weights (clips) on blower wheel vanes. Do not drop or bend
wheel as balance will be affected.
To reassemble unit, proceed as follows:
1. Place motor with mount attached on flat, horizontal surface
with shaft up.
2. Set inlet ring on top of motor mount grommets. Center inlet
ring flush on all 3 grommets.
3. Slide blower wheel onto motor shaft with setscrew upward
and aligned with shaft flat portion. Vertically position wheel
along shaft to position marked during disassembly.
NOTE:
If previous shaft was not marked or if replacing previous
motor, set blower wheel position by sliding blower wheel along
motor shaft to 1-1/8 in. above rubber grommets. (See Fig. 34.)
4. Hold blower wheel in place and carefully tighten setscrew.
5. Position motor and blower wheel assembly to blower housing
as originally oriented.
6. Secure motor mount to blower housing using bolts previously
removed.
7. Attach green wire to blower housing with screw.
8. Connect electrical and capacitor leads to original terminals.
9. Replace blower access door and tighten all 4 screws.
10. Reinsert disconnect pullout only after blower access door is
secured. Test blower for proper operation.
FD3A SERVICE AND TROUBLESHOOTING
Before installation or servicing system, always turn off main
power to system. There may be more than 1 disconnect
switch. Turn off accessory heater power if applicable. Elec-
trical shock can cause personal injury or death.
Step 1—Fan Motor
The motor is 2-speed direct drive. High-speed lead is black,
low-speed lead is red, and common lead is yellow.
NOTE:
Unused fan speed leads must be tapped off to prevent
direct short to cabinet surface.
The motor is turned on through 2 different routes. The first occurs
when thermostat calls for the fan in cooling, heat pump, or
fan-only mode. A 24-vac signal is sent to relay, causing relay to
close its normally-open contacts, turning fan on. The second
occurs when there is a call for electric heat. A 24-vac signal is sent
to heater sequencer, causing it to close, directing 230v through the
normally-closed contact of fan relay, turning fan on. The fan
remains on until sequencer opens. Refer to FD3A typical wiring
diagram. (See Fig. 35.)
Step 2—Electric Heater Service
Service can be completed with heater in place. Shut off power
before servicing.
LIMIT SWITCH
Refer to Electric Heater Function and Troubleshooting section of
this manual.
SEQUENCER
Refer to Electric Heater Function and Troubleshooting section of
this manual.
TRANSFORMER
A 60-VA transformer supplies 24-v power for control circuit.
Check for 208/230-v on primary side of transformer. If present,
check for 24-v on secondary side. Replace transformer if faulty.
NOTE:
Transformer is fused. Do not short circuit.
FAN RELAY
Relay coil is 24 volts. Check for proper control voltage. Replace
relay if faulty.
HEATER REMOVAL
Disconnect wiring, remove 2 sheet metal screws, and pull heater
out through open hinged access panel. When replacing heater,
ensure orientation of heater element is same as when removed.
Step 3—Cleaning or Replacing Refrigerant
Flow-Control Device
1. Pump down outdoor unit. Close service valves at outdoor unit.
Fig. 34—FF1A/FF1B/FF1C Motor, Inlet Ring, and Blower Wheel Assembly
A86006
GROMMET
BLOWER
WHEEL
INLET
RING
MOTOR
1
1
⁄
8
″
43