TABLE OF CONTENTS

Specifications and Dimensions....................................................2Installation of Components..........................................................3Preliminary Circuit Analysis..........................................................3Field Service Checklist.................................................................4Performance Check.......................................................................5Extended High-Fire Ignition..........................................................5Wiring Diagrams............................................................................6Valve Adjustments.........................................................................7

1© 2010 Maxitrol Company, All Rights Reserved

SERIES 21 Amplifiers (A1010U Shown):

A1010UAD1010U - integral temp. selector

For included selectable tempera-ture ranges, see pg. 5.

Modulator-Regulator Valves:

MR410 - (3/8” and 1/2” pipe sizes)MR510 - (1/2” and 3/4” pipe sizes)MR610 - (3/4” and 1” pipe sizes)

Remote Temperature Selectors:TD121 - (55º to 90ºF)TD121A - (80º to 130ºF)TD121B - (120º to 170ºF)TD121C - (160º to 210ºF)TD121D - (200º to 250ºF)TD121E - (100º to 250ºF)TD121F - (40º to 80ºF)NOTE: Remote Selector and Discharge Temperature Sensor must have same tem-perature range to be compatible. Optional: ETD-1 enclosure, EFP-1 cover plate only - no enclosure

Discharge Temperature Sensors: use with Mixing TubeTS121 - (55º to 90ºF)TS121A - (80º to 130ºF)TS121B - (120º to 170ºF)TS121C - (160º to 210ºF)TS121D - (200º to 250ºF)TS121E - (100º to 250ºF)TS121F - (40º to 80ºF)

Mixing Tubes: use with Sensors

MT1-9 or MT2-9 (9” length)MT1-12 or MT2-12 (12” length)MT1-23 or MT2-23 (23” length)MT1-28 or MT2-28 (28” length)MT1-57 (57” length)

OPTIONAL: Inlet Air Sensors - use with Mixing Tube

TS10765A - (8:1 ratio)TS10765B - (5:1 ratio)TS10765C - (3:5:1 ratio)

OPTIONAL: Override Stat - use with TD121 only

T115 - (40º to 90ºF)

Series 21 Installation InstructionsInstallation Instructions and field service checklist

DESCRIPTION

Selectra® SERIES 21 electronic gas flame modulation systems are designed primarily for make-up air heating, as components of indirect fired units with atmospheric burners. All fuel gases are compatible.

The SERIES 21 is designed for single or multiple furnace opera-tion. It is capable of controlling up to four furnaces. It may be field installed on existing equipment or specified for new equipment installation.

The systems utilize Modulator-Regulator valves. Amplifiers are available with integral or remote temperature selection. High Fire ignition selection (0, 5 or 25 second) is standard on all models. A discharge air temperature sensor is mounted within a mixing tube housing. Optionally, a room override thermostat when used in conjunction with the remote temperature selector provides space temperature control by raising the discharge air tempera-ture to a pre-selected point.

Also optional, an inlet air sensor (and mixing tube) provides inverse change in discharge air for each degree change in inlet air - when installed in a convenient duct location upstream of the burner.

Read these instructions carefully. Failure to follow them could result in a fire or explosion causing property damage, personal injury, or loss of life. The product must be installed and oper-ated according to all local regulations.

Service and or installation must be performed by a trained, ex-perienced service technician.

SYSTEM COMPONENTS

SPECIFICATIONS

Power Requirements:Single Furnace.....24V AC, 40VA capacityMultiple Furnace.....24V AC, 100VA capacity

Temperature Control Range:Standard.....55º to 90ºFOptional ranges to.....250ºF

Ambient Limits: -30º to 125ºF / -34º to 52ºC

2© 2010 Maxitrol Company, All Rights Reserved

T115

3.00

Mounting Holes

6.002.00

3.38A1010UAD1010U

TD121

T115

MIXING TUBES

A1010U / AD1010U

DIMENSIONS

NOTICE

Transformer secondary must not be grounded in any por-tion of the circuit external to a Maxitrol amplifier. If exist-ing transformer is grounded, a seperate isolated trans-former must be used. Electrical interference may effect performance and/or damage equipment.

Gases: Suitable for natural, manufactured, mixed gases, lique-fied petroleum gases, and LP gas-air mixtures.

Pressure Limits:Inlet (maximum) : MR410, 510, 610.....1 psi / 69 mbar

Outlet (maximum fire)standard spring*.....3.0” to 5.0” w.c. / 7 to 12 mbarH - models..... 7.5” to 12” w.c. / 19 to 30 mbarMax. set point not to exceed 10” w.c. above min. set point

Outlet (minimum fire)MR*10B10L standard spring*.....0.2” to 1.2” w.c. / .5 to 3 mbarMR*10B10L-1 spring*.....1” to 2.8” w.c. / 2.5 to 7 mbar(*other spring ranges available - Consult Maxitrol Company.)

Power LED

Relay LED

Valve LED

INSTALLATION OF COMPONENTS

Amplifier: Slide or snap out circuit board from amplifier base. Mount base with two screws in chosen location protected from weather or contaminated atmosphere. Amplifier is ready for wir-ing when circuit board is replaced on base - protective cover need not be removed.

Discharge Temperature Sensor (in Mixing Tube): Cut hole in air duct - install several feet from heat exchanger to avoid thermal radiation effects. Locate in discharge air stream. Remove cover and wire as shown in appropriate diagram, page 6 - reassemble.

Remote Selector: Install in control cabinet or other chosen location. Remove cover and wire as shown in appropriate diagram, page 6 - reassemble.

Room Override Thermostat: Place in heated area to sense average room temperature, not in direct path of discharge air stream. Use only with TD121 Remote Temperature Selector. Wire as shown in appropriate diagram, page 6.

NOTE: For systems using up to four automatic gas valves with 0.8 amp maximum current each, a 100VA transformer will be adequate.

In the event that an automatic valve(s) current exceeds 0.8 amps, it would be advisable to wire according to the ‘Independent Pow-er Supply’ diagram, page 6. The transformer for the modulating power - terminals 8 and 9 - should be 40VA, and the automatic valve transformer should be capable of handling required loads up to 3.5 amps maximum. If exceeding 3.5 amps, it will be neces-sary to operate an auxiliary relay with contact rating sufficient to handle the automatic valves and any accessories.

If diaphragm type automatic gas valve is used with seperate regulator, install MR valve downstream from diaphragm gas valve. Retain regulator in manifold and adjust 2 or 3 turns to compensate for pressure drop of MR valve.

If full combination control is used, install MR valve downstream. Adjust regula-tor in combination control 2 or 3 turns to compensate for pressure drop at MR valve.

If solenoid type automatic gas valve is used with seperate regulator, replace regulator with the MR valve.

3© 2010 Maxitrol Company, All Rights Reserved

In order to diagnose the cause of problems in this system it is necessary to determine certain values. It is helpful to have an AC and DC voltmeter and an ohmmeter capable of reading 0 to 15,000 ohms. For ease in trouble shooting, it is necessary to rewire the system, replacing the discharge air sensor with a 4500 ohms, eg. 4300 ohm + 200 ohm, 1/2 watt test resistors in series.

Modulating Function Test:Connect a DC voltmeter to amplifier terminals 1 and 2. If more convenient, the meter may be attached to the MR valve terminals. Rotate temperature selection knob to maximum setting. The DC Valve LED is “OFF”. The voltage should gradually increase to at least 20 volts when the temperature selector is slowly rotated to its minimum (generally over 3º to 4º range). Valve LED is “ON”. See “Valve LED” below.

Automatic Valve Function:Disconnect the wires at amplifier terminals 10 and 11, and con-nect an ohmmeter. Rotate temperature selector to maximum set-ting - ohmmeter should show continuity, Relay LED is “ON”. Ro-tate temperature selector to minimum setting - ohmmeter should show open circuit, Relay LED is “OFF”. Reconnect the wires to terminals 10 and 11.

If the voltage and continuity check are observed as noted, it is proved that the amplifier and temperature selector are operating properly.

After testing, remove the resistor and reconnect the discharge air sensor.

PRELIMINARY CIRCUIT ANALYSIS

GAS TRAINS

Valve: The MR valve must be in upright position, in a horizontal run of pipe only, with pilot gas supply upstream.

NOTICE

Wiring Run: Control wires connected to the Override Stat, Discharge Air Sensor, or Remote Temperature Selector must not be run close to or inside conduit with power or ignition wires. Doing so may cause the unit to function erratically or may destroy the amplifier. If shielded wires are used, shield must be insulated and grounded at the amplifier location only.

VALVE LEDThe PCB “Valve” LED illuminates when the output DC voltage to the valve is approximately 2 VDC or greater. It does not indicate valve positioning or whether the system is in modulation mode.

The Valve LED will be:• “OFF” at maximum high fire (0VDC) and during the high fire ignition duration (if used)• “ON” when PCB “Relay” LED is “OFF”• “ON” or “OFF” when the “Relay” LED is “ON”

SYM

PTO

MPO

SSIB

LE C

AU

SEFI

ELD

TES

TR

EMED

YA

.A

utom

atic

con

trol

val

ve w

ill

not c

lose

des

pite

full

rang

e of

mod

ulat

ing

volta

ge a

t te

rmin

als

1 an

d 2.

1. A

utom

atic

con

trol v

alve

not

ope

ratin

g pr

oper

ly.

2. I

nsta

llatio

n w

iring

err

or.

3. A

mpl

ifier

is n

ot o

pera

ting

prop

erly.

1. R

emov

e w

ire fr

om v

alve

, if v

alve

doe

s no

t clo

se -

valv

e is

not

ope

ratin

g pr

oper

ly.

2. R

emov

e w

ire fr

om a

mpl

ifier

term

inal

10

or 1

1. If

val

ve re

mai

ns o

pen,

che

ck fo

r mis

wiri

ng.

3. I

f AC

vol

tage

will

not

dro

p to

zer

o at

term

inal

s 8

and

11 -

whe

n D

C v

olta

ge a

t ter

min

als

1

and

2 is

abo

ve 2

0 V

DC

- am

plifi

er is

faul

ty. I

f spa

ce te

mpe

ratu

re is

less

than

60º

or

g

reat

er th

an 8

5ºF

(<16

º or >

29º

C),

see

Pre

limin

ary

Circ

uit A

naly

sis,

pag

e 3.

1. R

epla

ce a

utom

atic

con

trol v

alve

.

2. C

orre

ct w

iring

.

3. R

epla

ce a

mpl

ifier

.

B.

Aut

omat

ic c

ontr

ol v

alve

w

on’t

open

des

pite

full

rang

e of

mod

ulat

ing

volta

ge a

t te

rmin

als

1 an

d 2.

4. A

utom

atic

con

trol v

alve

not

ope

ratin

g pr

oper

ly.

5. O

pen

wire

to a

utom

atic

val

ve.

6. A

mpl

ifier

is n

ot o

pera

ting

prop

erly.

4. R

ead

volta

ge a

cros

s va

lve

term

inal

s. If

24

VAC

, val

ve is

not

ope

ratin

g pr

oper

ly.

5. R

ead

volta

ge a

cros

s te

rmin

als

8 an

d 11

on

ampl

ifier

. If 2

4 VA

C, c

heck

for o

pen

circ

uit t

o

a

utom

atic

val

ve. I

f spa

ce te

mpe

ratu

re is

less

than

60º

or g

reat

er th

an 8

5ºF

(<16

º or

>

29ºC

), se

e P

relim

inar

y C

ircui

t Ana

lysi

s, p

age

3.

6. I

f AC

vol

tage

read

ing

rem

ains

zer

o - w

hen

DC

vol

tage

at t

erm

inal

s 1

and

2 is

bel

ow 1

4

V D

C -

ampl

ifier

is fa

ulty

. If s

pace

tem

pera

ture

is le

ss th

an 6

0º o

r gre

ater

than

85º

F (<

16º

>

29º

C),

see

Pre

limin

ary

Circ

uit A

naly

sis,

pag

e 3.

4. R

epla

ce a

utom

atic

con

trol v

alve

.

5. C

orre

ct w

iring

6. R

epla

ce a

mpl

ifier

.

C.

No

gas

flow

.7.

Mal

func

tioni

ng p

ower

sup

ply.

8. M

R v

alve

inst

alle

d ba

ckw

ards

.9.

R55

cut

or m

issi

ng.

7. R

ead

volta

ge a

t am

plifi

er te

rmin

als

8 an

d 11

(24

VAC

).

8. A

rrow

s on

MR

val

ve s

houl

d po

int i

n th

e di

rect

ion

of g

as fl

ow.

9. R

55 s

houl

d be

inst

alle

d at

term

inal

s 5

& 7

(zer

o oh

m re

sist

or).

7. P

ower

sup

ply

mus

t be

24 V

AC

.

8. I

nsta

ll pr

oper

ly.9.

Ins

tall

jum

per b

etw

een

term

inal

s 5

& 7

.

D.

Con

tinuo

us h

igh

fire.

10. O

pen

circ

uit i

n se

nsin

g an

d se

tting

ci

rcui

t.10

. D

isco

nnec

t and

mea

sure

acr

oss

wire

s co

nnec

ted

to a

mpl

ifier

term

inal

s 3

and

4

(A

1010

U m

odel

s). S

houl

d re

ad b

etw

een

8,00

0 to

12,

000

ohm

s.10

. If

abov

e 12

,000

ohm

s, c

heck

circ

uit f

or o

pen

or

loos

e w

ires.

E.C

ontin

uous

hig

h fir

e bu

t au

tom

atic

val

ve c

ycle

s.11

. O

pen

circ

uit i

n w

iring

to M

R v

alve

.

12.

Plu

nger

jam

med

or i

nsta

lled

upsi

de

dow

n.

13.

MR

val

ve n

ot o

pera

ting

prop

erly.

11.

Che

ck w

iring

for d

efec

ts.

12.

Exa

min

e. P

lung

er s

houl

d be

sm

ooth

and

cle

an a

nd o

pera

te fr

eely

in s

olen

oid

slee

ve.

Mus

t be

inst

alle

d as

sho

wn

in “V

alve

Adj

ustm

ents

” pg.

7, “

M/M

R V

alve

Dia

gram

”.

13.

Mea

sure

vol

tage

acr

oss

MR

val

ve.

11.

Rep

ace

wiri

ng if

nec

essa

ry.

12.

Cle

an p

lung

er if

nec

essa

ry.

13.

If m

odul

atin

g vo

ltage

s ar

e ob

tain

ed b

ut n

o ga

s

m

odul

atio

n, M

R v

alve

is fa

ulty

. Rep

lace

if n

eces

sary

.

F.Fu

rnac

e w

on’t

activ

ate

due

to c

onst

ant h

igh

mod

ulat

ing

volta

ge. (

abov

e 17

V D

C)

14.

Sho

rt ci

rcui

t in

sens

ing

and

setti

ng

circ

uit.

14.

Dis

conn

ect a

nd m

easu

re a

cros

s w

ires

conn

ecte

d to

am

plifi

er te

rmin

als

3 an

d 4

(A10

10

mod

els)

. Sho

uld

read

bet

wee

n 8,

000

and

12,0

00 o

hms.

14.

If be

low

8,0

00 o

hms,

che

ck c

ircui

t for

sho

rts o

r \

m

isw

iring

.

G.

Con

tinuo

us lo

w o

r med

ium

fir

e, b

ut a

utom

atic

val

ve

cycl

es c

orre

ctly

.

15.

Hea

t loa

d re

quire

s lo

w fi

re o

nly.

16.

Plu

nger

and

/or m

axim

um s

prin

g

m

issi

ng.

17.

Jam

med

plu

nger

.

18.

Oth

er v

alve

pro

blem

s.

19.

Inad

equa

te s

uppl

y pr

essu

re.

15.

Incr

ease

tem

pera

ture

set

ting

10 d

egre

es.

16.

Che

ck fo

r par

ts (s

ee “V

alve

Adj

ustm

ents

” pg.

7, “

M/M

R V

alve

Dia

gram

”).

17.

Exa

min

e. P

lung

er s

houl

d be

sm

ooth

and

cle

an a

nd o

pera

te fr

eely

in s

olen

oid

slee

ve.

Mus

t be

inst

alle

d as

sho

wn

in “V

alve

Adj

ustm

ents

” pg.

7, “

M/M

R V

alve

Dia

gram

”.

18.

Rem

ove

wire

from

MR

val

ve.

19.

Rem

ove

sprin

g 5

from

MR

val

ve (s

ee “V

alve

Adj

ustm

ents

” pg.

7, “

M/M

R V

alve

D

iagr

am”)

pus

h do

wn

on p

lung

er. I

nsuf

ficie

nt m

anifo

ld p

ress

ure

with

furn

ace

oper

atin

g

in

dica

tes

supp

ly is

too

low

.

15.

If he

ater

goe

s to

hig

h fir

e, s

yste

m is

wor

king

c

orre

ctly.

16.

Inst

all c

orre

ct p

arts

.

17.

Cle

an p

lung

er if

nec

essa

ry.

18.

If M

R v

alve

rem

ains

on

low

fire

, val

ve is

not

o

pera

ting

prop

erly.

Che

ck it

em 1

9 be

low

, the

n

re

plac

e va

lve

if ne

cess

ary.

19.

Che

ck fo

r obs

truct

ion

in g

as p

ipe

ahea

d of

con

trols

.

In

crea

se g

as p

ress

ure

if po

ssib

le.

H.

Inco

rrec

t dis

char

ge a

ir te

mpe

ratu

re.

20.

Cal

ibra

tion

20.

Che

ck s

eal o

n ca

libra

tion

pote

ntio

met

er.

20.

Rec

alib

rate

per

“Tem

pera

ture

Cal

ibra

tion”

p

roce

dure

.

I.Er

ratic

or s

ever

ely

puls

atin

g fla

me.

21.

Dirt

y or

stic

king

plu

nger

.

22.

Inte

rmitt

ent s

horti

ng in

wiri

ng.

23.

Am

plifi

er n

ot o

pera

ting

prop

erly.

21.

Exa

min

e. P

lung

er s

houl

d be

sm

ooth

and

cle

an a

nd o

pera

te fr

eely

in s

olen

oid

slee

ve.

Mus

t be

inst

alle

d as

sho

wn

in “V

alve

Adj

ustm

ents

” pg.

7, “

M/M

R V

alve

Dia

gram

”.

22.

Insp

ect w

iring

.

23.

Obs

erve

DC

vol

tage

acr

oss

ampl

ifier

term

inal

s 1

and

2.

21.

Cle

an p

lung

er if

nec

essa

ry.

22.

Cor

rect

wiri

ng.

23.

If er

ratic

or p

ulsa

ting

DC

vol

tage

is o

bser

ved

and

wiri

ng s

how

s no

def

ects

, rep

lace

am

plifi

er. I

f

er

ratic

or p

ulsa

ting

volta

ge c

ontin

ues,

con

tact

M

axitr

ol C

ompa

ny.

*Con

trol

circ

uits

ext

erna

l to

the

Serie

s 21

can

cau

se b

urne

r mal

func

tion.

Alw

ays

chec

k m

anua

l val

ve to

be

cert

ain

gas

is o

n, a

nd c

heck

lim

it co

ntro

ls fo

r nor

mal

ope

ratio

n.

4© 2010 Maxitrol Company, All Rights Reserved

FIEL

D S

ERVI

CE

CH

ECK

LIST

PERFORMANCE CHECK

With modulator-regulator valve installed as instructed (voltages are approximate):

Low Fire is above 14 volts DC. Manifold pressure can be adjusted as follows:MR*10B10L Standard spring 0.2” to 1.2” w.c. (.5 to 3 mbar)MR*10B10L-1 spring 1” to 2.8” w.c. (2.5 to 7 mbar)

High Fire is obtained at zero volts DC.Use manufacturer’s pressure specifications when available. Maxitrol standard factory settings are 0.5” w.c. (1.25 mbar) mini-mum and 3.5” w.c. (8.75 mbar) maximum. H-1 models 1.75” w.c. (4.35 mbar) minimum and 11” w.c. (27 mbar) maximum.

At Temperature Selector:

1) Set the selector at least 10º higher than incoming air and allow discharge air temperature to stabilize. Discharge air tempera-ture should agree with temperature selector setting.

2) Increase temperature setting by 5º to 10º. Heater manifold pressure should immediately go to high fire. Manifold pressure will decrease as the discharge air temperature approaches the setting and will stabilize at the temperature setting.

3) Decrease temperature to the original setting. Burner should immediately turn off. Then, as the discharge air temperature decreases, the burner should ignite at low fire or selected high-fire start duration. Refer to Extended High-Fire Ignition section below. The discharge air temperature should again stabilize at the temperature setting.

If the preceding readings are not obtained:

4) Recheck wiring to ensure system is consistent with appropri-ate wiring diagram.

5) Check power source for 24 volts. Power LED is “ON”.6) Some automatic control valves require as much as 20 seconds

to open. In this case, check for voltage output at automatic valve terminals.

NOTE: Depending on the Btu capacity of the heater and the temperature rise, the discharge air temperature may be controlled by a continuous modulated flame (high temperature rises) or by on/off operation (low tempera- ture rises).

5© 2010 Maxitrol Company, All Rights Reserved

High Fire Ignition

J1

J1

J2

TIMER DISABLE

5 Seconds

25 Seconds

STARTTIME

STARTTIME

EXTENDED HIGH-FIRE IGNITION

The high fire start duration is field selectable. Amplifier will hold MR valve in the High Fire position for the set duration.

High-Fire duration of 0 seconds, 5 seconds, 25 seconds. (Times are approximate)

0 Seconds

IMPORTANT: Temperature range on dial must match sensor tem-perature range.

DAT (Discharge Air Temperature) potentiometer is clearly marked on the amplifier PCB. The AD1014U comes with the 55ºF - 90ºF label factory installed.

Following labels are shipped loose with the amplifier and can be field installed:

Label Sensor 55º - 90º * TS114 160º - 210º TS114C 40º - 80º TS114F 90º - 140º TS114G 110º - 160º TS114J * Label factory installed

• Locate desired Label (to match sensor).• Remove amplifier cover if so equipped.• There is no need to remove exisiting dial label.• Make sure dial surface is clean and dry.• Remove adhesive backing from desired label.• Carefully slip label under temperature pointer. Line up with the locating mark on the range being replaced, or with the center leg of the potentiometer.• Set pointers to desired temperature and replace cover if so eqipped.

A1010U LABEL INSTALLATION INSTRUCTIONS

Center Leg Locating Mark

SINGLE FURNACE OPERATION

A1010U

AD1010U

(MR valves and automatic gas valves wired in parallel as shown)

6© 2010 Maxitrol Company, All Rights Reserved

These wiring diagrams are for Series 21 discharge air sensing systems only. The R55 (Zero ohm Jumper) MUST be present on circuit board (located near terminals 5 & 7, outside of cover.)

Common Power Supply

MR VALVES 4 MAX.

24V-100VA

A1010U GAS VALVES (4 MAX.) 3.5 AMPS MAXA1010U

24V-100VA24V-100VA

GAS VALVES (4 MAX.) 3.5 AMPS MAX

A1010U

MULTIPLE FURNACE OPERATION

Wired in Parallel

Independent Power Supply

R55 must be present. *

8

R55 must be present. *

8

R55 must be present. *

8

R55 must be present. * 8

* R55 IS A ZERO OHM JUMPER

Common Power Supply

Common Power Supply

Independent Power Supply

Independent Power Supply

Independent Power Supply

7© 2010 Maxitrol Company, All Rights Reserved

Wired in Parallel

R55 must be present. *

VALVE ADJUSTMENTS

(See bulletin MMR_MT_EN for additional M/MR valve information)

NOTE: High Fire Adjustment should be checked whenever Low Fire Adjustment is changed.

Low Fire Adjustments:

A) Remove Cover (2)

B) Remove maximum adjusting screw (4), spring (5), and plunger (8). A small magnet is useful for this purpose.

C) Using minimum adjusting screw (9), set manifold pres-sure to furnace manufacturer’s specifications.

D) Replace plunger, spring retainer, spring and maximum adjusting screw in proper order.

E) Perform High Fire adjustment.

High Fire Adjustments:

A) Disconnect wire from amplifier terminal 3, remove cover plate (2).

B) Using maximum adjustment screw (4), set manifold pres-sure to furnace manufacturer’s specifications.

C) Reconnect wire to amplifier Terminal 3.

D) Replace cover plate (2) on Modulator-Regulator valve and reconnect wire to amplifier terminal 3.

1

10

9

8

7

6

23

4

5

M/MR Valve Diagram

Top Housing

Cover Plate

Seal Gasket

Maximum Adjustment Screw

Maximum Adjustment Spring

Solenoid

Minimum Adjustment Spring

Plunger

Minimum Adjustment Screw

Minimum Adjustment Screw Stop

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

NOTICE

The plunger is a precision part. Handle carefully to avoid marring or picking up grease and dirt. Do not lubricate.

8Maxitrol Company23555 Telegraph Rd., PO Box 2230Southfield, MI 48037-2230

SEL_21_MI_EN_04.2010

www.maxitrol.com© 2010 Maxitrol Company

All Rights Reserved