Friedrich SH15L30-A User Manual

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Service & Parts Manual

2005

Room Air Conditioners

50 & 60 Hz Models

SH15L30-A

SH20L30-A

SH20L50-A

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

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

2

Performance Data: Cooling

 

EVAPORATOR AIR

EVAPORATOR

 

 

 

 

 

 

OPERATING

ELECTRICAL RATINGS

R-22

 

 

BREAKER

 

TEMP. DEG. F

TEMP. DEG. F

CONDENSER

 

 

 

 

 

PRESSURES

REF.

 

 

FUSE

 

Discharge

Suction

Liquid

Super

Sub-

 

 

 

Evap

Motor

 

 

 

 

 

 

 

 

 

 

 

 

 

Discharge

Temp.

 

 

TEMP.

Temp

Temp

Temp

Heat

Cooling

 

 

Amps

Amps

Locked

Charge

CFM

RPM

60 Hertz

 

E(in)

E(out)

DEG. F

Suction

Discharge

Rotor

 

Air

Drop F.

 

 

 

 

 

 

 

 

 

 

Cool

Heat

Amps

in OZ.

 

 

Amps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SH20L50-A

54

26

49

59

123

-

-

-

-

-

-

-

10.2

-

-

34

434

1200

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Product Specifications

 

Cooling Capacity

Electrical Characteristics (60 Hertz)

Energy

Moisture

Air Direction

Room Side Air

 

 

 

 

 

Efficiency

Removal

Controls

Circulation

 

 

 

 

 

Ratio AHAM

 

 

 

 

 

 

Amps

 

 

(Pints/ Hr.)

 

CFM

Model

(BTU/Hr.- AHAM)

Volts Rated

AHAM

Watts

EER

 

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

 

 

 

 

 

 

 

 

 

SH20L50

20000

220/240

10.2

2342

8.5

5.7

8-way

425

 

 

 

 

 

 

 

 

 

Installation Information

 

 

 

Dimensions (Inches)

 

Window Width

Thru-The-Wall

Circuit Rating

 

Weight

 

 

 

 

 

 

 

(Inches)

Finished Hole

Breaker or

 

(Lbs.)

 

 

 

 

 

 

 

 

 

(Inches)

T - D Fuse

 

 

 

 

 

 

Depth

Minimum

 

 

 

 

 

 

 

 

 

 

 

Depth

Extension

Minimum

 

 

 

 

 

 

 

Model

 

 

Hood to

Into

Extension

 

 

 

 

 

 

 

Height

Width

Overall

Louvers

Room

Outside

Min.

Max.

Height

Width

Volts - Amps

Net

Shipping

SH15L30

15 15/16

25 15/16

27 3/8

9 3/16

3 1/16

16 15/16

27 7/8

42

16 3/16

26 3/16

250V - 15A

140

152

SH20L30

17 15/16

25 15/16

27 3/8

9 3/16

3 1/16

16 15/16

27 7/8

42

18 3/16

26 3/16

250V - 15A

166

179

SH20L50

17 15/16

25 15/16

27 3/8

9 3/16

3 1/16

16 15/16

27 7/8

42

18 3/16

26 3/16

250V - 15A

166

179

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 OPERATING TEMPERATURE CODE T3B

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 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

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

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 sufficient time to cool. It may require as long as one hour for the compressor to cool sufficiently for the internal overload to close.

4

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.

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.

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.

FIGURE 5 SOLID STATE RELAY

Line side

Load side

LED indicates contacts closed when lit

5

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, 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

RED DOT

RUN CAPACITOR

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 deflection on the pointer, then gradually move back to infinity.

4.Reverse the leads of the probe and momentarily touch the capacitor terminals. The deflection of the pointer should be two times that of the first 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.

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

RANGE:

Thermostat

(Part No. 618-225-02)

60° F ( ± 2° ) to 90° F( ± 4° )

6

TEST

Remove the wires from the thermostat. Turn the thermostat to its coldest position. Check to see if there is continuity between the two terminals. Turn the thermostat to its warmest position. Check continuity to see if the thermostat contacts open.

Note: The temperature must be within the range listed to check the thermostat. Refer to the troubleshooting section in this manual for additional information on thermostat testing.

7

LOW AMBIENT BYPASS VALVE (Figure 9)

The HazardGard unit is designed to operate at low outside ambient temperatures. This is accomplished by the use of a bypass valve installed in the refrigeration circuit. The valve is connected between the discharge line at the compressor and the suction process tube. The valve responds to suction pressure which, when reduced in the system, causes the valve to open and bypass hot gas from the high pressure side to the low pressure side of the system. The hot gas entering the compressor mixes with the cool gas returned through the suction line, thus increasing the suction pressure. The valve is preset to open when the suction pressure reaches 50 psig. This pressure setting cannot be altered. The system can be operated at outdoor temperatures as low as 45° F before the evaporator coil will begin to accumulate frost.

To determine if the valve operates, block the return air to the evaporator coil. Turn on the unit and touch the tube at the bypass valve outlet which connects to the suction process tube. When the low side pressure reaches approximately 50 psig, the valve will begin to open and the tube will get hot. This method will determine if the valve is responding to the suction pressure change.

FIGURE 9

LOW AMBIENT Bypass

VALVE

SEALED REFRIGERATION SYSTEM REPAIRS

EQUIPMENT REQUIRED:

1.Voltmeter

2.Ammeter

3.Ohmmeter

4.E.P.A Approved Refrigerant Recovery System

5.Vacuum Pump (capable of 200 microns or less vacuum).

6.Acetylene Welder

7.Electronic Halogen Leak Detector (G.E. Type H-6or equivalent).

8.Accurate refrigerant charge measuring device such as:

a.Balance Scales - 1/2 oz. accuracy

b.Charging Board - 1/2 oz. accuracy

9.High Pressure Gauge - (0-400lbs.)

10.Low Pressure Gauge - (30" - 150 lbs.)

11.Vacuum Gauge - (0-1000microns)

EQUIPMENT MUST BE CAPABLE OF:

1.Recovering CFC’s as low as 5%.

2.Evacuation from both the high side and low side of the system simultaneously.

3.Introducing refrigerant charge into the high side of the system.

4.Accurately weighing the refrigerant charge actually introduced into the system.

5.Facilities for flowing nitrogen through the refrigeration tubing during all brazing processes.

8

HERMETIC COMPONENT REPLACEMENT

The following procedure applies when replacing components in the sealed refrigeration circuit or repairing refrigerant leaks. (Compressor, condenser, evaporator, capillary tube, refrigerant leaks, etc.)

1.Recover the refrigerant from the system at the process tube located on the high side of the system by installing a line tap on the process tube. Apply the gauge from the process tube to EPA approved gauges from the process tube to the EPA approved recovery system. Recover the CFC’s in the system to at least 5%.

2.Cut the process tube below the pinch off in the suction side of the compressor.

3.Connect the line from the nitrogen tank to the suction process tube.

4.Drift dry nitrogen through the system and unsolder the more distant connection first. (Filter drier, high side process tube, etc.)

5.Replace the inoperative component, and always install a new filter drier. Drift dry nitrogen through the system when making these connections.

6.Pressurize the system to 30 PSIG with proper refrigerant and boost the refrigerant pressure to 150 PSIG with dry nitrogen.

7.Leak test the complete system with the electric halogen leak detector, correcting any leaks found.

8.Reduce the system to zero gauge pressure.

9.Connect the vacuum pump to the high side and low side of the system with deep vacuum hoses, or copper tubing. (Do not use regular hoses.)

10.Evacuate the system to an absolute holding pressure of 200 microns or less.

NOTE: This procedure can be sped up by the use of heat lamps, or by breaking the vacuum with refrigerant or dry nitrogen at 5,000 microns. Pressure system to 5 PSIG and leave in the system a minimum of 10 minutes. Recover refrigerant, and proceed with evacuation to a pressure of 200 microns or a minimum of 10%.

11.Break the vacuum by charging the 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 the unit several times after allowing pressures to stabilize. Pinch off the process tubes, cut and solder the ends. Remove the pinch off tool, and leak check the process tube ends.

SPECIAL PROCEDURES IN THE CASE OF COMPRESSOR MOTOR BURNOUT

1.Recover all refrigerant and oil from the system.

2.Remove the compressor, capillary tube and filter drier from the system.

3.Flush the evaporator, condenser and all connecting tubing with dry nitrogen, or equivalent, to remove all contamination from the system. Inspect the suction and discharge lines for carbon deposits. Remove and clean if necessary.

4.Reassemble the system, including a new drierstrainer and capillary tube.

5.Proceed with processing as outlined under hermetic component replacement.

9

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 the correct connections.

REFRIGERANT CHARGE

1.The refrigerant charge is extremely critical. Measure the charge carefully and as exactly 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 the 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.

10