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Interlocking the HRV to an Air handler/Furnace Blower
Connecting the HRV as illustrated will ensure the Air
Handler/Furnace Blower Motor is operating whenever the
HRV is ventilating.
The HRV 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
Operating the HRV without a Main Control and Adding Dry Contact Controls
CAUTION
Consideration should be given to competing
airflows when connecting the HRV 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 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 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)
A jumper must be in place between 2 (ON) and
3 (RED) on the Terminal Block to activate the
HRV 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)
The HRV must have a Jumper in place
between 2 (ON) and 3 (RED) on the
Terminal Block when installing the unit
without a Main Control.