Connection To The Central Forced-Air System; U Nit O Peration U Sing A D Ry C Ontact C Onnection; U Nit I Nterconnection With C Entral F Orced -A Ir S Ystem (R/C/G/G F ); Ynchronization With Entral Orced Ir Ystem Unction - Broan B180H75rT User's And Installer's Manual

3.3 c
onnection to the
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.
3.3.1 u o u
niT peraTion Sing a
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 configurations:
minimum (unit operating in MIN speed),
intermittent (unit operating in MIN speed
20 min/hr then as per INT configuration
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 -13°F = 10 min/hr
• -13°F to 19°F = 20 min/hr
• 19°F to 50°F = 40 min/hr
• 50°F to 77°F = MIN speed
• 77°F to 82°F = 30 min/hr
• 82°F to 91°F = 20 min/hr
• Above 91°F = 10 min/hr
3.3.2 u i
niT nTerconnecTion wiTH
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 configuration T-4. Refer to section 2.2 for more details.
3.3.3 S
yncHronizaTion wiTH
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).
c F -A s
entrAl orceD ir ystem
d c c
ry onTacT onnecTion
Wiring for Dry Contact Connection
Air Exchanger
Terminal Blocks
J13
Vent
OVR
LED
12V
GND
1- External switch or any Dry-contact can be used to
1 - External switch or any dry contact can be used to activate vent input if not
activate Vent input if not available on the Thermostat
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.
NOTE : This dry contact option will override the main wall control so we do not recommend
VE0454A
the use of a wall control with this type of connection.
NOTE : Following ducting installation configuration and temperature conditions, it may be
necessary for the unit to operate continuously. Refer to section 2.2 for more details.
c f -a
enTral orced ir
Wiring Options with Central Forced-Air System
Air Exchanger PCB
Terminal Blocks
Internal
Logic
VE0455A
c f -a S
enTral orced ir ySTem
!
WARNING
Central Forced-Air System Thermostat
1
Y W G R C Acc+ Acc-
Y
W
C
Gf
G
R
Central Forced-Air System
J9
D-
D+
S (r/c/g/g )
ySTem f
Central Forced-Air System Thermostat
Y W G R C
J13
Vent
Y
W
C
Gf
G
R
Optional Wiring for Synchronization
f
uncTion
14
Alternate Wiring for Dry Contact Independent Installation
Air Exchanger
Terminal Blocks
J13
Vent
Y
Y
W
W
C
C
Gf
G
G R
R
J9
OVR
LED
12V
D-
D+
GND
Note : Synchronization with a central forced-air system
with W and Y is not available with this configuration.
Y
W
C
G
R
External Switch or any
alternate Dry-Contact