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13
! ! WARNING
DO NOT USE A FLAME
TO CHECK FOR GAS LEAKS.
C. Check the control system by connecting/disconnecting
120 volt AC power, start/stop the engine, etc. Compare
the operation with the operation described in
Section C.
Operation Instructions.
D. The LP gas pressure should be checked and the main
regulator readjusted if pressure is incorrect. The correct
operating pressure is 11 inches of water column. The
correct place to take the LP gas pressure is at the test
port just ahead of the burner jet. (See FIG. 12).
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E. Inspect the flue baffle. It should be reasonably clean and
free of soot. Heavy soot formation indicates improper
functioning of the burner. The flue and burner both require
cleaning in the following manner:
1) Unplug the refrigerator power cord from the 120 volt
AC outlet (see FIG. 6).
2) Disconnect or shut off the 12 volt power to the
refrigerator.
3) Turn manual shutoff valve to OFF. (See FIG. 6 & 12).
4) Remove cover from the burner housing. (See FIG . 6).
5) Disconnect the wire from the high voltage electrode.
6) Remove the burner mounting screws and remove the
burner assembly.
7) Remove the flue cap from top of flue tube and lift out
the wire and spiral baffle. Clean the flue from the top
using a flue brush. Blowing compressed air into the
flue will not properly clean soot and scale out of the
flue tube. Replace spiral baffle and flue cap.
8) Clean burner tube with a brush. Blow out burner with
compressed air.
9) Before removing burner jet, clean burner area of soot
and scale that fell out of flue tube. Remove the burner
jet. Soak the jet in wood alcohol and blow it out with
compressed air. Reinstall and tighten burner jet.
DO NOT use a wire or pin when cleaning the burner jet
as damage can occur to the precision opening. This can
cause damage to the refrigerator or create a fire hazard.
10) Reinstall burner, being careful that the end of the
burner fits into the slot on the burner bracket. Check
to make sure slots are centered under the flue tube
and the thermocouple is positioned properly (tip of
thermocouple extends over two slots of burner).
11) Be sure to reconnect the wire to high voltage elec-
trode. Check the electrode for proper location and
gap. (See FIG. 13).
ELECTRODE
BURNER T UBE
1/8' T O 3/16'
(3-5 mm)
12) Turn on manual gas shutoff valve and check all
fittings for leaks.
13) Connect 120 volt power cord to the outlet and
reconnect or turn on the 12 volt DC power.
14) Check LP gas safety shutoff. See
Dometic Rv Thermostat Troubleshooting
Section A. Instal-
lation, Item 9. Testing LP Gas Safety Shutoff.
FIG. 13
F. FUSES
The 2-way models are equipped with 2 fuses, one for the
refrigerator control system and one for the AC cartridge
heater (see Table below). To replace fuse(s) proceed as
follows:
1. Disconnect the wall plug, and the 12 volt wires.
2. Remove the power module cover. See FIG. 6.
3. Snap the fuse out of the fuse holder.
4. Fit a new fuse in to the fuse holder.
5. Replace the power module cover.
Control System 3-amp
AC Heater 5-amp
3. TROUBLESHOOTING
Refrigerator Does Not Cool Properly
A. Burner jet clogged.
Clean. See
Section D. Maintenance & Service, Item 1.
Periodic Maintenance, Paragraph E. Item 1–14.
B. Check level of refrigerator.
C. Venting problem.
Restriction in air flow across cooling unit.
D. Heavy frost buildup on evaporator fins.
Defrost.
E. Flue baffle not inserted properly in flue tube.
F. Improperly set thermostat.
Dometic Rv Ac Units
See
Section C. Operating Instructions, Item 3.
Paragraph F.
G. Burner dirty.
Dometic Ac Service Manual
Clean. See Section D. Maintenance & Service, Item 1.
Periodic Maintenance, Paragraph E.8.
H. LP gas pressure low at burner.
Set main regulator so pressure does not drop below 11
inches water column at pressure tap.
I. Burner not located properly under flue tube.
Relocate.
J. Burner damaged.
Replace.
K. Odors and fumes.
1. Dislocated burner.
2. Damaged burner
3. Dirty flue tube.