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

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GAS & BLOWER UNIT KITS ;/q i_Techrllca]
i _Publications
AND ACCESSORIES Litl_oU.S.A.
@1994 Lennox Industries Inc.
Datlas, Texas 503,154M
8/94
Supersedes 502,994M
ICM2+ REPLACEMENT
MOTOR KIT
INSTALLATION INSTRUCTIONS FOR REPLACEMENT VARIABLE SPEED MOTOR KIT
USED ON G21V, GSR21V, GSR21CV, CB21 AND CBH21 SERIES UNITS
Package 1of 1 contains:
1- Circuit board (JPB1 jumper board)
1- Mounting bracket
1- Motor control harness
4- Wiring diagrams
1- Bag assembly containing:
6-#10 x 6 x 5/8 SDST screws
4-Wires (blue, red, orange, purple)
4-Wire ties with screw hole mount
2- Stickers
1- tCM2+ replacement motor
1- Motor power harness
1- PFC choke (V3 units only)
This kit is used to replace the ICM1 variable speed
blower motor with the ICM2+ motor used on G21V,
GSR21V, GSR21CV, CB21-41, -51, -65 and B21-41,
-51, -65 series units. Refer to table 1 for unit model
number and corresponding kit part number.
WARNING
Motor Replacement
TABLE 1
ICM2+ REPLACEMENT MOTOR KIT APPLICATION
FURNACE/ MOTOR KIT MOTOR KIT
BLOWERUNIT LB- NUMBER PARTNUMBER
G21V5, GSR21V5 LB-85899C 63J89
GSR21CV5 LB-85899D 63J90
G21V3, GSR21V3 LB-85899E 81Jll
CB21/B21-41 LB-85899A 56J60
CB21/B21-51 LB-85899B 56J61
CB21/B21-65
1- Remove both access panels from unit.
2- Unplug existing ICM1 motor power harness (P48)
and control harness (P49).
3- Remove green ground wire from blower housing.
4- Remove 2 blower securing screws and remove
btower assembly.
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
REMOVE MOTOR
SHAFT SET SCREW
ICM1 MOTOR
(TO BE REPLACED)
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 BRACKET DIMENSION
--_ A 4-- ICM2+
MOTOR
MOUNITNG
BRACKET
CB21V-41 G21V5,
MODEL CBH21V-41 CB21V-51/65 GSR21VS,
NUMBER G21V3 B21V-51/65 GSR21CV5
GSR21V3
Dim. "A" 1" 3-1/2" 2-1/8"
FIGURE 2
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.
G21V ICM2+ INSTALLATION
EMBOSSED ARROW ON
MOTOR MUST POINT UP
ALIGN MOTOR/BRACKET
ASSEMBLY WITH HOLES
IN BLOWER HOUSING
FIGURE 3
Circuit Board and Choke Installation
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.
TYPICAL G21V CIRCUIT BOARD
INSTALLATION AND WIRING
G21V CONTROL BOX
TERMINAL STRIP ROUTE WIRES
THROUGH
STRAIN RELIEF
KIT CIRCUIT /1_
BOARD IBLOWER
HOUSING
FIGURE 4
12-Drill two mounting bracket holes on the blower
housing, See figure 4 for an example.
13-Install circuit board mounting bracket using two
screws (provided).
14-Secure circuit board to mounting bracket with
provided stand-offs.
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
USE 2 SDST SCREWS -I_ _I-
(PROVIDED) TO SECURE /I
D
/
r- t ,-3/,
3-9/16 _'
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
FIGURE 6
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 Jumper Adjustment section for
application specific jumper selections.
,A WARNING
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).
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
KIT CONTROL HARNESS
CONNECT TWO LOOSE
HARNESS TO TERMINALS
CHOKE
FIGURE 7
Motor Replacement
t-
2-
3_
4-
5-
6_
7_
8-
Remove both access panels from unit.
Unplug existing ICM1 motor power harness (P48)
and control harness (P49).
Unplug blower deck harness P98/J98.
Remove green ground wire from blower housing.
Remove 2 blower securing screws and remove
blower assembly.
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.
Page 3
GSR21V ICM2+ INSTALLATION
0.J
DOWNFLOW
ALIGN
MOTOR/BRACKET
ASSEMBLY WITH
HOLES IN BLOWER
HOUSING
EMBOSSED ARROW
ON MOTOR
MUST POINT UP
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,
14-Install two screws, provided, through the flange
and into the bracket to secure, Mount bracket on
side of the flange.
15-Secure circuit board to mounting bracket with
provided stand-ells.
TYPICAL GSR21V & GSR21CV CIRCUIT
BOARD INSTALLATION AND WIRING
\
KIT CIRCUIT /
BOARD /
/
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.
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),
19- install pin terminal end of purple wire into socket
#11 of the blower deck harness jack (J98).
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).
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.
26- Refer to Jumper Adjustment section for
application specific jumper selections,
Page 4
WARNING
Motor Replacement
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,
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
.... /_ ARROW UPFLOW
ON MOTOR
MUST POINT UP
HORIZONTAL
FOR
HORIZONTAL,
PLUG FACES o
ACCESS PANEL _......... --
DOWNFLOW
FIGURE 10
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.
Circuit Board Installation
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
KIT CIRCUIT
BOARD
CB21V
TERMINAL STRIP
/
Y
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),
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
A
USE COPPER CONDUCTORS
ONLY. REFER TO UNIT
RATING PLATE FOR
MINIMUM CIRCUIT
AMPACITY AND MAXIMUM
FUSE 51ZE
NEC/CEC CLASS 2
CONTROL FI
EOUIP
GROUND
ACC
A
ULSCH[HIION
KEY COMPONENT
&3 :ONTROL BURNER
&24 :ONTROL VSP
53 _O_OR BLOWER
_6 _OTOR COMB AIR BLOWER
=I :USE TRANSFORMER.TI
3VI /ALVE GAS
J46 JACK OUTPUT
J48 JACK MOTOR.VAR.SPD
J49 JACK MOTOR,VAR.SPD.
J72 JACK PRIMARY CONTROL
J73 JACK VSP CONTROL
_43 I RELAY ECONOMIZER
LI5 COIL CHOKE
"46 _LUG OUTPUT
"4B "LUG MOTOR,VAR.SPD.
"49 "LUG MOTOR,VAR.SPD.
"72 CONTROL
"73 JLUG VSp CONTROL
51 HERMOSTAT ROOM
510 _W[_CH L[MIT,PR[ GAS
_51 _WITCH DOOR INTERLOCK
572 _W[TCH DIFF. PRESSURE
578 _WITCH MODULATION CONTROL
rl rRANSFORMER CONTROL
rBI ERMINAL STRIP LOW VOLTAGE
FB2 tERMINAL STRIP UNIT
z_CONNECT WIRE TO THE
FUSEHOLDER SPADE ON
BACK SIDE OF LOW
VOLTAGE TERMINAL BOARD.
(OPPOSIDE SIDE OF FUSE
FROM TRANSFORMER BLUE
LEAD.)
72
• P72
GVI
z_ IHP MOTOR [V5 UNIT5) _2)
LI3 WIRED AS SHOWN.
MOTOR KIT COMPONENTS
DESCRIPTION
_FY COMPONFNTS
_53 ]ONTROL JP61 SPEED £ELECTOF
1£5 JACK JPBI SPEED SELECTOR
J96 JACK OPBI POWER INTERFACE
J97 JACK JPBI/B5 INTERFACE
_95 JLUG JPBI SPEED SELECTOR
"96 PLUG JPBI PO#ER INTERFACE
P97 "LUG JPBI/B5 INTERFACE
--LINE VOLTABE FIELD WIRING
CLASS [[ VOLTAGE FIELD INSTALLED
B3
_OENOTES OPTIONAL COMPONENTS
EXISTING WIRE
(PIGGY BACK TO ORANGE KIT WIRE) _ _._
ORANGE KIT WIRE
(WITH PIGGY BACK CONNECTION)_
i!
H
BLUE WIRE TO
TRANSFORMER
BACK OF TERMINAL STRIP
FIGURE 12
TERMINALS ON BACK OF FUSE
Page 6
TYPICAL GSR21V ICM2+ WIRING DIAGRAM
A
USE COPFER CONDUCTORS
&'e..Y.REFER TO UNIT
RATINS R.AII_FOR
QINII/AJMCIRCUIT
AMPACITY AND MAXIli_Id
FUSE SIZE
NEC/CEC CLASS 2
CONNECT WIRE TO WIR_
NUT CONTAININO WIDE
FUSE HOLDER.
CONTAINS
Ut_ITE.)
FI
S,OA
TypEI
MEX
V
ONOONDEQUIP/.'_,K43
JACK-MOTOR•VAR.SPD.
JACK-BLOY4ERDECK
A¥-
El0 K43-1 521 JON
SZl 15 AUTO RESET ON
UNITS ONLY,
2 NOTE-JP98 IS LDEATEI
J72 ON BL(7_ZR DECK A24
THIS WIRE NOT tPSED
ON JOHNSONBURNER
CONTR(JL
_,P7Z
MOTORNIT COMPONENTS
LINE VOLTADE FIELD IIRIN6
-- -- CLASS II VOLTAGE FIELD WIRINS
P
[] ECON
_.COOL 2Y2
S7B
_}__ON___ YI
PLACE OUTDOORUNIT
AND/ON TEMPERATLJI_
CONTROLDI ABRAM
DEDE,
WIRE IS FIELD INSTALLED IN
,_ SOCKET ,II OF BLOWER DECK
PLON & JACK(_.JON).WIDE
15 PROVIDED IN THE MOTOR
REPLACEMENT KIT.
Z_ FIELD INSTALLED WIRE
IN OPEN SOCKETOF PAD
iPLUG {EITDER '3 ON '6}
PROVIDEDWITH BLOWER
MOTORREPLACEMENTKIT.
24V
LCmae}N c
/397
0000
B3
BLUE WIRE TO TRANSFORMER
BACK OF FUSE
ON TERMINAL
STR,P
WIRE NUT BUNDLE
P98
_ _ LOCATED AT
BLOWER DECK
_ BLUE KIT WIRE
(CONNECT TO WIRE NUT BUNDLE
AND TO POSITION #11 IN P98)
FIGURE 13
Page 7
TYPICAL GSR21CV ICM2+ WIRING DIAGRAM
P?(/ 2
170 3
(}FI PTO B
FIGURE 14
Page 8
TYPICAL CB21/B21-41 & CB21/B21-51/65 ICM2+ WIRING DIAGRAM
J2
> '
5
EQUIP
GROUND
CIRCUIT I
Z_ CBB
LI
L2_
(EY
_15
CB21 13
SERIES :B5
:I
J_5
J46
J4B
JAB
(20_ I,_
J2
_46
_48
rl
rBl
FIELD WIRING FOR ECB21 FIELD WIRING FOR ECB21
UNITS WITHOUT CIRCUIT BREAKERS UNITS WITH CIRCUIT BREAKERS
C[RCUITLI
CIRCUIT 4 CIRCUIT _ CIRCUIT 2
CBB
A A A co_A A c°'A
LI _ ,,_I__/T_ z_ LI _/T _-
L2 L2 _2 L2 _
_L3 _ AL3...,_ AL__A
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.
A REFER TO FACTORY BLOWER SPEED TAP SELACT[ON
Z_ CHART ON UNIT FOR BLOWER SPEED iNFORMATION
Z_ USE COPPER CONDUCTORS ONLY. REFER TO UNIT ECBBI
NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY SERES
ANO MAXIMUM OVERCURRENT PROTECTION 51ZE
B3
Z_ EQUIPMENT GROUND :
LOCATED IN INDOOR A THE NUMBER OF CIRCUITS VARY
UNIT _ACCOROINB TO HEATER MOOEL.
REFER TO FAN COiL NAMEPLATE
FOR ACTUAL NUMBER EMPLOYEO
FI
2#V POWER
II BLOWER
Ao×MEAT,
z_ _ _ AGX HEAT 2
A _ A
R
1
05
G
WI
W2
• AF4_ C°°L/BEAT2
m_Oj_ _ REV VALVE
(I_ LqE]_ COOL/HEATI
J4B
J4E
49
1P97
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
RELAY BLOWER
JACK ELECT. HEAT
PLUG iNPUT
"LUG OUTPUT
"LUG MOTOR_VAR BPD
"LUG MOTOR,VAR BPO
TRANSFORMER CONTROL
TERM STRIP CLASS ]I VOLT
Y2
O
YI
_ WHEN TWO SPEED THERMOSTAT IS USED,CONNECT
L_ SECOND STAGE HEAT BULB TO TERMINAL "W2" AND
REMOVE JUMPER BETWEEN TERMINALS "R" & "W2"
WHEN OUTDOOR THERMOSTAT IS USEO,CONNECT LEADS/x
_TO TERMINALS "R" AND "WB" AND REMOVE JUMPER
CONNECT JUMPER BETWEEN "YI & "YB"
WHEN CBBI 15 MATCHEO WITH CONOENS[NB
A
_ UNIT, CONNECT JUMPER BETWEEN "R" & "0"
WHEN HUMIO[TY CONTROL {ABO] [5 NOT USEO IN
A COMBINATIO WiTH TWO 5PEEO COMPRESSOR,
CONNECT JUMPER BETWEEN "Y2" ANO "OS"
A WHEN HUMIOITY CONTROL [A20) [5 NOT UBEO iN
COMBINATION WITH SINGLE SPEED COMPRESSOR,
CONNECT JUMPER BETWEEN "YI" AND "05"
--LINE VOLTAGE F[ELO WIRING
CLASS [i VOLTAGE FIELO WIRING BAV
COMMON
CB21 SERIES
MOTOR KiT COMPONENTS
DESCRIPTION
(EY COMPONENT5
k53 CONTROL JPBI SPEED SELECTOR
J95 JACK JPBI 5PEEO SELECTOR
Jg6 POWFR [NTFRFARF
J97 JACK JPBI/B3 INTERFACE
_95 PLUG JPBI 5PEEO SELECTOR
_96 PLUG JPBI POWER iNTERFACE
J97 _LUG JPBI/B3 INTERFACE
LENNOX_o.,.o._°o. W[RiNGOiAGRAMIg/g3
COILS BLOWER COIL UNITS
C821 41,51,65 IP
CBH21 41 IP 821 51,65 IP
WITH MOTOR KIT
COIL SECTION 1846
£up_r_d_ Form N_ N_w F_rm N_
529,854W
@1993 Lannox Industrlas Inu Lilh¢ U.S.#
FIGURE 15
Page 9
"ADJUST"
TheADJUSTpinsallowthe motorto runat normal
speed,approximately10%higher,or approximately
10%lowerthannormalspeed.Table9givesthreerows
( +, NORMAL,and -) with their respectiveCFM
volumes.Noticethatthenormaladjustmentsettingfor
heatspeedposition#3 is2000CFM,The+ adjustment
settingfor that positionis 2180CFMandfor the -
adjustmentsettingis 1800CFM.Aftertheadjustment
settinghasbeen determined,chosethe remainder
speedjumpersettingsfromthoseofferedinthetable.
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. G must be energized
for motor to run.
"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
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
terminal strip. Doing so will activate the low speed
jumper setting when W1 is energized. The heat speed
is not operable on GSR21CV units.
"HIGH"
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.
"LOW"
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.
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 jumper position
determines the speeds available,
"A53" JPB1 KIT BLOWER BOARD
S _, ADJUST HEAT
TE_ST 2
1
HIGH LOW
P95
/
J95
FIGURE 16
Page lO
TABLE 2
G21V3 and GSR21V3 SERIES UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(ForStaticPressure0.0" to 0.8"w.g.)
ORIGINAL ORIGINAL CIRCUIT BOARD ADJUSTMENT
MOTOR MOTOR JUMPER JUMPER
SPEED TAP APPROXk POSITION POSITION
POSITION MATE CFM
2 490 LOW 1" NORM
3 635 LOW 2* NORM
4 760 LOW 3* NORM
5 880 LOW 4* NORM
6 1030 HEAT 1 /HIGH 1 NORM
7 1140 HEAT 2 /HIGH 2 NORM
8 1220 HEAT 3 /HIGH 3 NORM
9 1345 HEAT 3 /HIGH 3 "+"
10 1420 HEAT 4 /HIGH 4 "+"
11 1420 HEAT 4/HIGH 4 "+"
*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 UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(For Static Pressure0.0" to 0.8" w.g.)
ORIGINAL ORIGINAL CIRCUIT BOARD ADJUSTMENT
MOTOR MOTOR JUMPER JUMPER
SPEED TAP APPROXl- POSITION POSITION
POSITION MATE CFM
2 770 LOW 1" NORM
3 1015 LOW 2* NORM
4 1305 LOW 3* NORM
5 1510 LOW 4* NORM
6 1685 HEAT 2 /HIGH 2 "-"
7 1820 HEAT 2 /HIGH 2 NORM
8 2010 HEAT 2 /HIGH 2 "+"
9 2050 HEAT 3 /HIGH 3 NORM
10 2100 HEAT 3 /HIGH 3 NORM
11 2100 HEAT 3 /HIGH 3 NORM
*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 4
GSR21CV5 SERIES UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(For Static Pressure O.O"to 1.2" w.g.)
ORIGINAL ORIGINAL CIRCUIT BOARD ADJUSTMENT
MOTOR MOTOR JUMPER JUMPER
SPEED TAP APPROXI- POSITION POSITION
POSITION MATE CFM
2 905-1020 LOW 2 NORM
3 945-!030 LOW 2 NORM
4 1170-1330 LOW 3 NORM
5 1345-1500 LOW 4 /HIGH 1 NORM
6 !510-1700 HIGH 2 "-"
7 1700-1850 HIGH 2 NORM
8 1885-2000 HIGH 2 "+"
9 2010-2100 HIGH 3 NORM
10 2000-2200 HIGH 4 NORM
11 2000-2200 HIGH 4 NORM
*HEAT is not used on GSR2 I CV units.
TABLE 5
CB21V/CBH21V-41 SERIES UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(For Static Pressure 0.0" to 0.6" w.g.)
ORIGINAL ORIGINAL CIRCUIT BOARD ADJUSTMENT
MOTOR MOTOR JUMPER JUMPER
SPEED TAP APPROXk POSITION POSITION
POSITION MATE CFM
1 676 LOW 1 NORM
2 750 LOW 1 NORM
3 850 LOW 2 NORM
4 926 LOW 3 NORM
5 1025 LOW 4 /HIGH 1 NORM
6 1125 HEAT I /HIGH 2NORM
7!225 HEAT 2 /HIGH 3 NORM
8 1325 HEAT 3 /HIGH 3 NORM
9 1400 HEAT 4 /HIGH 4 NORM
10 !550 HEAT 4/HIGH 4 "+"
11 1550 HEAT 4/HIGH 4 "+"
TABLE 6
CB21V /CBH21V /B21V-51/65 SERIES UNITS
ICM1 SPEED TAP TO ICM2+ JUMPER SELECTIONS
(For Static Pressure O.0" to 0.6" w.g.)
ORIGINAL ORIGINAL CIRCUIT BOARD ADJUSTMENT
MOTOR MOTOR JUMPER JUMPER
SPEED TAP APPROXk POSITION POSITION
POSITION MATE CFM
1 750 LOW 1 NORM
2 850 LOW 1 NORM
3 950 LOW 2 NORM
4 1150 LOW 3 NORM
5 1300 LOW 4 NORM
6 !500 HEAT 1 /HIGH 1 NORM
7 1650 HEAT 2 /HIGH 2 NORM
8 1800 HEAT 3 /HIGH 3 NORM
9 !950 HEAT 4/HIGH 4 NORM
10 2100 HEAT 4/HIGH 4 "+"
11 2100 HEAT 4/HIGH 4 "+"
Page 11
TABLE 7
G21V3-60/80 ICM2+ BLOWER MOTOR PERFORMANCE
(For Static Pressure 0.0" to 0,8" w.g.)
ADJUST LOW SPEED HIGH (COOL) SPEED HEAT SPEED
JUMPER JPB1 JUMPER POSITION JPB1 JUMPER POSITION JPB1JUMPER POSITION
SETTING 123412341234
+ 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", "+", or "-") determines the row of CFM available to use.
TABLE 8
GSR21V3-80 ICM2+ BLOWER MOTOR PERFORMANCE
(For Static Pressure 0.0" to 0.8" w.g.)
ADJUST LOW SPEED HIGH (COOL) SPEED HEAT SPEED
JUMPER JPB1 JUMPER POSITION JPB1 JUMPER POSITION JPB1 JUMPER POSITION
SETTING 123412341234
+ 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 the row of CFM available to use.
TABLE 9
G21V5-80/100 ICM2+ BLOWER MOTOR PERFORMANCE
(For Static Pressure 0.0" to 0,8" w.g.)
ADJUST LOW SPEED HIGH (COOL) SPEED HEAT SPEED
JUMPER JPB1 JUMPER POSITION JPB1 JUMPER POSITION JPB1JUMPER POSITION
SETTING 123412341234
+ 800 1050 14!0 1620 1710 2030 2270* 2270* 1900 2140 2270* 2270*
NORM 720 950 1280 1500 1570 1850 2100 2220 1700 1940 2080 2200
620 850 1120 1310 1420 1650 1860 !990 1520 1730 1860 1940
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 10
GSR21V5-80/100 ICM2+ BLOWER MOTOR PERFORMANCE
(For Static Pressure 0.0" to 0,8" w.g.)
ADJUST LOW SPEED HIGH (COOL) SPEED HEAT SPEED
JUMPER JPB1 JUMPER POSITION JPB1 JUMPER POSITION JPB1JUMPER POSITION
SETTING 123412341234
+ 860 1100 1460 1740 1800 2090 2100- 2100- 1930 2100- 2100- 2100-
NORM 770 1020 1390 1580 1720 1990 2100" 2100" 1800 2000 2100" 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 to use.
*2200 CFM @ 0.2" w.g.; 2100 CFM @ 0.5" w.g.; 2000 CFM @ 0.8" w.g.
Page12
ADJUST
JUMPER
SETTING
NORM
STATIC
1.2
1.0
0.5
1.2
1.0
0.5
1.2
1.0
0.5
TABLE 11
GSR21CV5-80/100 ICM2+ BLOWER MOTOR PERFORMANCE
(For Static Pressure O.O"to 1.2" w.g.)
LOW SPEED
JPR1 JUMPER POSITION
123 4
750 1080 1440 1670
790 1090 1450 1660
840 1130 1460 1640
680 940 1340 1510
700 960 1350 1510
750 1030 1360 1520
590 790 1160 1330
610 830 1180 1350
670 900 1200 1360
HIGH (COOL) SPEED
JPB1 JUMPER POSITION
1 2 3 4 1
1790 2000 2000 2000
1800 2080 2070 2080
1770 2100 2230 2210
1490 1870 2020 2000
1500 1880 2110 2070
1500 1840 2130 2220
1410 1670 1920 1980
1420 1660 1940 2010
1440 1640 1920 2010
HEAT SPEED
JPB1 JUMPER POSITION
2 3 4
NOTE: HEA Tspeed tap is not used on GSR21CV units. ADJ USTposition on JPB 1( "NORM", "+" or "-') determines the row of
CFM available to use.
TABLE 12
CB21V-41 AND CBH21V-41 BLOWER PERFORMANCE
(Operating at 0.00 through 0,60 in. w.g. External Static Pressure)
ADJUST LOW SPEED HIGH (COOL) SPEED HEAT SPEED
JUMPER JPB1 JUMPER POSITION JPB1 JUMPER POSITION JPB1JUMPER POSITION
SETTING 123412341234
+ 850 950 1060 1!50 1150 1250 1490 !600 1230 1346 1480 1600
NORM 750 850 950 1025 1025 1125 1325 !425 1125 1225 1325 1425
650 730 830 900 900 1000 1190 !260 980 1080 1190 1260
NOTE: ADJUST position on BDC-2 ("NORM'; "+", or "-") determines the row of CFM available to use.
TABLE 13
CB21V-51, CBH21V-51, CB21V-65, CBH21V-65 AND B21V-51/65 BLOWER PERFORMANCE
(Operating at 0,0O through 0.60 in. w.g. External Static Pressure)
ADJUST LOW SPEED HIGH (COOL) SPEED HEAT SPEED
JUMPER JPB1 JUMPER POSITION JPB1JUMPER POSITION JPB1JUMPER POSITION
SETTING 123412341234
+ 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
750 850 1026 1!10 1350 1485 1560 !760 1340 1480 1630 1760
NOTE: ADJUST position on BDC-2 ("NORM _, "+", or "-") determines the row of CFM available to use.
Page13
Tocheck-outtheICM2+refertofigure17andfollowthe
check-outprocedureasoutlined.Iftheblowerfailsany
of thesetests,donotattemptto repairthemotor.
Therearenofieldserviceablepartsinthiscomponent.
Replacethemotorandrepeatthecheck-outprocedure,
ICM2+ 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 unit back in operation.
CHECK-OUT PROCEDURE
1 2 3 4 5 6 7 8 9 10 11
ICM2+ LOW SPEED CHECK-OUT
1- Disconnect power to unit.
2- Disconnect 11 pin plug located on JPB1.
3- Connect voltage source as shown above.
4- Turn on power to unit. Blower should
operate at low speed.
1 2 3 4 56 7 8 9 10 _1
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.
12345678 9 10 11
wn above.
r should
o e,a eed
FIGURE 17
Page 14

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