(1)
This is Dometic’s Manual Refrigeration Diagnosis and Troubleshooting program. In this program
we will discuss the way an absorption cooling unit operates, and the diagnostic procedures
used to troubleshoot the complete refrigerator system.
(2)
Before we begin extensive troubleshooting
procedures on the cooling unit, let’s take a few
minutes to see how it operates.
THE ABSORPTION SYSTEM
(3)
The sealed combustion unit contains a
mixture of ammonia, water and a rust
inhibiting agent. After this solution is
introduced into the coils, this unit is
pressurized with hydrogen gas. When
this system is in operation, the am-
monia vaporizes in the hydrogen atmo-
sphere and absorbs heat from inside
the refrigerator.
EVAPORATOR
GAS
TEMPERATURE
EXCHANGER
ABSORBER
VESSEL
BOILER
.
D-6-2
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