Lennox BAC020SNM

HEATING: GAS BURNER
BALTIC R410A-IOM-0708-E Page 81
GAS BURNER FIRE-UP SEQUENCE
Operation from control
Thermostat GAZ =Closed
Supply Thermostat Limit?
(Auto Reset)
Fault on CLIMATIC
Extraction Fan ON
AIR Pressure Switch ON
Backfire Thermostat ON?
Gas Control
Valve Closes
BURNER
STOPS
Gas Low Pressure switch?
Gas Ignition Control Block Signal
Normal Operation
6 Minutes Delay
Pre-Ventilation 30 seconds
Fire-up Electrode 4s
Gas Valve Open
Ionisation 1second after
the end of sparking?
Gas Valve remains Open
Gas Control
Valve Closes
BURNER STOPS
Fault on Gas
Control Block
Signal from Ionisation
p
robe still ON
?
Air Press Switch ON
or Backfire Thermostat?
Fig. 60
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES