IGNITION SEQUENCE

First Stage – Trial For Pilot Ignition

On every call for heat (system start), the S86 performs an internal safe-start check and shows that a flame-simulating condition is present. During a normal start, the S86 opens the pilot valve in the gas control. This allows gas to flow to the pilot burner. Simultaneously the electronic spark generator in the S86 produces a 30,000 volt pulse output. This voltage produces a spark at the pilot burner igniter/sensor rod, igniting the gas flow around the electrode. If the pilot flame is not detected during the trial for pilot ignition, the S86H contains a safety lockout timer (90 Seconds) to limit the ignition period.

Second Stage – Main Burner Operation

When the Pilot flame is established, a flame rectification circuit is complete to the burner ground. The S86 flame sensing circuit detects the flame circuit and shuts the spark generator off. At the same time the second operator (main gas valve) is opened in the gas control, allowing gas flow to the burners. This pilot flame ignites the main burner conventionally.

Safety Lock Out Time.

The safety lockout timer circuit starts timing the moment the trail for the pilot ignition starts. When the timing periods runs out, the trial for ignition ends, and the control module goes into lockout. Before another attempt to start can be made, the S86 must be reset. Reset by adjusting the thermostat or controller below room temperature, or to its "OFF" position. An alternate method is to shut the system power "OFF". If normal ignition does not occur, use the trouble shooting table to determine the problem.

START

STAGE 1

TRIAL FOR IGNITION

1.CONTROLLER CALLS FOR HEAT

2.SPARK GENERATOR POWERED

First valve (Pilot) operator opens

3. PILOT BURNER OPERATION

Pilot burner lights.

OR

Pilot burner does not light.

Module senses

 

After 90 seconds system

flame current.

 

locks out: must be

 

 

manually reset.

STAGE 2

MAIN BURNER OPERATION

END

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4.FLAME CURRENT SENSED

•Spark generator off.

•Second valve operation (main) opens

5.MAIN BURNER OPERATION

Module monitors pilot flame current

6. CONTROLLER SATISFIED

Valves close, pilot and main burners are off

POWER INTERRUPTION System shuts off, restarts when power is restored

PILOT FLAME FAILURE Main valve closed.

Module start trail for ignition.

Part # MCOSM06 Rev 1 (11/03/08)

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Garland 200 service manual Ignition Sequence, First Stage Trial For Pilot Ignition, Second Stage Main Burner Operation
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200 specifications

Garland 200 is an innovative and versatile piece of equipment that has made a significant impact in various industries due to its advanced features and technologies. Designed for efficiency and performance, the Garland 200 stands out with its unique combination of high-quality materials and cutting-edge engineering.

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