Lennox G21, GSR21, G26, GHR26 Installation Instructions Manual

GAS UNITS
KITS AND ACCESSORIES

_j_ Technical

_L Publications

Utho U.S.A,

@1997 Lennox Industries Inc, 503,289M

Dallas, Texas 2/97

Supersedes 7/96

HEAT CABLE KIT

INSTALLATION INSTRUCTIONS FOR HEAT CABLE KIT (LB--88643A, B & C) USED

WITH G21, GSR21, G26, GHR26 AND COMPLETEHEAT SERIES UNITS

Table 2 assumes lowest outside temperature of 0°F with

Package 1 of 1 contains:
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

6 F]_ 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 I 6 I g I _ I _s I sn

SPIRALCABLE(2 F]_OFCABLETO1FT OFPIPE.)

3nIN I _ I 4 I R I R I 1_7 I :_33

SPIRALCABLE(3 FI_OFCABLETO1FT OFPIPE.)

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

4--Applyaluminumfoiltapeinlinearstripsoverpipeand

cable.Do not spiral wrap foil tape over pipe. tt may

be necessary to fold one strip up from the bottom and
one strip down from the top of the pipe to ensure

complete coverage. See figure 2.

5--Insulate pipe using fiberglass insulation or

equivalent, i.e. Armaflex. For protection to 0°F use
minimum of 1/2" fiberglass insulation or equivalent

(i.e. Armaflex.) For protection to --20°F, use 1"

fiberglass insulation or equivalent. For protection to

- -40° F,use 1-1/2" fiberglass insulation or equivalent.
See figure 2.

6--Use waterproofing materials such as polyethylene

sheets or other vapor barriers to protect insulation in
areas exposed to moisture (vent termination).

7 - - Refer to figure 3 for G21 condensate trap assembl

G21 CONDENSATE TRAP ASSEMBLY

HEAT CABLE

TRAP

FIBERGLASS

TAPE

*Heat cable can be run

straight on 0.5" condensate

line. See table 2.

DO NOT BLOCK

CLEAN-OUT PLUG

FIGURE 3

8 - -Two methods may be used to apply the heat cable to

concentric vent terminations. See figures 4 and 5.
Figure 4 shows wrapping the heat cable around a

concentric vent termination that has already been
installed. The 24ff. heat cable is recommended for

this method.

CONCENTRIC WALL

TERMINATION APPLICATIONS

EXHAUST CLAMP

\ FIBERGLASS

TAPE "_l_

START OF
CORDSET

EXHAUST

FLUE/

CAP

cable is sufficient for this method. If allowable, this
method is recommended over the first method

because it provides better flue pipe protection.
NOTE-- The waft or roof hole may need to be

enlarged to provide enough clearance for the heat
cable and insulation. The heat cable can be installed

over the mounting clamp or the clamp can be opened

up to provide enough clearance for the heat cable

and insulation.

I

HEAT CABLE for cable. Seal hole after running

__ heat cable Jr.

IMPORTANT J

Drill 1/2" dia. hole in rain shield

1-1/2"

EXHAUST

through

Dr,,,/2"dia.he,oi°iow,°OO°te,Sg°

from air intake connection. Seal hole l /

after running heat cable through it. RAIN

i .o

_/_F-_ AIR INTAKE

FIGURE 5

10- -For the HM30 module of the CompleteHeat system,

spiral wrap the flue trap twice with heat cable before
wrapping the condensate line. See figure 6. Enlarge

condensate line cabinet hole to allow for heat cable
and insulation. Make sure there is enough clearance

between heat cable and cabinet. Protective coating
on heat cable must not be damaged. Do not wrap

the flue trap boot.

HM30 FLUE TRAP

CONDENSATE

LINE*

/

FIBERGLASS

FLUE TRAP

INTAKE

FIGURE 4

9--Figure 5 shows wrapping a concentric vent

termination before it has been installed. The 6 ft.

Page 2

FLUE TRAP BOOT ," ,

i

_IL ..................J *Heat cable can be run

FIGURE 6

FIBERGLASS

TAPE

!

straight on 0.5" condensate

line. See table 2.