8-1-3. Combustion Control

(1) Combustion

Combustion air is supplied into the burner for 20 seconds prior to ignition. The variable speed combustion air blower motor speed is sensed and controlled. After this pre-purge is competed, spark ignition is provided at the burner. Burner condition is monitored continuously during the burning period.

(2) Safety Controls

Following safety devices function to control the gas solenoid valve to shut off

Flame Detection Circuit: Stops gas flow with flame sensor circuit

Bimetal Thermostat:

Stops gas flow with bimetal thermostat at 221°F (105°C)

Thermal Fuse:

Stops gas flow with thermal fuse at 302°F (150°C) — replaceable fuse

Fuse-Control Circuit:

Protected by internal 3A and 5A device

 

Supply

 

 

 

Gas inlet

 

 

 

 

Exhaust

Joint

Refrigerant

heaterSolenoid valve 1

Solenoid

valve 2

Combination

gas valve

Ignition

Flame sensor

electrical rod

probe

Flame sensor

 

Air

circuit

 

 

Combustion

Combustion

 

blower fan

 

blower motor

 

 

 

 

Ignition

Timer circuit

 

circuit

 

 

Pre-purge circuit

Power supply

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Sanyo CG1411, KGS1411 service manual Combustion Control, Safety Controls

KGS1411, CG1411 specifications

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