Filter; Bypass Screw; Safety Valve; Thermocouple - Dometic RM2310 Service Tips Manual

FILTER

A filter is located in the inlet fitting to the thermostat. The filter can become saturated and cause a restriction to gas
flow. If you suspect a restriction, first verify the thermostat and bypass screw are good.
THERMOSTAT
LP GAS MODE
The thermostat is calibrated by the manufacturer so that at mid-range the cabinet temperature should be
approximately 40 degrees Fahrenheit. To check the calibration of the thermostat, place a container of water in the
cabinet of the refrigerator and operate at mid-range setting until the thermostat is satisfied. Check the temperature
of the water. It should be approximately40 degrees. To check the thermostat for proper g a s flow, set the thermostat
to maximum and check the gas pressure at the pressure test port. It should be line pressure, between
water column. If you have less than 11 inches of water column pressure, the next step would be to shut off the gas
supply and remove the bypass screw. Then install a bypass screw that does not have the small o-ring on it. Next, turn
on the gas supply and take a reading. If the manometer now reads 11 inches of water column, the thermostat is
defective and must be replaced. If the bypass screw test shows no change in pressure, the problem lies in the filter,
the shut-off valve or the gas supply.
ELECTRIC MODE
On 2-way models it controls the AC heating element. On 3-way models it controls the DC heating element as well as
the AC heating element. Check the thermostat for continuity.

BYPASS SCREW

There are three common sizes of this screw: S-17 (350 BTU), S-14 (325 BTU) and S-l 1 (300 BTU). To check the
bypass screw, connect a manometer at the pressure test housing. The pressure on low flame mode should be 2 to
4 inches water column.

SAFETY VALVE

To check the safety valve, use a known good thermocouple and install into the safety valve. Supply flame to the tip
of the thermocouple for 2 to 3 minutes while holding in on the safety valve stem. Remove flame from thermocouple
tip and release safety valve stem. The safety valve should hold in for at least 30 seconds.

THERMOCOUPLE

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 the tip of the thermocouple for 2 to 3 minutes 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.
THERMOCOUPLE ADAPTER
The thermocouple adapter is a device that allows the flame indicator meter to read DC millivolts from the thermocouple.
Remove it from its location and do a continuity test from the terminal to the center post. Continuity should exist. Next,
check for continuity between the terminal and casing. No continuity should exist.
BURNER
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.
FLUE BAFFLE
It should be cleaned periodically, at least once a year.
FLUE CAP - BOTTOM MOUNT CONTROLS
It must be properly attached or flame outage could occur.
13
to 12 inches
11