Lennox FLEXY II Series

IOM – FLEXY II – 1007 – E Page 55
GAS BURNER FIRE-UP SEQUENCE
HEATING
: GAS BURNER
Operation
from
cont rol
Thermostat GAZ =Closed
Supply Thermostat Limit?
(Auto Reset)
Fault o n CL I MATI C
Extraction Fan ON
AI R P r e s s u r e S w i t ch ON
Backfire Thermostat ON?
Gas Control
Valv e 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 Valv e Open
Ionisation 1second after
the end of sparking?
Gas Valv e
remains
Open
Gas Contr
ol
Valv e Closes
BURNER STOPS
Fault o n Gas
Control Block
Signal from Ionisation
probe still ON
?
Air Press Switch ON
or Backfire Thermostat?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES