LENNOX Furnace/Heater, Gas Manual L08A6040

User Manual: LENNOX LENNOX Furnace/Heater, Gas Manual LENNOX Furnace/Heater, Gas Owner's Manual, LENNOX Furnace/Heater, Gas installation guides

Open the PDF directly: View PDF .
Page Count: 14

Download
Open PDF In Browser	View PDF

GAS

& BLOWER

UNIT KITS

;/q

i_Techrllca]

_Publications

AND ACCESSORIES

@1994 Lennox

Industries

Inc.

503,154M
8/94
Supersedes

Datlas, Texas

Litl_o
U.S.A.

ICM2+ REPLACEMENT
MOTOR KIT

502,994M

INSTALLATION
INSTRUCTIONS
FOR REPLACEMENT
VARIABLE SPEED MOTOR
USED ON G21V, GSR21V, GSR21CV, CB21 AND CBH21 SERIES UNITS

This kit is used to replace the ICM1 variable speed
blower motor with the ICM2+ motor used on G21V,

Package 1 of 1 contains:
1- Circuit board (JPB1 jumper

GSR21V, GSR21CV, CB21-41, -51, -65 and B21-41,
-51, -65 series units. Refer to table 1 for unit model

board)

1- Mounting bracket
1- Motor control harness

number

and corresponding

4- Wiring diagrams
1- Bag assembly containing:
6-#10 x 6 x 5/8 SDST screws

kit part number.

WARNING

4-Wires (blue, red, orange, purple)
4-Wire ties with screw hole mount
2- Stickers
1- tCM2+ replacement

KIT

motor

1- Motor power harness
Motor Replacement

1- PFC choke (V3 units only)

1- Remove both access panels from unit.
TABLE 1
ICM2+ REPLACEMENT MOTOR KIT APPLICATION
FURNACE/
BLOWER UNIT

MOTOR KIT
LB- NUMBER

MOTOR KIT
PARTNUMBER

G21V5, GSR21V5

LB-85899C

63J89

GSR21CV5

LB-85899D

63J90

G21V3, GSR21V3

LB-85899E

81Jll

CB21/B21-41

LB-85899A

56J60

CB21/B21-51
CB21/B21-65

LB-85899B

56J61

2- Unplug existing ICM1 motor power harness (P48)
and control harness (P49).
3- Remove green ground wire from blower housing.
4- Remove 2 blower
btower assembly.

securing

screws

and remove

5- Loosen the motor shaft set screw and bracket
securing screws. Remove existing ICM1 motor
from blower assembly. See figure 1. Remove
belly band screw to remove motor.

TYPICAL ICM1 MOTOR REMOVAL
ICM1 MOTOR
(TO BE REPLACED)

REMOVE MOTOR
SHAFT SET SCREW

REMOVE MOTOR
BRACKET SECURING
SCREWS

FIGURE 1
Page 1

6-Place replacementmotor (ICM2+) in motor
bracketassemblyaccordingto the dimension
shown in figure 2. Position motor/bracket
assemblyso that bracketsalign with holes in
blowerhousing,

MOTOR / MOUNTING
--_

A field-installed,
power factor correcting choke is
provided for use only on G21V3 units. G21V5 units are
factory equipped with the choke.
11-Determine
a location on the blower housing to
install the circuit board and mounting
bracket.
Location
must allow for wiring
through
the
blower deck strain relief to the control box, must
not cover warning or information
stickers, and
must be accessible to service. See figure 4.

BRACKET DIMENSION

A 4--

Circuit Board and Choke Installation

ICM2+
MOTOR

TYPICAL G21V CIRCUIT BOARD
INSTALLATION AND WIRING

G21V CONTROL BOX
TERMINAL STRIP

ROUTE WIRES
THROUGH
STRAIN RELIEF

MOUNITNG
BRACKET

MODEL
NUMBER
Dim. "A"

CB21V-41
CBH21V-41
G21V3
GSR21V3

CB21V-51/65
B21V-51/65

G21V5,
GSR21VS,
GSR21CV5

3-1/2"

2-1/8"

1"
FIGURE

KIT CIRCUIT
BOARD

/1_
BLOWER
HOUSING

FIGURE 4
7- Before tightening mounting bracket screws, belly
band screw and motor shaft set screw, the
embossed arrow on the ICM2+ motor must be
pointing UP (perpendicular to the blower housing
opening). In this position, the control and power
plugs on the motor will face downward,
See
figure 3.
8-Install
blower housing
assembly
in cabinet.
Secure with screws previously removed.
9- Install the ground wire to blower

housing.

10- Place one sticker on the blower housing close to
the motor and the other sticker close to the unit
nameplate.

12-Drill two mounting bracket holes on the blower
housing, See figure 4 for an example.
13-Install circuit board mounting
screws (provided).

bracket using two

14-Secure circuit board to mounting
provided stand-offs.

bracket

with

15-For G21V3 applications
only- Use two SDST
screws, provided, to install choke on side of
blower housing. See figure 5 for installation
dimensions.
G21V3 AND GSR21V3 PFC CHOKE
INSTALLATION LOCATION
14/2

G21V ICM2+ INSTALLATION

USE 2 SDST SCREWS
(PROVIDED) TO SECURE

-I_

_I-

r- t ,-3/,
3-9/16 _'

D
EMBOSSED ARROW ON
MOTOR MUST POINT UP

ALIGN MOTOR/BRACKET
ASSEMBLY WITH HOLES
IN BLOWER HOUSING

FIGURE 3

FIGURE 5

Page 2

Electrical Connections (Figure 12)
16- Connect motor control harness, provided with kit,
between
circuit
board
(J97-harness
to
P95-board)
and
motor
(P97-harness
to
J49-motor). See figure 6 for correct positioning of
control harness to the circuit board.
KIT CONTROL HARNESS TO
JPB1 CONTROL CONNECTION
SIDE VIEW

19- Remove control cover to expose back of terminal
board. Locate the three wires attached to the
terminals behind the fuse. See detail in figure 12.
20- Remove the single wire from the right side of the
left set of fuse spade connections. Install the 1/4"
piggy back end of orange wire to the spade
connection. Attach the previously removed wire
to the piggy back connection on the orange wire,
Connections should be made so that the spades
are facing away from the terminal strip mounting
screw.
21- Route the orange wire from the control box strain
relief hole through the blower deck strain to the
original
motor control
harness (P49). Install
terminal in either socket #3 or #6 of P49. Replace
control box cover.
22-Connect
original motor control harness (P49) to
6-pin plug on circuit board (J95).
23- Refer
to
application

Jumper
Adjustment
section
specific jumper selections.

for

,A WARNING
FIGURE 6
17- Connect motor power harness, provided with kit,
between original power harness (J96-kit harness
to P48-original
harness) and the motor (P96-kit
harness to J48-motor).

Motor Replacement

18- For G21V3 applications only- Con nect two loose
wires from kit power harness (J96!P48) to PFC
choke terminals.
Make sure insulation
tubing
covers connections. Tape over tubing and wire
with electrictians tape to ensure protection. See
figure 7 for field wiring.
G21V3 AND GSR21V3 CHOKE
FIELD WIRING DIAGRAM

2- Unplug existing ICM1 motor power harness (P48)
and control harness (P49).
3_

CONNECT TWO LOOSE
8-

FIGURE 7

Page 3

blower deck harness P98/J98.

5- Remove 2 blower
blower assembly.

KIT CONTROL HARNESS

CHOKE

Unplug

4- Remove green ground wire from blower housing.

HARNESS TO TERMINALS

Remove both access panels from unit.

securing

screws

and remove

Loosen the motor shaft set screw and bracket
securing screws. Remove existing ICM1 motor
from blower assembly. See figure 1. Remove
belly band screw to remove motor.
Place replacement
motor
(tCM2+) in motor
bracket assembly according to the dimension
shown
in figure
2. Position
motor/bracket
assembly so that brackets align with holes in
blower housing.
Before tightening mounting bracket screws, belly
band screw and motor shaft set screw, the
embossed arrow on the ICM2+ motor must be
pointing UP. For horizontal applications,
motor
arrow must point to the top of the unit. For
downflow applications, the arrow must point to
the return air end of the furnace, tn this position,
the control and power plugs on the motor wilt
face downward. See figure 8.

GSR21V ICM2+ INSTALLATION

TYPICAL GSR21V & GSR21CV CIRCUIT
BOARD INSTALLATION AND WIRING

\
KIT CIRCUIT
BOARD

ALIGN
MOTOR/BRACKET
ASSEMBLY WITH
HOLES IN BLOWER
HOUSING

/
/

FIGURE 9
16- For GSR21V3 applications only- Use two SDST
screws provided to install choke on side of blower
housing. See figure 5 for installation dimensions.

EMBOSSED ARROW
ON MOTOR
MUST POINT UP

Electrical Connections (Figures 13 and 14)
17- Select the blue and purple wires provided in the kit.
18- install socket terminal of purple wire, provided in
kit, into either socket #3 or #6 of the original
motor control harness (P49),
0

19- install pin terminal end of purple wire into socket
#11 of the blower deck harness jack (J98).

DOWNFLOW

HORIZONTAL

FIGURE 8

9-Install
blower housing
assembly
in cabinet.
Secure with screws previously removed.
10- Install the ground wire to blower

housing,

11- Place one sticker on the blower housing close to
the motor and the other sticker close to the unit
nameplate.
Circuit Board and Choke Installation
A field-installed,
power factor correcting choke is
provided for use only on GSR21V3 units. GSR21V5
units are factory equipped with the choke.
12- Use mounting bracket as a template to mark two
7/32" mounting holes on the blower deck flange.
Drill holes, See figure 9.
13-Place mounting bracket on the back side of the
blower deck flange and align drilled holes with
those in the mounting bracket,

20- Connect original motor control harness (P49) to
6-pin plug on circuit board (J95).
21-Trace the brown wire from the back side of the
fuse located on the terminal strip to the wire
bundle in the control box. See detail in figure 13,
Unscrew wire nut from bundle and add the kit
provided blue wire to it, Secure all wires together
with wirenut, Route the opposite end of blue wire
to control box side of blower deck harness and
insert it into position #11 of the plug (P98).
22- Re-connect blower deck harness P98/J98.
23- Connect motor control harness, provided with kit,
between
circuit
board
(J97-harness
to
P95-board)
and
motor
(P97-harness
to
J49-motor).
See figure 6 for correct positioning
of control harness to the circuit board.
24- Connect motor power harness, provided with kit,
between original power harness (J96-kit harness
to P48-originat
harness) and the motor (P96-kit
harness to J48-motor).

14-Install two screws, provided, through the flange
and into the bracket to secure, Mount bracket on
side of the flange.

25- For G21V3 applications only- Connect two loose
wires from kit power harness (J96/P48) to PFC
choke terminals,
Make sure insulation
tubing
covers connections. Tape over tubing and wire
with eiectrictians tape to ensure protection. See
figure 7 for field wiring.

15-Secure circuit board to mounting
provided stand-ells.

26- Refer
to
application

bracket

with

Page 4

Jumper
Adjustment
section
specific jumper selections,

for

8-Install
blower
housing
assembly
in cabinet,
Secure with screws previously removed.
9- Install the ground wire to hex screw on blower
housing,
10- Place one sticker on the blower housing close to
the motor and the other sticker close to the unit
nameplate.

WARNING
Motor Replacement

Circuit Board Installation

1- Remove blower access panel from unit,
2- Unplug existing ICM1 motor power harness (P48)
and control harness (P49),
3- Removegreen

ground wire from blower housing.

4- Remove two blower securing screws and remove
blower assembly.
5- Loosen the motor shaft set screw and bracket
securing screws. Remove existing tCM1 motor
from blower assembly. See figure 1, Remove
belly band screw to remove motor,

11-Determine
a location on the blower housing to
install the circuit board and mounting
bracket,
Location must allow for wiring to the control box,
must not cover warning or information
stickers,
and must be accessible to service. See figure 11.
TYPICAL CB21/B21V CIRCUIT BOARD
INSTALLATION AND WIRING
CB21V
TERMINAL STRIP

6-Place
replacement
motor
(ICM2+) in motor
bracket assembly according
to the dimension
shown
in figure
2. Position
motor/bracket
assembly so that brackets align with holes in
blower housing.
7- Before tightening mounting bracket screws, belly
band screw and motor shaft set screw, the
embossed arrow on the ICM2+ motor must be
pointing
UP. For upflow
applications,
motor
arrow must point to the blower housing opening.
For downflow applications, the arrow must point
to the return air end of the furnace. In this
position, the control and power plugs on the
motor
will
face downward.
For horizontal
applications, motor arrow must point to the back
of the unit with the power and control plugs
toward the access panel side. See figure 10.
CB21/B21V ICM2+ INSTALLATION
ALIGN MOTOR/BRACKET
ASSEMBLY WITH
)LES IN BLOWER HOUSING

Y
KIT CIRCUIT
BOARD
BLOWER
HOUSING

FIGURE 11
12- Use mounting bracket as a template to mark two
7/32" mounting
holes on the blower housing.
Drill holes and secure bracket to blower housing
with two screws provided. See figure 11,
13-Secure circuit board to mounting
bracket with
provided stand-offs.
Electrical Connections (Figure 15)
14- Connect motor power harness, provided with kit,
between original power harness (J96-kit harness
to P48-original
harness) and the motor (P96-kit
harness to J48-motor).
15- Connect motor controt harness, provided with kit,
between
circuit
board
(J97-harness
to
P95-board)
and
motor
(P97-harness
to
J49-motor),

....

ARROW
ON MOTOR
MUST POINT UP

FOR
HORIZONTAL,
PLUG FACES
ACCESS PANEL
HORIZONTAL

FIGURE 10

UPFLOW

o
_.........
-DOWNFLOW

16-Connect original motor control harness (P49) to
6-pin ptug on circuit board (J95).
17- Install red wire, provided in kit, into either socket
#3 or #6 of the original motor control harness
(P49).
18- Install
opposite
end
of red wire
(spade
connection) to terminal "R" on the thermostat
terminal strip.
19- Refer
to Jumper
Adjustment
section
for
application specific jumper selections,
Page 5

TYPICAL

G21V ICM2+ WIRING

DIAGRAM
2#V

z_CONNECT WIRE TO THE
FUSEHOLDER SPADE ON
BACK SIDE OF LOW
VOLTAGE TERMINAL BOARD.
(OPPOSIDE SIDE OF FUSE
FROM TRANSFORMER BLUE
LEAD.)

USE COPPER CONDUCTORS
ONLY. REFER TO UNIT
RATING PLATE FOR
MINIMUM CIRCUIT
AMPACITY AND MAXIMUM
FUSE 51ZE
NEC/CEC

CONTROL

CLASS

72
• P72
GVI
EOUIP
GROUND

ACC

KEY
&3
&24
53
_6
=I
3VI
J46
J48
J49
J72
J73
_43
LI5
"46
"4B
"49
"72
"73
51
510
_51
572
578
rl
rBI
FB2

ULSCH[HIION
COMPONENT
:ONTROL BURNER
:ONTROL VSP
_O_OR BLOWER
_OTOR COMB AIR BLOWER
:USE TRANSFORMER.TI
/ALVE GAS
JACK OUTPUT
JACK MOTOR.VAR.SPD
JACK MOTOR,VAR.SPD.
JACK PRIMARY CONTROL
JACK VSP CONTROL
RELAY ECONOMIZER
COIL CHOKE
_LUG OUTPUT
"LUG MOTOR,VAR.SPD.
"LUG MOTOR,VAR.SPD.
CONTROL
JLUG VSp CONTROL
HERMOSTAT ROOM
_W[_CH L[MIT,PR[
GAS
_WITCH DOOR INTERLOCK
_W[TCH DIFF. PRESSURE
_WITCH MODULATION CONTROL
rRANSFORMER CONTROL
ERMINAL STRIP LOW VOLTAGE
tERMINAL STRIP UNIT

LI3 WIRED
IHP MOTOR

AS SHOWN.
[V5 UNIT5)

_2)
_OENOTES

_FY
_53
1£5
J96
J97
_95
"96
P97
--LINE

OPTIONAL

COMPONENTS

MOTOR KIT COMPONENTS
DESCRIPTION
COMPONFNTS
]ONTROL JP61 SPEED £ELECTOF
JACK JPBI SPEED SELECTOR
JACK OPBI POWER INTERFACE
JACK JPBI/B5
INTERFACE
JLUG JPBI SPEED SELECTOR
PLUG JPBI PO#ER INTERFACE
"LUG JPBI/B5 INTERFACE
VOLTABE FIELD WIRING
CLASS [[ VOLTAGE FIELD INSTALLED

EXISTING WIRE
(PIGGY BACK TO ORANGE KIT WIRE) _

_._
i!

ORANGE KIT WIRE
(WITH PIGGY BACK CONNECTION)_

H
BLUE WIRE TO
TRANSFORMER

BACK OF TERMINAL

STRIP

TERMINALS

FIGURE 12
Page 6

ON BACK OF FUSE

TYPICAL

GSR21V

ICM2+

WIRING

DIAGRAM

A
USE COPFER CONDUCTORS
&'e..Y.
REFER TO UNIT
RATINS R.AII_FOR
Q INII/AJM
CIRCUIT
AMPACITY AND MAXIli_Id
FUSE SIZE
NEC/CEC CLASS 2

El0
SZl

CONNECT WIRE TO WIR_
NUT CONTAININO WIDE
FUSE HOLDER.
CONTAINS

K43-1

[]

521 JON

ECON

15 AUTO RESET ON
UNITS ONLY,

Ut_ITE.)

FI
S,OA
TypEI
MEX

2
J72

NOTE-JP98 IS LDEATEI
ON BL(7_ZR DECK
A24

_.COOL

S7B

_}__ON___
THIS WIRE NOT tPSED
ON JOHNSONBURNER
CONTR(JL

PLACE OUTDOORUNIT
AND/ON TEMPERATLJI_
CONTROLDI ABRAM
DEDE,

_,P7Z

WIRE IS FIELD INSTALLED IN
,_ SOCKET ,II OF BLOWER DECK
PLON & JACK(_.JON).WIDE
15 PROVIDED IN THE MOTOR
REPLACEMENT KIT.

ONOONDEQUIP
/.'_,K43

Z_ FIELD INSTALLED WIRE
IN OPEN SOCKETOF PAD
PLUG {EITDER '3 ON '6}
PROVIDED WITH BLOWER
MOTORREPLACEMENTKIT.

24V

LCmae}N c
/ 397

0000

JACK-MOTOR• VAR.SPD.
JACK-BLOY4ERDECK
A¥-

B3
MOTORNIT COMPONENTS

LINE VOLTADE FIELD IIRIN6
-- CLASS II VOLTAGE FIELD WIRINS

BLUE WIRE TO TRANSFORMER
_
BACK OF FUSE
ON TERMINAL

WIRE

NUT

P98
LOCATED AT
BLOWER DECK

BUNDLE

STR,P
_

BLUE KIT WIRE

(CONNECT TO WIRE NUT BUNDLE
AND TO POSITION #11 IN P98)

FIGURE 13
Page 7

TYPICAL

GSR21CV

ICM2+ WIRING

DIAGRAM

P?(/

170

(}FI

FIGURE 14

Page 8

PTO

TYPICAL

CB21/B21-41

& CB21/B21-51/65

FIELD WIRING FOR ECB21
UNITS WITHOUT CIRCUIT BREAKERS

FIELD
UNITS

CIRCUIT

4
CBB

C[RCUITLI
LI _

ICM2+ WIRING

DIAGRAM

WIRING FOR ECB21
WITH CIRCUIT BREAKERS
CIRCUIT

CIRCUIT

A co_A
,,_I__/T_ z_

A c°'A
LI _/T
_-

L2 _2
L2 _
AL3...,_
AL__A

L2
_L3
_

A
A

CONNECT POWER WIRES FROM
HEATER LABELED LI,L2
ON
"P" VOLTAGE UNITS AND
LI,LB,L3
ON "Y" VOLTAGE
UNITS TO TOG TERMINAL
STRIP
IN INDOOR UNIT.

EQUIPMENT IN GROUND
LOCATED
INDOOR :A
THE NUMBER OF CIRCUITS
VARY
UNIT
_ACCOROINB
TO HEATER MOOEL.
REFER TO FAN COiL NAMEPLATE
FOR ACTUAL NUMBER EMPLOYEO

A
Z_

REFER
CHART

TO FACTORY BLOWER SPEED TAP SELACT[ON
ON UNIT FOR BLOWER
SPEED
iNFORMATION

USE
COPPER FOR
CONDUCTORS
ONLY.
TO UNIT
NAMEPLATE
MINIMUM
CIRCUIT REFER
AMPACITY
ANO MAXIMUM
OVERCURRENT
PROTECTION
51ZE

ECBBI
SERES

2#V

POWER

1
05

BLOWER

Ao×MEAT
,

I I

W2
z_

AGX HEAT 2

A
Y2

•

AF4_

C°°L/BEAT
2

m_Oj_
5

_
L_

EQUIP
GROUND
J4B
J4E

VALVE
YI

LqE]_

(I_

CIRCUIT

REV

COOL/HEATI

WHEN TWO SPEED THERMOSTAT IS USED,CONNECT
SECOND STAGE HEAT BULB TO TERMINAL
"W2" AND
REMOVE JUMPER BETWEEN TERMINALS
"R" & "W2"

/x
WHEN OUTDOOR THERMOSTAT IS USEO,CONNECT
LEADS
_TO
TERMINALS
"R" AND "WB" AND REMOVE JUMPER

CBB

LI
CONNECT

L2_

JUMPER

BETWEEN

WHEN CBBI 15 MATCHEO
UNIT, CONNECT
JUMPER

"YI

"YB"

WITH CONOENS[NB
BETWEEN
"R" & "0"

WHEN HUMIO[TY
CONTROL
{ABO] [5 NOT USEO
COMBINATIO
WiTH TWO 5PEEO COMPRESSOR,
CONNECT
JUMPER BETWEEN
"Y2" ANO "OS"

A
49
A

WHEN HUMIOITY
CONTROL
[A20) [5 NOT UBEO iN
COMBINATION
WITH SINGLE SPEED COMPRESSOR,
CONNECT
JUMPER BETWEEN
"YI" AND "05"
--LINE
CLASS

VOLTAGE
F[ELO WIRING
[i VOLTAGE
FIELO WIRING

BAV
COMMON

1P97
CB21 SERIES
MOTOR KiT
COMPONENTS

(EY
_15
CB21
SERIES

13
:B5
:I
J_5
J46
J4B
JAB
(20_
J2
_46
_48
rl
rBl

DESCRIPTION
COMPONENT5
CONTROL JPBI SPEED SELECTOR
JACK JPBI 5PEEO SELECTOR
POWFR [NTFRFARF
JACK JPBI/B3
INTERFACE
PLUG JPBI 5PEEO SELECTOR
PLUG JPBI POWER
iNTERFACE
_LUG JPBI/B3
INTERFACE

(EY
k53
J95
Jg6
J97
_95
_96
J97

DESCRIPTION
COMPONENT
CONTROL
BLOWER DRIVE
MOTOR BLOWER
CIRCUIT
BRKR BLO MTR
USE TRANSFORMER
JACK INPUT
JACK OUTPUT
JACK MOTOR,VAR
SPO
JACK MOTOR,VAR
SPD
I,_ RELAY BLOWER
JACK ELECT.
HEAT
PLUG iNPUT
"LUG OUTPUT

LENNOX_o.,.o._°o. W[RiNGOiAGRAMIg/g3
COILS

BLOWER COIL

UNITS

"LUG MOTOR_VAR
BPD
"LUG MOTOR,VAR
BPO
TRANSFORMER
CONTROL
TERM STRIP CLASS
]I VOLT

C821 41,51,65
IP
CBH21 41 IP
821 51,65
WITH MOTOR KIT
COIL SECTION 1846
£up_r_d_

Form N_

N_w F_rm

IP
N_

529,854W
@1993

Lannox

Industrlas

FIGURE 15
Page 9

Inu

Lilh¢

U.S.#

"ADJUST"
The ADJUSTpinsallowthe motorto run at normal
speed,approximately10%higher,or approximately
10%lowerthannormalspeed.Table9 givesthreerows
( +, NORMAL,and -) with their respectiveCFM
volumes.Noticethatthenormaladjustmentsettingfor
heatspeedposition#3 is 2000CFM,The+ adjustment
settingfor that positionis 2180CFMand for the adjustmentsettingis 1800CFM.Afterthe adjustment
setting has been determined,chosethe remainder
speedjumpersettingsfromthoseofferedin thetable.
The TEST pin is available to bypass the JPB1
control and run the motor at approximately
70% to
test that the motor is operational.
This is beneficial
primarily
in troubleshooting.
for motor to run.

G must be energized

"H EAT"
The HEAT jumper is used to set the blower speed to
obtain the required CFM for heating. G21V and
GSR21V unit require a jumper between HB and W2 to
allow HEAT to control heating speed.
For G2 lVand GSR2 lVunits - If a lower heating speed
(than one that is listed in HEAT SPEED section) is

IMP( IRTANT

To change jumper positions, gently pull the jumper off
the pins and place it on the desired set of pins. The
following
section
outlines
the different
jumper
selections available and conditions associated with
each one, Refer to figure

16 for identification.

Adjust circuit board jumpers for High, Low, Heat and
Adjust according
to tables 2, 3, and 4 for G21V,
GSR21V and GSR21CV units, table 5 for CB21V-41
and CBH21V-41 units, and table 6 for CB21V-51,
CBH21V-51, CB21V-65, CBH21V-65 and B21V-51/65
units. The entire group of CFM options are shown in
table 9 for G21V, table 10 for GSR21V, table 11 for
GSR21CV
units,
table
12 for CB21V-41
and
CBH21V-41
units, and table 13 for CB21V-51,
CBH21V-51, CB21V-65, CBH21V-65 and B21V-51i65
units. Note that speeds selected must all come from
the same row because the Adjust
determines the speeds available,

required, the LOW jumper may be used to set the
heating speed. This is done by first placing the LOW
jumper
in the desired CFM position
and then
removing a jumper between HB and W2 on the unit

S _,

ADJUST

HEAT

2
1

TE_ST

"HIGH"

HIGH

LOW

The HIGH jumper is used to determine
the CFM
during cooling speed. These jumper selections are
activated when G and DS terminals are energized for
G21V, GSR21V or GSR21CV and when G, DS and O are
energized for the CB21.

J95

The LOW jumper is used to determine
CFM during
low speed cooling. These jumper selections
are
activated when G is energized. The LOW jumper
may also be used for low speed heating for G21V
and GSR21V units only. See the "HEAT" section for
details.

Page lO

position

"A53" JPB1 KIT BLOWER BOARD

terminal strip. Doing so will activate the low speed
jumper setting when W1 is energized. The heat speed
is not operable on GSR21CV units.

"LOW"

jumper

FIGURE 16

P95

TABLE 2
G21V3 and GSR21V3 SERIES UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(ForStaticPressure0.0" to 0.8" w.g.)
ORIGINAL
MOTOR
SPEED TAP
POSITION

ORIGINAL
MOTOR
APPROXk
MATE CFM

CIRCUIT BOARD
JUMPER
POSITION

490

LOW 1"

TABLE 4
GSR21CV5 SERIES UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(For Static Pressure O.O" to 1.2" w.g.)

ADJUSTMENT
JUMPER
POSITION

ORIGINAL
MOTOR
SPEED TAP
POSITION

ORIGINAL
MOTOR
APPROXIMATE CFM

CIRCUIT BOARD
JUMPER
POSITION

905-1020

LOW 2

NORM

945-!030

LOW 2

NORM

1170-1330

LOW 3

NORM
NORM

NORM

ADJUSTMENT
JUMPER
POSITION

635

LOW 2*

NORM

760

LOW 3*

NORM

1345-1500

LOW 4 / HIGH 1

880

LOW 4*

NORM

!510-1700

HIGH 2

"-"

1030

HEAT 1 / HIGH 1

NORM

1700-1850

HIGH 2

NORM

1140

HEAT 2 / HIGH 2

NORM

1885-2000

HIGH 2

"+"

2010-2100

HIGH 3

NORM

2000-2200

HIGH 4

NORM

2000-2200

HIGH 4

NORM

1220

HEAT 3 / HIGH 3

NORM

1345

HEAT 3 / HIGH 3

"+"

1420

HEAT 4 / HIGH 4

"+"

1420

HEAT 4/HIGH

"+"

*HEAT is not used on GSR2 I CV units.
TABLE

CB21V/CBH21V-41

*HEAT will be the heating speed if a jumper is present between
terminals HB and W2 on the unit terminal strip. For LOW to be the
heating speed, remove the jumper between terminals HB and W2
on unit terminal strip, if present.

TABLE 3
G21V5 and GSR21V5 SERIES
ICM1 SPEED TAP TO ICM2+ JUMPER

ICM1

ORIGINAL
MOTOR
APPROXlMATE CFM
770

CIRCUIT BOARD
JUMPER
POSITION
LOW 1"

TAP

ICM2+

(For Static Pressure 0.0" to 0.6" w.g.)

UNITS
SELECTIONS

ORIGINAL
MOTOR
SPEED TAP
POSITION

ORIGINAL
MOTOR
APPROXk
MATE CFM

CIRCUIT BOARD
JUMPER
POSITION

676

LOW 1

NORM

750

LOW 1

NORM

850

LOW 2

NORM

926

LOW 3

NORM

1025

LOW 4 / HIGH 1

NORM

1125

HEAT I / HIGH 2

NORM

!225

HEAT 2 / HIGH 3

NORM

1325

HEAT 3 / HIGH 3

NORM
NORM

(For Static Pressure0.0" to 0.8" w.g.)
ORIGINAL
MOTOR
SPEED TAP
POSITION

SPEED

5
SERIES
UNITS
JUMPER
SELECTIONS

ADJUSTMENT
JUMPER
POSITION
NORM

ADJUSTMENT
JUMPER
POSITION

1015

LOW 2*

NORM

1305

LOW 3*

NORM

1400

HEAT 4 / HIGH 4

1510

LOW 4*

NORM

!550

HEAT 4/HIGH

"+"

"-"

1550

HEAT 4/HIGH

"+"

1685

HEAT 2 / HIGH 2

1820

HEAT 2 / HIGH 2

NORM

2010

HEAT 2 / HIGH 2

"+"

2050

HEAT 3 / HIGH 3

NORM

2100

HEAT 3 / HIGH 3

NORM

2100

HEAT 3 / HIGH 3

NORM

TABLE

CB21V / CBH21V / B21V-51/65
ICM1

SPEED

TAP

ICM2+

SERIES

JUMPER

UNITS

SELECTIONS

(For Static Pressure O.0" to 0.6" w.g.)

Page 11

ORIGINAL
MOTOR
SPEED TAP
POSITION

ORIGINAL
MOTOR
APPROXk
MATE CFM

CIRCUIT BOARD
JUMPER
POSITION

ADJUSTMENT
JUMPER
POSITION

750

LOW 1

NORM

850

LOW 1

NORM

950

LOW 2

NORM

1150

LOW 3

NORM

1300

LOW 4

NORM

!500

HEAT 1 / HIGH 1

NORM

1650

HEAT 2 / HIGH 2

NORM

1800

HEAT 3 / HIGH 3

NORM

!950

HEAT 4/HIGH

NORM

2100

HEAT 4/HIGH

"+"

2100

HEAT 4/HIGH

"+"

TABLE 7
G21V3-60/80

ICM2+

(For Static
ADJUST
JUMPER
SETTING

BLOWER
Pressure

LOW SPEED
JPB1 JUMPER POSITION

MOTOR

PERFORMANCE

0.0" to 0,8" w.g.)

HIGH (COOL) SPEED
JPB1 JUMPER POSITION

HEAT SPEED
JPB1 JUMPER POSITION

540

700

830

1000

1150

1260

1400

1410

1150

1250

1350

1400

NORM

490

630

740

880

1040

1140

1240

1265

1030

1140

1220

1300

440

560

670

800

940

1030

1140

1160

920

1020

1100

1190

NOTE: ADJUST position

on JPB1 ("NORM",
GSR21V3-80

"+", or "-") determines
ICM2+

(For Static
ADJUST
JUMPER
SETTING

the row of CFM available

TABLE 8
BLOWER MOTOR
Pressure

LOW SPEED
JPB1 JUMPER POSITION

to use.

PERFORMANCE

0.0" to 0.8" w.g.)

HIGH (COOL) SPEED
JPB1 JUMPER POSITION

HEAT SPEED
JPB1 JUMPER POSITION

520

670

800

960

1110

1220

1340

! 420

1110

1210

13!0

1420

NORM

480

600

740

880

1070

1160

1270

!300

1000

1100

1200

1280

420

550

650

770

950

1040

1150

! 170

900

1000

1100

1! 50

NOTE: ADJUST position

on JPB1 ("NORM _, "+", or "-") determines

G21V5-80/100

ADJUST

Pressure

LOW SPEED
JPB1 JUMPER POSITION

JUMPER
SETTING

TABLE 9
BLOWER MOTOR

ICM2+

(For Static

the row of CFM available

to use.

PERFORMANCE

0.0" to 0,8" w.g.)

HIGH (COOL) SPEED
JPB1 JUMPER POSITION

HEAT SPEED
JPB1 JUMPER POSITION

800

1050

14!0

1620

1710

2030

2270*

1900

2140

2270*

NORM

720

950

1280

1500

1570

1850

2100

2220

1700

1940

2080

2200

850

1120

1310

1420

1650

1860

!990

1520

1730

1860

1940

620
NOTE: ADJUST position

on JPB1 ("NORM",

"+", or "-") determines

the row of CFM available

to use.

*2300 CFM @ 0.2" w.g.; 2250 CFM @ 0.5" w.g.; 2200 CFM @ 0.8" w.g.
TABLE
GSR21V5-80/100

ICM2+

(For Static
ADJUST
JUMPER
SETTING

BLOWER

Pressure

LOW SPEED
JPB1 JUMPER POSITION

MOTOR

PERFORMANCE

0.0" to 0,8" w.g.)

HIGH (COOL) SPEED
JPB1 JUMPER POSITION

HEAT SPEED
JPB1 JUMPER POSITION

860

1100

1460

1740

1800

2090

2100-

1930

2100-

NORM

770

1020

1390

1580

1720

1990

2100"

1800

2000

2100"

680

900

1180

1400

1450

1690

1940

2040

1580

1780

1920

2010

NOTE: ADJUST position

on JPB 1 ("NORM ", "+", or "-") determines

the row of CFM available

*2200 CFM @ 0.2" w.g.; 2100 CFM @ 0.5" w.g.; 2000 CFM @ 0.8" w.g.

Page12

to use.

TABLE 11
GSR21CV5-80/100 ICM2+ BLOWER MOTOR PERFORMANCE
(For Static Pressure O.O" to 1.2" w.g.)
ADJUST
JUMPER
SETTING

LOW SPEED
STATIC

NORM

HIGH (COOL)

JPR1 JUMPER POSITION

JPB1 JUMPER POSITION

1.2

750

1080

1440

1670

1790

2000

1.0

790

1090

1450

1660

1800

2080

2070

2080

840

1130

1460

1640

1770

2100

2230

2210

1.2

680

940

1340

1510

1490

1870

2020

2000

1.0

700

960

1350

1510

1500

1880

2110

2070

0.5

750

1030

1360

1520

1500

1840

2130

2220

1.2

590

790

1160

1330

1410

1670

1920

1980

1.0

610

830

1180

1350

1420

1660

1940

2010

0.5

670

900

1200

1360

1440

1640

1920

2010

CB21V-41
(Operating
ADJUST
JUMPER

on JPB 1( "NORM",

TABLE 12
CBH21V-41
BLOWER

AND

at 0.00 through

0,60 in. w.g.

LOW SPEED
JPB1 JUMPER POSITION

0.5

NOTE: HEA Tspeed tap is not used on GSR21CV units. ADJ USTposition
CFM available to use.

SETTING

HEAT SPEED

SPEED

"+"

or "-')

determines

the row of

PERFORMANCE

External

Static

Pressure)

HIGH (COOL) SPEED
JPB1 JUMPER POSITION

HEAT SPEED
JPB1 JUMPER POSITION

850

950

1060

1!50

1150

1250

1490

!600

1230

1346

1480

1600

NORM

750

850

950

1025

1125

1325

!425

1125

1225

1325

1425

650

730

830

900

1000

1190

!260

980

1080

1190

1260

NOTE: ADJUST position

on BDC-2 ("NORM';

"+", or "-") determines
TABLE

CB21V-51,

CBH21V-51,
(Operating

ADJUST
JUMPER
SETTING

the row of CFM available

to use.

CB21V-65,
CBH21V-65
AND B21V-51/65
BLOWER PERFORMANCE
at 0,0O through
0.60 in. w.g. External
Static Pressure)

LOW SPEED
JPB1 JUMPER POSITION

HIGH (COOL) SPEED
JPB1 JUMPER POSITION

HEAT SPEED
JPB1 JUMPER POSITION

935

1060

1265

1425

1650

1780

1955

2160

1650

1800

2000

2200

NORM

850

950

1150

1300

1500

1650

1800

!950

1500

1650

1800

1956

850

1026

1!10

1350

1485

1560

!760

1340

1480

1630

1760

the row of CFM available

to use.

750
NOTE: ADJUST position

on BDC-2 ("NORM _, "+", or "-") determines

Page13

Tocheck-outtheICM2+refertofigure17andfollowthe
check-outprocedureasoutlined.If theblowerfailsany
of thesetests,do not attemptto repairthe motor.
ICM2+

Therearenofieldserviceable
partsin thiscomponent.
Replace
themotorandrepeatthecheck-outprocedure,

CHECK-OUT

A kit is available from the Lennox parts center to use in testing the variable speed motor. The kit 70J 11 includes a
test plug harness to facilitate vsm check-out. Follow testing procedures outlined in the instructions provided
with the kit. The testing procedures are different than those listed below. If not using the kit to test the motor,
follow the procedure below.
NOTE-Any A. C. voltage source less than 30 volts or any D.C. voltage source less than 20 volts may be used to
check out the motor. An ordinary 9 volt battery is recommended,
Unit transformer
T1 secondary may be
used in lieu of a battery. A 9 volt battery will last for about one day of normal operation. If transformer T1 is
used, double check all wiring

connections

before placing

CHECK-OUT
1

unit back in operation.

PROCEDURE

1234-

Disconnect power to unit.
Disconnect 11 pin plug located on JPB1.
Connect
voltage
shown above.
ICM2+
LOW source
SPEED as
CHECK-OUT
Turn on power to unit. Blower should
operate at low speed.

ICM2+ HIGH SPEED CHECK-OUT
5- Disconnect

power to unit.

6- Connect voltage source as shown above.
7- Turn on power to unit. Blower should
operate at high speed.
1

wn above.
r should

o e,a

eed

FIGURE 17

Page 14

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : No
Page Count                      : 14
Page Layout                     : SinglePage
Page Mode                       : UseNone
Producer                        : Goby Monitor Application version 4, 0, 0, 13
Create Date                     : Sun Jul 20 21:11:22 2008
Author                          : 
Title                           : 
Subject                         :

EXIF Metadata provided by EXIF.tools

LENNOX Furnace/Heater, Gas Manual L08A6040

Navigation menu

Versions of this User Manual:

Views

Navigation