Lennox BAC020SNM Installation, Operating And Maintenance page 92

HEATING: MODULATING GAS BURNER
BURNER SAFETY CHECKS
Idem non-modulating gas burner
GAS BURNER TROUBLESHOUTING
Idem non-modulating gas burner.
If the valve's flow is not correct, check the operation of the actuator and of the mechanical assembly.
 Replace the actuator if necessary
DISASSEMBLING THE GAS BURNER FOR MAINTENANCE PURPOSES
Idem non-modulating gas burner
MODULATING-GAZ-46KW-C-BOX
Fig. 87
MODULATING-GAZ-60KW-D-BOX
Fig. 88
BALTIC R410A-IOM-0708-E Page 91