3. Relocate junction box and associated plugs and
grommets to opposite side panel. Secure with screws
removed in step
IRE ROUTING MUST NOT INTERFERE WITH CIRCULATOR BLOWER
FILTER REMOVAL OR ROUTINE MAINTENANCE
To ensure proper unit grounding, the ground wire should run
from the furnace ground screw located inside the furnace
junction box all the way back to the electrical panel. NOTE:
Do not use gas piping as an electrical ground. To confirm
proper unit grounding, turn off the electrical power and
perform the following check.
1. Measure resistance between the neutral (white)
connection and one of the burners.
Resistance should measure 10 ohms or less.
This furnace is equipped with a blower door interlock
switch which interrupts unit voltage when the blower door
is opened for servicing. Do not defeat this switch.
24 Volt Thermostat Wiring
Low voltage connections can be made through either the right
or left side panel. Thermostat wiring entrance holes are located
in the blower compartment. The following figure shows con-
nections for a "heat/cool system".
This furnace is equipped with a 40 VA transformer to facilitate
use with most cooling equipment. Consult the wiring diagram,
located on the blower compartment door, for further details
of 115 Volt and 24 Volt wiring.
HIGH VOLTAGE !
O AVOID PERSONAL INJURY OR DEATH DUE TO
DISCONNECT ELECTRICAL POWER
BEFORE SERVICING OR CHANGING ANY ELECTRICAL
Single-Stage Heating Thermostat Application
A single-stage thermostat with only one heating stage is
needed to control this furnace.
Fossil Fuel Applications
This furnace can be used in conjunction with a heat pump in
a fossil fuel application. A fossil fuel application refers to a
combined gas furnace and heat pump installation which uses
an outdoor temperature sensor to determine the most cost
efficient means of heating (heat pump or gas furnace).
Strictly follow the wiring guidelines in the fossil fuel kit in-
stallation instructions. All furnace connections must be made
to the furnace two-stage integrated control module and the
"FURNACE" terminal strip on the fossil fuel control board.
Furnaces may be twinned without the use of a twinning
kit. Furnaces must be the same model and equipped with
control boards. Follow the diagram provided in
this manual. Connection of the "twin" terminals of each
control together will allow simultaneous operation of two
or more furnace indoor blowers to operate synchronously
on a common duct system. Field installed low voltage
thermostat wiring, 3/16" terminals are required to make
this connection. An isolating relay (24 VAC coil & N/O
SPST) contacts is also required if the furnaces are not fed
from the same line voltage phase. A pulsing DC signal is
used to share the call for fan operation between furnac-
es. The duration of the pulse width determines the speed
that the reading control will energize its blower motor.
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING
NLY MINOR ADJUSTMENTS SHOULD BE MADE BY ADJUSTING
THE GAS VALVE PRESSURE REGULATOR
OSSIBLE PROPERTY DAMAGE
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
LL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY
Gas Supply and Piping
INLET GAS SUPPLY PRESSURE
Minimum: 4.5" w.c.
Minimum: 11.0" w.c.
The furnace rating plate includes the approved furnace gas input
rating and gas types. The furnace must be equipped to operate
on the type of gas applied. This includes any conversion kits
required for alternate fuels and/or high altitude.
Remote Condensing Unit
Inlet gas supply pressures must be maintained within the ranges
specified in the following table. The supply pressure must be
constant and available with all other household gas fired ap-
pliances operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
PERSONAL INJURY OR DEATH MAY
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.