User Guide

12
3. CONNECTIONS (CONT’D)
3.2 ELECTRICAL CONNECTION TO OPTIONAL AUXILIARY WALL CONTROL
Never connect a 120-volt AC circuit to the terminals of the central forced-air system interlock (standard wiring). Only use
the low voltage class 2 circuit of the central forced-air system blower control. The unit is designed for low voltages only.
Connecting the unit on 120-volt circuit would damage it instantly.
WARNING
!
3.3 CONNECTION TO THE CENTRAL FORCED-AIR SYSTEM
3.2.1 ELECTRICAL CONNECTION TO 20-40-60 OPTIONAL AUXILIARY WALL CONTROL
Gnd
OVR
12V
LED
VC0243
Gnd
OVR
12V
LED
Air Exchanger PCB
Terminal Blocks
Y
W
C
G
R
Y W G R C Acc
Central Forced-Air System Thermostat
Central Forced-Air System
Wiring Options with Central Forced-Air System
Vent
Y
W
C
Gf
G
R
J13
COM
NC
NO
Internal
Logic
Optional Wiring for Synchronization
Optional Wiring for Activation from Thermostat
Basic Central Forced-Air System / Required Wiring
VE0451A
3.3.1 UNIT OPERATION USING A CENTRAL FORCED-AIR SYSTEM THERMOSTAT
If the thermostat is equipped with an optional ventilation output, it is possible to use it to operate the unit. Choose among these 4
confi gurations: minimum (unit operating in MIN speed), intermittent (unit operating in MIN speed 20 min/h then as per INT
confi guration selection for 40 min), auto (unit operating according to outdoor temperature) and maximum (unit operating in MAX
speed) in DRY option on the LCD screen when the VENT contact is activated. Refer to section 5 for more details.
NOTE : This dry contact option will override the main wall control so we do not recommend to use a wall control and the thermostat
together.
3.3.2 UNIT INTERCONNECTION WITH CENTRAL FORCED-AIR SYSTEM (R/C/G/GF)
These connections must be done if you want the unit to force the central forced-air system blower operation when ventilating.
NOTE : These connections are required for installation confi guration T-4. Refer to section 2.2 for more details.
3.3.3 SYNCHRONIZATION WITH CENTRAL FORCED-AIR SYSTEM FUNCTION
The Virtuo technology allows synchronizing the unit operation with the central forced-air system operating time. It prevents unnecessary
central forced-air system operating time while providing a better air distribution.
NOTE : W and Y connections must be added to R and C connections to inform the unit that the central forced-air system is running.
When confi gurating OVR option on the LCD screen, choose among these 3 confi gurations: BAL (the unit remains balanced while
providing maximum airfl ow), PER (the unit is slightly unbalanced since the distribution motor is in MAX speed while allowing maximum
exhaust ventilation) and DIS (the unit is unbalanced since air distribution is constant despite a higher need in exhaust ventilation).