Friedrich HazardGard SH14J30B-A, HazardGard SH20J30B-A, HazardGard SH20J50-A Service & Parts Manual

2004

Service & Parts M a nu al

HazardGard

®

Room Air Conditioner

MODELS

SH14J30B-A
SH20J30B-A

HG2003(1-03)

T ABLE OF CONTENTS

P AGE

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

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

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

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

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

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

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

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

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

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

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

Low Ambient Bypass V alve .............................................................................................................. 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

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

COMPRESSOR WINDING TEST (Figure 2.)

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:

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

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

LED indicates

contacts closed

when lit

Line side

Load side

FAN MOT OR (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.

2. Attach gages to the high and low sides of the
system.

3. St art the system and run a "cooling or
heating performance test."

If test shows:

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 MOT OR

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 st ate relays

are used to energize the compressor and fan motor .
Terminals 3 and 4 are the 208/230 volt line side.
T erminals 1 and 2 are load side cont acts.

FIGURE 5 SOLID ST A TE RELA Y

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 6)

CAPACITOR – TEST

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 CAP ACITOR HOOK–UP

COMPRESSOR

FAN
MOTOR

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
LOCA TION

RED DOT

RUN CAPACITOR

6

RANGE:

Thermostat

(Part No. 618-225-02)

60° F ( ± 2° ) to 90° F( ± 4° )