Sanyo CG1411 User Manual download pdf (Page 34)

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

Exhaust

Refrigerant

heater

Supply

Gas inlet

Joint

Solenoid

valve 1

Solenoid

valve 2

Combination

gas valve

Flame sensor

probe

Ignition

electrical rod

Air

Combustion

blower fan

Ignition

circuit

Timer circuit

Pre-purge circuit

Combustion

blower motor

Flame sensor

circuit

Power

supply

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Sanyo CG1411 User Manual Page 34