Temspec Unit Ventilator IOM 2023-07-05
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ELECTRICAL CONNECTIONS
Use Copper Supply Wires Only
Use Supply Wires Suitable for 90◦C
Our unit Ventilators are available in the following voltages: 120/1/60, 208/1/60, 240/1/60,
277/1/60, 208/3/60, 480/3/60, 480/3/60 + N
The electrical circuit in the unit ventilator is highly dependent on the controller and control sequence
that is being utilized. A copy of the electrical schematic can be found folded in a pouch inside of the
unit ventilator or in the final job submittal.
Access to power is through the top of the unit (unless ordered differently). The unit has a single point
connection at the junction box (comes with disconnect switch) located inside the unit either above or
below the electrical box. Junction box may be located on the rebate inside the unit if the electrical
enclosure is door mounted. A circuit breaker may be used instead of the disconnect depending on
the amperage.
The electrical wiring must be in accordance with the current applicable national and local codes. A
qualified electrician must carry out the work. The electrical power to the unit should be disconnected
by opening the remote disconnect device prior to opening the access panel. The wiring diagram shall
be followed thoroughly when making connections to the unit.
A conduit is to be field installed in the unit such that hazardous voltage wiring is protected until it is
terminated. In the junction box or electrical enclosure.
Line Voltage Connections
Connect power leads from the field disconnect to the pigtails provided with the disconnect at the
junction box located inside the appliance and ground at the green screw located inside the junction
box.
If a circuit breaker is used, terminate the field provided line leads directly at the circuit breaker. The
neutral line to be terminated at the power distribution block and ground at the lug located beside the
circuit breaker inside the electrical enclosure.
Type and Ratings of Fuses and Circuit Breakers
Up to 30A time delay fuses are used. Up to 3 pole 100A circuit breakers are used.
Grounding
The unit Ventilator must be grounded for field connections wires up to #10 AWG using the green
ground screw inside the junction box. If the field connection wires are larger than # 10 AWG, the
grounding point is a ground lug installed in the electrical enclosure.
Low Voltage Connections
There is a sheet metal barrier between line voltage and extra low voltage circuits inside the
electrical enclosure. Low voltage connections are to be made to the terminal block or a controller
mounted on the low voltage side of the electrical enclosure. The unit is equipped with 1/2 inch flex
metal conduit to segregate wires entering unit. A conduit termination port is provided on the
electrical enclosure.
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