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Interlocking the HRV/ERV to an Air Handler/Furnace Blower
Connectingthe HRV/ERV as illustratedwill ensure the Air
Handler/FurnaceBlower Motor isoperating whenever the
HRV/ERV is ventilating.
TheHRV /ERV must be interlockedto the Furnace/Air
Handlerwith aSimplified Installation (Return/Return
Installation)and should be interlocked with a Partially
DedicatedInstallation.
Wire
Connector
FurnaceTerminalStrip
Furnace
Thermostat
HRVTerminalBlock
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
TerminalBlock 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 i nitiate h igh speed v entilat ion when
activated.
*Speed 0 is not available on all controls TheTerminal Block
(locatedon 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) initiateshigh speed ventilation.
Dehumidistat - A dry contact for a dehumidistat
isconnected between 2 (ON) and 10 (BLK). TheTerminal Block
(locatedon the HRV/ERV)
TheHRV/ERV musthave a Jumper in
placebetween 2 (ON) and 3 (RED) on
theTerminal Block when installingthe
unitwithout a Main Control.