ERV
HE2XRT
RENEWAIRE.COM
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
1.800.627.4499
12
INSTALLATION
CONTROL WIRING
SCHEMATICS
NOTE:
The simplified schematics below show only the relevant portions of the low-voltage control circuit
in the ERV unit and representational external control approaches. See the complete unit schematics
elsewhere in this manual.
CONTROL WIRING EXAMPLES BY TYPE OF APPLICATION
A.
Single 2-wire Control:
Use schematic below if the control requires no power from the unit to operate
and acts like a simple on/off switch. The control must not supply any power to the ERV unit. Install
jumper (provided) between terminals 2 & 3. Connect the control’s contacts to terminals 1 & 4 to
operate the ERV’s Isolation Relay for OA/FA Blower. Install jumper between terminals 4 & 5 to operate
the ERV’s Isolation Relay for the RA/EA Blower.
C.
Control Sending 24VAC “On” Signal (from an external power source) to ERV:
Make sure jumper
is NOT installed between Terminals 2 & 3. Now you safely can apply 24VAC to the Terminals 3 & 4 to
operate the ERV’s Isolation Relay for OA/FA Blower. Install jumper (provided) between terminals 4 & 5
to operate the ERV’s Isolation Relay for the RA/EA Blower.
B. Single 2-wire Control on separate Power Supply, no power present at Control Output:
Wire as
shown for the Single 2-wire control (A. above).
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
C
24VAC FROM AN EXTERNAL SOURCE
A
A SWITCH OR NON-POWERED CONTROL
USING UNIT’S 24VAC POWER SUPPLY
D.
Control operating on Unit’s 24VAC Power Supply:
24VAC power is available at the Terminals 1 & 2.
CAUTION: external control system should not draw more than 8VA. Install jumper (provided) between
terminals 2 & 3. Connect the switched output of the Control to Terminal 4 to operate the ERV’s Isolation
Relay for OA/FA Blower. Install jumper between terminals 4 & 5 to operate the ERV’s Isolation Relay for
the RA/EA Blower.
D
AN EXTERNAL CONTROL USING
UNIT'S 24VAC POWER SUPPLY
