Performance Data ..................................................................................................................................................3
Checking Compresso r Effi cien cy ...........................................................................................................................4
Fan Motor ............................................................................................................................................................... 5
Solid State Relay ....................................................................................................................................................5
System Control Switch ..........................................................................................................................................5
Run Capacitor ........................................................................................................................................................5
Sealed Refrigeration System Repairs....................................................................................................................6
Cabinet Parts Diagram ........................................................................................................................................ 12
Chassis Parts Diagram ....................................................................................................................................... 13
Parts List .........................................................................................................................................................14-1 5
Due to continuing engineering research and technology, specifications are subject to change without notice.
Manufactured under U.S. Design Patent DES 368, 306 decorative front; Utility Patent 5, 622, 058
MAXIMUM outdoor ambient operating temperature is 130°F (54°C).
MAXIMUM TEMPERATURE RATING FOR CLASS I, DIVISION 2, GROUPS A,B,C,D
3
COMPONENT OPERATION AND TESTING
WARNING
DISCONNECT ELECTRICAL POWER TO THE
UNIT BEFORE SERVICING OR TESTING
COMPRESSORS
Compressors are single phase, 208/23 0 volt. All c ompres sor
motors are permanent split capacitor type, using only a running
capacitor across the start and run terminal.
All compressor s are internally spr ing mounted and exter nally
mounted on rubber isolators.
Line Voltage Overload
The compressor is equipped with an internal line voltage over-
load. This overload is embedded in the windings of the motor
to sense the motor temperature. The overload will open and
disconnect the power to the motor due to high temperatures
cause d b y :
1. A locked rotor.
2. Excessive running amps.
3. High discharge temperature.
4. Low refrigerant charge.
Testing Procedures
1. Ter minal "C" and "S" – no continuity – open w inding
– replace compressor.
2. Ter minal "C" and "R" – no continuit y – open winding
– replace compressor.
3. Terminal "R" and " S" – no continuity – open winding
- replace compressor.
4. T erminal "C" and the shell of the compressor – continuity
– grounded motor – replace compressor.
5. Should continuity exist bet ween terminals "R" and "S",
but not between terminals "C" and " S" and " C" and " R",
the internal overload may be open. If the compressor is
extremely hot, allow it suffi cient time to cool. It may require
as long as one hour for the compressor to cool suffi ciently
for the internal overload to close.
GROUND TEST
Use an ohmmeter set on its highest scale. Touch one lead to
the co mpresso r body ( cle an poin t of co ntact, as a good connection is a must) and the other probe in turn to each compressor
terminal. (See Figure 3. ) If a reading is obtained, the compressor
is grounded and must be replaced.
FIGURE 3 TYPICAL GROUND TEST
FIGURE 1 INTERNAL OVERLOAD
LINE BREAK
INTERNAL OVERLOAD
OHMMETER
COMPRESSOR WINDING TEST (Figure 2.)
Remove the compressor terminal box cover and disconnect the
wires from the terminals. Using an ohmmeter, check continuity
across the following:
FIGURE 2 COMPRESSOR WINDING TEST
CHECKING COMPRESSOR EFFICIENCY
The reason for compressor ineffi ciency is normally due to bro-
ken or damaged suction and/or discharge valves, reducing the
ability of the compressor to pump refrigerant gas.
This condition can be checked as follows:
1. Install a piercing valve on the suction and discharge or liquid
process tube.
2. Attach gages to the high and low sides of the system.
3. Start the system. Run a "cooling or heating performance test."
If test sh ows:
A. Below normal high side pressure.
B. Above normal low side pressure.
C. Low temperature difference across the coil.
The compressor valves are faulty - replace the compressor .
4
FAN MOTOR (Figure 4)
A 230 volt single phase permanent split capacitor motor is
used to drive the evaporator blower and condenser fan. A
running capacitor is wired acros s the star t and r un terminals
of the motor.
CAPACITOR, RUN
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 motors. A single capacitor can be used for
each motor or a dual rated capacitor can be used for both.
The motor is totally enclosed and is protected with a line volt-
age overload located internally of the motor. The motor shaft
is stainless steel to resist corrosion.
FIGURE 4
FAN MOTOR
FAN MOTOR – TEST
Disconnect power to the unit.
1. Determine that the capacitor is serviceable.
2. Disconnect the black lead from the circuit board.
3. Apply "live" test cord leads to the common terminal of
the capacitor and the black lead. The motor should run
at high speed.
SOLID STATE RELAY (Figure 5)
Two 50 amp rated 20 8/230 volt solid state relays are used to
energize the compressor and fan motor. T erminals 3 and 4 are the
208/230 volt line side. Terminals 1 and 2 are load side contacts.
The capacitor’s primary function is to reduc e the line current
while greatly improving the torque characteristic s of a motor.
The capacitor also reduces t he line current to the motor by
improving the power factor of the load. The line side of the
capacitor is marked with a red dot and is wired to the line side
of the circuit (see Figure 7.)
FIGURE 7 RUN CAPACITOR HOOK–UP
COMPRESSOR
FAN
MOTOR
RED DOT
RUN CAPACITOR
CAPACITOR – TEST
1. Remove the capacitor from the unit.
2. Check for visual damage such as bulges, cracks, or
leaks.
FIGURE 5
Line side
SOLID STATE
RELAY
Load side
LED indicates
contacts closed
when lit
SYSTEM CONTROL SWITCH (Figure 6)
This switch is double pole, single throw. Check for continuity
between terminals 2 and 3, and 5 and 6.
FIGURE 6
SWITCH, ON-OFF
3. For dual rated capacitor s, apply an ohmmeter lead to
the common (C) terminal and the other probe to the
compressor (HERM) terminal. A satisfactory capacitor will
cause a defl ection on the pointer, then gradually move back
to infi nity.
4. Reverse the leads of the probe and momentarily touch the
capacitor terminals. The defl ection of the pointer sh ould be
two times that of the fi rst check if the capacitor is good.
5. Repeat steps 3 and 4 to check the fan motor capacitor.
NOTE: A shorted capacitor will indicate a low
resistance and the pointer will move more to the “ 0”
end of the scale and remain there as long as the
probes are connected. An open capacitor will show
no movement of the pointer when placed across the
terminals of the capacitor.
5
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