Dometic RM3604 Скачать руководство пользователя страница 6

Страница: 6 / 16

DIAGNOSTIC SERVICE MANUAL

Dometic

RM3604/3804 AES

Refrigerators

Check the solenoid coil with a properly calibrated ohm
meter. Remove the connector from the solenoid and
measure the resistance across the upper and lower
terminals. The proper reading would be 20 ohms
with tolerance range of ten percent.
Once flame is lit, the thermo-
couple produces the
voltage to keep the
valve open. If for any
reason the thermo-
couple does not
provide enough
current to the valve,
it will close, stopping
the flow of gas. To
check this portion of
the solenoid valve
assembly, verify the thermocouple is good (see
Sec. 6.3), the tip is clean and the receptacle in the
solenoid valve assembly is clean. If the thermocouple
checks good, then replace the solenoid valve assembly.

NOTE

NOTE: If the solenoid ohms check shows an open coil,
the refrigerator will not operate on any mode.

4.4

IGNITER

The igniter is an electronic device that produces high
voltage to create a spark at the burner, only on gas
mode. It also produces and increased DC voltage at the
"L" terminal which is a signal to the circuit board that a
spark has been produced. First, verify proper voltage at
the positive (+) and ground (–) terminals. The reading
should be within one volt of incoming voltage at the main
terminal block. A voltage drop of more than one volt
would indicate a loose connection (see Sec. 7.2) or a
circuit board problem (see Sec. 4.9).

Next, disconnect DC power at refrigerator terminal block.
Remove high voltage cable from igniter. Reconnect DC
power — the igniter should produce a sparking sound. If
not, replace the igniter. With the igniter producing spark,
connect meter leads to "L" and ground (–) terminals on
the igniter, with the meter set on 20 volts DC range or
lower. The meter should read a pulsating voltage. If not,
replace the igniter.

NOTE

NOTE: If a spark is not
produced within 10
seconds, the gas flame
warning lamp will
illuminate. If spark is
produced it will take
three minutes for lamp to
illuminate.
If all of the previous
checks are correct, the
igniter is good – do not
replace.

4.5

HIGH VOLTAGE CABLE

Disconnect DC power at refrigerator terminal block.
Disconnect high voltage cable from electrode. Recon-
nect DC power. If sparking starts, cable is good (see
Sec. 4.6). If no sparking, disconnect DC power. If
sparking sound from igniter, then replace high voltage
cable.

4.6

ELECTRODE

First, do a visual check for
cracks or breaks on the
ceramic insulator.
Verify the mount-
ing bracket is
attached
properly to
the elec-
trode. If
either of
above is
found, replace the electrode. The spark gap must be set
at three sixteenths (3/16") of an inch and tip of electrode
above the slots in the burner.

If igniter (see Sec. 4.4) and high voltage cable (see Sec.
4.5) are good and there is no spark at the tip of the
electrode, replace the electrode.

4.7

RELAY

The relay controls the circuit to the DC heater. The load
(amps) of the DC heater goes through the relay. Verify
that DC volts to the terminal block is 13.3 or more.

With vehicle ignition switch off and no

With vehicle ignition switch off and no
voltage to IGN lock terminal

voltage to IGN lock terminal

Check: Voltage should be
present between
terminals 85 and 30.
If voltage is not
present, check
wiring to both
terminals. (See
Sec. 7.2)

HIGH VOLTAGE

ELECTRODE
TIP

3/16"

BURNER