Dometic
®
MANUAL
Refrigerators
65
2F. AC VOLTAGE REQUIREMENTS
The refrigerator is a 120 volt AC, 60 Hz appliance. The
proper operating range is 100 to 132 volts. Check the AC
volts at the receptacle where the refrigerator is attached. If
voltage is outside of the proper operating range, correct the
power source problem.
3F. AC COMPONENTS
HEATING ELEMENTHEATING ELEMENT
HEATING ELEMENTHEATING ELEMENT
HEATING ELEMENT
The heating element is designed to
deliver a predetermined amount
of heat to the cooling unit. To
check a heating element, re-
move the heater leads from
the printed circuit board and
measure for proper resistance
across the two leads with a prop-
erly calibrated ohm meter. This check is to
be done with the heating element at room temperature. For
values, refer to the TECHNICAL DATA section.
4F. DC VOLTAGE REQUIREMENTS
For the refrigerator to operate on any mode, DC voltage
must be supplied to the terminals at the rear of the
refrigerator and must be connected directly to the battery
of the RV. The operational range is 10.5 to 15 volts DC.
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 opera-
tion of the refrigerator. Check for proper voltage at the
positive and negative terminals at the back of the refrigera-
tor. If power is outside the operational range, correct the
power supply problem. The power supply to the refrigerator
must be fused. Maximum fuse size: 25 amp for RM3604
and RM3804.
With the refrigerator operating on AC or gas mode, if voltage
to the refrigerator slowly drops to or below 9.5 volts DC, the
gas flame will come and will not be thermostat controlled. Low
DC volts (below 9.5) could cause over-cooling.
3-PRONG PLUG
FOR 120V AC
FUSE LINK
3AMP
MANUAL GAS
SHUTOFF VALVE
IGN.
LOCK
COVER
TERMINAL
BLOCK
5F. DC COMPONENTS
HEATING ELEMENT
The heating element is de-
signed to deliver a predeter-
mined amount of heat to
the cooling unit. Check the
heating element with ohms
resistance using a prop-
erly calibrated ohm meter.
This check is to be done
with the element at room
temperature. The proper ohms for RM3604 and RM3804
DC heating element is .67 with a tolerance range of ten
percent. If the heating element is outside this range,
replace it.
NOTE: It will take a very precise ohm meter to accu-
rately read this measurement. If a precise ohm meter is
not available, a continuity reading will indicate an open
or complete circuit. If an open circuit is the test result,
replace the element.
THERMOSTATTHERMOSTAT
THERMOSTATTHERMOSTAT
THERMOSTAT
The thermostat operates on DC volts and regulates the
inside refrigerator temperature on all modes, by making
and breaking the circuit to the printed circuit board. The
internal mechanism breaks contact (continuity) when ad-
equate cabinet temperature has been reached. Check the
thermostat for continuity. This check should be made at
room temperature with the thermostat turned all the way to
MAX. Another check would be to use a jumper wire with
insulated clips and bypass the thermostat.
NOTE: Use care when doing this test. Do not short to
thermostat casing. Also remove jumper after testing is
completed.
If the above test allows the refrigerator to operate and/or
the continuity test proves the thermostat to be defective,
replace the thermostat. A defective thermostat would
cause insufficient cooling, no cooling and freezing on all
modes.
SOLENOID VALVESOLENOID VALVE
SOLENOID VALVESOLENOID VALVE
SOLENOID VALVE
The solenoid valve assembly is a safety valve as well as a
gas flow valve. When the AES selects LP gas operation, DC
volts are sent to the solenoid coil which opens the internal
valve.
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