Lennox International Inc. GSR21Q - Manual (Page 4)

3DJH 
THERMOSTATS
FIGURE 3
7- On Robertshaw 7200 gas valve, depress lever on
gas control and move to ON and release. For White
Rodgers 36E gas valves, move switch to ON.
8- Replace unit access panel.
9- Turn on all electrical power to unit.
10- Set thermostat to desired setting. See figure 3.
11- If the furnace will not operate, follow the instructions
“To Turn Off Gas To Unit” and call your service techni-
cian or gas supplier.
B-To Turn Off Gas To Unit
1- Set thermostat to lowest setting. See figure 3.
2- Turn off all electrical power to unit if service is to be
performed. See figure 4.
3- Remove heat section access panel.
4- On Robertshaw 7200 gas valve, depress lever on
gas control and move to OFF and release. For White
Rodgers 36E gas valves, move switch to OFF.
5- Replace unit access panel.
FIGURE 4
FOR UNIT TO
OPERATE DISCONNECT
SWITCH MUST
BE IN “ON” POSITION
TYPICAL
FUSE/DISCONNECT
SWITCH BOX MOUNTED
ON FURNACE
FIGURE 5
GAS PIPING
HORIZONTAL APPLICATION
GROUND
JOINT UNION
MANUAL MAIN
SHUT--OFF VALVE
GAS
CONNECTOR*
GAS VALVE
UNIT
REAR PANEL
MANUAL MAIN
SHUT--OFF VALVE
GAS CONNECTOR*
GAS VALVE
GROUND JOINT
UNION
GAS PIPING
DOWNFLOW APPLICATION
*Gas connector may be
used
for Canadian
installation if acceptable
by local authority having
jurisdiction.
6(59,&,1* ),/7(5
Inspect and clean air filters each month. Filters must
be cleaned when dirty to assure proper furnace op-
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 in-
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. If replacement filters is needed,
use Lennox part no. P-8-7831 for 20” x 25” (508 x
635mm) filter.
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.