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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 D´INCENDIE OU D´EXPLOSIONSi 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 d´essence 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 d´un voisin. Suivre lesinstructions du fournisseur de gaz.
• Si le fournisseur de gaz n´est pas accessible, appeler leservice d´incendie.
L´installation et l´entretien doivent être effectués par uninstallateur ou une entreprise d´entretien 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
04015 1.625 976 2B5V52 5.3 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX530 1020 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 1125 1.875 1182 2B5V74 7.5 B - 1.875 2B5V110 11.1 B - 1.9375 (2) 5VX590 11
05020 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 1025 1.875 1142 2B5V62 6.2 B - 1.875 2B5V94 9.5 B - 1.9375 (2) 5VX570 1130 1.875 1234 2B5V66 6.7 B - 1.875 2B5V94 9.5 B - 1.9375 (2) 5VX570 13
06025 1.875 1019 3B5V52 5.3 B - 1.875 3B5V90 9.1 B - 1.9375 (3) 5VX530 1230 1.875 1086 3B5V58 5.9 B - 1.875 3B5V94 9.5 B - 1.9375 (3) 5VX550 1240 2.125 1197 3B5V64 6.5 B - 2.125 3B5V94 9.5 B - 1.9375 (3) 5VX570 14
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
Recommended