Residential HRV/ERV
23
If low speed is insucient and high speed is required to satisfy 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.
Slave Mode - Enabling High Speed
D) Interlocking the HRV/ERV to an Air-Handler/Furnace Blower
Installations sharing ductwork with air-handling units or furnaces operate most effectively
when those units are powered on to properly distribute the fresh air provided by the ventilator
throughout the home. The HRV/ERV has the ability to interlock with external equipment, such
as an air-handler or furnace blower, to activate or deactivate that equipment as necessary.
The unit’s terminal strip has two fan interlock options via terminals 6, 7, and 8 on the terminal
block. Terminal 6 is NORMALLY CLOSED, and terminal 8 is NORMALLY OPEN. Terminal 7 is the
ground for both 6 and 8.
For the HRV/ERV to operate only in conjunction with the Air-Handler/Furnace, do the
following:
1. Connect the HRV/ERV as illustrated below. Refer to the AHU Owner’s Manual/Wiring
Diagram for instructions on connecting to the fan start relay.
Note: It is the same process as connecting the fan control on a thermostat.
2. Ensure the air-handler/furnace blower motor is operating whenever the HRV/ERV is
ventilating.
Note: Consideration must be given to competing airows when connecting the HRV/ERV in
conjunction with an Air-Handler/Furnace Blower system.
NO
NC
GRN
GRN
RED
WHT
8
7 6
2
1
345
TERMINAL BLOCK
BLK
COM
JUMPER
(SWITCH)
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