ERV
HE2XRT
13
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
CONTROL WIRING
SCHEMATICS
E. Control System with 2 Non-powered Relay Contacts:
Use this schematic if the external control
system provides no voltage or current at its output contacts. Install jumper (provided) between
terminals 2 & 3. Connect one side of each of the output contacts to Terminal 1. Connect the other side
of the output contact to control the FA Blower to Terminal 4, and the output contacts to control the
EA Blower to Terminal 5.
F.
Control System Sending two 24VAC “On” Signals from an external power source:
Make sure the
jumper is NOT installed between Terminals 2 & 3. Now you safely can apply one of the 24VAC signals
to Terminals 3 & 4 to operate the ERV’s isolation relay for the Fresh Air Blower. Apply the second 24VAC
signal to Terminals 3 & 5 to operate the ERV’s isolation relay for the Exhaust Blower (make sure the
polarity of each wire connected to Terminal 3 is the same).
INSTALLATION
NOTE:
Because the ERV’s Motor Starters will only be operating once the Dampers are open, the power draw of
the Damper Actuators is allowed to be as much as 35VA while opening (including power draw of the external
control system, if any). However, the power draw of the fully-opened (stalled) Actuators (and external
control system if any) must be less than 8VA. (Most damper actuators have much lower power draws.)
G.
Control System Operating Isolation Dampers with End Switches
: Use Isolation Dampers with
electrically separate end switches. The end switches are used to separately control the ERV unit’s
Isolation Relays. This ensures that each damper is open before the respective blower starts up.
F
TWO EXTERNAL RELAY CONTACTS SUPPLYING
24VAC FROM AN EXTERNAL SOURCE
E
A SWITCH OR NON-POWERED CONTROL
USING UNIT'S 24VAC POWER SUPPLY
Make sure the control provides
no voltage or current at its output
terminals.
CAUTION
Supply only 24VAC (not VDC) from
a Class II Power Source.
CAUTION
