Dometic RM 2801 Service Manual download pdf (Page 58)

AES Refrieerator GLOSSARY OF TERMS continued

ELECTRODE

The angular piece of metal located just above the burner that is connected to the

high voltage cable. High voltage “jumps” the air gap between electrode and burner, and creates

the sparking seen at the burner. This circuit is grounded by the gas flame which stops the sparking

produced by the igniter. For igniter/high voltage cable/electrode assemblies to operate correctly,

the electrode must be positioned properly. The air gap distance between electrode and burner

should measure approximately

3 / 1 6 "

GAS PREVENTION SAFETY DEVICE - The AES has a safety circuit that will prevent sparking

and gas ignition on the gas mode if one of the following conditions occur:

A. Printed circuit board failure

B. Igniter failure

C. No voltage is present at positive and negative

connections at the terminal block

This safety circuit is designed to insure that LP gas will not accumulate at the burner due to a part

failure.

HEAT INPUT

One (1) of three (3) requirements for proper operation with absorption refrigerators.

This specification is critical to maintain proper cooling properties of the cooling unit. With too

little heat at heating element or burner, the ammonia in the cooling unit will not vaporize (boil

off) properly and a lack of cooling will result. An excessive amount of heat to the cooling unit will

cause the water, as well as ammonia, to vaporize, causing the cooling process to stop. Since as little

as 25 BTU’s input can dramatically affect operation of the cooling unit, it is NOT recommended

to substitute heating element sizes or burner orifice values. Whenever diagnosing heat input

problems, refer to Service Bulletin No. 28 or the AES Technical Data Sheet on page A-6-28.

HEATING ELEMENTS - Self-contained heat generating devices operating off either AC or DC

voltage that supplies heat to generator section of the cooling unit.

HIGH VOLTAGE ELECTRODE CABLE

Cable that transmits high voltage, produced by the

igniter, and sends it to the electrode. High voltage from the igniter results in sparking at the

burner assembly which lights the air/gas mixture at the burner. This cable should always be

disconnected when diagnosing the igniter. If the cable is shorted to ground the result will be no

spark on LP gas operation.

A-7-2

Manual Compliments of

Northwest RV Supply

Printed From

http://www.nwrvsupply.com

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Dometic RM 2801 Service Manual Page 58