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G − Condensate Line (Figure 45)
TYPICAL HEAT WRAP INSTALLATION
ALUMINUM FOIL TAPE
1" INSULATION
HEAT CABLE
(1 WRAP PER FOOT)
PVC OR PVC PIPE
FIBERGLASS TAPE
(WRAP AROUND PIPE 1 1/2 TIMES)
HEAT CABLE WRAP PROCEDURE
HANDY BOX
(FIELD PROVIDED)
WATER TIGHT
CONNECTOR
MOUNTING
BRACKET
HEAT
CABLE
CONDENSATE
TRAP
TYPICAL HEAT CABLE INSTALLATION
CLAMP
CLAMP
FIGURE 45
When installing the unit in areas subjected to freezing tem
perature, the condensate trap and condensate line must be
wrapped with electrical heat cable to prevent the conden
sate from freezing. A heat cable kit, which is approved for
use with PVC pipe is available from Lennox Repair Parts.
Refer to G21/GSR21 heat cable kit installation instructions
for proper application.
H − Gas Supply Piping Centered In Inlet
Hole (Figure 46)
The gas supply pipe should not rest on the unit cabinet. See
figure 46. The gas supply connector should be hung as
shown in figure 47.
MANUAL MAIN
SHUT OFF VALVE
GROUND JOINT
UNION
DRIP LEG
GAS VALVE
GAS CONNECTER
MOUNTED
EXTERNALLY
LEFT SIDE PIPING
GROUND
JOINT
UNION
MANUAL MAIN
SHUT OFF VALVE
DRIP LEG
GAS VALVE
UNIT REAR PANEL
GAS PIPING
−
FIGURE 46
GAS CONNECTORA.G.A. UNITS ONLY
RIGHT
WRONG
FIGURE 47
WARNING
The flexible gas connector (if used) must be
mounted external to the unit. The connector must
hang freely and must not contact or rub outside
objects. The flexible connector must not enter the
unit. See figure 46.
I − Muffler
All G21/GSR2180/100 units require the use of mufflers. Muf
flers are optional on all other units and recommended.
IMPORTANT
Any time an exhaust muffler is used in areas sub
jected to freezing temperature, a heat cable kit
must be used on the muffler to prevent conden
sate from freezing.
Use only Lennox heat cable kits which are approved for use
with PVC pipe.
J − Exhaust Insulation
In areas subject to freezing temperature, exhaust pipe must be
insulated with 1/2" Armaflex or equivalent when run through
unconditioned space. In extreme cold climate areas, 3/4" Ar
maflex insulation is recommended.
K − Isolation Hangers (Figure 48)
PVC piping for intake and exhaust lines should be sus
pended (supported) from hangers every five feet. A suit
able hanger can be fabricated from a 1" wide strip of 26
ga. metal covered with Armaflex" or equivalent. See fig
ure 48.
SHEET METAL
SHEET METAL
STRIP
REFRIGERATION
PIPING INSULATION
NOTE−ARMAFLEX IS NOT COMPRESSED BY MOUNTING HARDWARE.
STRAPPING
ISOLATION HANGER
FIGURE 48
