035-19670-003 Rev. A (1004)
10
Unitary Products Group
IMPORTANT:
Set the heat anticipator in the room thermostat to 0.10
amps. Setting it lower will cause short cycles. Setting it higher will cause
the room temperature to exceed the set points.
Apply strain relief to thermostat wires passing through the cabinet.
IMPORTANT:
Some electronic thermostats do not have adjustable heat
anticipators. They may have other type cycle rate adjustments. Follow
the thermostat manufacturer's instructions.
The 24-volt, 40 VA transformer is sized for the furnace components
only, and should not be connected to power auxiliary devices such as
humidifiers, air cleaners, etc. The transformer may provide power for an
air conditioning unit contactor.
ACCESSORY CONNECTIONS
The furnace control will allow power-switching control of various acces-
sories. Refer to Figure 15, for connection details.
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4” (0.64 cm) spade terminals (EAC and NEUTRAL) for electronic
air cleaner connections are located on the control board. The terminals
provide 115 VAC (1.0 amp maximum) during circulating blower opera-
tion.
HUMIDIFIER CONNECTION
Two 1/4” (0.64 cm) spade terminals (EAC and NEUTRAL) for humidifier
connections are located on the control board. The terminals provide 115
VAC (1.0 amp maximum) during heating system operation.
TWINNING
These furnaces are not to be twinned. If more than one furnace is
needed in an application, each furnace must have its own completed
duct system and its own wall thermostat.
FIGURE 10:
Line Wiring Connections
FIGURE 11:
Field Wiring for Single Stage Thermostat
FIGURE 12:
Field Wiring for Two Stage Thermostat
BLK
WHT
GRN
BLK (HOT)
WHT (NEUTRAL)
GRN
NOMINAL
120 VOLT
Y1
W1
R
G
C
Y1
Y2
Y
W1
W
W2
R
G
C
SINGLE STAGE
THERMOSTAT
T’STAT
COMMON
CONNECTION
Y1
Y2
W1
W2
R
G
C
Y1
Y2
R
C
INTEGRATED
CONTROL
T’STAT
COMMON
CONNECTION
TWO-STAGE
THERMOSTAT
OUTDOOR
UNIT
Set the heat anticipator in the room thermostat as shown below. Set-
ting it lower will cause short cycles. Setting it higher will cause the
room temperature to exceed the setpoint.
Two-Stage Thermostat
First Stage
.4 Amps
Second Stage
.1 Amps
Single Stage Thermostat
.4 Amps
FIGURE 13:
Accessory Connections
BLK
115 VOLT
HUMIDIFIER
HUM. HOT
WHT
EAC HOT
115 VOLT
ELECTRONIC
AIR CLEANER
BLK
WHT
EAC
HUM
NEUTRALS
EAC
HUM
SWITCHED
CIRCUITS
