Dometic RM1350 User Manual download pdf (Page 6)

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AUTOMATIC TRAVEL LATCH

The refrigerator is equipped with a travel latch that automati-

cally locks the refrigerator’s doors when the RV’s engine is

running. When the RV’s engine is turned off, the latch unlocks

the doors.

To open one of the refrigerator doors while the enginge is run-

ning, the travel latch must be manually unlocked. To unlock,

simply push the shutter to the left. The doors will automatically

lock again after 5 seconds.

IF THE REFRIGERATOR HAS BEEN TURNED OFF

When the engine is turned on, a signal through the alternator

(D+) activates the travel latch which in turn locks the refrigera-

tor doors. When turning off the engine, the doors will not open

automatically as usual because the refrigerator is turned off. In

order to switch on the refrigerator, the doors must be manually

unlocked.

ABSORPTION COOLING 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 hydrogen gas,

which causes the ammonia to evaporate, creating a cold condi-

tion in the freezer.

When starting this 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.

Sodium chromate is used for corrosion protection (less than

2 weight % of the coolant).

LEVELING THE REFRIGERATOR

Leveling is one of the requirements for proper operation with

absorption refrigerators. To ensure proper leveling the vehicle

needs to be leveled only so it is comfortable to live in (no notice-

able sloping of ﬂoor or walls).

Any time the vehicle is parked for several hours with the refrig-

erator operating, the vehicle should be leveled to prevent this loss

of cooling.

If the refrigerator is operated when it is not level and the vehicle

is not moving, liquid ammonia will accumulate in sections 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.

When the vehicle is moving, the leveling is not critical, as the

rolling and pitching movement of the vehicle will pass to either

side of level, keeping the liquid ammonia from accumulating in

the evaporator tubing.

PURGING AIR FROM THE LINES

If the refrigerator has not been used for a long time - or -

the LP tanks have just been reﬁlled, air may be trapped in the

supply lines. To purge the air from the lines, turn the refrigera-

tor off and on by pressing the ON/OFF button. If the ﬂame is

not lit within 45 seconds, turn the refrigerator off and back on

again. This procedure can be repeated 3 to 4 times. If repeated

attempts fail to start the LP gas operation, check to make sure

that the LP gas supply tanks are not empty and that all manual

shutoff valves in the lines are open.

AUTOMATIC COOLING UNIT CYCLING

SYSTEM AND LOW AMBIENT CONTROL

The refrigerator has been design with an automatic cooling

unit cycling system that helps reduce frost build up in the fresh

food compartment. The ﬁrst automatic frost reduction cooling

unit cycle begins 60 hours after turning “on” the refrigerator

(for best operational results the refrigerator should be turned on

anytime between 4 and 10 PM), and will last for approximately

120 minutes. Thereafter, the cycle will automatically repeat

every 48 hours as long as the refrigerator continues to run.

The automatic Low Ambient Control (LAC) ensures trouble-

free operation in low ambient temperatures (e.g below 50° F).

REFRIGERATOR OVERVIEW

MANUALLY

UNLOCK

Shutter

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Dometic RM1350 User Manual Page 6

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