21
6.0 Installation of the Main Control
(cont’d)
6.1 Installation
(cont’d)
4-
Connect the wires to the main control.
(See Figure 17.)
5-
Reinstall cover plate and buttons.
6-
Connect the wires to their corresponding positions inside the unit. Make sure
the connection at the unit and at the wall control correspond exactly.
(See Figure 18.)
7-
Plug in the unit and do the “overall verification” of the system.
NOTE: During the verification of a main control, make sure that all optional remote controls are inactive.
Figure 17
Y
R
GB
VD0026
F F I OC OL Y R G B
VE0011
Figure 18
WARNING
Never connect a 120 volts AC circuit to the terminals of the Furnace Interlock. Use only the low voltage class 2
circuit of the furnace blower control.
!
6.2 Electrical Connection to the Furnace
For a furnace connected to cooling system:
On some older thermostat, energizing the ‘’R’’ and ‘’G’’ terminals at the furnace has the effect of energizing ‘’Y’’ terminal 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’’.
The ‘’Standard Furnace Interlock’’ cannot be used and an additional control relay will have to be installed.
W R G
Y
W
R
G
C
Y
9
8
7
6
5
4
3
2
1
HRV CONTROL CONNECTOR
THERMOSTAT
TERMINALS
FOUR
WIRES
I OC OL Y R G B
F F
J
3
TWO WIRES
heating only
FURNACE
24-VOLT
TERMINAL BLOCK
TWO WIRES
COOLING SYSTEM
VE0010A
W
R
G
Y
W
R
Y
R
G
Y
C
J1
1
2
4
5
6
8
9
3
*FURNACE INTERLOCK
RELAY
NC
NO
7
COM
7
THERMOSTAT
TERMINAL
Unit Control Module
4 WIRES
2 WIRES
heating only
wiring
nuts
FURNACE
24-VOLT
TERMINAL BLOCK
2 WIRES
COOLING SYSTEM
GRAY
BROWN
RED
GREEN
BLUE
9-PIN AMP PLUG
*FURNACE INTERLOCK RELAY, PART # 12658
VE0009A
Standard Furnace Interlock Wiring
Alternate Furnace Interlock Wiring
