LENNOX Furnace/Heater, Gas Manual L0806829

User Manual: LENNOX LENNOX Furnace/Heater, Gas Manual LENNOX Furnace/Heater, Gas Owner's Manual, LENNOX Furnace/Heater, Gas installation guides

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Technlc_J

GAS KITS AND ACCESSORIES

LJtho U.S., _

©1993 Lennox Industries Inc.
Dallas, Texas

502,887M
7/93
Supersedes

INSTALLATION
INSTRUCTIONS
LB--63093B
(64H88)

GAS TWINNING

KIT

502,583M

FOR TWINNING
KIT, NON--CONTINUOUS
USED WITH GAS FIRED FURNACES
A--Installing
Auxiliary

Package 1 of I contains:

FAN,

Auxiliary Limit Controls ($92)

limit controls

(identified as $92 on wiring

4-- #8 -- 18 screws

diagram key charts) must be installed to provide
protection from overheating in case of blower failure.
Install auxiliary limits as described in the following
sections according to the application.

5-- Grommets

For Upflow Units: (Figure 1)

1- - Twinning control box with cover
2- - Auxiliary limit controls on mounting bracket

4- - 1/4" piggy back terminal connectors

1- - Loosen blower housing screw.

5- - Dual male terminal connectors

2-- Slide bracket with auxiliary limit between blower
housing and blower deck.
3-- Tighten screw to secure auxiliary limit in place.

Twinning kit and gas fired furnaces must be installed and
wired in accordance with local codes. Authorities having
jurisdiction should be consulted before installation. Refer
to NEC standard in the US or CEC standard in Canada
on all wire insulations and sizes.

4-- Wire limits in series with Class II 24V voltage circuit
according to wiring diagrams in figures 7 and 9.
NOTE--Wires used to connect auxiliary limit control
should have insulated terminals.
AUXILIARY LIMIT LOCATION
FOR UPFLOW FURNACES
B LOWE R_F"_'_t2,.

Twinning kit (LB--63093B) is used for either single or
two--stage burner operation with simultaneous blower
operation. The two units must be of the same application:
upflow, downflow or horizontal. Furnaces must also be of
the same blower size. The heating speed taps on each
unit must be set the same. The cooling speed tap of one
unit must also be that same as the other unit. The control
system is designed for single or two- -stage heating and
single or two- -stage cooling.
NOTE--Air stratification problems may result from using
two stage heating with twinning kit.
This gas twin kit does not include the feature for
continuous low speed fan. A separate gas twinning kit
with that feature is available as part no. 35J93.

Installation of the gas twinning kit is in three parts. The
auxiliary limits are installed in each furnace. Next, the gas
twin control box is installed. Finally, the wiring is done to
complete the project.
Page1

BLOWER
HOUSING

_

_AUXlLIARY
LIMIT
(on bracket)

FIGURE 1
For Downflow and Horizontal Units: (Figure 2)
1- - Using limit bracket as a guide, place bracket on the
side of the blower housing and drill mounting hole.
Hole should be 1"to 1- -1/2" from the edge of blower
housing. Position limit so that limit face is mounted
toward return air opening.
2- - Secure limit bracket with sheet screw to the side of
the blower housing.
3--Wire
limits in series with low voltage circuit
according to wiring diagrams in figures 5, 7 and 9.
NOTE--Wires used to connect auxiliary limit control
should have insulated terminals.

1-- Disconnect and remove each unit transformer. Kit
transformer is the only transformer needed.
2-- All power to twinning kit control box is supplied
through furnace #2 door switch to terminal 8 in the
twin kit control box.

AUXILIARY LIMIT LOCATION FOR
DOWNFLOW AND HORIZONTAL FURNACES
BLOWER
HOUSING

AUXILIARY
LIMIT
(on bracket)
_

SCREW

I

BLOWER
DECK

BLOWER I

FIGURE 2
B--Installing
Gas Twin Kit Control
Box
Twinning kit control box should be installed, with screws
provided, on furnace side panel or any convenient
location, See figure 3,
TWIN KIT CONTROL BOX LOCATION

II

MOUNT BOX
CONTROL
IN A CONVENIENT
LOCATION

I I
2 AMP
REPLACEABLE
FUSE

3- - All line voltage connections must be made at the line
voltage terminal strip or the line power blocks. Wire
power and neutral lines to each furnace. Each
furnace requires a separate power supply.
4-- All Class II 24V voltage connections must be made
at the Class II 24V voltage terminal strip.
5-- The auxiliary limit controls must be connected in
series in the Class II 24V voltage circuit.
6-- System must be properly grounded and blowers
must have the same speed taps for cooling and the
same speed taps for heating. Tape all unused wires.
7- - Unitfan controlsand indoor blower relay coils must be
wired in parallel in the Class II 24V voltage circuit.
8- - For cooling applications, the "Y" or "Y1" or "Y2" wire
must run to the compressor contactor and back to
the ground side of the low voltage circuit in the kit
control box.
9- - Use 14 gauge wire to wire kit to unit.
10- - Use replacement piggy back terminals (provided) if
existing terminal are damaged when removing
transformers and wiring units together.
11 - -Insert provided plastic grommets in knockouts used
for wiring.
12--Affix provided wiring diagrams for each unit (unit1,
unit 2) on outside of furnace cabinet in a visible and
convenient location. Do not cover up existing unit
schematic diagrams.

COVER
(INSTALLED)

FIGURE 3
C--Furnace

Installation

Guidelines

Setting Units and Installing Ducts
Refer to unit installation instructions for setting of
individual furnaces and follow the procedures outlined. If
a common return duct is used, air entry should be
uniform to ensure eq ual air flow through the two furnaces.
Duct must be designed to prevent air stratification,
especially in two- -stage operation.
Venting
Refer to furnace installation instructions and AGNGAMA
venting booklet supplied with unit for guidelines.
G21/GSR21 and G26 units require separate intake and
exhaust pipes.
Gas Piping
Refer to furnace installation instructions for guidelines.
Make sure gas piping is properly sized to supply two
furnaces. Install piping so that there are no undue loads
on the furnace gas piping. Entire system must be
checked for leaks as directed in unit instructions.

Figure 4 shows internal wiring of twinning kit control box.
Typical wiring diagrams in figures 5 through 10 show the
two furnaces in standard speed.

For single stage heat operation, add heat anticipator
setting of each furnace together. If the value is higher that
the heat anticipation setting of the thermostat used, an
isolation relay must be used.
For two- -stage heat operation, refer to original unit wiring
diagram for heat anticipator setting for each thermostat.

Refer to individual furnace installation instructions

for

start--up and adjustment procedures.
Fan control
settings must be the same for both furnaces.

Both blower door interlock switches must be engaged to
supply power to the blowers and furnace control
systems. When there is a call for heat, heat relay within
the twinning kit control system is energized supplying
power to the furnace ignition control systems. Both
indoor blowers will come on when the fan- -on setting of
either furnace is reached.
When heat demand is satisfied, the heat relay is
de--energized,
cutting power to the furnace ignition
control systems and closing the gas valves. Both indoor
blowers will continue to run until the fan- -off settings are

Page 2

reached on both fan controls. If one of the blowers should
fail during a call for heat, a limit will break power to the
heat relays, thus closing the gas valves. The one working
blower will continue to run until the fan--off settings of
both fan controls of the two furnaces are reached. The
auxiliary limit resets automatically when sufficiently
cooled, so the furnaces will continue to cycle with the
auxiliary limit controls.An exception is on GSR21 units are

equippedwith manual

reset auxiliary limits (S21).

When the thermostat is in the fan- -on or cooling mode,
the parallel indoor blower relay coils are energized,
switching the blowers to high speed or the selected
cooling speed tap.
The control transformer is protected by a 2 amp fuse in
the twinning kit control box.

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Page 3

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DESCRIPTION
COMPONENT
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JACK BLOWER MOTOR
qELAY ACCESSORY
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5WITCH DOOR INTERLOCK
5WITCH L[N[_(SECONDARYJ
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