Dometic RM2510, RM2552, RM2610, RM2453, RM2452 SERVICE TIPS

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SERVICE TIPS

Efl Dometic@

MANUAL

REFRIGERATORS

Models

RM2310 RM2410 RM2452 RM2453 RM2552 RM2553

RM2510 RM2610 RM2810

Dometic

Corporation

OS1717

4/96

THE MOST COMMON SYSTEM PROBLEMS ASSOCIATED WITH THE

RM2310,

RM2410,

RM2510, RM2610 , RM2810, RM2452, RM2453, RM2552

AND RM2553 REFRIGERATORS

SYMPTOM

No operation.

2. No electric operation.

No gas operation - no spark.

4. No gas operation

sparks but no flame.

CAUSE

Operation Wiring Switch

Operation AC Volts

Heating Element

Thermostat

Switch Wiring

Operation

DC Volts Igniter Electrode High Voltage Cable Switch Wiring

Operation LP gas Filter Orifice

Burner Shut-off Valve Safety Valve

Thermocouple

Thermocouple Adapter,

(Top Mount Controls Only)

No cooling on any mode.

6. No cooling on gas mode(s).

7. No cooling on electric mode(s).

cools properly on other

Operation Level Ambient Temperature Cooling Unit

LP Gas

Thermostat

Filter

Orifice

Burner Flue Baffle Flue Tube

AC Volts

Heating Element

Thermostat

Switch Wiring

SYMPTOM

CAUSE

Insufficient cooling on all modes.

Insufficient cooling on electric - cools properly on other mode(s).

Insufficient cooling on gas.

10. Cools properly on other mode(s).

Freezes on electric - cools properly on

11. other mode(s).

Freezes on gas - cools properly on other

12. mode(s).

Operation

Level Ventilation Ambient Temperature Air Leaks

Thermostat

Cooling Unit

AC Volts

Heating Elements

Thermostat

LP Gas Pressure Thermostat

Filter Orifice Burner

Flue Baffle Flue Tube

Thermostat

Wiring

Bypass Screw

Thermostat

Won’t stay lit on gas.

13.

Rapid formation of frost.

14.

No DC operation - cools properly on AC

15. and gas.

Insufficient cooling on DC- cools properly

16.

on AC and gas.

RM251

17.

0/RM261 0/RM2810

On gas mode, sparks while flame is lit.

LP Gas Safety Valve Thermocouple Thermocouple Adapter,

(Top Mount Controls Only) Flame Failure Meter

(Top Mount Controls Only) Flue Baffle Flue Cap (Bottom Mount

Controls Only)

Orifice

Burner Food Storage

Air Leaks

Interior Liner Seal to Frame

High Humidity

DC Volts Heating Element Switch Wiring

Relay (RM261 DC

Volts Heating Element Relay (RM261

Electrode LP Gas Bypass Screw Filter

O/RM2810)

0/RM2810)

REFRIGERATORS WITH

BOTTOM

MOUNT CONTROLS

Refrigerators with Piezo lgnitors (RM2310

A B - Thermostat Gas/Electric c - Safety Push-button D -

Piezo lgnitor

RM2410)

ON/OFF Switch

Flame View Port

Refrigerators with Automatic Reigniters (RM251

A - ON/OFF Switch B - Thermostat, Gas/Electric c E - Light

O/RM261 O/RM2610)

Safety Push-button

GAS OPERATION

Refrigerators with

To start the

Turn the thermostat knob

Push button

piezo ignitor several times to light the burner. This can be observed through the flame view port, on the refrigerator.

After the flame lights, continue to hold button “C” for an additional fifteen (15) seconds. Release the

button “C” and check the flame view port goes out, repeat the lighting procedure.

To shut off the refrigerator, turn Knob “A” to the “OFF” position.

Refrigerators with Automatic Reigniters (RM2510

To start the refrigerator, turn knob “A” to the “GAS” position. Turn the thermostat knob

Piezo lgnitor (RM2310 & RM2410)

refrigerator, turn knob

“B”

“C”

in until it bottoms out-and hold. While holding button “C”, push button “D” for the

“6”

“A”

to the “GAS”

one-quarter

“E”

one-quarter

position.

(l/4)

of a turn from the “OFF” position.

to make sure the burner does not go out. If the burner

/RM2610

(l/4)

of a turn from the “OFF” position.

/RM2810)

“E”,

Push button “C” in until it bottoms out-and hold. When lamp an additional 15 seconds. Release button “C”. If the lamp

“E”

stops flashing, hold push-button “C”

“E”

starts to flash again, repeat lighting

procedure. If flame blows out, the reigniter will automatically relight the flame.

NOTE:After changing an LP tank, or after a long shut off period, the gas line is likely to be filled with air. You may have to repeat the lighting procedure several times to purge the air out of the gas lines.

ELECTRIC OPERATION

Check to be sure the power cord is properly connected to the power supply. If the refrigerator is equipped for 12 volt DC operation, the tow vehicle engine should be running to prevent discharging the battery.

Turn knob “A” to the position marked operation.

“B”

Turn the thermostat knob

To shut off the refrigerator, turn knob “A” to the

one-quarter

“ELEC”

(l/4)

for 120 volt AC operation or

of a turn from the “OFF” position.

“OFF”

position.

“12V”

for 12 volt DC

THERMOSTAT

The refrigerator is equipped with a thermostat that can be adjusted by turning knob

setting to maintain the desired cabinet temperature.

“OFF” Setting of the Thermostat:

burner runs continuously at the bypass rate or pilot. In electrical operation, the contacts in the thermostat are open and the heating elements are off.

“MAX” Setting of the Thermostat:

high flame continuously. In electric operation, the heating element is “ON” continuously.

The thermostat can be adjusted between “MAX” and “OFF” to obtain the desired cabinet temperature. The closer the knob is to “MAX”, the colder the cabinet temperature. The closer the knob is to

“OFF”, the warmer the cabinet temperature.

In gas operation, the thermostat closes its main valve and the

In gas operation, the thermostat allows the burner to remain on

“B”

to a different

When the thermostat reaches the set temperature, it will cut the burner back to bypass or, in electric operation, shut off the heating element.

OPERATION

REFRIGERATORS WITH TOP MOUNT CONTROLS

REFRIGERATORS WITH PIEZO IGNITORS: RM2452 AND RM2453

LEGEND: A Energy Selector Knob

B Thermostat Knob

C Flame Failure Safety

Valve Push Button D Piezo lgnitor E Flame Indicator

---_-__-----m-------------v-

REFRIGERATORS WITH AUTOMATIC IGNITION: RM2552 AND RM2553

GAS OPERATION

REFRIGERATORS WITH (RM2452 & RM2453)

To start the refrigerator, turn knob “A” to the “GAS” position. Turn the thermostat knob

Push button “C”, push button

on the flame indicator

After the flame lights, continue to hold button check the flame indicator procedure. To shut off the refrigerator, turn knob “A” to the “OFF” position.

PIEZO IGNITOR

“B”

one-quarter

“D”

for the piezo ignitor several times to light the burner. This can be observed

“E”,

on the refrigerator.

“E”

to make sure the burner does not go out. If the burner goes out, repeat the lighting

(1/4)

of a turn from the “OFF” position.

“C”

for an additional ten (10) seconds. Release the button

“C”

and

REFRIGERATORS WITH AUTOMATIC (RM2552 AND RM2553)

1. To start the refrigerator, turn knob “A” to the “GAS” position.

2. Turn the thermostat knob

Push button button repeat lighting procedure. Should flame blow out, the reigniter will automatically relight the flame.

NOTE: After changing an LP tank, or after a long shut-off period, the gas line is likely to be filled with air. You may have to repeat the lighting procedure several times to purge the air out of the gas lines.

“C”

in until it bottoms out - and hold. When flame indicator

“C”

an additional 15 seconds. Release button “C”. If the flame indicator

“B”

REIGNITERS

one-quarter

(l/4)

of a turn from the “OFF” position.

“E”

shows the flame is on, hold push

“E”

starts to move toward off,

ELECTRIC OPERATION

Check to be sure the power cord is properly connected to the power supply. volt DC operation, the tow vehicle or caravan engine should be running to prevent discharging the battery.

“ELEC”

Turn knob “A” to the position marked Turn the thermostat knob To shut off the refrigerator, turn knob “A” to the “OFF” position.

“9”

one-quarter

for 120 volt AC operation or

(l/4)

of a turn from the “OFF” position.

If the refrigerator is equipped for 12

“12V”

for 12 volt DC operation.

THERMOSTAT

The refrigerator is equipped with a thermostat that can be adjusted by turning knob the desired cabinet temperature.

Setting of the Thermostat:

“OFF” continuously at the bypass rate or pilot. In electrical operation, the contacts in the thermostat are open and the heating elements are off. “MAX” Setting of the Thermostat: In gas operation, the thermostat allows the burner to remain on high flame continuously. In electric operation, the heating element is “ON” continuously. The thermostat can be adjusted between “MAX” and “OFF” to obtain the desired cabinet temperature. The closer the knob is to “MAX”, the colder the cabinet temperature. The closer the knob is to “OFF”, the warmer the cabinet temperature.

In gas operation, the thermostat closes its main valve and the burner runs

“9”

to a different setting to maintain

When the thermostat reaches the set temperature, it will cut the burner back to bypass or, in electric operation, shut off the heating element.

The setting of the thermostat is not critical, but we recommend it be adjusted to maintain a dry frost on the cooling fins. Adjust the thermostat knob closer to “MAX” when the outside temperature becomes warm.

AC VOLTAGEREQUIREMENTS

The proper operating range is 100 to 132 volts. Check the AC volts at the receptacle where the refrigerator is attached.

If voltage drops below 100 volts, cooling efficiency will decrease with voltage decrease.

AC COMPONENTS

HEATING ELEMENT

To check a heating element, remove the heater leads from the terminal block and measure for proper resistance across the two leads.

You should obtain the following readings, plus or minus 10%:

RM2310 92 RM2410 92 RM2510 RM2610 48 RM2810 44

RM2452 69 RM2453 69 RM2552 69 RM2553 69

DC VOLTAGE REQUIREMENTS

The operational range is 10.5 to 15 volts DC. Check for proper voltage at the terminal block or blocks at the back of the refrigerator. The power supply to the refrigerator must be fused.

DC COMPONENTS

SWITCH (BOTTOM MOUNT CONTROLS)

A. Remove all wires from the assembly.

For the DC mode, For the AC mode, you

continuity should exist between terminals 1 and 1A and 2 and2A.

should have continuity between 4L and 4A and 5N and 5A.

RM2310 & RM2410 SWITCH ASSEMBLY

DC Mode

AC Mode

(3-Way

Models Only)

DC Mode

-Mode

The RM251

O/RM261 O/RM2810

all wires from the assembly.

selector switch should be checked for continuity in the following manner. Remove

For the DC mode, continuity should exist between terminals

and IA and2 and 2A. For the gas mode, you should

have continuity between 3 and 3A.

For the AC mode, you should have continuity between 4L and 4A and 5N and 5A.

RM251

O/RM261 O/RM2810

SWITCH ASSEMBLY

Gas Mode

DC Mode

Mode

AC Mode

Gas Mode

SWITCH (TOP MOUNT CONTROLS)

Remove all wires from the assembly. For the DC Mode

(3-Way

Models ONLY), continuity should exist between terminals 5 and 5a and 6 and 6a. For the AC Mode, continuity should exist between terminals 1 and la and 2 and 2a. For the Gas Mode (on refrigerators equipped with automatic

REIGNITERS

ONLY), continuity should exist between

terminals 4 and 4a.

RM2452/RM2453/RM2552/RM2553 SWITCH

Gas Mode

Mode 1

Gas Mode

‘DC

Mode

IGNITER

A. MODEL

When the button is pushed, a spring loaded striker creates a spark. If there is no resistance when pressing the button, the piezo igniter is defective.

RM2310,2410,2452,2453

B. MODEL

RM2510,2610,2810,2552,2553

Check that the switch is in the gas mode and is completing the circuit. Next, verify proper voltage at the positive (+) and ground (-) terminals of the igniter. The reading should be within one volt of incoming voltage at the terminal block.

HIGH VOLTAGE

Disconnect DC power at the terminal block. Remove high voltage cable from igniter. Reconnect DC power, the igniter should produce a sparking sound.

ON MODEL

RM2510,2610

AND 2810:

With the igniter producing spark, set the meter on 20 volts DC or lower scale,

connect meter leads to L and ground terminals on the igniter. The meter should read a pulsating voltage. The pulsating voltage allows a lamp to illuminate on the front of the refrigerator to advise the customer spark has been

produced.

ELECTRODE

Do a visual inspection for cracks or breaks on the ceramic insulator. Also, verify the mounting bracket is attached properly to the electrode. Check the spark gap. It must be set at three sixteenths electrode above the slots in the burner.

ELECTRODE

TlP

(3/16)

of an inch and the tip of

HIGH VOLTAGE CABLE

Be sure switch and igniter are good before checking the high voltage cable and the switch is in the gas mode. Disconnect DC power at the terminal block. Disconnect high voltage cable from electrode. Reconnect DC power to the terminal block. If sparking starts, cable is good. If no sparking, disconnect DC power at the terminal block and then disconnect high voltage cable at the igniter. Reconnect DC power to the terminal block.

RELAY (RM261 0/RM2810 3-WAY

MODELS ONLY)

Verify the selector switch is on DC mode and the thermostat is circuit. Verify voltage is present between terminals 85 and 30.

Check for voltage between terminals 85 and 87. If voltage is present, the relay is defective.

NOT

completing the

Verify the selector switch is on DC mode and the thermostat is completing the circuit. Verify voltage is present between terminals 85 and 86. If voltage is present, between 85 and 86 terminals, then voltage should be present between

terminals 85 and 87.

HEATING ELEMENT

(3-WAY

Check the heating element with ohms resistance using a properly calibrated ohm meter. You should obtain the following readings, plus or minus 10%:

A continuity reading will indicate an open or complete circuit.

MODELS ONLY)

RM2310 RM2410 RM2510 RM2610 RM2810

RM2453

RM2553

1.15 OHMS

1.15 OHMS .82

OHMS

.67

OHMS

.67

OHMS

.83

OHMS

.83

OHMS

FLAME INDICATOR METER

If the

millivolts

from the thermocouple are 5 millivolts or more, the red needle in the meter

should

be in the green section.

LP GAS REQUIREMENTS

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 turned 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

located just prior to the orifice.

*‘-

PRESSURE TEST HOUSING

LP GAS COMPONENTS

SHUT-OFF VALVE

To check the shut-off valve, remove and inspect for any obstructions.

REFRIGERATORS WITH TOP MOUNT CONTROLS

MANUAL GAS VALVE

REFRIGERATORS WITH BOTTOM CONTROLS

MOUNT

MANUAL GAS VALVE

MANUAL GAS SHUTOFF VALVE

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. 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 maximum and check the gas pressure at the pressure test port. It should be line pressure, between 11 to 12 inches 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

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.

To check the calibration of the thermostat,

To check the thermostat for

proper gas

place a container of water in the

flow,

set the thermostat

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.

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TYPICAL

2-WAY

WITH PIEZO IGNITER

FOR REFRIGERATORS WITH BOTTOM MOUNT CONTROLS

123 VOLTS AC

I20

VOLTS AC

TYPICAL

3-WAY

WITH PIEZO IGNITER

FOR REFRIGERATORS WITH BOTTOM MOUNT CONTROLS

12 VOLTS DC

r--Y

VOLTS DC

-------$

120 VOLTS AC

THERMOSTAT

JUNCTION BLOCK

TYPICAL

FOR REFRIGERATORS WITH

2-WAY

VOLTS DC

WITH

BOTTOM

REIGNITER

MOUNT CONTROLS

120

VOLTS AC

VOLTS

TYPICAL

FOR REFRIGERATORS WITH

3-WAY

WITH

REIGNITER

BOlTOM

MOUNT CONTROLS

AND RELAY

12 Volts DC

‘7

120 Volts AC

I-?

cd/

120 VOLTS AC

TYPICAL

FOR REFRIGERATORS WITH BOTTOM MOUNT CONTROLS

,*---,

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3-WAY

-fiBLACK

0”

GREEN

GREEN/YELLOW

WITH REIGNITER

VOLTS

12 VOLTS

c-q

-o___P @

DC +

+I2 VOLT:

120

VOLTS AC

l-9

VOLTS DC

TYPICAL

FOR REFRIGERATORS WITH TOP MOUNT CONTROLS

2-WAY

WITH

PIEZ0

IGNITOR

GROUND

@----HEATER 120~

C-TERMINAL BLOCK

120 VOLTS AC

@-SWITCH @-THERMOSTAT

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3--RED

4-YELLOW/GREEN

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@-BL.UE

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TYPICAL

3-WAY

WITH

PIEZO IGNITOR

FOR REFRIGERATORS WITH TOP MOUNT CONTROLS

120

VOLTS AC

12 VOLTS DC

12V

@-HEATER 12v

@HEATER 120V

C-SWITCH

@-TERMINAL

(&THERMOSTAT

GROUND

BLOCK

TYPICAL

3-WAY

WITH

REIGNITOR

FOR REFRIGERATORS WITH TOP MOUNT CONTROLS

*HEATER 12V

12 VOLTS

120 VOLTS AC

12 VOLTS DC

;ROUNO

OTHER

LEVELING

Refrigerators have a type of cooling unit that utilizes an enclosed pump tube surrounded by a solution to protect the assembly. To ensure proper leveling with these models, the vehicle needs to be leveled so it is comfortable to live in. (No noticeable sloping of floor or walls). When the vehicle is moving, leveling is not critical as the rolling and pitching movement of the vehicle will pass to either side of level, keeping the refrigerant from accumulating in the piping.

VENTILATION

In a proper installation there should be zero (0”) clearance surrounding the sides and top of the refrigerator to achieve proper air flow.

In addition, the cooling unit should have the following clearances to the nearest surface made of combustible material:

RM2310 1 RM2410 RM2510 RM2610 RM2810

1/2 1/2 1/2

1/2 RM2452 0 RM2453

0 RM2552 0 RM2553 0

INCH

INCH INCH

INCH INCH INCH INCH INCH

RM231

O/RM2410

RM2510/ RM2610

/RM2810

RM2452/RM2453/RM2552RM2553

TURNING VANE

PATH OF AIR FLOW

CLEARANCE FR COMBUSTIBLE MATERIALS

FROM SIDE OF

CLEARANCE

ROM

SIDE OF

AIR LEAKS

Check the gasket on the doors to be sure of a positive air seal. Check that the cooling unit is installed properly.

DOOR POSITION

To correct an alignment of the door, loosen the hinge screws slightly, and reorient the door in the proper position.

If the door needs more adjustment than is available through the hinge adjustment, the base can be repositioned to reorient the door.

AMBIENT TEMPERATURE

As the ambient temperature increases, the air temperature in the area of the cooling unit increases.

COOLING UNIT

To check the cooling unit, first verify the AC heating element is good. Then place approximately one gallon of water

inside the refrigerator and place a thermometer in one of the containers of water. Supply 115 volts direct to the AC heating element and operate for at least 12 hours. Check the temperature on the thermometer. It should be at 45 degrees or lower depending on test conditions.

FOOD STORAGE

Rearrange your foodstuffs. It is essential that the shelves are not covered with paper or large storage containers. Always remember to allow for proper air circulation. Odorous or highly flavored foods should always be stored in covered dishes, plastic bags or wrapped in foil or waxed paper to prevent food odors. Vegetables, lettuce, etc., should be covered. NEVER PUT HOT FOOD INTO THE REFRIGERATOR.

HIGH HUMIDITY

High humidity may cause a small amount of condensation to form on the frame of the refrigerator. As the humidity is reduced, the sweating will decrease.

INTERIOR LINER SEAL TO FRAME

There is a seal that is applied to the liner in the area where the metal frame makes contact with the interior liner. Cold air can migrate out to the metal frame.

Clean the metal frame and foil-backed insulation around the refrigerator.

between outer frame and foil-backed refrigerator insulation. Make sure the refrigerator is dry and that the surface

temperatures are above 50°F. Use a clear silicon caulking compound and seal the seam between the refrigerator’s

plastic liner and the metal frame. NOTE:

TO FORM A PROPER SEAL, IT IS IMPORTANT NOT TO LEAVE ANY

GAPS.

Apply

a foil-backed adhesive tape to the joint

DOUBLE DOOR REFRIGERATOR SHOWN WITH DOORS REMOVED

Dometic RM2510, RM2552, RM2610, RM2453, RM2452 SERVICE TIPS

Specifications and Main Features

Frequently Asked Questions

User Manual