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Interlocking the HRV/ERV to an Air Handler/Furnace Blower
Connecting the HRV/ERV as illustrated will ensure the Air
Handler/Furnace Blower Motor is operating whenever the
HRV/ERV is ventilating.
The HRV/ERV must be interlocked to the Furnace/Air
Handler with a Simplified Installation (Return/Return
Installation) and should be interlocked with a Partially
Dedicated Installation.
Wire
Connector
FurnaceTerminal Strip
Furnace
Thermostat
H
RVTerminal Block
Operating the HRV/ERV without a Main Control and Adding Dry Contact Controls
CAUTION
Consideration should be given to competing
airflows when connecting the HRV/ERV in
conjunction with an Air Handler/Furnace Blower
system.
Setting “Standby” when using a Main Control
CAUTION
Building codes in some areas require “fully-
off” functionality. Check with your local
building authority before modifying the unit
to “standby -off”.
Unintentional operation of the HRV by the
end user may occur if the unit is modified
from “fully-off” to “standby-off”.
The HRV/ERV will be “fully-off” when the
OFF position is selected on the Main Control.
Timers and /or other controls will not function
when the HRV/ERV is in the OFF position.
The “fully-off” feature can be modified to
“standby-off” by adding a jumper on the
Terminal Block between 2 (ON) and 3 (RED).
“Standby” can also be achieved by setting the
main control to the ON position and selecting
speed 0*. Timers and /or additional controls
will initiate high speed ventilation when
activated
.
* Speed 0 is not available on all controls
The Terminal Block
(located on the HRV/ERV)
A jumper must be in place between 2 (ON) and
3 (RED) on the Terminal Block to activate the
HRV/ERV for timers and/or dry contact
controls.
Adding Dry Contact Controls
Low Speed - A jumper between 2 (ON) and
1 (LOW) initiates low speed ventilation.
High Speed - A jumper between 2 (ON) and
6 (HI) initiates high speed ventilation.
Dehumidistat - A dry contact for a dehumidistat
is connected between 2 (ON) and 10 (BLK).
The Terminal Block
(located on the HRV/ERV)
The HRV/ERV must have a Jumper in
place between 2 (ON) and 3 (RED) on
the Terminal Block when installing the
unit without a Main Control.