Dometic RM 2801 Service Manual download pdf (Page 27)

(67)

If at any time while traveling the DC voltage

reaches the approximate 13.3 threshold, the LP

gas flame will shut off and the 12 volt heating

element will energize, continuing normal

operation on the 12 volt mode.

(68)

The voltage to the terminal block is

continuously monitored by the printed circuit

board, while the RV is traveling. Let’s take a

look at a couple of ways this battery protection

system can be beneficial to the customer. First,

suppose a customer has a weak or underrated

alternator installed in the RV that is equipped

with an RM3801. As the vehicle’s ignition is

turned on,

the ignition lock terminal is

energized by 12 volts, but because of the weak

alternator, the printed circuit board can never

see the 13.3 volts at the terminal block that is

needed to energize the 12 volt heating element.

So, the refrigerator will light and stay on the

gas mode while the RV is traveling.

(69)

After a few hours of driving, the customer

pulls into a gasoline station to refuel the

vehicle. Even though the system is operating

on the gas mode, as soon as the ignition key is

turned off, the LP gas flame shuts off and the

system initiates an approximate 25 minute time

delay mode. This allows the customer to stop

and refuel the coach without turning the unit

off. As long as the ignition lock terminal is

energized with 12 volts by the ignition switch,

the system will always go into a safety delay

when the ignition key is turned off. This will

prevent an open flame at the burner when

refueling.

TAG LINE ENERGIZED

VOLTAGE

-+

13.3 V.D.C.

(FOR 40 SEC. MIN.)

12V ELEMENT

ENERGIZES

TAG LINE ENERGIZED

VOLTAGE 13.3 V.D.C.

(FOR 40 SEC. MIN.)

12V ELEMENT

ENERGIZES

LOWER THAN 13.3 V.D.C.

q

L.P. GAS

OPERATION

,,’

VOLTAGE

+

s”i”C:C~,N.)

12V ELEMENT

ENERGIZES

LOWER THAN 13.3 V.D.C. =

L.P. GAS

OPERATION

::..::.::.::

..:.,.:::,.::..

IGNITION KEY

TURNED DFF

=

25 MIN.

SAFETY DELAY

A-6-20

27

Manual Compliments of

Northwest RV Supply

Printed From

http://www.nwrvsupply.com

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