Ac Voltage; Ac Voltage Requirements; Ac Components; Heating Element - Dometic RM1350 Diagnostic Service Manual

SectIon 2 ac Voltage

ac Voltage reQuIrementS

this is an energized circuit. Shock can occur
if not tested properly. testing is to be done
by a qualified service technician.
The refrigerator is a 120 volt AC, 60 Hz appliance. The
proper operating range is 100 to 132 volts. If voltage
drops below 100 volts, cooling efficiency will decrease
relative to voltage decrease. 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.
120 Volt
receptacles
The refrigerator is equipped with a three-prong (ground-
ing) plug for your protection against shock hazards and
should be plugged directly into a properly grounded three
prong receptacle. do not cut or remove the ground-
ing prong from this plug! The free length of the cord
is 3 feet. It is recommended that the receptacle is locat-
ed to the right side of the refrigerator (viewed from the
rear). The receptacle should be 3" (from the bottom of the
plastic receptacle) above the refrigerator mounting floor.
This allows easy access through the vent door. The cord
should be routed to avoid direct contact with components
that could damage the cord insulation. The refrigerator
will not switch to another mode of operation until all AC
power is lost.
SectIon 3 ac comPonentS
3.1Heating elements
The heating element is designed to deliver a predeter-
mined amount of heat to the cooling unit. To check a heat-
ing element, remove the heater leads from the printed
circuit board and measure for proper resistance across
the two leads with a properly calibrated ohm meter. This
check is to be done with the heating element at room tem-
perature. You should obtain the following readings ± 10%:
May have seper-
ate power cords if
unit has Ice Maker
Model Watts
RM1350
The RM1350 uses two AC heaters wired in series. The
ohms resistance should be 34.3 ohms +/- 10%.
note: never over or under size the ac heater.

3.2 ac Icemaker Water Valve

This valve is solenoid operated. When it is open it
releases water from the source to the mold. The amount
of water is proportional to the length of time the water
valve switch is held closed by the timing cam. Disconnect
power to the appliance, remove the wires to the water
valve solenoid coil, and check for continuity between the
two terminals. The ohms reading should be 200 +/- 10%.
If you have continuity, the solenoid is good. It takes 10-
15 watts to energize the solenoid coil. The mold heater
and coil are in series. When the mold heater is activated,
this causes the voltage to drop to about 105 VAC at the
coil. The valve has a flow washer inside which acts as a
pressure regulator. A strainer is installed to prevent dirt,
rust, etc from entering the valve. Check for any debris
which might obstruct the flow of water or prevent the valve
from closing completely when the circuit is not energized.
Remove any obstructions. If the valve still fails to operate
properly, replace it. If the valve has been cracked from
freezing this would not be a warrantable item.
12 Volt Valve
Water in Door
120 Volt Valve
Icemaker
16
Ohms
420 34.3
Amps
3.5