Dometic RM 2801 Service Manual download pdf (Page 71)

Bulletin #46 continued

The thermostat used in the AES system is a normal

electric thermostat without an off position.

It operates

on low voltage from the printed circuit board.

If the

thermostat

is broken and has lost its charge, the

refrigerator will not operate on gas, 120 or on 12 volt.

If it is believed that the thermostat is broken, by-pass

the thermostat by removing the two wires connected to

it. Then place the two leads from the thermostat

together and try for operation.

The thermostat should be

replaced if the refrigerator now functions properly when

the leads are connected.

Overfreezing will occur in the refrigerator if the thermostat capillary tube is not far

enough into its holder.

For the Model 1303 AES, the capillary tube distance should be

35” to 36” from the tip of the sensing tube to the bottom of its holder; and on the

Model 763 AES, it should be 31” to 32”.

For the new style thermostat, Part

No. /9 AES, the capillary tube

attaches

to the evaporator on models 3800,

3600, 3500 and 663 ONLY.

IGNITER

HIGHVOLTAGE

GAS IGNITER

The igniter operates with 12 volt current.

On gas

operation the igniter senses the resistance through

the flame between the electrode and burner.

When

there is no flame at the burner, the resistance is

high and the igniter begins sparking to light the

burner. As soon as the flame is lit, the resistance

between the electrode and burner drops and the

igniter stops sparking. The resistance is monitored by

the igniter and if for any reason the flame goes out,

the igniter begins sparking until the burner is lit.

This insures that the flame will always be lit when

desired.

If the electrode does not spark, first make sure the igniter is receiving 12 volts. If the

igniter is receiving 12 volts and produces no spark, it must be checked for operation.

Remove the wire between the electrode and igniter and place 12 volts at the 12 volt +

lug.

If no internal clicking sound is heard, the igniter is broken. It is important to

remove the high voltage wire that goes to the electrode from the igniter when you are

checking the igniter for operation.

The high voltage wire and the electrode can be

connected to ground causing the circuit board to think that the flame is lit, resulting in

no spark on gas operation.

Moisture or dirt on the electrode itself will also affect the

igniter.

When diagnosing an igniter problem double check it to make sure the igniter is

dry, clean and has proper gap (see FIG. 7).

INDICATION LAMPS

The indication lamp consists of two light emitting diodes; one green and one red. When

the 12 volt supply to the refrigerator is adequate to operate the system, the green light

shows.

If the system runs out of propane fuel,

the indicator light flashes red to warn

you that the gas supply is depleted.

If the battery voltage drops below 9.5

1) volts,

the green indicator light will shut off to warn you of the low battery condition.

At this

time, the flame will be continuously lit until the battery returns to 12 volts.

It also

must be remembered that all electrical connections in the AES are polarized, including

the indicator lights.

This light will show constant red and flashing green if it is

inserted upside down on the 1303. 763 and 663.

A-9-3

Manual Compliments of

Northwest RV Supply

Printed From

http://www.nwrvsupply.com

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