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Troubleshooting

Failure of Refrigeration

Failure of refrigeration does not necessarily indi-

cate that the cooling system is defective. Other fac-

tors governing its operation must be checked.

If the refrigerator has been operating on gas and a

loss of cooling is noted, convert the refrigerator to

electric operation, AC power (See "Start-Up Instruc-

tions - AC Electric Operation"). If the refrigerator has

been operating on electric, switch it to gas operation.

This will determine if a component failure in the elec-

tric or gas controls is causing the cooling fault.

After the refrigerator has been converted from one

power source to the other (gas to electric, or electric

to gas) allow several hours to assure the unit is cy-

cling properly. At the end of the period the fins

should start to cool providing the following items

have been checked out thoroughly.

1. The refrigerator is level in each direction.

2. The controls have been properly set for the

power source utilized.

3. The power source is at the correct 10.5 - 11

inches water column for gas at the refrigerator’s

pressure tap (Figure 2) and 108-132 volts AC for

electric or 11.5 to 15.4 volts DC.

4. The upper and lower vents are not obstructed

restricting ventilation.

If no cooling is evident after a reasonable time pe-

riod, the cause of failure may be due to a blocked

system. This blockage is caused when the refrigera-

tor is operated for extended periods in an off-level

condition beyond the range of 3 degrees left to right

and 6 degrees front to back. This does not mean the

system is non-functional, but requires the refrigera-

tor to be removed from the vehicle and placed on its

right side when facing the front for a minimum of one

hour. This will allow the ammonia and water to mix

with one another which is necessary in the absorp-

tion system operation.

Once the system has been relieved of its blockage,

operation on AC should once again be initiated for a

reasonable time period to determine if the cooling

process has been restored. If after this period the

fins have no indication of cooling on either gas or

electric the refrigerator will have to be replaced.

Refrigerator Not Cooling on AC

USE EXTREME CAUTION WHEN WORKING ON

THE AC ELECTRICAL COMPONENTS OF THE

REFRIGERATOR. BEFORE REPLACING ANY

ELECTRICAL COMPONENT, DISCONNECT THE

AC POWER SOURCE TO THE REFRIGERATOR.

ELECTRICAL CURRENT CAN CAUSE SEVERE

ELECTRICAL SHOCK OR DEATH.

If the refrigerator is not cooling with the Selector

switch in the AC mode - yet cools in the gas mode -

the AC heater is probably not energized. Check the

following:

1. Check for 110 volts to the heater at AC Termi-

nals 1 and 2 (See Figure 3 for location).

Connect Manometer

to Pressure Tap Tee

Figure 2

Figure 3 - Identification Terminal Block Connections

WARNING

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 22 23

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