Daikin MQFVI5 Installatie- en onderhoudshandleiding - Pagina 8

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Daikin MQFVI5 Installatie- en onderhoudshandleiding

1. Fan Powered Air Terminal Units with Electric Heat

Possible Conditions

● If the motor does not run:

1. With the power off, check for free rotation of blower

wheel using safety precautions.

2. Check for proper supply voltages. Disconnect switch (if

supplied) should be in the ON position.

3. Check fan fusing (if supplied).

4. Check for proper control signal, 24 VAC at fan contactor,

fan contactor energized

● Excessive Noise when fan motor runs:

1. Check for clearance problems with motor blower

components.

2. Check that all components are properly attached.

3. Verify that ductwork does not have leaks or loose

connections and that diffusers are not rattling or

balancing dampers are not generating noise.

4. Maximum CFM too high, or discharge static pressure

too low.

● Insufficient air flow:

1. Check for restrictions in ductwork.

2. Check for clogged water coils (if supplied)

3. Check for clogged intake filter (if supplied)

4. Re-adjust the fan speed control

5. Discharge static pressure too high.

IM 1102 • PARALLEL TERMINAL BOX

If repair or replacement of blower or motor is required, the

motor and fan should be removed as an assembly.

1. Disconnect power prior to removal.

2. Remove the bottom blower access panel.

3. Disconnect the two electrical leads from Terminal

Connection 1 and 2 on the motor.

4. Remove the bottom two lug screws holding the blower

assembly in place.

5. Loosen the top two lug screws holding the blower

assembly in place.

6. Lift the blower assembly upward to disengage the top

two lug screws.

DO NOT ALLOW THE BLOWER TO HANG FROM THE

ELECTRICAL CABLE .

To remove the motor from the blower:

1. Loosen the motor shaft set screw located on the blower

wheel hub.

2. Remove the three screws holding the motor to the fan

housing and slide the motor out of the fan housing.

3. Reverse steps 1 and 2 to place a motor in the fan housing.

Make certain that the set screw is tight prior to placing the

blower assembly into the fan powered terminal.

NOTE: DO NOT OVERTIGHTEN THE MOTOR MOUNTING

SCREWS – may result in excessive fan noise.

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