A

7/A

8 06

038

6844

8411

9673

294

211

2710

66

12

43

OFM

#4O

FM#2

OFM

#3O

FM#1

EC

ON

OM

IZE

R S

IDE

:

6'-0

" [18

29] (

FOR

TU

BE

CO

ND

EN

SE

R C

OIL

S)

8

'-0" [

2438

] (FO

R R

EM

OV

AL

OF

MC

HX

CO

ND

EN

SE

R C

OIL

S)

17

Table 1 — Physical Data — 48A Units

LEGEND * Sizes 020 to 027: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper portion.Sizes 030 and 035: Circuit 1 uses the upper portion of condenser coil, Circuit 2 uses the lower portion.Sizes 040 and 050: Circuit 1 uses the left condenser coil, Circuit 2 the right.Size 060: Circuit A uses the two MCHX coils near the bulkhead, Circuit B uses thetwo MCHX coils near the control box.

† Rollout switch is manual reset.

UNIT 48A 020D/E 025D/E 027D/E 030D/ENOMINAL CAPACITY (tons) 20 25 27 30BASE UNIT See Unit Weights TableOPERATING WEIGHT (lb)COMPRESSOR Quantity ... Type (Ckt 1/Ckt 2) 2 ... ZP67/1…ZP91 2 ... ZP91/1…ZP91 2 ... ZP91/1…ZP91 2…ZP72, 2…ZP72 Number of Refrigerant Circuits 2 2 2 2 Oil Precharged Precharged Precharged PrechargedREFRIGERANT R-410A Operating Charge (lb), Ckt 1/Ckt 2 RTPF Coils 26.2/18.8 30.2/15.2 32.8/16.5 30.5/34.3 MCHX Coils 14.9/11.8 16.5/11.0 16.5/11.0 15.1/15.3 MCHX Coils with Humidi-MiZer® Coil 22.1/11.8 23.7/11.0 23.7/11.0 15.1/22.5MCHX CONDENSER* Quantity 1 1 1 1 Total Face Area (sq ft) 32.9 32.9 32.9 32.9RTPF CONDENSER Quantity 1 1 1 1 Rows...Fins/in. 2...15 3...15 3...15 4...15 Total Face Area (sq ft) 33.3 33.3 33.3 33.3CONDENSER FAN Propeller Type Nominal Cfm 19,500 19,500 19,500 19,500 Quantity... Diameter (in.) 2 ... 30 2 ... 30 2 ... 30 2 ... 30 Motor Hp 1 1 1 1EVAPORATOR COIL Cross-Hatched Copper Tubes, Aluminum Plate Fins with Intertwined Circuits Tube Size (in.) 3/8 3/8 3/8 3/8 Rows ... Fins/in. 3 ... 15 4 ... 14 4 ... 15 4 ... 15 Total Face Area (sq ft) 31.7 31.7 31.7 31.7HUMIDI-MIZER COIL Quantity 1 1 1 1 Face Area (sq ft) 14.4 14.4 14.4 14.4EVAPORATOR FAN Centrifugal Type Quantity ... Size (in.) 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15 Type Drive Belt Belt Belt Belt Nominal Cfm 8,000 10,000 11,000 12,000 Motor Hp 5 10 15 5 10 15 10 15 20 10 15 20 Motor Frame Size 184T 215T 254T 184T 215T 254T 215T 254T 256T 215T 254T 256T Motor Bearing Type Ball Ball Ball Ball Maximum Allowable Rpm 1200 1200 1200 1200 Motor Pulley Pitch Diameter 4.8 4.4 5.7 5.2 6.1 5.5 4.4 4.9 5.9 4.4 5.7 5.9 Nominal Motor Shaft Diameter (in.) 11/8 13/8 15/8 11/8 13/8 15/8 13/8 15/8 15/8 13/8 15/8 15/8 Fan Pulley Pitch Diameter (in.) 12.4 8.6 9.1 12.4 11.1 8.7 9.4 8.1 8.7 9.0 9.1 8.7 Nominal Fan Shaft Diameter (in.) 115/16 115/16 115/16 115/16 Belt Quantity 1 2 2 1 1 2 2 2 2 2 2 2 Belt Type BX56 BX50 5VX530 BX56 5VX570 5VX530 BX50 5VX500 5VX530 BX50 5VX530 5VX530 Belt Length (in.) 56 63 53 56 57 53 50 50 53 50 53 53 Pulley Center Line Distance (in.) 16.0-18.7 15.6-18.4 15.0-17.9 15.6-18.4 15.6-18.4

15.0-17.9

15.6-18.4 15.0-17.9 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9

Factory Speed Setting (rpm) 717 924 1096 773 962 1106 848 1059 1187 856 1096 1187FURNACE SECTION Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max. Rollout Switch Cutout Temp (F)† 225 225 225 225 Burner Orifice Diameter (in. ...drill size) Natural Gas Std .111 ... 34 .111 ... 34 .111 ... 34 .111 ... 34 Liquid Propane Alt .089 ... 43 .089 ... 43 .089 ... 43 .089 ... 43 Thermostat Heat Anticipator Setting Stage 1 (amps) 0.1 0.1 0.1 0.1 Stage 2 (amps) 0.1 0.1 0.1 0.1 Gas Input (Btuh) Stage 1 (Low Heat/High Heat) 262,500/394,000 262,500/394,000 262,500/394,000 262,500/394,000

Stage 2 (Low Heat/High Heat) 350,000/525,000 350,000/525,000 350,000/525,000 350,000/525,000

Efficiency (Steady State) (%) 81 81 81 81 Temperature Rise Range (F) 15-45/35-65 15-45/35-65 15-45/35-65 15-45/35-65 Manifold Pressure (in. wg) Natural Gas Std 3.5 3.5 3.5 3.5 Liquid Propane Alt 3.5 3.5 3.5 3.5 Gas Valve Quantity 2 2 2 2HIGH-PRESSURE SWITCH (psig) Cutout 650 650 650 650 Reset (Auto.) 500 500 500 500MIXED-AIR FILTERS Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 Pleated 5 ... 20 x 20 x 4

5 ... 20 x 24 x 45 ... 20 x 20 x 45 ... 20 x 24 x 4

5 ... 20 x 20 x 45 ... 20 x 24 x 4

5 ... 20 x 20 x 45 ... 20 x 24 x 4

OUTDOOR-AIR FILTERS Quantity...Size (in.) 8...16 x 25 x 2

4...20 x 25 x 2

POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheelswith Backdraft Dampers on Each Fan Housing Motor, Quantity...Hp 4...1 Fan, Diameter...Width (in.) 11 x 10

Al — AluminumCu — CopperMCHX— Microchannel Heat ExchangerRTPF — Round Tube Plate Fin

18

Table 1 — Physical Data — 48A Units (cont)

LEGEND * Sizes 020 to 027: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper portion.Sizes 030 and 035: Circuit 1 uses the upper portion of condenser coil, Circuit 2 uses the lower portion.Sizes 040 and 050: Circuit 1 uses the left condenser coil, Circuit 2 the right.Size 060: Circuit A uses the two MCHX coils near the bulkhead, Circuit B uses thetwo MCHX coils near the control box.

† Rollout switch is manual reset.

UNIT 48A 035D/E 040D/E 050D/E 060D/ENOMINAL CAPACITY (tons) 35 40 50 60BASE UNIT See Unit Weights TableOPERATING WEIGHT (lb)COMPRESSOR Quantity ... Type (Ckt 1/Ckt 2) 2 ... ZP67/2...ZP104 2...ZP104/2...ZP104 2…ZP122/2…ZP122 2…ZP154/2…ZP154 Number of Refrigerant Circuits 2 2 2 2 Oil Precharged Precharged Precharged PrechargedREFRIGERANT R-410A Operating Charge (lb), Ckt 1/Ckt 2 RTPF Coils 28.7/44.0 44.0/44.0 56.3/57.3 78.5/82.0 MCHX Coils 17.9/26.0 23.0/23.5 27.0/28.0 36.6/37.8 MCHX Coils with Humidi-MiZer® Coil 17.9/31.5 23.0/30.5 26.5/34.5 36.6/47.6MCHX CONDENSER* Quantity 1 2 2 4 Total Face Area (sq ft) 32.9 65.8 65.8 105.2RTPF CONDENSER Quantity 1 2 2 2 Rows...Fins/in. 4...15 3...15 4...15 6...30 Total Face Area (sq ft) 33.3 66.7 66.7 100.0CONDENSER FAN Propeller Type Nominal Cfm 19,500 32,000 35,000 40,000

Quantity... Diameter (in.) 2 ... 30 4 ... 30 4 ... 30 4...30.5(MCHX), 6...30(RTPF) Motor Hp 1 1 1 1EVAPORATOR COIL Cross-Hatched Copper Tubes, Aluminum Plate Fins with Intertwined Circuits Tube Size (in.) 1/2 1/2 1/2 1/2 Rows ... Fins/in. 6 ... 16 4 ... 17 6 ... 16 4...17 Total Face Area (sq ft) 31.3 31.3 31.3 48.1HUMIDI-MIZER COIL Quantity 1 1 1 1 Face Area (sq ft) 14.4 14.4 14.4 14.1EVAPORATOR FAN Centrifugal Type Quantity ... Size (in.) 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15 3 ... 20 X 15 Type Drive Belt Belt Belt Belt Nominal Cfm 14,000 16,000 18,000 24,000 Motor Hp 15 20 25 15 20 25 20 25 30 25 30 40 Motor Frame Size 254T 256T 284T 254T 256T 284T 256T 284T 286T 284T 286T 324T Motor Bearing Type Ball Ball Ball Ball Maximum Allowable Rpm 1300 1300 1300 1200 Motor Pulley Pitch Diameter (in.) 5.1 5.7 6.2 5.3 5.7 7.5 5.7 6.2 6.7 5.3 5.9 6.5 Nominal Motor Shaft Diameter (in.) 15/8 15/8 17/8 15/8 15/8 17/8 15/8 17/8 17/8 17/8 17/8 21/8 Fan Pulley Pitch Diameter (in.) 8.7 8.7 8.7 9.5 9.5 11.1 9.5 9.5 9.5 9.1 9.5 9.5 Nominal Fan Shaft Diameter (in.) 115/16 115/16 115/16 115/16 Belt Quantity 2 2 2 2 2 2 2 2 2 3 3 3 Belt Type 5VX500 5VX530 5VX550 5VX530 5VX550 5VX590 5VX550 5VX570 5VX570 5VX530 5VX550 5VX570 Belt Length (in.) 50 53 55 53 55 59 55 57 57 53 55 57

Pulley Center Line Distance (in.) 15.0-17.915.0-17.9

15.0-17.9

15.0-17.9

15.0-17.9

14.6-17.6

15.0-17.9

14.6-17.6

14.6-17.6

15.2-17.5

14.7-17.2

14.2-17.0

Factory Speed Setting (rpm) 1025 1147 1247 976 1050 1182 1050 1142 1234 1019 1087 1197FURNACE SECTION Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max. Rollout Switch Cutout Temp (F)† 225 225 225 225 Burner Orifice Diameter (in ...drill size)

Natural Gas Std .111 ... 34 (low)/.120 ... 31 (high) .120 ... 31 .120 ... 31 .120...31

Liquid Propane Alt .089 ... 43 .096 ... 41 .096 ... 41 .096...41 Thermostat Heat Anticipator Setting Stage 1 (amps) 0.1 0.24 0.1 0.1 Stage 2 (amps) 0.1 0.13 0.1 0.1 Gas Input (Btuh) Stage 1 (Low Heat/High Heat) 262,500/600,000 300,000/600,000 300,000/600,000 582,000/873,000

Stage 2 (Low Heat/High Heat) 350,000/800,000 400,000/800,000 400,000/800,000 776,000/1,164,000

Efficiency (Steady State) (%) 81 81 81 81 Temperature Rise Range (F) 15-45/30-60 10-40/30-60 10-40/30-60 10-40/30-60 Manifold Pressure (in. wg) Natural Gas Std 3.5 3.5 3.5 3.3 Liquid Propane Alt 3.5 3.5 3.5 3.3 Gas Valve Quantity 2 2 2 3HIGH-PRESSURE SWITCH (psig) Cutout 650 650 650 650 Reset (Auto.) 500 500 500 500MIXED-AIR FILTERS Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 16...20 x 24 x 2

8...20 x 20 x 48...20 x 24 x 4

Pleated 5 ... 20 x 20 x 45 ... 20 x 24 x 4

5 ... 20 x 20 x 45 ... 20 x 24 x 4

5 ... 20 x 20 x 45 ... 20 x 24 x 4

OUTDOOR-AIR FILTERS

Quantity...Size (in.) 8...16 x 25 x 24...20 x 25 x 28...16 x 25 x 24...20 x 25 x 2

8...16 x 25 x 24...20 x 25 x 2

12...16 x 25 x 26...20 x 25 x 2

POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheelswith Backdraft Dampers on Each Fan Housing Motor, Quantity...Hp 4...1

11 x 104...1

11 x 104...1

11 x 106...1

11 x 10 Fan, Diameter...Width (in.)

Al — AluminumCu — CopperMCHX— Microchannel Heat ExchangerRTPF — Round Tube Plate Fin

19

Fig

. 14

— R

igg

ing

Info

rmat

ion

NO

TE:

Add

312

lbs

(142

kg)

for e

xpor

t cra

ting.

(027

-035

uni

ts)

Add

346

lbs

(157

kg)

for e

xpor

t cra

ting.

(040

-050

uni

ts)

Add

588

lbs

(266

kg)

for e

xpor

t cra

ting.

(060

uni

ts)

Add

the

wei

ghts

sho

wn

belo

w fo

r rou

nd tu

be p

late

fin

coils

50EJ

5003

05 R

EV 2

.0

Uni

t Siz

e ---

------

-02

703

0-03

504

005

006

0C

oppe

r Tub

e/A

lum

inum

Fin

Con

d C

oil

105

lbs

(48

kg)

160

lbs

(72

kg)

192

lbs

(87

kg)

317

lbs

(144

kg)

26 lb

s (1

2 kg

)C

oppe

r Tub

e/C

oppe

r Fin

Con

d.C

oil

268

lbs

(122

kg)

377

lbs

(171

kg)

518

lbs

(235

kg)

751

lbs

(341

kg)

677

lbs

(307

kg)

The w

eight

distrib

ution

and c

enter

of gr

avity

inform

ation

are r

epres

entat

ive of

a sta

ndard

unit a

nd in

clude

the i

mpac

t of fa

ctory

instal

led ec

onom

izer, l

arges

t IFM

motor

& VF

D, mo

dulat

ing po

wer e

xhau

st (bo

th fac

tory in

stalled

and f

ield in

stalled

optio

ns), a

nd el

ectric

heat

(on 50

A only

).

LBS

4854

4944

5024

4932

4984

5064

4834

4924

5004

4912

4964

5044

5121

5326

5486

5314

5366

5526

5559

5764

5924

5752

5804

5964

5744

5949

6109

5937

5989

6149

8311

8386

8626

8526

8426

8676

KG

S22

0222

4322

7922

3722

6122

9721

9322

3322

7022

2822

5222

8823

2324

1624

8924

1124

3425

0725

2126

1426

8726

0926

3327

0526

0626

9927

7126

9327

1727

8937

7038

0439

1338

6838

2239

36

INC

HES

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

87.7

87

.7

161.

716

1.7

161.

716

1.7

161.

716

1.7

MM

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

2227

4106

4106

4106

4106

4106

4106

INC

HES

97.2

96.1

95.6

93.6

92

.7

92.3

95

.294

.093

.691

.6

90.6

90

.3

95.9

94

.8

94.2

92

.7

91.7

91

.3

121.

8 12

0.3

118.

8 11

6.5

115.

1 11

3.9

119.

5 11

8.1

116.

6 11

4.3

112.

9 11

1.7

184.

917

7.6

170.

417

6.5

169.

616

3.3

MM

2469

2441

2428

2379

2354

2344

2417

2389

2376

2327

2302

2293

2436

2408

2394

2354

2329

2318

3094

3056

3018

2958

2924

2893

3035

2999

2962

2904

2868

2837

4698

4511

4329

4484

4309

4147

INC

HES

44.1

43.7

43.4

48.4

48.0

47.7

44.4

44.0

43.7

48.8

48.3

48.0

41.4

41.0

40.7

45.7

45.3

44.9 41 41 41 45.4

44.9

44.6 42 41 41 45.5

45.1

44.7 43 41 39 47.1

45.2

43.2

MM

1120

1110

1102

1230

1220

1211

1128

1118

1110

1238

1228

1219

1053

1042

1035

1162

1151

1141

1052

1041

1033

1152

1142

1132

1059

1048

1040

1156

1145

1135

1102

1049

996

1196

1149

1097

50A

2/A

3/A

6/A

7 02

748

A2/

A3/

A6/

A7D

027

48A

2/A

3/A

6/A

7E 0

2750

A4/

A5/

A8/

A9

027

48A

4/A

5/A

8/A

9D 0

2748

A4/

A5/

A8/

A9E

027

50A

2/A

3/A

6/A

7 03

048

A2/

A3/

A6/

A7D

030

48A

2/A

3/A

6/A

7E 0

3050

A4/

A5/

A8/

A9

030

48A

4/A

5/A

8/A

9D 0

3048

A4/

A5/

A8/

A9E

030

50A

2/A

3/A

6/A

7 03

548

A2/

A3/

A6/

A7D

035

48A

2/A

3/A

6/A

7E 0

3550

A4/

A5/

A8/

A9

035

48A

4/A

5/A

8/A

9D 0

3548

A4/

A5/

A8/

A9E

035

50A

2/A

3/A

6/A

7 04

048

A2/

A3/

A6/

A7D

040

48A

2/A

3/A

6/A

7E 0

4050

A4/

A5/

A8/

A9

040

48A

4/A

5/A

8/A

9D 0

4048

A4/

A5/

A8/

A9E

040

50A

2/A

3/A

6/A

7 05

048

A2/

A3/

A6/

A7D

050

48A

2/A

3/A

6/A

7E 0

5050

A4/

A5/

A8/

A9

050

48A

4/A

5/A

8/A

9D 0

5048

A4/

A5/

A8/

A9E

050

50A

2/A

3/A

6/A

7 06

048

A2/

A3/

A6/

A7D

060

48A

2/A

3/A

6/A

7E 0

6050

A4/

A5/

A8/

A9

060

48A

4/A

5/A

8/A

9D 0

6048

A4/

A5/

A8/

A9E

060

MO

DEL

BC

WEI

GH

TA

20

Table 2 — Unit Operating Weights* (lb)

Table 3 — Option and Accessory Weights (lb)

Table 4 — Constant Volume FanMotor Weights (lb)

Table 5 — Variable Air Volume / Staged Air Volume Fan Motor Weights (lb)

LEGEND AND NOTES FOR TABLES 2-5

LEGEND *Outdoor-air hoods and filters included in base unit weights; indoor-fan motors are NOT included.NOTES:1. Base unit weight includes OA hoods (economizer or outdoor air

damper); does not include an indoor-fan motor. ADD indoormotor, FIOPs and accessories for TOTAL operating weight.

2. VAV/SAV™ motor weights include the indoor motor and the VFD,optional VFD bypass, VFD transducer, and associated wiring.

UNIT SIZE 020 025 027 030 035 040 050 06048A2D,A3D,A6D,A7D 3825 3961 3961 3992 4340 4770 4914 706648A2E,A3E,A6E,A7E 3905 4041 4041 4072 4500 4930 5074 730648A4D,A5D,A8D,A9D 3865 4001 4001 4032 4380 4810 4954 710648A4E,A5E,A8E,A9E 3945 4081 4081 4112 4540 4970 5114 7356

UNIT SIZE 020 025 027 030 035 040 050 060OPTIONS/ACCESSORIES (WEIGHT ADDERS) (lb)

Barometric Relief 300 300 300 300 300 300 300 450Non-Modulating Power Exhaust 450 450 450 450 450 450 450 675Modulating Power Exhaust 500 500 500 500 500 500 500 725Electric Heat 110 110 110 110 110 110 110 165Cu Tube/Aluminum Fin Condenser Coil 100 100 100 150 150 187 317 26Cu Tube/Cu Fin Condenser Coil 263 263 263 370 370 512 751 677

OA Hood Crate/Packaging(Less Hoods’ Weight)

45 45 45 45 45 45 45 45(Packaging Only)

Outdoor Air Hoods/Filters (included with unit) 170 170 170 170 170 170 170 255Hail Guards 73 73 73 73 73 146 146 219Roof Curb (14-in.) 365 365 365 365 365 410 410 540Double Wall 275 275 275 275 275 275 275 375Humidi-MiZer® Coil 150 150 150 150 150 180 180 195

MOTOR HP UNIT VOLTAGEPREMIUM

EFFICIENCYIFM

5 HP230/460 80

380 75575 80

10 HP230/460 126

380 120575 126

15 HP230/460 217

380 155575 217

20 HP230/460 250

380 185575 250

25 HP230/460 309

380 225575 309

30 HP230/460 303

380 283575 303

40 HP230/460 551

380 601575 551

MOTOR HP UNIT VOLTAGEPREMIUM

EFFICIENCYIFM

5 HP230/460 138

380 133575 149

10 HP230/460 195

380 198575 195

15 HP230/460 316

380 254575 319

20 HP230/460 385

380 320575 357

25 HP230/460 444

380 360575 454

30 HP230/460 338

380 318575 342

40 HP230/460 686

380 736575 686

Cu — CopperFIOP — Factory-Installed OptionHP — HorsepowerIFM — Indoor-Fan MotorOA — Outdoor AirSAV — Staged Air VolumeVAV — Variable Air VolumeVFD — Variable Frequency Drive

21

Table 6 — Evaporator Fan Motor Data

NOTES:1. Motor shaft speed is 1750 rpm. The fan shaft diameter is 115/16 inches.2. All indoor fan motors meet the minimum efficiency requirements as established

by the Energy Policy Act of 1992 (EPACT), effective October 24, 1997.

Step 3 — Field Fabricate Ductwork — Secure allducts to building structure. Use flexible duct connectors betweenunit and ducts as required. Insulate and weatherproof all externalductwork, joints, and roof openings with counter flashing andmastic in accordance with applicable codes.NOTE: Due to width of the horizontal supply and returnductwork, provisions should be made for servicing of the outdoorair filters (i.e., catwalk over ductwork).

Ducts passing through an unconditioned space must be insulat-ed and covered with a vapor barrier. Outlet grilles must not lie di-rectly below unit discharge. The return duct must have a 90-de-gree elbow before opening into the building space if the unit isequipped with power exhaust.

To attach ductwork to roof curb, insert duct approximately 10to 11 in. up into roof curb. Connect ductwork to 14-gage roof curbmaterial with sheet metal screws driven from inside the duct.

Follow AMCA (Air Movement and Control Association)guidelines relating to ductwork connections to the unit. Theseguidelines recommend a minimum 21/2 equivalent duct diame-ters of straight duct connected to supply air inlet and outletopenings before any transitions, fittings, dampers, etc. Failureto adhere to these guidelines may result in system effectswhich can impact the unit’s ability to achieve published perfor-mance.

Step 4 — Make Unit Duct Connections48A2, A3, A6, AND A7 UNITS — Unit is shipped for thru-the-bottom duct connections. Field-fabricated ductwork should beattached to the roof curb. Supply and return duct dimensionsare shown in Fig. 5, 6, 9, and 12. Air distribution is shown in

Fig. 15. Refer to installation instructions shipped with roof curbfor more information.

48A4, A5, A8, AND A9 UNITS — Remove shipping coversfrom supply and return air openings. Attach field-suppliedductwork to unit. Connect to the unit with a single duct for all sup-ply openings and with a single duct for all return openings. Split-ting of the airflow into branch ducts should not be done at the unit.Sufficient duct length should be used prior to branching to ensurethe air temperatures are well mixed within the ductwork. SeeFig. 7, 8, 10, and 11 for duct opening dimensions. Secure all ductsto building structure. Air distribution is shown in Fig. 16. Verifythe Outdoor Air Temperature (OAT) and Return Air Temperature(RAT) sensors as outlined in Fig. 17 can measure the OAT andRAT temperature sensors in the corresponding air streams. Relo-cate the sensor locations if needed.Install accessory barometric relief or power exhaust in the field-fabricated return ductwork. Refer to Step 11 — Position PowerExhaust/Barometric Relief Damper Hood section on page 30 formore information.

UNITSIZE48A

MOTORHP

MOTORSHAFT DIA.

(in.)

FANSHAFTSPEED(RPM)

MOTORSHEAVE

(P/N)

MOTORSHEAVE

PITCHDIAMETER

(in.)

BUSHINGDIAMETER

(in.)

FANSHEAVE

(P/N)

FANSHEAVE

PITCHDIAMETER

(in.)

BUSHINGDIAMETER

(in.)

BELT(QUANTITY)

(P/N)

BELTTENSION

(lb at .25 in.)

0205 1.125 717 BK55 4.8 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 8

10 1.375 924 2BK50 4.4 NONE - 1.375 2B5V86 8.6 B - 1.9375 (2) BX50 815 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 9

0255 1.125 773 BK55 5.2 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 8

10 1.375 962 1B5V60 6.1 H - 1.375 1B5V110 11.1 B - 1.9375 5VX570 1115 1.625 1106 2B5V54 5.5 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 9

02710 1.375 848 2BK50 4.4 NONE - 1.375 2B5V94 9.4 B - 1.9375 (2) BX50 815 1.625 1059 2B5V56 4.9 B - 1.625 2B5V90 8.1 B - 1.9375 (2) 5VX530 1020 1.625 1187 2B5V58 5.9 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 11

03010 1.375 856 2BK50 4.4 H - 1.375 2B5V94 9.0 B - 1.9375 (2) BX50 815 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 920 1.625 1187 2B5V58 5.9 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 11

03515 1.625 1025 2B5V50 5.1 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX500 920 1.625 1147 2B5V56 5.7 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 1025 1.875 1247 2B5V62 6.2 B - 1.875 2B5V86 8.7 B - 1.9375 (2) 5VX530 11




WARNING

For vertical supply and return units, tools or parts coulddrop into ductwork and cause an injury. Install a 90-degreeelbow turn in the supply and return ductwork between theunit and the conditioned space. If a 90-degree elbow cannotbe installed, then a grille of sufficient strength and densityshould be installed to prevent objects from falling into theconditioned space.

Fig. 15 — Air Distribution — Thru-the-Bottom

a48-8241

22

Fig. 17 — Outdoor Air and Return Air Sensors Location

Step 5 — Install Flue Hood48A2020-050 UNITS — Flue hood is shipped inside gas sec-tion of unit. To install, secure flue hood to access panel. SeeFig. 18.48A2060 UNITS — Flue hood and wind baffle are shippedinside gas section of unit. To install, secure flue hood to accesspanel. Install the two pieces of the wind baffle over the fluehood. See Fig. 19.NOTE: When properly installed, flue hood will line up withcombustion fan housing. See Fig. 20.

Step 6 — Trap Condensate Drain — See Fig. 5-12for drain location. Condensate drain is open to atmosphere andmust be trapped. Install a trapped drain at the drain location.One 1-in. female coupling is provided inside the unit evapora-tor section for condensate drain connection. A trap at least 4 in.deep must be used. See Fig. 21. Trap must be installed to pre-vent freeze-up.Condensate pans are sloped so that water will completely drainfrom the condensate pan to comply with indoor air qualityguidelines. The condensate drain pans are not insulated.

Fig. 16 — Air Distribution — Thru-the-Side

a48-8242

Fig. 18 — Flue Hood Location(48A020-050 Units)

a48-3712

Fig. 19 — Flue Hood Location(48A2,A3,A4,A5060 Units)

a48-4076

FLUE HOOD

GAS SECTIONACCESS PANEL

WINDBAFFLE

TOP VIEW SIDE VIEW

Fig. 20 — Combustion Fan Housing Location(48A020-050 Shown)

a48-3823

23

Step 7 — Install Gas Piping — Unit is equipped foruse with natural gas. Installation must conform with localbuilding codes or, in the absence of local codes, with the Na-tional Fuel Gas Code, ANSI Z223.1.Install manual gas shutoff valve with a 1/8-in. NPT pressure tapfor test gage connection at unit. Field gas piping must includesediment trap and union. See Fig. 22. A 1/8-in. NPT is alsolocated on the gas manifold adjacent to the gas valve.

Size gas-supply piping for 0.5-in. wg maximum pressure drop.Do not use supply pipe smaller than unit gas connection.OPTIONAL STAGED GAS UNITS — See Table 7 for stagedgas information. Staging pattern is selected during controlsstart-up.For complete information and service instructions for stagedgas control units, see Controls, Start-Up, Operation, Serviceand Troubleshooting literature.

Table 7 — 48A Series Staged Gas Control

Step 8 — Install Supply-Air Thermistors(Staged and Modulating Gas Units Only) —Supply-air thermistors are a field-installed, factory-providedcomponent. Three supply-air thermistors are shipped withstaged and modulating gas units inside the unit control box.Thermistor wires must be connected to the SGC (staged gascontroller) in the unit control box. See Table 8. The supply-airthermistors should be located in the supply duct with the fol-lowing criteria:• downstream of the heat exchanger cells• equally spaced as far as possible from the heat

exchanger cells • a duct location where none of the supply air thermistors

are within sight of the heat exchanger cells• a duct location with good mixed supply air portion of the

unit.

Table 8 — SGC Thermistor Designations

SGC — Staged Gas Controller

WARNING

Do not pressure test gas supply while connected to unit.Always disconnect union before servicing. Personal injuryor damage to unit may occur.

IMPORTANT: Natural gas pressure at unit gas connectionmust not be less than 5 in. wg or greater than 13.5 in. wg.

Fig. 21 — Condensate Drain Trap Piping Details(Typical Roof Curb or Slab Mount Shown)

a48-3714

NUMBER OFSTAGES

MODEL NUMBER POSITIONHEAT SIZE

5 6,7,8

5 STAGES

S

020025027030035040050

Low

T035040050

High

7 STAGES T

020025027030

High

9 STAGES T 060 High11 STAGES S 060 Low

Fig. 22 — Field Gas Piping

a48-2524

THERMISTORPIN

CONNECTIONPOINT

FUNCTION AND LOCATIONPART NO.

Thermistors

SAT1 J8 – 1,2 (SGC) Supply-Air Thermistor (SAT) — Inserted into supply section underneath the gas heat section (factory-provided, field-installed)

HH79NZ034SAT2 J8 – 3,4 (SGC) Supply-Air Thermistor (SAT) — Inserted into supply section underneath the gas heat section (factory-provided, field-installed)

SAT3 J8 – 5,6 (SGC) Supply-Air Thermistor (SAT) — Inserted into supply section underneath the gas heat section (factory-provided, field-installed)

LIMTTEMP J8 – 15,16 (SGC)Limit Switch Thermistor (LIMTTEMP) — Inserted next to the lower limit switch (factory-installed)

24

Step 9 — Make Electrical ConnectionsPOWER WIRING — Units are factory wired for the voltageshown on the unit nameplate.Provide a unit safety disconnect switch in the main power supplyto each unit (see Fig. 23). Select switch size and mounting loca-tion in accordance with applicable local codes or National Electri-cal Code (NEC). If combining the functions of safety disconnectwith maximum overcurrent protection (MOCP) fuses (“fused dis-connect”), coordinate safety switch size with MOCP size data asmarked on unit informative plate.Unit may be equipped with optional factory-installed non-fuseddisconnect switch (see Fig. 23). Provide maximum overcurrentprotection devices (fuses or HACR breakers, per local codes) inbranch circuit wiring remote from unit. Observe requirements ofNEC Article 440. Install service switch upstream of remote fusesif required.The main power terminal block is suitable for use with aluminumor copper wire. See Fig. 23. Units have circuit breakers for com-pressors, fan motors, and control circuit. The unit must be electri-cally grounded in accordance with local codes or, in absence oflocal codes, with NEC, ANSI C1-latest year.FIELD POWER SUPPLY — Unit is factory wired for voltageshown on unit nameplate. Field wiring can be brought into the unit from bottom (throughbasepan and roof curb) or through side of unit (corner post next tocontrol box).A 31/2-in. NPT coupling for field power wiring and a 3/4-in.NPT coupling for 24-v control wiring are provided in basepan.In the side post, there are two 21/2-in. (sizes 020-035) or 3-in.(sizes 040-060) knockouts for the field power wiring. SeeFig. 5-12. If control wiring is to be brought in through side ofunit, a 7/8-in. diameter hole is provided in the condenser sidepost next to the control box.Do not route control wiring in the same conduit as power wiring.If disconnect box is mounted to corner post, be careful not to drillor screw into the condenser coil.

Routing Through Bottom of Unit — If wiring is brought inthrough bottom of unit, use field-supplied watertight conduit toroute power wiring through the 31/2-in. diameter hole provided inthe unit basepan.Install conduit connector in unit basepan as shown in Fig. 5-12.Route power and ground lines through connector to terminal con-nections in unit control box as shown on unit wiring diagram andFig. 23.Use strain relief going into control box through 35/8-in. diameterhole provided. After wires are in unit control box, connect topower terminal block (see Power Wiring section).Low-voltage wiring must be run in watertight conduit from thebasepan to control box and through 7/8-in. diameter hole providedin bottom of unit control box. Field-supplied strain relief must beused going into the box. After wiring is in control box, make con-nections to proper terminals on terminal blocks (see Field ControlWiring section).Routing Through Side of Unit — Route power wiring in field-supplied watertight conduit into unit through 21/2-in. (sizes 020-035) or 3-in. (sizes 040-060) hole. Use field-supplied strain relief going into control box through 35⁄8-in. diameter hole provided. After wires are in unit control box,connect to power terminal block (see Power Wiring section).Bring low-voltage control wiring through the 7/8-in. diameter holeprovided in the condenser section side post. Use strain relief goinginto 7/8-in. diameter hole in bottom of unit control box.After wiring is in control box, make connection to proper termi-nals on terminal blocks (see Field Control Wiring section).

Affix crankcase heater sticker (located in the installer’s packet) tounit disconnect switch.Voltage to compressor terminals during compressor operationmust be within the voltage range indicated on the unit nameplate.Phases must be balanced within 2%.Use the following formula to determine the percent of voltageimbalance.

% Voltage Imbalance:

Example: Supply voltage is 230-3-60

Determine maximum deviation from average voltage.(AB) 227-224 = 3 v(BC) 231-227 = 4 v(AC) 227-226 = 1 vMaximum deviation is 4 v.Determine percent of voltage imbalance.

LEGENDGND — GroundNEC — National Electrical CodeTB — Terminal Block

Fig. 23 — Field Power Wiring Connections

a48-6977

FIE

LD S

UP

PLI

ED

DIS

CO

NN

EC

T P

ER

NE

C

FIELD

POWER

SUPPLY

11 21

22

2313

12

TB1

EQUIP GND

FIE

LD P

OW

ER

WIR

ING

11 21

22

2313

12

GND

OPTIONALFACTORY-INSTALLED

DISCONNECT

FIELD-INSTALLED DISCONNECT

FACTORY-INSTALLED DISCONNECT

IMPORTANT: The VAV (variable air volume) units use vari-able frequency drives, which generate and can radiate radiofrequency energy. If units are not installed and used in accor-dance with these instructions, they may cause radio interfer-ence. They have been tested and found to comply with limitsof a Class A computing device pursuant to International Stan-dard in North American EN 61000-2/3, which are designed toprovide reasonable protection against such interference whenoperated in a commercial environment.

WARNING

The unit must be electrically grounded in accordance withlocal codes and NEC ANSI/NFPA 70 (National Fire Protec-tion Association). Personal injury may result.

= 100 xmax voltage deviation from average voltage

average voltage

AB = 224 v

BC = 231 v

AC = 226 v

Average Voltage =(224 + 231 + 226)

=681

= 2273 3

A B C

MOTOR

25

This amount of phase imbalance is satisfactory as it is below the maxi-mum allowable 2%.

NOTE: Check all factory and field electrical connections for tightness.

Unit failure as a result of operation on improper line voltage orexcessive phase imbalance constitutes abuse and may cause dam-age to electrical components.On 208/230-v units, transformers 1-5 are wired for 230-v. If 208/230-v unit is to be run with 208-v power supply, the transformersmust be rewired as follows:For transformer 1 move the black wire connected to terminal H2and connect it to terminal H3.For transformer

Documents

Installation Instructions - Carrier · 2020. 7. 30. · Acoustic Insulation • Provide acoustic interior lining for first 20 ft of supply and return duct or until the first elbow