Dometic RM3604 Diagnostic Service Manual Download Page 12

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DIAGNOSTIC SERVICE MANUAL

Dometic

RM3604/3804 AES

Refrigerators

SECTION 5

LP GAS REQ

LP GAS REQUIREMENTS

UIREMENTS

The LP gas pressure to the refrigerator should be 11
inches water column with half of all BTU's of the RV
turned on. With all other appliances off, the pressure to the
refrigerator should
not exceed 12
inches water
column. To check
the gas pressure
when the refrigerator
is operating, there is
a pressure test
housing on the solenoid.

SECTION 6

LP GAS COMPONENTS OR

LP GAS COMPONENTS OR
MANU

MANU

MANUAL GAS SHUT

AL GAS SHUT

AL GAS SHUTOFF

OFF

OFF V

VAL

ALVE

6.1

MANUAL GAS SHUTOFF VALVE

The manual gas shutoff valve is where the incoming LP
gas supply is attached. To check the shutoff valve,
remove and inspect for any obstructions. The valve must

be turned to "ON" before any gas operation can occur.

6.2

ORIFICE

The orifice is a small brass fitting that has a ruby mem-
brane that is laser beam drilled and is mounted on the gas
line just prior to the burner. The orifice is cleaned by using
an alcohol based solvent and allowing to air dry.

IMPOR

IMPORT

TANT

ANT

NEVER USE A DRILL BIT OR JET TIP CLEANER TO
CLEAN ANY ORIFICE AS THESE DEVICES WILL
DAMAGE THE FACTORY MACHINED PART AND
CREATE A POTENTIALLY DANGEROUS CONDITION.

6.3

THERMOCOUPLE

The thermocouple is a component extending above the
burner assembly so the tip is in the path of the flame. It will
produce 14 to 30 millivolts DC in normal operation. To
check the thermocouple, use a known good safety valve
and attach to the thermocouple. Next, supply flame to tip
of the thermocouple for a few moments while depressing
the safety valve. Remove the flame and release the safety

valve.

The valve should hold for at least 30 seconds. If it does
not hold the safety valve open for 30 seconds, replace
the thermocouple. If it does hold for 30 seconds or more,
the thermocouple is good — do not replace it.

NOTE

NOTE: Be sure the tip on the thermocouple is clean.

6.4

BURNER

The burner is a slotted metal tube located below the flue
tube on the cooling unit. It should be level, and the slots
in the burner should be directly below the flue tube. The
burner should be cleaned periodically, at least once a
year. To clean the burner, remove from the refrigerator
and check for any foreign residue that could cause a
deflection of the gas flow or the flame. Next, soak the

burner in an alcohol based solvent and allow to air dry.
After cleaning, reinstall in the refrigerator.

6.5

FLUE BAFFLE

The flue baffle is designed to concentrate the heat (from
the gas flame) at a certain area of the flue tube. It should
be cleaned periodically, at least once a year. To clean,
remove from the flue tube and check for any damage,
then clean thoroughly. The length of the flue baffle
assembly (flue baffle and wire) for the RM3604 is 31-9/
16 inches, and for the RM3804 is 37-1/8". The flue baffle
itself for the RM3604 is 3/4 inch wide and 5-1/4 inches
long; for the RM3804, it's 3/4 inch wide and 6 inches
long. The proper baffle position for the RM3604 is 1-5/8
inches from the burner to the bottom of the baffle; for the
RM3804 the proper baffle position is 1-3/4 inches from
the burner to the bottom of the baffle.

6.6

FLUE CAP

The flue cap is located at the top of the flue tube and is
attached with a screw. It must be properly attached or
flame outage could occur.

6.7

FLUE TUBE

The flue tube is a component of the cooling
unit. It must be cleaned periodically, at
least once a year. To clean, remove flue
cap and flue baffle, then cover the burner
and clean by using a flue brush. Dometic
Part Number 0151404001. If the flue tube
becomes coated with scale or residue from
combustion of LP gas, the efficiency of gas
operation decreases.

NOTE

NOTE: After cleaning be sure to reinstall
the flue baffle and flue cap.

PRESSURE TEST
HOUSING

SOLENOID

Manual Gas
Shutoff Valve

3-Prong Plug
for 120V AC

IGN
LOCK

Fuse Link
3 Amp

Terminal
Block

Cover

BURNER