GCSS96 Installation Manual
25
control module. The humidifier and electronic air cleaner hot
terminals are identified as HUM and EAC. The humidifier and
electronic air cleaner neutral terminals are identified as NEU-
TRAL. All field wiring must conform to applicable codes. Connec-
tions should be made as shown. (See Figure 29.)
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to
all local codes, and have a minimum temperature rating of 105°C.
All line voltage wire splices must be made inside the furnace
junction box.
The integrated control module single humidifier terminal (HUM)
is energized with 115 volts whenever the induced draft blower is
energized. This terminal can also be used to provide 115 volt
power to a humidifier transformer. The remaining primary
transformer wire would be connected to the Line N on the
control board. The integrated control module electronic air
cleaner terminals (EAC) are energized with 115 volts whenever
the circulator blower is energized.
NOTE: Wire routing must not to interfere with circulator blower
operation, filter removal, or routine maintenance.
JUNCTION BOX RELOCATION
LINE VOLTAGE CONNECTIONS CAN BE MADE THROUGH EITHER THE RIGHT
OR
LEFT SIDE PANEL. THE FURNACE IS SHIPPED CONFIGURED FOR A LEFT
SIDE
ELECTRICAL CONNECTION. TO MAKE ELECTRICAL CONNECTIONS
THROUGH
THE OPPOSITE SIDE OF THE FURNACE, THE JUNCTION BOX MUST
BE
RELOCATED TO THE LEFT SIDE PRIOR TO MAKING ELECTRICAL
CONNECTIONS
. TO RELOCATE THE JUNCTION BOX, PERFORM THE
FOLLOWING
STEPS.
1. Remove the burner compartment door.
2. Remove and save the two screws securing the junction
box to the side panel.
3. Relocate junction box and associated plugs and grommets
to opposite side panel. Secure with screws removed in
step
W
IRE
ROUTING
MUST
NOT
INTERFERE
WITH
CIRCULATOR
BLOWER
OPERATION
,
FILTER
REMOVAL
OR
ROUTINE
MAINTENANCE
.
IMPORTANT NOTE
To ensure proper unit grounding, the ground wire should run
from the furnace ground screw located inside the furnace junc-
tion 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 follow-
ing check.
1. Measure resistance between the neutral (white) connection
and one of the burners.
2. 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 connec-
tions 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 !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
WIRING
.
WARNING
SINGLE-STAGE HEATING THERMOSTAT APPLICATION
A single-stage thermostat with only one heating stage is
needed to control this furnace.
Figure 30
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 com-
bined gas furnace and heat pump installation which uses an out-
door 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 installa-
tion 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.