Friedrich SH15L30-A, SH20L50-A, SH20L30-A User Manual

Service & Parts Manual

2005

Room Air Conditioners

50 & 60 Hz Models

HG-SVC-PRTS-05 (4-05)

SH15L30-A

SH20L30-A

SH20L50-A

TABLE OF CONTENTS

PAGE

Speciﬁ cations ................................................................................................................................... 3

Performance Data ............................................................................................................................ 3

Component Operation & Testing ...................................................................................................... 4

Compressors .................................................................................................................................... 4

Thermal Overload ............................................................................................................................ 4

Checking Compressor Efﬁ ciency ...................................................................................................... 5

Fan Motor ......................................................................................................................................... 5

Solid State Relay .............................................................................................................................. 5

System Control Switch .................................................................................................................... 6

Run Capacitor ................................................................................................................................... 6

Thermostat ....................................................................................................................................... 6

Low Ambient Bypass Valve .............................................................................................................. 8

Sealed Refrigeration System Repairs .............................................................................................. 8

Hermetic Component Replacement ................................................................................................. 9

Special Procedure in the case of Compressor Motor Burn-Out ...................................................... 9

Rotary Compressor Special Troubleshooting & Service ................................................................ 10

Refrigerant Charge ......................................................................................................................... 10

Troubleshooting .................................................................................................................. 11-13

Wiring Diagram ............................................................................................................................... 14

Cabinet Parts Diagram .................................................................................................................. 15

Chassis Parts Diagram .................................................................................................................. 16

Parts List .................................................................................................................................... 17-19

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

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

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

8 42 16

8 42 18

16 27

16 16

16 3

8 9

16 27

16 25

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

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.

FIGURE 2 COMPRESSOR WINDING TEST

All compressors are internally spring mounted and externally mounted on rubber isolators.

Line Voltage Overload

The compressor is equipped with an internal line voltage overload. 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.

FIGURE 1 INTERNAL OVERLOAD

LINE BREAK INTERNAL OVERLOAD

OHMMETER

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.

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:

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

CHECKING COMPRESSOR EFFICIENCY

The reason for compressor inefﬁ ciency is normally due to broken 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.

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.

The motor is totally enclosed and is protected with a line voltage 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.

3. Start the system and 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.

FIGURE 5 SOLID STATE RELAY

Line side

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

CAPACITOR – TEST

1. Remove the capacitor from the unit.

2. Check for visual damage such as bulges, cracks, or leaks.

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.

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 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

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.

THERMOSTAT

A cross ambient thermostat is used to maintain the desired comfort level. The thermostat reacts only to a change in temperature at the bulb location. Important to the successful operation of the unit is the position of the sensing bulb in relation to the evaporator (see Figure 8).

FIGURE 8 SENSING BULB LOCATION

RED DOT

RANGE:

Thermostat

RUN CAPACITOR

(Part No. 618-225-02)

60° F ( ± 2° ) to 90° F( ± 4° )

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