Fan Motor; Capacitor - Midea N series Service Manual

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 process tubes, cut
and solder the ends. Remove pinch off tool, and leak check the process tube ends.
9.2.4 Special procedure in the case of 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.
9.2.5 Rotary compressor special troubleshooting and service
Basically, troubleshooting and servicing rotary compressors is the same as on the reciprocating
compressor with only a few exceptions.
1. Because of the spinning motion of the rotary, the mounts are critical. If vibration is present,
check the mounts carefully.
2. The electrical terminals on the rotary are in a different order than the reciprocating
compressors. The terminal markings are on the cover gasket. Use your wiring diagram to insure
correct connections.
9.2.6 Refrigerant charge
1. The refrigerant charge is extremely critical. It must be measured charge carefully - as exact as
possible to the nameplate charge.
2. The correct method for charging the rotary is to introduce liquid refrigerant into the high side
of the system with the unit off. Then start compressor and enter 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.
NOTE: All inoperative compressors returned to Friedrich must have all lines properly plugged
with the plugs from the replacement compressor.
9.3

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.
9.3.1 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.
9.4

Capacitor

A run capacitor is wired across the auxiliary and main winding of a single phase permanent split
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