70
Maintenance Procedures
Check Control Wiring
Inspect all control wiring. Ensure wiring is in
good condition and properly connected.
Check Control Settings
1. Review all boiler settings in the Heating &
DHW EZ Setup menus. Adjust settings as
necessary, see page 43-45
2. Check any external limit control settings (if
used). Adjust settings as necessary.
Perform Start-up and Checkout Procedures
Start the unit and perform the start-up proce-
dure as listed in this manual.
Verify the cold water fill pressure is correct and
the operating pressure of the boiler is within
normal operating range.
Complete the checkout procedures as refer-
enced in this manual.
Check Burner Flame
Inspect the burner flame through the observa-
tion port on the heat exchanger.
If flame pattern is not fully blue and covers the
entire burner surface during high fire, shut the
unit down and allow it to cool thoroughly before
disassembly.
Close the external manual gas valve on the gas
supply line and disconnect the gas piping and
gas valve wire harness connector.
Disconnect the wiring harness connectors from
the blower and remove the blower retaining
screws or nuts. Remove the blower from the
unit.
Remove the mounting nuts securing the burner
mounting plate to the heat exchanger and set
aside.
Carefully remove the burner mounting plate
assembly from the heat exchanger. Ensure
combustion chamber insulation is not damaged
during removal of burner mounting plate
assembly. See WARNING on page 72.
Remove the burner head mounting screws and
remove the burner head. Inspect the burner
head for deterioration. Use compressed air or
a vacuum to clean the burner head.
Remove the venturi and gas valve assembly
from the blower.
Use a vacuum cleaner or compressed air to
clean the interior of the blower assembly.
Inspect the blower blades to ensure they are
clean and not damaged.
Re-assemble the venturi and gas valve onto the
blower. Ensure the venturi gasket is in good
condition, positioned correctly and replace gas-
ket if necessary.
Re-assemble the burner head onto the burner
mounting plate. Ensure the burner head gasket
is in good condition, positioned correctly and
replace gasket if necessary.
Re-assemble the burner mounting plate assem-
bly onto the heat exchanger. Ensure the burner
plate gasket and combustion chamber insula-
tion is in place and not damaged, replace gas-
ket and insulation if necessary. See WARNING
on page 72.
Re-assemble the blower onto the burner
mounting plate and reconnect the wiring har-
ness connectors.
Re-assemble the gas supply connection and
wire harness to gas valve. Open the external
manual gas valve. Check gas piping for any
leaks as outlined on page 55 and repair if nec-
essary. Place the unit back into service.
