Refrigerator overview, Absorption refrigerator system, Control panel general advice and information – Dometic RM2553 User Manual
Page 3: Warning, A. b. c. d. e, Ba c d e
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ON/OFF, Fuel selector switch
Thermostat knob, Gas/Electric
Flame failure safety valve push-button
Piezo igniter
Flame indicator
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B.
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ABSORPTION REFRIGERATOR SySTEM
In an absorption refrigerator system, ammonia is liquefied in
the finned condenser coil at the top rear of the refrigerator.
The liquid ammonia then flows into the evaporator (inside the
freezer section) and is exposed to a circulating flow of hydro-
gen gas, which causes the ammonia to evaporate, creating a
cold condition in the freezer.
When starting the refrigerator for the very first time, the
cooling cycle may require up to four hours of running
time before the cooling unit is fully operational.
The tubing in the evaporator section is specifically sloped to
provide a continuous movement of liquid ammonia, flowing
downward by gravity through this section.
If the refrigerator is operated when it is not level and the ve-
hicle is not moving, liquid ammonia will accumulate in sec-
tions of the evaporator tubing. This will slow the circulation
of hydrogen and ammonia gas, or in severe cases, completely
block it, resulting in a loss of cooling.
Note! Any time the vehicle is parked for several hours with
the refrigerator operating, the vehicle must be levelled to
prevent this loss of cooling.
When the vehicle is moving, the levelling is not critical, as
the rolling and pitching movement of the vehicle will pass
to either side of level, keeping the liquid ammonia from ac-
cumulating in the evaporator tubing.
CONTROL PANEL
GENERAL ADvICE AND INFORMATION
Make sure defrosting is carried out periodically
The refrigerator should be kept clean and dry with the
door left open when it is not to be used for some time.
Ensure that liquids or items with a strong odour are well
packaged.
Service and maintenance must be done on a regular sched-
ule to keep the refrigerator operating properly, efficiently
and safely. The service should be performed by qualified
personnel only.
Avoid spraying water through the refrigerator vents while
washing your RV.
Sodium chromate is used for corrosion protection (less than
2 weight % of the coolant).
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The sealed cooling system must not be opened.
It contains corroding chemicals under high
pressure.
WARNING
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REFRIGERATOR OvERvIEw
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OFF ON
FUEL SELECTOR
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