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FIGURE 4
MANUAL MAIN
SHUT-OFF VALVE
GROUND
JOINT
UNION
DRIP LEG
GAS CONNECTOR
RIGHT SIDE PIPING
AUTOMATIC
GAS VALVE
GAS PIPING
FIGURE 5
FOR UNIT TO
OPERATE DISCONNECT
SWITCH MUST
BE IN ON" POSITION
TYPICAL
FUSE/DISCONNECT
SWITCH BOX MOUNTED
ON FURNACE
Servicing the Filter
Inspect and clean air filters each month. Filters must
be cleaned when dirty to assure proper furnace opĆ
eration and maintain efficiency.
A-Cleaning Reusable Foam Filter
1- Turn off electrical power to furnace.
2- Remove blower access panel. Wait for blower to stop.
3- Remove filter by sliding up and out of channel.
4- Wash filter with water and a mild detergent. For inĆ
creased efficiency, filter media should be sprayed with
Filter Handicoater when dry. Filter Handicoater is RP
products No. 418 and is available as Lennox part No.
P-8-5069. See table 1 for replacement filters.
TABLE 1
G21 Model No.
Filter Size
Filter Part
No.
All Q-40,-60,
Q3-80, Q4-80 and
V3-60, -80 units
16" x 25"
(406 x 635mm)
P-8-7822
Q5-80 and all
Q-100 units: and
V5-80,-100 units
20" x 25"
(508 x 635mm
)
P-8-7831
5- Reinstall filter. Slide filter into top channel and drop
into lower channel.
IMPORTANT-Do not replace foam reusable filters
with throw-away type filters.
6- Replace blower access panel.
Lubrication
Motors are prelubricated for extended bearing life; no
further lubrication is required.
Service
At the beginning of each heating season, the system
should be checked as follows:
1- Examine the termination ends of the intake and exĆ
haust lines for obstructions or blockages.
2- Check the intake and exhaust lines for holes, sagĆ
ging or broken isolation hangers. If a sag is found in
either line, raise the line and support it with an isolaĆ
tion hanger. Replace any damaged isolation hangĆ
ers.
3- The return air duct connection should be sealed to
the furnace casing and terminate outside the space
containing the furnace.
4- Check the physical support of the furnace. It should
be sound without sagging, cracks, gaps, etc., around
the base so as to provide a seal between the support
and the base.
5- Check that there is no obvious signs of deterioration
of the furnace.
6- Inspect and clean condensate drain system for free
flow of condensate.
IMPORTANT-If a change in the sound level of the unit
is detected or there is evidence of condensate leakĆ
age around the unit, contact your Lennox service
technician.
