Solenoid Valve - Dometic RM3604 Service Manual

A battery will provide straight line DC power, but ex-
tended operation will require recharging of the battery
by the converter or the alternator.
The converter and alternator produce DC power by a
series of diodes that rectify alternating current to DC. A
battery or capacitors can be used to clean up the AC
ripple that is present after AC voltage has been rectified.
AC ripple can be measured by a digital voltmeter set on
the AC scale at the main terminal block connections. Six
volts AC or less is acceptable.
NOTE: A brief interruption of the DC power supply while
refrigerator is operating on gas can cause a check light;
for example:
Turning the refrigerator OFF–ON while operating in
the gas mode can cause a check light. The switching
of relays from converter power to battery power when
unplugging from shore power or shutting down of the
generator could interrupt DC power long enough to
cause a check light.
The thermocouple produces 25–35 MVDC when
operating. When DC power is interrupted and re-
stored, the thermocouple may not have sufficient time
to cool. If the power module sees above 6 MVDC,
when power is restored the power module will assume
a problem in the gas mode and immediately turn on
the check light.
The operational range of the unit is a minimum of 9.6V
DC to a maximum of 22V DC. At 22V DC, the unit will
automatically shut down until voltage has decreased to
18V DC for proper operation; however, the panel lights
will continue to illuminate until voltage has dropped to
4V DC or below.
Connecting the refrigerator to an unregulated converter
can result in improper operation of the refrigerator. Do
not use the body or chassis of the RV as a substitute for
either of the two conductors. Proper polarity is crucial
for refrigerator operation. Check for proper DC voltage
at the positive and negative terminals at the back of the
unit. If the voltage is outside the operational range,
correct the power supply problem.
12D. DC COMPONENTS

SOLENOID VALVE

When the refrigerator selects LP gas operation, DC volts
are sent to the solenoid coil which opens the internal
valve.
Check the solenoid coil with a properly calibrated ohm
meter. Remove the connector from the solenoid and
measure the resistance across the terminals. The proper
reading would be 49 ohms with tolerance range of ten
percent.
Next, hook up a manometer at the test port. Then check
for DC volts at gas valve terminals while the unit is in
trial-for-ignition (approximately 45 seconds). If DC volts
are present and pressure is low, replace the valve. If DC
volts are not present at the valve while the unit is in trial-
for-ignition (approximately 45 seconds), verify that the
wire at Plug 3, Terminal 2 on lower circuit board has DC
volts (9 or more). If the valve chatters, check for low
input voltage to the valve (below 9 volts DC).
AMES/AES
REFRIGERATORS
3 6
2 5
1
4
P1
P2
35 A MP
FUSE
J1 J2 J3
3 A MP F USE
®
Dometic MANUAL
Refrigerators
ROYALE AND ELITE
REFRIGERATORS
3
4
P3
FIVE
AMP
FUSE
J4 J5 J6 J7 J8 J10
1 1
2 2
49