Specifications

Electrical Connections
Power Supply
A terminal block and strain relief bushing or a junction box
is provided for line voltage in power connection. See Ap-
pendix B for location.
The unit’s power line input power supply electrical require-
ments are as follows:
The units do not have a factory installed disconnect
switch. If disconnect is required field supply and install as
per NEC/Canadian Electrical Code. Use copper conductors
only.
All field wiring must comply with NEC and local require-
ments. In Canada, electrical connections must be in accor-
dance with CSA C22.1 Canadian Electrical Code Part One.
Field Connections
A wiring diagram is located inside the control box cover.
Low voltage terminal strips for remote control wiring in-
terface are provided on the exterior casing of the unit and
connected to the microprocessor control board for start-
ing, controlling sequence and monitoring. The Installer
must provide wiring for the controls and/or accessories
that may be supplied optionally or by others to the low
voltage terminal strips. See Appendix B for location.
The controls available for the Heat Recovery Ventilators,
their reference and type of connection are listed below.
For more information on the controls, wiring and terminal
connections see Appendix F.
The wall control is 12 VDC. Other terminals are 24 VAC or
dry contact control.
Notes:
1. Check the Controls and/or the Control Schematic
sections of the specification, optional and accessory
items shipped loose with or inside the unit for a list
of optional controls or wiring connections required to
the unit.
2. For the unit to start both ventilation and fan speed
calls are required except as noted. For ventilation
call the remote wall control, occupied timer/sensor,
manual switch or BMS contacts can be used. For fan
speed call the remote fan control, CO
2
ventilation
control, manual switch or BMS contacts can be used.
Wall Control Connection
• Four-wire LVT 24 gauge minimum (12 VDC).
Occupied Timer/Sensor Connection
• Makes a dry contact to operate unit. Timer requires
separate 24 VAC. Do not use timer with Xtra wall
control.
Remote Fan Control
• Requires single pole, double throw switch for
Low–Common–High.
• Makes dry contact for speed setting.
CO
2
Ventilation Control
• Makes dry contact.
• CO
2
ventilation requires separate 24 VAC.
Smoke Detector
• Makes dry contact.
• Smoke detector requires separate 24 VAC.
Fan Interlock Switch (FF)
• External fan control can be achieved by connecting
an external fan source (G) through dry contacts (FF)
on the microprocessor control board (terminals 6 and
7 on the low voltage terminal strips left side). These
contacts are closed on a call for ventilation or frost
control. See Forced Air System.
Table 3: Electrical Requirements
600 CFM 700 CFM 1,200 CFM
Voltage 120V 120V 120V
MCA 9.5 6.6 14.3
MOP 12.0 9.0 20.0
!
WARNING
When installed, the unit must be electrically grounded in
accordance with local codes or, in the absence of local
codes, with the National Electrical Code, ANSI/NFPA70,
and/or the Canadian Electrical Code CSA C22.1. Unit
cabinet must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an
electrical fault should occur. Failure to follow this warn-
ing could result in the Installer being liable for personal
injury of others.
VCES-HRV-IOM-1C – HRV600i, HRV700i, HRV1200i
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