Fan Motor; Capacitor - Heat Controller BHD-301-G Service Manual

BHD-G Service Manual
11. Break vacuum by charging system from the high side with the correct amount of refrigerant specified. This
will prevent boiling the oil out of the crankcase.
NOTE: If the entire charge will not enter the high side, allow the remainder to enter the low side in small
increments while operating the unit.
12. Restart unit several times after allowing pressures to stabilize. Pinch off lines, cut and solder the ends.
Remove pinch off tool, and leak check the line ends.
COMPRESSOR MOTOR BURNOUT
1. Recover all refrigerant and oil from the system.
2. Remove compressor, capillary tube and filter drier from the system.
3. Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent, to remove all
contamination from system. Inspect suction and discharge line for carbon deposits. Remove and clean if
necessary.
4. Reassemble the system, including new drier, strainer and capillary tube.
5. Proceed with processing as outlined under hermetic component replacement.
ROTARY COMPRESSOR TROUBLESHOOTING AND SERVICE
Basically, troubleshooting and servicing rotary compressors is the same as a reciprocating compressor with a few
exceptions.
1. Because of the spinning motion of the rotary compressor, the mounts are critical. If vibration is present,
check the mounts carefully.
2. The electrical terminals on the rotary compressor are in a different order than the reciprocating compressors.
The terminal markings are on the cover gasket. Use the wiring diagram to insure correct connections.
REFRIGERANT CHARGE
1. The refrigerant charge is extremely critical. Measure charge carefully - as exact as possible to the nameplate
charge.
2. The correct method for charging the rotary compressor is to introduce liquid refrigerant into the high side of the
system with the unit off. Then start compressor and add the balance of the charge, gas only, into the low side.
The introduction of liquid into the low side, without the use of a capillary tube, will cause damage to the
discharge valve of the rotary compressor.

5.3 FAN MOTOR

A single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan. A self-
resetting overload is located inside the motor to protect against high temperature and high amperage conditions.
FAN MOTOR - TEST
1. Determine that capacitor is serviceable.
2. Disconnect fan motor wires from fan speed switch or system switch.
3. Apply "live" test cord probes on black wire and common terminal of capacitor. Motor should run at high
speed.
4. Apply "live" test cord probes on red wire and common terminal of capacitor. Motor should run at low speed.
5. Apply "live" test cord probes on each of the remaining wires from the speed switch or system switch to test
intermediate speeds.

5.4 CAPACITOR

A run capacitor is wired across the auxiliary and main winding of a
single phase permanent split capacitor motor such as the compressor
and fan motor. A single capacitor can be used for each motor or a dual
rated capacitor can be used for both.
The capacitor's primary function is to reduce the line current while
greatly improving the torque characteristics of a motor. The capacitor
also reduces the line current to the motor by improving the power factor
of the load. Run capacitor hook-up line side of the capacitor is marked
with a red dot and is wired to the line side of the circuit
Portable Dehumidifier with R-410A
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Heat Controller, Inc.