Friedrich SH20J30B-A, SH14J30B-A User Manual

2002
HAZARDGARD

®

ROOM AIR CONDITIONER

Models

SH14J30B-A
SH20J30B-A

Service & Parts

Manual

AMERICA’S BEST AIR CONDITIONER

HG2002 (02/02)

TABLE OF CONTENTS

PAGE

Specifications .................................................................................................................... 3

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

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

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

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

Checking Compressor Efficiency ...................................................................................... 5

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

System Control Switch ...................................................................................................... 5

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

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

Low Ambient By-Pass 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

Troubleshooting SH14J30B-A ........................................................................................... 11

Troubleshooting SH20J30B-A ........................................................................................... 16

WIRING DIAGRAM

SH14J30B-A / SH20J30B-A ............................................................................................. 14

PARTS LIST

SH14J30B-A / SH20J30B-A Model Chassis Parts List ...................................................... 18

SH20J30B-A / SH20J30B-A Model Cabinet Parts List ...................................................... 19

2

SPECIFICATIONS

SH14J30B-A SH20J30B-A

BTUH 14000/14000 19000/18800

E.E.R. - Btu/watt 8.0/8.0 8.5/8.5

Volts 230/208 230/208

Hertz/Phase 60/1 60/1

Amperes 7.8/8.5 9.9/10.8

Total Watts 1750/1750 2235/2210

Fuse/Breaker Size 15 20

Fan RPM 1095 1095

Evaporator Air CFM 375 425

Dehumidification-Pts./hr. 4.0 5.7

Width 25-15/16” 25-15/16”

Height 15-15/16” 17-15/16”

Depth 27-3/8” 27-3/8”

Min. Ext. into Room 5-7/8” 5-7/8”

Min. Ext to Outside 16-15/16” 16-15/16”

Net Weight 129 Lbs. 177 Lbs.

Shipping Weight 147 Lbs. 199 Lbs.

Maximum Temperature Rating 1200 C (2480 F) Ignition Temperature Rating
for Class 1, Division 2, Group D

PERFORMANCE EVAPORATOR AIR OPERATING ELECTRICAL R-22 COMP.

DATA * TEMP° F PRESSURES RATINGS REFRIG. OIL

DISCHARGE TEMP SUCTION DISCHARGE AMPS LOCKED CHARGE IN CHARGE IN

AIR DROP °F ROTOR AMPS OUNCES FLUID OZ.

SH14J30B-A

SH14J30B-A

SH20J30B-A

SH20J30B-A

* Rating Conditions: 80° F. Room Air Temperature and 59% Relative Humidity with 95° F. Outside Air Temperature at 40% Relative Humidity.

56.78 23.22 79 296 7.8 43 28 32

8.5

52.83 27.16 79.5 282 9.8 52 39 32

10.4

3

COMPONENT OPERATION AND TESTING

WARNING

COMPRESSOR WINDING TEST

(See Figure 2.)

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:

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.

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

4

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.

GROUND TEST

FAN MOTOR (Figure 4)

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 inefficiency 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.

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.

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.

5

SYSTEM CONTROL SWITCH

(Figure 5)
This switch is double pole, single throw. Check
for continuity between terminals 2 and 3, and 5
and 6.

CAPACITOR – TEST

1. Remove the capacitor from the unit.

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

FIGURE 5 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 6.)

FIGURE 6 RUN CAPACITOR HOOK–UP

COMPRESSOR

FA N
MOTOR

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.

FIGURE 7
SENSING BULB
LOCATION

See Figure 7.

RED DOT

Thermostat

(Part No. 618-225-02)

RANGE:

RUN CAPACITOR

6

60° F ( ± 2° ) to 90° F( ± 4° )