Lennox G21Q Series Unit Information

TABLE 8
G21Q/GSR21Q BLOWER RATINGS
120V 1PH
BLOWER MOTOR HP
Q3
Q4
Q5
CAP
3/4
1/2
1/3 5MFD 370V
7.5MFD 370V
40MFD 370V
Page 29
O − Blower Motors and Capacitors
(Q" Units)
All G21/GSR21 Q"
units use direct drive
blower motors. All Q"
motors are 120V per
manent split capacitor
motors to ensure maxi
mum efficiency. See
table 8 for ratings. Multispeed Q" blower motors are factory
wired for low speed (red tap) heating, GSR21Q380 units are
wired for medium speed (yellow) tap heating. See table 9.
1 − Blower Speed Taps Q" Units
Leadless Motors Only
Some G21/GSR21 "Q" units will be equipped with lead
less blower motors. Blower speed tap selection on lead
less motors is accomplished by changing taps on the
blower motor harness connector. Disconnect harness
connector from motor to expose speed selectors. See
table 9 for leadless motor blower speed selection.
BLOWER SPEED SELECTION LEADLESS MOTORS
Q340, Q360
UNIT
Factory Connected
Speed Taps
Motor Speeds
Available
Cool Heat
4
3
3
24 4
65
BLOWER SPEED SELECTION
HI LOW
2345
23456
SPEE
D
4
5
TABLE 9
Q380
Q3100
Q4/5, Q5
TAPS
54Q4
234 3
TABLE 10
To Change Blower Speed Q" Units With
Leadless Motors Only:
1 − Turn off electric power to furnace.
2 − Lift left side filter over left support angle. For easy han
dling, hold filter at center bottom.
3 − Grasp blower motor harness connector located on
back of motor. Depress lock tab and pull connector
from motor.
4 − Pull harness connector and wires through blower ac
cess panel opening.
5 − Select desired heating and cooling speeds.(Red=
heating, Black=cooling, White=common). See table
9.
6 − Depress harness connector tab to release wire termi
nal. Select connector location for new speed (refer to
unit wiring diagram). Insert wire terminal until it is se
curely in place. See figure 32.
7 − Replace harness connector to motor.
BLOWER SPEED TAP SELECTION Q"
HARNESS
CONNECTOR
MOTOR
DEPRESS TAB TO RELEASE
WIRE TERMINAL. SELECT CON
NECTOR LOCATION FOR NEW
SPEED (REFER TO UNIT WIR
ING DIAGRAM). INSERT WIRE
UNTIL IT IS SECURELY IN
PLACE.
FIGURE 32
2 − Blower Speed Taps Q" Units
leaded Motors Only
G21/GSR21"Q"−9 models will be equipped with leaded mo
tors. Blower speed tap selection on leaded motors is ac
complished by changing speed taps. Speed taps are lo
cated in the control box. Simply remove control box cover
and disconnect current tap, then rewire tap selected. See
table 10 for color coded speed taps.

Lennox G21Q Series Specifications

General

Brand	Lennox
Model	G21Q Series
Category	Industrial Equipment
Language	English