Delta PG PLUS-25 - Manual (Page 68)

62
Maintenance Procedures
Check Burner Flame
Inspect the burner flame through the obser-
vation port on the burner mounting plate.
If flame pattern is not fully blue and covers
the entire burner surface, shut the unit
down and allow it to cool thoroughly.
Close the manual gas valve on the gas sup-
ply line and disconnect the gas piping to
remove the burner assembly from the unit.
Remove the burner head mounting screws
and remove the burner head. Inspect the
head for deterioration. Use compressed air
or a vacuum to clean the burner head.
Remove the venturi and gas valve assem-
bly from the blower.
Use the vacuum cleaner or compressed air
to clean the interior of the blower assembly.
Inspect the blower blades to ensure they are
clean and not damage.
Re-assemble the venturi and gas valve onto
the blower. Ensure the venturi gasket is in
good condition and positioned correctly.
Re-assemble the burner head onto the
mounting plate. Ensure the burner head
gasket is in good condition and positioned
correctly.
Re-assemble the gas supply connection and
open the manual gas valve placing the unit
back into service.
Flame Signal
The flame signal should be at least 0.6µ Α.
Refer to the PERFORMANCE PLUS
Trouble-shooting Guide for information on
checking the flame signal.
Check the ignitor for fouling or damaged
insulation if a low flame signal is read.
Check ground wiring and continuity as a
cause for low flame signal. Replace igni-
tor if ground and continuity conditions
are satisfactory.
Check Combustion Levels
Refer to page 53 of this manual for mea-
suring combustion levels and burner
adjustments.
Review With Owner
Ensure the owner understands the impor-
tance to perform the maintenance schedule
specified in this manual.
Remind the owner of the importance to call
a licensed contractor should the unit or sys-
tem exhibit any unusual behavior.