035-17468-001 Rev. A (801)
Unitary Products Group
13
NOTE:
The power connection leads and wiring box on upflow
units may be relocated to the left side of the furnace. Remove
the screws and cut wire tie holding excess wiring. Reposition
on the left side of the furnace and fasten using holes pro-
vided.
ELECTRICAL CONTROL CONNECTIONS
Install the field-supplied thermostat. The thermostat instruc-
tions for wiring are packed with the thermostat. With the ther-
mostat set in the OFF position and the main electrical source
disconnected, complete the low-voltage wiring from the ther-
mostat to the terminal strip on the cfm timer board. Connect
Class 2 control wiring for single stage thermostat (refer to
(Refer to Figure 13 on Page 13)) or for two stage thermostat
(refer to (Refer to Figure 14 on Page 13).
NOTE:
Some electronic thermostats do not have adjustable
heat anticipators. They may have other type cycle rate adjust-
ments. Follow the thermostat manufacturer's
instructions.
The 24-volt, 40 VA transformer is sized for the furnace compo-
nents 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.
NOTE:
Apply strain relief to thermostat lines passing through
cabinet.
ACCESSORY CONNECTIONS
The furnace control will allow power switching control of vari-
ous accessories. Refer to Figure 15 for connection details.
ELECTRONIC AIR CLEANER CONNECTION
The junction box contains a clearly marked wire for connec-
tion to an electronic air cleaner. This wire provides 120 VAC
(1.0 amp maximum) during circulating blower operation.
HUMIDIFIER CONNECTION
The junction box contains a clearly marked wire for connec-
tion to a humidifier. This wire provides 120 VAC (1.0 amp
maximum) during heat speed operation of the circulating
blower
Set the heat anticipator in the room thermostat as shown below.
Setting 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 :
Field Wiring for Single Stage Thermostat
NOMINAL
120 VOLT
BLK
WHT
GRN
BLK (HOT)
WHT (NEUTRAL)
GRD
TYPICAL FIELD WIRING - SINGLE STAGE
SINGLE STAGE
THERMOSTAT
HUM
Y2
Y1
Y
R
W1
W2
G
C
O
X/L
Y1
R
W1
G
C
LOW HEAT TIME
ADJUSTMENT
CFM/TIMER BOARD
MINUTE SELECT
10
15
20
TIME OFF
HUM
Y2
Y1
Y
R
W1
W2
O
C
O
X/L
HUM
HEAT PUMP
HUMDISTAT
COOL
HEAT
DELAY
ADJ
P9
P6
W1
W2
10
15
20
MINUTE SELECT
FIGURE 14 :
Field Wiring for Two Stage Thermostat
Do not exceed 1.0 amp loading.
FIGURE 15 :
Accessory Connections
TYPICAL FIELD WIRING - TWO STAGE
TWO STAGE
THERMOSTAT
Y1
Y2 OUT
R
C
X/L
JUMPER MUST BE IN
TIMER OFF POSITION
CFM/TIMER
BOARD
Y2
Y1
Y
R
W1
W2
G
C
O
X/L
HUM
OUTDOOR
UNIT
Y2
Y1
R
W1
W2
Y2
G
C
X/L
115 VOLT
HUMIDIFIER
115 VOLT
ELECTRONIC
AIR CLEANER
BLK
WHT
EAC HOT
HUM. HOT
BLK
WHT
EAC
HUM
EAC
HUM
NEUTRALS
SWITCHED
CIRCUITS