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3.13.2 SELECTING INDOOR BLOWER MOTOR SPEED
The (-)F1P and (-)F1T air-handlers must be configured in the field to assure proper air-
flow is delivered for the particular application it is being used in. Refer to the AIR-FLOW
PERFORMANCE DATA in Section 3.13.3 to determine which speed tap is appropriate
for the application.
3.13.2.1 (-)F1P MODELS (PSC MOTOR)
(-)F1P models are designed to be matched to a specific capacity outdoor unit, 1.5, 2.0,
2.5, and 3.0 tons. They have PSC motors with 2 blower motor speed taps, low speed
for applications with an external static pressure of up to 0.3" W.C. and high speed for
applications with an external static pressure from 0.3" to 0.7" W.C.
All models are
shipped from the factory wired for high speed operation.
The speed selection is made on the Blower Control Board. To change from high speed
to low speed, remove the BLACK motor lead from the COM terminal, remove insulat-
ed cap from the end of the RED motor lead located in the control box and plug it into
the terminal on the end of the BLACK motor lead to prevent it from shorting to ground.
Attach RED wire to the COM terminal on the Blower Control Board.
3.13.2.2 (-)F1T MODELS (CONSTANT TORQUE ECM MOTOR)
Each (-)F1T model is designed to be matched with 2 different outdoor unit capacities,
1.5 - 2.0 tons and 2.5 - 3.0 tons. (-)F1T models have constant torque ECM motors with
5 blower motor speed taps, labeled 1 through 5. Speed selections are made on a termi-
nal block located on the motor housing. Speed tap T1 is always dedicated to continuous
fan operation and delivers approximately 50% of the speed tap T4 air-flow. Speed taps
T2 & T4 are for applications with an external static pressure up to 0.3" W.C. (speed tap
T2 for lower tonnage & speed tap T4 for higher tonnage). Speed taps T3 & T5 are for
applications with an external static pressure from 0.3 to 0.7" W.C. (speed tap T3 for
lower tonnage & speed tap T5 for higher tonnage). All models are shipped with speed
tap T5 selected. For optimum performance, efficiency, dehumidification, and the lowest
possible noise level, select the appropriate speed tap for the specific application it is
being installed in. The external filter pressure drop must be included in the external stat-
ic pressure when selecting a blower motor speed.
To change the indoor blower speed on (-)F1T air-handlers, move the BLUE wire con-
nected to terminal T5 located on the motor housing to the appropriate terminal (T2 – T5)
on the same terminal block.
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