Delta PG PLUS-25 - Manual (Page 67)

61
Maintenance Procedures
Check Boiler Relief Valve
Inspect the relief valve and lift the lever to
verify flow at least annually or as recom-
mended on the warning tag of the valve.
B e f o re manually operating the pre s s u re
relief valve ensure the discharge piping is
d i rected to a suitable place of disposal to
avoid a potential scald hazard. The dis-
charge piping must be full size without
restriction and installed to permit com-
plete drainage of both the valve and line.
If after closing the valve, the valve fails to
seat properly or continually weeps, replace
the relief valve. Ensure the cause of the
relief valve to weep is the valve itself, not
due to system over-pressurization caused
by an expansion tank that is waterlogged or
undersized.
Check Temperature / Pressure Relief Valve
Inspect the T&P relief valve and lift the
lever to verify flow at least annually or as
recommended on the warning tag of the
valve.
B e f o re manually operating the pre s s u re
relief valve ensure the discharge piping is
d i rected to a suitable place of disposal to
avoid a potential scald hazard. The dis-
charge piping must be full size without
restriction and installed to permit com-
plete drainage of both the valve and line.
If after closing the valve, the valve fails to
seat properly or continually weeps, replace
the relief valve. Ensure the cause of the
weeping is the valve itself, not due to ther-
mal expansion or a faulty or under-pressur-
ized thermal expansion tank.
Inspection of Ignition Electrode
Remove the ignition electrode from the
burner mounting plate.
Remove any white oxides accumulated on
the electrode using fine grit sandpaper or
steel wool. If the electrode does not clean to
a satisfactory condition, replace the ignitor.
When replacing the ignition electrode,
ensure the gasket is in good condition and
correctly positioned.
Check Ignition Wiring and Ground Wiring
Inspect the burner wiring from the burner
control module to the ground terminal
behind the control panel.
Ensure wiring is in good condition and
securely connected.
Check ground continuity of the wiring
using a continuity meter.
Replace and correct ground wire if ground
continuity is not completed and satisfactory.
Check Control Wiring
Inspect all control wiring located behind
the control panel and at the burner control
module. Ensure wiring is in good condi-
tion and properly connected.
Check Thermostat Limit Settings
Check the position of the Secondary and
Primary Thermostat knobs, refer to Figure 38
and 39 page 54 for recommended settings.
Perform Start-up and Checkout Procedures
Start the unit and perform the start-up pro-
cedure as listed in this manual.
Verify the cold water fill pressure is correct
and the operating pressure of the primary
system is within normal operating range.
Complete the checkout procedures as refer-
enced in this manual.
WARNING
WARNING