General; Installation--Setting And Leveling Equipment; Return Air Opening Guidelines - Lennox G21Q Series Installation Instructions Manual

GENERAL

A - - Shipping Damage
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
NOTE - - Special care should be taken to check the align-
ment of the gas piping at the point it penetrates the ves-
tibule panel. Inspect the rubber grommet for damage.
There must be no direct contact between the gas pipe
and the vestibule panel.
B - - Shipping and Packing List
1 - - Assembled G21Q furnace
1 - - Filter
1 - - Bag assembly containing:
1- -Drip leg assembly
1- -Exhaust pipe
1- -Pipe plug
1- -Gas connector
4- -Anti- -vibration pads
1- -Reducing tee
1- -Filter rack
1 - - Bag assembly containing:
1- -1/2” dia. CPVC pipe nipple (2” long)
1- -Snap bushing (3/8” opening)
1- -Snap bushing
2- -Filter clips
2- -Snap hole plugs
1- -Rubber grommet
1- -Button plug
C - - Shipping Bolt Removal
Remove four heat section shipping bolts from the bot-
tom of the blower deck before starting unit. Access the
bolts through the blower compartment.
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser-
vice must be performed by a qualified installer,
service agency or the gas supplier.
INSTALLATION - - Settin
When the unit is installed where freezing temperatures
are possible, the condensate trap and the condensate
line must be protected by a grounded and sheathed
self- -regulating heating cable and insulation. The con-
densate trap must be accessible for servicing and the
unit must be level to ensure proper drainage from the
coil. Heating cable is available from Lennox in various
lengths: 6ft. (1.8m) - - kit no. 18K48; 24ft. (7.3m) - - kit no.
18K49; and 50ft. (15.2m) - - kit no. 18K50. The heat cable
kit may be used on the exhaust pipe and vent termina-
tions to prevent freezing.
g & Leveling Unit
1 - - Holes are provided in the corners of unit base for
leveling unit. Install leveling bolts (if desired as
shown, or shim under unit. See figure 2.
2 - - Set unit in desired location keeping in mind clear-
ances listed on unit rating plate. Also keep in mind
gas supply connection, electrical supply, vent con-
nections and clearances for installing and servic-
ing unit.
If leveling bolts are used, be sure to install the plas-
tic nuts as shown and tighten snugly before set-
ting unit.
LEVELING BOLT INSTALLATION
AFTER UNIT IS LEVEL,
CABINET
SIDE
INSTALL PLASTIC
NUTS WITH FLAT SIDE
TOWARD BASE.

RETURN AIR OPENING GUIDELINES

Return air can be brought in either side or bottom of unit.
Scribe lines show the outline of each return air opening.
Remove remaining insulation from around return air
opening. See figure 3.
G21Q UNIT
ISOLATION
PADS
NOTE - - Insulation adhesive is only used inside of
scribe lines.
NOTE - - Units with Q4, Q4/5 and Q5 blowers use larger
opening.
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CAUTION
TIGHTEN THIS NUT
BASE
WITH THIS NUT
LEVELING BOLT
FIGURE 2
BOTTOM RETURN
AIR APPLICATION
RETURN AIR
PLENUM
FIGURE 3
UNIT
LEVEL UNIT