Ac Voltage Requirements; Ac Components; Heating Element (Rm2201 ); Dc Voltage Requirements - Dometic RM2150 Series Service Manual

SECTION 2

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 drops below 100 volts, cooling
efficiency will decrease with voltage decrease. If voltage
is outside of the proper operating range, correct the
power source problem.
SECTION 3

AC COMPONENTS

HEATING ELEMENT

The heating element is designed to
deliver a predetermined amount of
heat to the cooling unit. To check a
heating element, remove the
heater leads from the terminal
block and measure for proper
resistance across the two leads
with a properly calibrated ohm
meter. This check is to be done with the heating ele-
ment at room temperature. The proper ohms for the
RM2201 AC heating element is 152 with a tolerance
range of ten percent. If the resistance is outside the
tolerance range, replace the heating element.
SECTION 4

DC VOLTAGE REQUIREMENTS

For the refrigerator to operate on DC volt operation, DC
voltage must be supplied to the terminal block at the
rear of the refrigerator. The operational range is 10.5 to
15 volts DC. Connecting the refrigerator to an unregu-
lated converter can result in improper operation of the
refrigerator. Check for proper voltage at the terminal
block at the back of the refrigerator. If power is outside
the operational range, correct the power supply prob-
lem. The power supply to the refrigerator must be fused.
The DC heating element will draw 7.9 on RM2150,
RM2190 and RM2201 at 12 volts. The maximum fuse
size is 10 amps for the RM2150, RM2190 and RM2201.
SECTION 5

DC COMPONENTS

5.1 SWITCH

A. TOGGLE SWITCH (RM2150/
RM2190)
The Toggle Switch should be checked
for continuity in the following manner:
Remove wires from the assembly.
In the "ON" position, continuity should exist.
In the "OFF" position, no continuity should exist.
If either check is incorrect, the switch is defective and
must be replaced.
6
B. SELECTOR SWITCH (RM2201)
The Selector Switch should be
checked for continuity in the
following manner: Remove all
wires from the assembly.
For the DC mode, continuity should
exist between terminals 1 and 2 and
5 and 6.
For the AC mode, continuity should exist between
terminals 3 and 4 and 7 and 8.
If continuity does NOT exist in any mode when making
these checks, the switch is defective and must be
replaced.
PIEZO I G N I T E R
5.2
The piezo lighter is a self-contained assembly which
generally does not need maintenance. When the button
is pushed, a spring loaded striker creates a spark. If
there is no resistance when pressing the button, the
piezo igniter is defective and must be replaced. If the
piezo snaps or has resistance when the button is
pushed, but there is no spark, the problem lies in the
electrode (see Sec. 5.3).
5 . 3 E L E C T R O D E
To check the electrode, first visually inspect it for cracks
or breaks on the ceramic insulator. Also, verify the
mounting bracket is attached properly to the electrode.
If either of the above conditions are found, replace the
electrode. Next, check the spark gap. It must be set at
three sixteenths (3/16) of an inch and the tip of elec-
trode above the slots in the burner.
BUR
NOTE: If piezo igniter (See Sec. 5.2) is good and there
is no spark at the tip of the electrode, REPLACE THE

ELECTRODE.

HEATING ELEMENT
5.4
The heating element is designed to deliver a predeter-
mined amount of heat to the cooling unit. Check the
heating element with ohms resistance using a properly
calibrated ohm meter. This check is to be done with the
element at room temperature. The proper ohms for
RM2150, RM2190 and RM2201 is .66 with a tolerance
range of (10) percent. If the heating element is outside
the tolerance range, replace it.