14
® 2018 Valco Companies, Inc.
Circuit Breakers
The controller should be wired to an independent circuit breaker. Ideally, each equipment output channel should
have its own breaker to insure that tripping one breaker will not affect other devices in the ventilation system.
Motors must have a thermal overload protection device or impedance protection. The overload should auto-reset for
any essential equipment.
Power Surges
The Ventra Pro
TM
is protected against normal voltage surges, but lightning induced surges could damage the
equipment. We recommend use of a Deadbolt™ surge suppressor to reduce damage from lightning and other types
of power surges.
Lightning damage is not covered by the warranty.
Circuit Protection
Conduit and Connections
High voltage wires should enter the control enclosure from the
bottom so they can be easily connected to the relay terminals.
Low voltage sensor wiring can be brought in from the bottom or
side and connected to the input terminals near the top. Make sure
there are no frayed wires because the control board may press
against the wires when the controller’s cover is closed.
To avoid electrical shorts or damage due to moisture, you should
never run conduit openings through the top of the box. Conduit
and hubs should be corrosion resistant plastic or fiberglass.
Use only UL approved NEMA 4X rated conduit hubs. Connect
hubs to conduit before connecting to the control enclosure.
Use only liquid-tight strain-relief connectors to bring cables
into the box.
WARNING
1. A
QUALIFIED ELECTRICIAN
should perform all wiring to ensure
local and national codes are followed.
2. Disconnect all power before inspecting or servicing equipment.
3. Always use the proper wire size for wiring systems.
