Lennox G23Q3-100 User Manual

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To Remove Blower:
1. Turn off line voltage power.
Unplug J 69 from P69 located
on blower deck.
2. Disconnect thermostat wiring
connections by removing low
voltage terminal strip.
3. Disconnect J20/P20 located on
blower deck.
4. Disconnect J43/P43 from blow-
er motor.
5. Loosen screws (2) and remove
control box from unit. Holes
are slotted so screws do not
need to be removed.
6. Remove screws (2) and re-
move blower from unit.
FIGURE 38
G23(X) BLOWER REMOVAL
4
5
2
6
3
1
5
D-Blower Speed Taps Leadless Motors
(-1, -2, -3 and -4 Models)
Blower speed tap selection is accomplished by changing the
taps at the blower motor harness connector. Disconnect har-
ness connector from motor to expose speed selectors.
Blower speed selections are listed in table 20.
To Change Blower Speed:
1 - Turn off electric power to furnace.
2 - Remove blower access door. See figure 1.
3 - Disconnect blower motor harness from motor.
4 - Pull harness connector and wires through blower ac-
cess panel opening.
5 - Select desired speeds for heatingand cooling. (Red =
heating, Black = cooling, White = common). See table
20.
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 39.
7 - Replace harness connector to motor .
TABLE 20
FIGURE 39
DEPRESS TAB TO RELEASE
WIRE TERMINAL. SELECT CON-
NECTOR LOCATION FOR NEW
SPEED (REFER TOUNIT WIRING
DIAGRAM). INSERT WIRE UNTIL
IT IS SECURELY IN PLACE.
MOTOR
HARNESS
CONNECTOR
BLOWER SPEED TAP SELECTION
LEADLESS MOTORS
*
NOTE-Q3(X)-100 furnaces use a 4 tap motor with low
speed permanently blocked off so it cannot be used. Do
not attempt to operate unit on low speed tap.
E-Blower Speed Taps Leaded Motors
-5 and -6 Models
Blower speed tap chan
g
es are made on the SureLi
g
ht
control board. See fi
g
ure 21. Unused taps must be se-
cured on dumm
y
terminals ”PARK M1” and or ”PARK M2”
on the SureLi
g
ht board. The heatin
g
tap is connected to
the”ACB HEAT ”terminalandthe coolin
g
tapis connected
to the ”ACB COOL” terminal. The continuous blower tap is
connected to the ”ACB LOW” terminal.
To chan
g
e existin
g
heat tap, turn off power then switch out
speed tap on ”ACB HEAT” with tap connected to ”PARK
M1” or ”PARK M2”. See table 21 for blower motor tap col-
ors for each speed.

Lennox G23Q3-100 Specifications

General

Brand	Lennox
Model	G23Q3-100
Category	Furnace
Language	English