Lennox G21Q Series Unit Information

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IV − SEASONAL MAINTENANCE
At the beginning of each heating season, the system
should be checked as follows:
A − Supply Air Blower
1 − Check and clean blower wheel
2 − Motor Lubrication− Always lubricate the blower motor
according to the manufacturer’s lubrication instruc
tions on each motor. If no instructions are provided, use
the following as a guide:
a − Motors without oiling ports  Prelubricated and sealed
no further lubrication needed.
b − Direct drive motors with oiling ports  Prelubricated for
an extended period of operation and do not require
additional oil for normal use.
B − Filters
1 − Filters must be cleaned or replaced when dirty to as
sure proper unit operation. Clean as necessary.
2 − The filters supplied with the G21/GSR21 can be
washed with water and mild detergent. When dry, they
should be sprayed with Filter Handicoater before rein
stalling in the unit. Filter Handicoater is RP Products
coating no. 418 and is available from Lennox Repair
Parts (No. P85069).
C − Fan Controls & Limit Controls
Check fan and limit controls for proper operation and set
ting. For settings, refer to the sections on the VSP2 Blower
Control Board, Fan Timing Control A28 and Limit Control/
Modulation Limit Control in this manual.
D − Purge Blower
Periodically inspect and clean purge blower wheel.
1 − Disconnect power to the unit.
2 − Remove upper heating compartment access panel.
3 − Remove air decoupler box cover.
4 − Remove wires that power purge blower.
5 − Remove screws holding purge blower housing together.
6 − Check and clean blower wheel.
7 − Reassemble in reverse order.
E − Intake/Exhaust Lines
Check intake and exhaust PVC lines and all connections
for tightness and make sure there are no leaks or blockage.
Also check condensate line for free flowing operation and
complete drainage.
F − ELECTRICAL
1 − Check all wiring for loose connections.
2 − Check for correct voltage.
3 − Select fuse and wire size according to blower motor
amps.
4 − Access openings are provided on both sides of cabinet
to facilitate wiring.
5 − Install room thermostat according to instructions pro
vided with thermostat.

Lennox G21Q Series Specifications

General

Brand	Lennox
Model	G21Q Series
Category	Industrial Equipment
Language	English