LENNOX Furnace/Heater, Gas Manual L0806891

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_ Technical
GAS UNITS j i_blc=10.s
KITS AND ACCESSORIES LithoU,S.A,
©1997 Lennox industries inc.
Datlas, Texas
503,772M
10/97 FURNACE TRANSITION KIT
INSTALLATION INSTRUCTIONS FOR FURNACE TRANSITION KIT CAT# 16L42
(LB-93419A), AND CAT# 16L43 (LB-93420A) USED WHEN CONVERTING FROM GSR14
UNITS TO GHR26 UNITS (DOWNFLOW)
Package 1 of 1 contains:
1 - Supply airtransition
1 - Return air transition
8- Insulation pins
8- Insulation washers
1-Roll of adhesive-backed foam tape (1/8" thick x
5/16" wide)
Check all components for shipping damage. Consult
last carrier immediately if damage is found.
Table 1 shows furnace transition kit usage. These kits
are used when replacing an existing GSR14
downflow furnace with a GHR26 downflow furnace, It
allows installation of the GHR26 furnace without
modification of the existing supply and return air
plenums.
Note -GHR26 units are not certified for installation in
mobile homes.
Refer to figure 1 for typical GSR14 installation.
1 - Set the thermostat to the lowest setting.
2 - Disconnect electrical power to GSR14 unit.
3- Shut off gas to GSR14 unit.
4- In applications without air conditioning
disconnect supply air plenum. In applications
with air conditioning disconnect coil cabinet,
5 - Disconnect return air plenum.
6 - Remove control access panel,
7 - Cut combustion air intake pipe and exhaust pipe
in location(s) which will allow convenient
reconnection of pipes to GHR26 unit, and/or
removal of muffler(s) (if installed), Remove
muffler(s) (if installed). Support intake and
exhaust pipes to prevent damage to pipe joints.
8- Cut heat exchanger condensate drain line in a
location which will allow convenient
reconnection with GHR26 unit.
9 - Disconnect gas line at unit.
10 -Disconnect power wiring at unit.
11 -Disconnect low voltage wiring at unit.
12 -Remove blower access panel.
13 -Remove filter from inside of unit (if present) and
disconnect return air plenum at unit.
Note -Existing GSR14Q4/5-80/lO0 filter can be
used in GHR26Q4/5-100 units.
14 -Remove GSR14 unit.
TABLE 1
GSR14 CABINET WIDTH GHR26 CABINET WIDTH KIT CAT# (LB#)
inches (mm) inches (mm)
Q3-50 21-1/4 (540) Q2/3-50 16-1/4 (413) 16L43 (LB-93420A)
Q3-80 2t-1/4 (540) Q3-75 t6-1/4 (413) 16L43 (LB-93420A)
Q4/5-80 21-1/4 (540) Q4/5-100 21-1/4 (540) 16L42 (LB-93419A)
Q4/5-t00 21-1/4 (540) Q4/5-100 21-1/4 (540) 16L42 (LB-93419A)
Note -There is no direct replacement for GSR14Q4-50 unit with a GHR26 unit.
Page 1
TYPICAL GSR14 DOWNFLOW INSTALLATION
CLOSET
GAS SUPPLY PIPING
INTAKE PIPE
MANUAL SHUT-OFF VALVE _ _
DRIP LEG
GAS CONNECTOR
AIR PLENUM
EXHAUST PIPE
BLOWER ACCESS PANEL
CONDENSATE TRAP
DRIP LEG
CONTROL ACCESS PANEL
ISOLATION PADS (ISOMODE) (4',
COOLING COIL CABINET
CONDENSATE DRAIN
FLOOR
FIGURE 1
Page 2
Note - Installation must conform with these
instructions and the installation instructions
packaged with the GHR26 furnace.
A-Return Air Transition installation.
Refer to figure 2.
1- Lay GHR26 unit on its back (exposed internal
parts facing up).
2 - Cut four strips from rollofadhesive-backed foam
tape (provided) and fit to return air transition
flanges. Apply to flanges.
3- If required, internally insulate transition with
foil-faced insulation (field provided) and fasten
with kit provided insulation pins and washers.
4 - Install transition as shown.
5-Install filter as shown in GHR26 installation
instructions. GHR26Q4!5-100 unit will accept
installation of GSR14Q4/5-80/100 unit filter,
GHR26-50 and -75 units require a field provided
14x25x1 filter,
B-Supply Air Transition Installation.
Refer to figure 2.
1 - Cut four strips from rollofadhesive-backed foam
tape (provided) and fit to supply air transition
flanges. Apply to flanges.
2- If required, internally insulate transition with
foil-faced insulation (field provided) and fasten
with kit provided insulation pins and washers.
3 - Install transition as shown.
C-Unit Installation
1 - Align unit with existing supply air plenum (coil
cabinet in air conditioning applications) and
return air plenum. Make connections to unit.
2- Connect low voltage wiring as illustrated in
GHR26 installation instructions,
3-Connect high voltage wiring as outlined in
GHR26 installation instructions.
4-Connect gas piping as outlined in GHR26
installation instructions.
Consult local codes for flexible connector
installation restrictions on GHR26 furnace.
5- Connect venting as outlined in GHR26
installation instructions,
Note -Mufflers can not be used in GHR26
installation. Check existing venting for size
(diameter and length). It should meet the
specifications as outlined in GHR26 installation
instructions. If a concentric vent is used for
GHR26-100 unit, it must be identified as catalog
number 33Kg7.
6 - Connect heat exchanger condensate drain line as
outlined in GHR26 unit installation instructions.
Note -Coil drain line must not be connected to
heat exchanger condensate drain line. If lines
were connected, debris from evaporator could
affect heat exchanger operation.
7 - Continue with Unit Start-up Section as outlined
in GHR26 installation instructions.
Note -See GHR26 installation instructions for heat
anticipation settings,
Page 3
SECURINGSCREWS._,
RETURNAIRTRANSITION
TYPICAL GHR26 DOWNFLOW INSTALLATION
RETURN PLENUM INSTALLATION -
(Identify transition by its two sided taper.)
1 - Install foam tape as shown.
2 - Position plenum as shown in main figure
and front and side views,
3 - Secure two sides and back by bending
unit flanges as shown in detail A and!or by instal-
ling screws on these three sides.
ADHESIVE-
BACKED
FOAM TAPE
UNIT
SUPPLY AIR TRANSITION
ADHESIVE-
BACKED
FOAM TAPE
SECURING SCREWS ------...._
SUPPLY PLENUM INSTALLATION -
(Identify transition by its three-sided taper.)
f _ TRANSITION FLANGE
_i'\/ UNIT FLANGE
i!F_!t_!!!ii!fi
ADHESIVE-
BACKED 4_
FOAM TAPE
. i
DETAIL A
SECURING OF TRANSITIONS
ee instructions in this figure for each transition)
,J
Z
\
FRONTVIEW RIGHT SIDE VIEW
1 - Install foam tape as shown.
2 - Position plenum as shown in main figure and front and side views.
3 - Secure with field provided screws as shown (two each side).
(Bend unit flanges over for additional air sealing, if desired, See detail A.)
FIGURE 2
Page 4

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