Install Instructions

14
Mechanical Timers Installation 99-101
The Mechanical Timer is a 2 wire “dry
contact” timer. A jumper wire must be
connected between 2 (ON) and 3 (RED).
Connect the 2 timer wires to ON and HI.
2 wire timers require a
jumper wire between
ON and RED on the
terminal block
Connect the 2
wires from the
timer to ON and HI on the terminal block.
HRV Terminal Block
Wire
Connector
Furnace
Terminal Strip
Furnace
Thermostat
Interlocking the HRV to an Air Handler or Furnace
Blower
Connecting the HRV as illustrated will ensure the air handler/
furnace blower motor is operating whenever the HRV is venting.
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.
Setting “Standby” When Using a Main Control
The HRV will be “fully-off” when the off position is selected on the
 Timers mount in standard electrical boxes
 Use 3 wire 20 gauge (min.) 100 ft length (max.) low voltage wire and multiple timers individually wired back to the unit.
Caution:
 Consideration should be given to competing airflows when connecting the HRV in conjunction with an air handler/furnace
blower system.
 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”.
Attention/Caution
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.
Operating the HRV With Dry Contact Controls
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)