Dometic Understanding Gas and Electric Operations for RM2301 and RM2501 Refrigerators

GAS EQUIPMENT

Flue Top and Baffle

The flue baffle is suspended	from the top, and must be
in position in the central tube	of the cooling unit.

The Flame Failure Safety Device

The feeler of the thermo couple shall reach in over two slots of the burner. To replace the thermo couple pro- ceed as follows:

1.Remove the cover.

2.Unscrew plug and pull thermo-couple straight out.

3.Remove spring.

4.Pull out thermo-couple sideways from burner housing.

5.Bend the new thremo-couple to the same shape as the old one.

6.Reassemble in reverse order. Check that feeler has been correctly refitted in relation to burner.

7.Mount plug, taking care not to damage the threa- ded hole in the aluminum cap of the housing. The plug must be properly tightened to the valve hou- sing to ensure good contact between the thermo couple and the magnetic coil within the housing.

The Thermostat

The refrigerator is equipped with a thermostat which is regulated by turning the knob to different settings in order to obtain the desired controlled cabinet tempe- rature.

At OFF Under normal operating conditions the thermostat valve remains closed and the burner is running continuously at the by pass rate, just enough to keep the burner lit.

At M A X The thermostat valve remains open and the burner is running continously at full gas rate. Lowest cabinet and freezer tempera- tures are obtained at this setting.

Between these two extremes of the dial various con- trolled temperatures can be obtained, by turning the thermostat knob to a suitable position. The closer to MAX the lower the temperature. As soon as the requi- red cold temperature inside the cabinet is reached. The thermostat cuts the burner main flame leaving the by-pass flame to keep safety valve open.

The Igniter

The refrigerator is fitted either with a piezo igniter (see fig.1) or an automatic reigniter (fig. 2 and 3) which does not normally need any maintenace. If the igniter does not work properly contact an authorized service point

ELECTRIC EQUIPMENT

Cartridge heater

The refrigerator is equipped also for electric opera- tion. Many models are eqiupped for both 120 Volts A C and 12 Volts D C operation. The heat necessary for the operation of an absorption type cooling unit is supplied by an electric cartridge heater mounted on a pocket of the boiler system. To replace the heater first of course check that the wall plug is disconnected. If the refrigerator is equipped also for 12 Volts D C ope- ration make sure that the 12 V leads are disconnected. Then proceed as follows:

1.	Remove the cover of the main control structure
	by loosening the two screws
2.	Disconnect		the heater leads
3.	Pull off the metal hose
4.	With a	pair	of pliers unfold the lug holdning the lid
	of the	boiler	casing and open the lid

5.Remove some insulation wool so that the heater is accessible

6.Turn and ligt the heater out of its pocket

7.Fit the new heater into the pocket and pull on the hose around the leads

8.Connect the leads and put on the plastic cover

9.Reset the insulation and close the lid of the boiler casing

The Switch

The electronic control also comprises an on-off switch operated by the selector knob at the front panel. The switch has two “on” positions, one for 120 Volts A C (ELEC. ) and one for 12 Volts D C operation.

The Thermostat

The electric thermostat is combined with the gas ther- mostat and is thus operated by the knob B at the front panel. The temperature in the refrigerator can be re- gulated by turning the thermostat knob. Although the exact setting is not critical choose a setting at which the frost which gradually forms on the cooling evapo- rator is just maintained in dry condition. It will be ne- cessary to turn the thermostat knob closer to MAX when the ambient temperature becomes higher or the load unusually heavy. If less cooling is required a lo- wer setting should be chosen.