Mr. Heater MH40NG Instruções de Operação descarregar pdf (Página 6)

InstallationInstructionsandOwner’sManual

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. Alwaysreplacecoverscrewafteradjustmentandtightenrmly

to ensure proper operation.

Manual gas

control knob

Wrench

boss

Gas

inlet

Pilotstat

power unit

Pressure regulator

adjustment(beneath

coverscrew)

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

(beneathcoverscrew)

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

Burnerlightoffveryslow Partiallyblockedpilotorice Re-adjustpilot

Pilot out of adjustment Replace

Burnerlightoffveryslowly Partiallyblockedburnerorice Replace

Color stays dull

Burner ﬂashback Low gas pressure Correct line pressure or call your gas

(roaringnoiseduringoperation  supplier

andceramicgridsurfacewillbedark) Damagedburner Replace

Ceramic grid or burner sooting up

(whenneworaftercleaning) Firstcheckfordamaged Replaceifdamaged

 burnerorice

 Ifburneroriceisnotdamaged

then check for damaged manifold. Replace

Pilotcannotbeignited Blockedpilotorice 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

  Openandadjust(seeFigure8)

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

 Blockedburnerorice Replace

  Cleanoriceorreplace

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

shutdownandagainbeforethenextuse.

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.

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