Dometic RM 2801 Service Manual download pdf (Page 59)

AES Refrigerator GLOSSARY OF TERMS continued

INDICATOR

LAMP(S)

Consisting of light emitting diode(s) (L.E.D.) the 1st and 2nd generation

series refrigerators will illuminate green when main switch is turned to the “ON” position. If

refrigerator fails to ignite after trial for ignition sequence (2-3 minutes), the green L.E.D. will

shut off and a red L.E.D. will flash on and off, indicating a flame failure. If the incoming battery

voltage to the terminal block drops to approximately 9.5V DC, the indication lamp will shut off

indicating a low voltage situation. The 3rd generation series utilizes three (3) separate green

L.E.D.‘s that are located behind the mode selector pushbuttons. If this series goes into flame

failure, a separate L.E.D. will illuminate orange to indicate this condition.

LEVELING

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

absorption design utilizes no mechanical pumps or compressors to circulate the refrigerant within

the system, so proper leveling must be maintained to provide the correct refrigerant flow. Without

proper leveling, refrigerant within the cooling unit will collect and stagnate at certain areas.

Without proper refrigerant flow, the cooling process will stop. Cooling units that utilize an exposed

siphon pump tube at the generator section (units with square boiler boxes) require a precise

leveling check. To properly level these units a spirit (bubble) level is placed on the floor of the

freezer compartment. To insure operation with the refrigerator when the coach is positioned in

a stationary (standing) manner, the bubble must be at least 3/4 inside the central ring.

Important: Permanent damage can result to the square boiler box units if proper leveling is not

maintained. In recent years

Dometic

has engineered a new type of cooling unit that utilizes an

enclosed pump tube surrounded by a weak ammonia solution to protect the assembly. These units

are evidenced by a circular boiler box cover. To insure proper leveling in these units, the vehicle

needs to be leveled only 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 ammonia from accumulating in the piping.

LP GAS TRIAL FOR IGNITION (Lockout) - Similar to a DSI R.V. furnace, AES refrigerators

incorporate a timed lighting sequence that is controlled by the printed circuit board. When the

controls select LP gas operation, high voltage sparking from igniter and LP gas solenoid are

energized. Normally in just a few seconds spark will ignite air/fuel mixture at the burner and

remain burning until thermostat is satisfied or refrigerator is turned off. If there is air in the gas

line, or the R.V. rig has not been used for a long period of time, this lighting procedure may take

up to 2 to 3 minutes to establish a flame. For this reason the AES refrigerator will attempt to light

the refrigerator for approximately 3 minutes. If after this timed sequence the refrigerator fails to

establish a flame, the igniter and solenoid valve will disengage and no longer attempt to light the

burner. This condition is referred to as lockout. To let the customer know that the refrigerator has

gone into lockout, on the 1st and 2nd generation series models, a red L.E.D. will “flash” on the

control strip on refrigerator exterior. On 3rd generation series models an orange flame failure

indicator will illuminate to identify this condition. Lighting procedure and flame failure indicators

can be reset by making an Off/On procedure.

A-7-3

Manual Compliments of

Northwest RV Supply

Printed From

http://www.nwrvsupply.com

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Dometic RM 2801 Service Manual Page 59

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