Lennox BAC020SNM Installation, Operating And Maintenance page 81

HEATING: GAS BURNER
BURNER SAFETY CHECKS
Smoke extractor pressure switch Test.
 With the gas burner running, disconnect the flexible tube
fitted to the pressure taping on the pressure switch (Fig.
57).
 The Flame must disappear and the extraction fan must
carry on running.
 However, NO fault will be displayed (Gas ignition control
block or CLIMATIC).
Fig. 57
 After reconnecting of the tube, the Burner will restart
after a period of 30 to 45 seconds pre-ventilation.
Gas pressure switch test
 With the gas burner running, close the shut off valve
located before the rooftop. (fig. 58)
Fig. 58
 The burner stops completely.
 However, No fault light will be displayed on the Gas
ignition control block. After 6 Minutes, the CLIMATIC will
display a fault.
 Reset the CLIMATIC.
BALTIC R410A-IOM-0708-E
Ionisation Probe test
 With the gas burner running, disconnect the terminal plug
coming from the ionisation probe to the gas ignition
control box.
Fig. 59
 The flame disappears
 The fan is still running and attempting to restart the
burner (restart cycle 30 to 45 seconds).
 if the ignition probe is not reconnected at the end of the
ignition sequence the burner will stop completely.
 The fault light on the gas ignition control block is ON.
 Manually reset the gas ignition control block to eliminate
the fault
IN CASE OF PROBLEMS REFER TO THE START UP
SEQUENCE FLOWCHART NEXT PAGE
Page 80