Dometic RM2453 and, Installation And Operating Instructions Manual

3

ON/OFF, Fuel selector switch
Thermostat knob, Gas/Electric
Flame failure safety valve push-button
Piezo igniter
Flame indicator

A.

B.

C.

D.

E.

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).

•
•

•

•

•

The sealed cooling system must not be opened.  
It contains corroding chemicals under high 
pressure.

WARNING

!

REFRIGERATOR OvERvIEw

B

A

C

D

E

OFF ON

FUEL  SELECTOR

T

A

T

S

O

M

R

E

H

T

G

N

I

T

H

G

I

L

N

E

H

W

H

S

U

P

E

M

A

L

F

OFF

AC