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Friedrich
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SH20L30-A
Owner's Manual
16 pgs328.86 Kb0
User Manual
20 pgs311.52 Kb0

Friedrich Sh20l50-a, Sh20l30-a, Sh15l30-a Owner's Manual

Service & Parts Manual
Room Air Conditioners
50 & 60 Hz Models
HG-SVC-PRTS (3-06)
SH15L30-A
SH20L30-A
SH20L50-A
TABLE OF CONTENTS
Specifi cations ......................................................................................................................................................... 3
Component Operation & Testing ...........................................................................................................................4
Thermal Overload ................................................................................................................................................. 4
Checking Compressor Effi ciency ........................................................................................................................... 4
Solid State Relay .................................................................................................................................................... 5
System Control Switch .......................................................................................................................................... 5
Run Capacitor ........................................................................................................................................................ 5
Low Ambient Bypass Valve ....................................................................................................................................6
Sealed Refrigeration System Repairs ................................................................................................................... 6
Hermetic Component Replacement ...................................................................................................................... 7
Special Procedure in the case of Compressor Motor Burn-Out .......................................................................... 7
Rotary Compressor Special Troubleshooting & Service ......................................................................................7
Refrigerant Charge ................................................................................................................................................. 7
Troubleshooting ................................................................................................................................................8-10
Wiring Diagram .................................................................................................................................................... 11
Cabinet Parts Diagram ........................................................................................................................................ 12
Chassis Parts Diagram ....................................................................................................................................... 13
2
FUSE
60 Hertz
BREAKER
RPM
Motor
CFM
Evap
REF.
R-22
Charge
Locked
Amps
ELECTRICAL RATINGS
Amps
OPERATING
PRESSURES
Sub-
Cooling
Amps
in OZ.
Rotor
Amps
Heat
Cool
(Lbs.)
Weight
Circulation
Room Sid e Air
T - D Fuse
Breaker or
Controls
Air Direction
Circuit Rating
16 250V - 15A 140 152
/
/16 250V - 15A 166 179
/16 250V - 15A 166 179
3
3
3
OPERATING TEMPERATURE CODE T3B
Heat
Super
Tem p
Liquid
Tem p
Suction
Tem p
Discharge
TEMP.
DEG. F
CONDENSER
TEMP. DEG. F
EVAPORATOR
Tem p.
TEMP. DEG. F
EVAPORATOR AIR
Discharge
E(in) E(out) Suction Discharge
Drop F.
Air
Moisture
Cooling Capacity Electrical Characteristics ( 60 Hertz) Energy
16 26
16 26
16 26
/
/
Removal
Effi ciency
(Pints/ Hr.) CFM
Ratio AHAM
Amps
AHAM Watts EER
(Inches)
Finished Hole
Thru-The-Wall
(Inches)
Outside Min. Max. Height Width Volts - Amps Net Shipping
Minimum
Extension
Into
Room
Minimum
Extension
Depth
Hood to
Louvers
Dimensions (Inches) Window Width
Depth
Overall
(BTU/Hr.- AHAM) Volts Rated
/
3
3
3
8 42 16
8 42 18
8 42 18
/
/
/
7
7
7
16 27
16 27
16 27
/
/
/
15
15
15
16 16
16 16
16 16
/
/
/
1
1
1
16 3
16 3
16 3
/
/
/
3
3
3
8 9
8 9
8 9
/
/
/
3
3
3
16 27
16 27
16 27
/
/
/
15
15
15
16 25
16 25
16 25
/
/
/
15
15
15
Height Width
60 Hz Models
SH15L30-A 54 26 52 56 206 129 61 108 16 98 76 258 8.2 - - 28.5 363 1100 15
SH20L30-A 46 34 46 46 125 196 52 97 8 28 75 271 10.1 - - 39.0 357 1100 20
50 Hz Model
Performance Data: Cooling
SH20L50-A 54 26 49 59 123 - - - - - - - 10.2 - - 34 434 1200 20
Product Specifications
SH15L30 15000/15000 230/208 7.9/8.7 1765/1765 8.5/8.5 4.0 8-way 375
SH20L30 19800/19500 230/208 10.0/10.9 2200/2167 9.0/9.0 5.7 8-way 375
Model
SH20L50 20000 220/240 10.2 2342 8.5 5.7 8-way 425
Installation Information
Model
SH15L30 15
SH20L30 17
SH20L50 17
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, 208/230 volt. All compressor motors are permanent split capacitor type, using only a running capacitor across the start and run terminal.
All compressors are internally spring mounted and externally 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 caused by:
1. A locked rotor.
2. Excessive running amps.
3. High discharge temperature.
4. Low refrigerant charge.
Testing Procedures
1. Terminal "C" and "S" – no continuity – open winding – replace compressor.
2. Terminal "C" and "R" – no continuity – open winding – replace compressor.
3. Terminal "R" and "S" – no continuity – open winding
- replace compressor.
4. Terminal "C" and the shell of the compressor – continuity – grounded motor – replace compressor.
5. Should continuity exist between 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 compressor body (clean point of contact, 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 shows:
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 across the start and run 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 208/230 volt solid state relays are used to
energize the compressor and fan motor. Terminals 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 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. 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 capacitors, 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 should 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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