6
InstallationInstructionsandOwner’sManual
Model # MH40NG/LP
a. Remove pilot adjustment cover screw. Refer to Figure 8.
b. Turn inner adjustment screw clockwise to decrease or counter-
clockwise to increase pilot flame.
c. Alwaysreplacecoverscrewafteradjustmentandtightenrmly
to ensure proper operation.
Manual gas
control knob
Wrench
boss
Gas
inlet
Pilotstat
power unit
Pressure regulator
adjustment(beneath
coverscrew)
Install long
screw in
outside corner
Standard
pressure
regulator
(“A”model)
Step
opening
regulator
(“C”model)
Pilot gas
outlet
(pressure
tapping
directly
beneath)
Pilot flow adjusting screw
(beneathcoverscrew)
Figure 8. Top view of standard capacity gas control.
TABLE 4. TROUBLESHOOTING CHART
Below in chart form are various symptoms of a malfunctioning
system, possible defects that will cause there symptoms and
suggested corrective measure. The chart assumes that the proper
gas pressure is available to the heater and that the lighting
procedure is as stated on the plate attached to the heater.
SYMPTOMS CAUSES SOLUTIONS
Burnerlightoffveryslow Partiallyblockedpilotorice Re-adjustpilot
Pilot out of adjustment Replace
Burnerlightoffveryslowly Partiallyblockedburnerorice Replace
Color stays dull
Burner flashback Low gas pressure Correct line pressure or call your gas
(roaringnoiseduringoperation supplier
andceramicgridsurfacewillbedark) Damagedburner Replace
Ceramic grid or burner sooting up
(whenneworaftercleaning) Firstcheckfordamaged Replaceifdamaged
burnerorice
Ifburneroriceisnotdamaged
then check for damaged manifold. Replace
Pilotcannotbeignited Blockedpilotorice Replace
Gas cock not in position
Pilot gas flow adjustment screw may be closed Gas control knob must be turned to pilot
and held depressed
Openandadjust(seeFigure8)
Pilot lights but goes out Defective thermocouple Replace
Defective control Replace
Pilot stays lit but main burner will not light Loose wire or improperly wired Tighten connections, check wiring
Defective control diagram
Blockedburnerorice Replace
Cleanoriceorreplace
Failure to ignite Main gas off Open manual valves
Air in gas line Bleed gas line
Loose wire connections Tighten wire connections
Dirty wire connections Clean terminals and secure terminals
13. REPLACING THE GAS VALVE UNIT
a. Remove the two gas valve unit wires at the gas control valve
labeled “PP.”
b. Unscrew gas valve from gas piping.
c. Reconnect gas valve and unit wires to terminals “PP.” Be sure
to leave thermostat wire on one terminal.
14. FREQUENCY OF OPERATOR CHECKS
Intermittent Use
Appliances that are used seasonally should be checked before
shutdownandagainbeforethenextuse.
Dusty, wet or corrosive environment. Since these environments
can cause the gas control to deteriorate more rapidly, the system
should be checked more often.
The gas control should be replaced if:
a. It does not perform properly on checkout or troubleshooting.
b. The gas control knob is hard to turn or push down, or it fails
to pop back up when released.
(20 Seiten)
(32 Seiten)
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