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8.0
Installation of the Controls
8.3 E
LECTRICAL
MAIN PC BOARD
OL
OC
J3
J1
1
2
3
VE0036A
8.4 E
LECTRICAL
Never connect a 120-volt AC circuit to the terminals of the furnace interlock (standard wiring). Only
use the low voltage class 2 circuit of the furnace blower control.
For a furnace connected to cooling system:
On some older thermostats, energizing the "R" and "G" terminals at the furnace has the effect of energizing
"Y" at the thermostat and thereby turning on the cooling system. If you identify this type of thermostat, you
must use the "alternate furnace interlock wiring". An additional control relay will then have to be installed.
Standard furnace interlock wiring
W
R
G
Y
FOUR
WIRES
TWO WIRES
heating only
W
R
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
VE0010A
C
ONNECTION TO
9
8
7
6
5
4
3
I
2
1
4
7
5
8
6
9
C
ONNECTION TO THE
WARNING
!
010
THERMOSTAT
TERMINALS
HRV CONTROL CONNECTOR
J3
F F
I OC OL Y R G B
TWO WIRES
COOLING SYSTEM
(con'd)
O
C
PTIONAL
ONTROLS
PUSH-BUTTON SWITCHES
(5 switches maximum)
F
URNACE
Alternate furnace interlock wiring
W
R
G
4 WIRES
2 WIRES
heating only
W
R
R
G
C
Y
Y
FURNACE
24-VOLT
TERMINAL BLOCK
*FURNACE INTERLOCK RELAY, PART # 12658
VE0009A
24
0L
I
REAR VIEW
Unit Control Module
9-PIN AMP PLUG
THERMOSTAT
Y
J1
TERMINAL
1
4
2
5
3
6
wiring
nuts
GRAY
RED
GREEN
NC
NO
COM
BLUE
*FURNACE INTERLOCK
RELAY
2 WIRES
COOLING SYSTEM
7
7
8
9
BROWN
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Troubleshooting
