Multi-Unit Residential HRV/ERV
21
With this wiring, the unit can be operated at the following settings:
- Off
- Low Speed Exchange
- High Speed Exchange
- Low Speed Recirculation (except for models H/E110-TF)
- High Speed Recirculation (except for models H/E110-TF)
Low and High speeds can be adjusted with FlexControl (refer to page 32).
B) Unit wiring for Slave Mode
In slave mode, an external device or switch will dictate when the unit will operate. This is the
case for VentZone® Systems, use of third party thermostats with built in HRV/ERV controls,
and use of external third party switches that are used to enable/disable the unit. Installations
requiring a switch to enable or disable the unit via a wall switch will need to be placed into
slave mode.
To enable low speed exchange, a connection must be made between terminals 1 and 3 (see
illustration below). If this connection is open, the HRV/ERV will be put into standby mode.
This connection can be made using any 24V switch or dry contact controller, such as a smart
thermostat with integrated ventilator control or a programmable timer.
Slave Mode - Enabling Low Speed
If low speed is insufficient and high speed is required to satisfy the ventilation rate, connect
a jumper between terminals 3 and 4 in addition to the switched line between terminals 1
and 4 (see illustration below). This sets the ventilation speed to high.
NO
NC
GRN
GRN
RED
WHT
8 7 6
2
1
3
4
5
(SWITCH)
TERMINAL BLOCK
BLK
CO
M