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O
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PTIONAL
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For heating applications, the Air Booster may also be operated by the use of a line voltage
thermostatic switch which can be purchased from your local heating supply house or dealer. The
thermostatic switch will operate the Air Booster only when the temperature of the air in the duct is
above the per-set temperature. If a thermostatic switch is used, it is recommended it be located as
close to the main truck line duct as possible, for the fastest response to the change of air temperature
within the duct. (See Fig. 4.) However, follow the thermostatic switch manufacturer's
recommendations. NOTE: For air conditioning applications, a heating/cooling thermostatic switch with
manual changeover must be used.
1. Gas or oil-fired central furnaces may include refrigerant cooling coils, however, it must be
equipped with 120 VAC single phase blower motors. AIR BOOSTER SHOULD NOT BE
WIRED IN PARALLEL WITH 240 VAC BLOWER MOTORS.
2. The basic furnace wiring and components should not be disturbed except for wiring
interconnection of the Air Booster and furnace blower at a splice box in the furnace.
3. The rating of the furnace blower motor controller must be adequate to control blower motor
and Air Booster motor. The Air Booster motor is rated at 0.50 amps.
Important: Blower motor controller should not be a variable speed tap type, solid state speed
control or any other type not suitable for dual motor control.
UNIT WIRING INSTRUCTIONS
1. For electrical supply connections, use wires suitable for at least 90ºC when Booster is used on a
heated duct system.
2. Electrical conduit must be routed away from warm air system ducts. Use adequate supports if
necessary.
3. The two black motor lead wires that are interchangeable are connected to power source. The
green wire is used for grounding purposes only.
4. The existing short circuit and ground fault protection for the furnace blower motor should be of a
size and type which will adequately protect the Air Booster motor. Refer to Section 430-53 of the
National Electrical Code.
5. The wiring from the furnace to the Air Booster must be 14 AWG and the furnace should be
protected by over current protection (fuses or circuit breakers) rated 15 amperes or less (as
applicable for 14 AWG conductors).
Important: Refer to section 430-53 (d) and Table 310-16 for the National Electrical Code for additional limitations.
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Figure 4
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