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13
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.
To use this function, W and Y connections must be added to R and C connections to inform the unit that the central
forced-air system is running (refer to dotted lines in above diagram).
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
Air Exchanger PCB
Terminal Blocks
Y
W
C
G
R
Y W G R C
Central Forced-Air System Thermostat
Wiring Options with Central Forced-Air System
Vent
Y
W
C
Gf
G
R
J13
Internal
Logic
Optional Wiring for Synchronization
3.3.1 uniT operATion usinG A drY conTAcT connecTion
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 (refer to solid lines in above diagram).
NOTE: These connections are required for installation conguration T-4. Refer to section 2.2 for more details.
3.3.3 sYncHronizATion wiTH cenTrAl forced-Air sYsTem funcTion
Y
W
C
G
R
Y W G R C Acc+ Acc-
Central Forced-Air System Thermostat
Central Forced-Air System
Wiring for Dry Contact Connection
1
1- External switch or any Dry-contact can be used to
activate Vent input if not available on the Thermostat
Air Exchanger
Terminal Blocks
Alternate Wiring for Dry Contact Independent Installation
Vent
Y
W
C
Gf
G
R
J13
OVR
LED
12V
D-
D+
GND
J9
External Switch or any
alternate Dry-Contact
Air Exchanger
Terminal Blocks
Vent
Y
W
C
Gf
G
R
J13
OVR
LED
12V
D-
D+
GND
J9
Note : Synchronization with a central forced-air system
with W and Y is not available with this configuration.
1 - External switch or any dry contact can be used to activate vent input if not
available on the thermostat. Some thermostats offer a single wire 24VAC output
for accessory ventilation. It can be directly connected to vent input and therefore
the Acc- / R connection is not required.
This unit can be controlled by any dry contact connection such as the thermostat equipped with an optional ventilation output.
Once wired, unit will toggle between
the Standby mode when contact is
opened and the selected mode when
contact is closed. Choose among these 4
congurations: minimum (unit operating
in MIN speed), intermittent (unit
operating in MIN speed 20 min/hr then
as per INT conguration 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.
* In auto mode, the unit will operate as
follows:
• Less than -25°C = 10 min/hr
• -25°C to -7°C = 20 min/hr
• -7°C to 10°C = 40 min/hr
• 10°C to 25°C = MIN speed
• 25°C to 28°C = 30 min/hr
• 28°C to 33°C = 20 min/hr
• Above 33°C = 10 min/hr
NOTE : This dry contact option will override the main wall control so we do not
recommend the use of a wall control with this type of connection.
NOTE : Following ducting installation conguration and temperature conditions, it
may be necessary for the unit to operate continuously. Refer to section 2.2
for more details.
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