
GAS UNITS
KITS AND ACCESSORIES
@1997 Lennox Industries Inc, 503,289M
Dallas, Texas 2/97
Supersedes 7/96
_j_ Technical
_L Publications
Utho U.S.A,
HEAT CABLE KIT
INSTALLATION INSTRUCTIONS FOR HEAT CABLE KIT (LB--88643A, B & C) USED
WITH G21, GSR21, G26, GHR26 AND COMPLETEHEAT SERIES UNITS
Package 1 of 1contains:
1 - - Heat cable
Heat cable kit protects drip leg assembly, condensate
line, flue pipe and vent terminations when the unit is
installed in unconditioned spaces where freezing is
possible. When installed as outlined in manufacturer's
instructions, the heat cable will protect PVC and CPVC
lines from freezing without causing damage to pipes. The
heat cable is 120VAC pro-assembled self-regulating
electric cable. There are three heat cable kits available in
6 ft., 24 ft. and 50 ft. lengths (excluding 30" long cord set).
Fiberglass and aluminum tape are needed for each
installation. Table 1 lists all kits available from Lennox.
TABLE 1
DESCRIPTION LB--NUMBER CAT, NUMBER
6F]_ HEAT CABLE KIT LB- -88643A 26K68
24 FT HEAT CABLE KIT LB- -88643B 26K69
50 FT HEAT CABLE KIT LB- -88643C 26K70
66 FT FIBERGLASS TAPE KIT LB--56532DA 39G04
60 FT ALUMINUM FOILTAPE KIT LB--56534DA 39G03
NOTE - - Before installing heat cable kit, installer must
provide a 120V power source with cithara circuit breaker
or fuse suitable for handling required cable length. Do
not use an extension cord to reach the receptacle. For
additional safe_ a ground-fault pretection device should
be installed. See heat cable manufacturer's installation
instructions.
See table 2 to determine the length of heat cable needed
for specific run of PVC or CPVC pipe.
TABLE 2
LENGTH OF PIPE COVERED FOR
LENGTH OF HEAT CABLE
PIPE SIZE 6 FT. 12 F3_ 18 FT. 24 FT. 50 FT. 100 FT.
O.SlN. I 6 I 12 I 18 I 24 I 50 I 100
RUN CABLE STRAIGHT tl FT OF CABLE TO 1 F_ OF PIPE_
_nIN I 3 I6IgI_I _s Isn
SPIRALCABLE(2 F]_OFCABLETO1FT OFPIPE.)
3nIN I _ I4IRIRI1_7 I:_33
SPIRALCABLE(3 FI_OFCABLETO1FT OFPIPE.)
Table 2 assumes lowest outside temperature of 0°F with
a minimum of 1/2" fiberglass insulation or equivalent (i.e.
Armaflex.) For protection to --20°F, use 1" fiberglass
insulation or equivalent. Multiple heat cable may be
needed for longer runs of pipe.
1 - -The first 30" from plug end of the heat cable is the
cord set. This section does not get hot and should
not be wound around the pipe. To prevent damage
to the cord set, provide a strain relief using plastic
cable ties, or three thicknesses of either, vinyl, glass
cloth or heavy duct tape.
2--Wrap heat cable around pipe, condensate trap
assembly or vent termination, so that the cable is
pulled tight to ensure continuous contact between
the cable and the pipe. See figure 1.
Side View
If heat cable is longer than pipe, spiral
cable evenly along pipe and according toT able 2.
Side View End View
If pipe is 0.5" condensate pipe, cable of same length may be
run straight along pipe in either the 4 or 8 o'clock position.
FIGURE 1
3 - - After wrapping heat cable around pipe, secure cable
to the pipe using fiberglass tape. Wrap tape around
the pipe and cable using approximately 1-1/2 wraps
every foot. See figure 2. Do not use electrician's
tape, duct tape, vinyl tape, metal clamps or any
wire. Heat from the cable breaks down adhesive
properties of these tapes.
HEAT CABLE ALUMINUM FOIL TAPE
•,,'-',_1_ ' '/•......_I INSULATION
?,,J'
PVC or CPVC \
PIPE FIBERGLASS TAPE
(Wrap around pipe 1-1/2 times)
FIGURE 2
Page 1