Belshaw Brothers and 734CG, 724CG, 718LCG manual Figure A-1. Normal Operating Sequence, MN-1141EN

Models: 718LCG 724CG and 734CG

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START

START

TRIAL FOR IGNITION

MAIN BURNER OPERATION

 

 

 

Thermostat calls for heat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

First main valve opens.

 

 

 

 

 

 

 

 

 

Gas flows to pilot burner.

 

 

 

 

 

 

 

 

 

Igniter-sensor sparks.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pilot burner

 

lights.

 

 

Pilot burner does

 

 

 

 

 

 

 

not light, or

 

Module senses flame current.

 

 

module does not sense flame current.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Module

 

S8600H

 

 

Module

 

S8600F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

System locks out.

 

 

Ignition spark continues.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operator turns thermostat

 

 

After no more than 5 minutes,

 

 

 

 

below 200°F/93°C, moves

 

 

operator turns thermostat

 

 

 

 

on/off switch to OFF, and

 

 

below 200°F/93°C, moves

 

 

 

 

 

 

 

 

 

 

waits at least one minute .

 

 

on/off switch to OFF, and

 

 

 

 

 

 

 

 

 

waits at least one minute.

 

 

 

 

 

 

 

 

 

 

 

 

 

Sparking stops.

Second main valve opens.

Module monitors pilot flame current.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pilot flame fails.

Power is interrupt ed.

Thermostat stops

 

 

 

 

 

 

calling for heat .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main valve closes.

 

System shuts off. (Restarts

 

Valves close.

 

 

 

when power is restored.)

 

Burners shut off.

 

 

 

 

 

 

 

 

Figure A-1. Normal Operating Sequence.

Belshaw Bros., Inc. 1750 22nd Ave. S. Seattle, WA 98144 Phone 206-322-5474 Fax 206-322-5425

718LCG, 724CG, and 734CG Gas Fryers

MN-1141EN

A-3

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Belshaw Brothers manual Figure A-1. Normal Operating Sequence, 718LCG, 724CG, and 734CG Gas Fryers, MN-1141EN