73
The boiler contains ceramic fiber
materials. Use care when handling these
materials per instructions on page 72.
Failure to comply could result in severe
personal injury.
WARNING
Cleaning the boiler heat exchanger
1. Shut
down
boiler:
• Follow the “To Turn Off Gas to Appliance” instructions
for the boiler in Section 10 - Startup of the Lochinvar
Combi Boiler Installation and Operation Manual.
• Do not drain the boiler unless it will be exposed to
freezing temperatures. If using freeze prevention fluid
in system, do not drain.
2. Allow time for the boiler to cool to room temperature if
it has been firing.
3. Remove the front access panel.
4. Disconnect the wiring and reference hose from the gas
valve.
5. Disconnect the wiring from the fan assembly.
6. Disconnect the ignition cable and ground wire from the
igniter.
7. Using a 3 mm Allen wrench, remove the four (4) screws
securing the gas valve flange to the gas valve assembly.
8. Using a 5/16" nut driver, loosen the ratchet clamp
connecting the air intake to the venturi.
9. Using a 10 mm wrench, remove the six (6) nuts securing
the heat exchanger top plate to the heat exchanger.
10. Remove the heat exchanger top plate, gas valve, fan and
venturi as one assembly and set aside.
11. Remove the condensate trap from the bottom of the heat
exchanger. Place a bucket underneath the condensate
fitting attached to the heat exchanger for drainage.
12. Use a vacuum cleaner to remove any accumulation on the
boiler heating surfaces. Do not use any solvent.
13. Using a clean cloth dampened with warm water, wipe out
the combustion chamber. Do NOT use a metal bristled
brush.
14. Rinse out debris with a low pressure water supply.
15. Allow the heat exchanger to thoroughly dry.
16. Reassemble the unit in reverse order of component removal
and reinstall the condensate trap.
12
Maintenance
(continued)
Installation & Service Manual
CAUTION
Damaged gaskets and seals in the system
can result in substantial property damage.
Ensure that damaged or torn gaskets are
replaced.
17. Perform start-up and check-out procedures in the
Check
Flame and Combustion - Section 10 Startup
of this
manual.
18. Resume operation.
Cleaning the combi boiler brazed
plate heat exchanger
1. Shut
down
boiler:
• Follow the “To Turn Off Gas to Appliance” instructions
for the boiler in Section 10 - Startup of the Lochinvar
Combi Boiler Installation and Operation Manual.
• Do not drain the boiler unless it will be exposed to
freezing temperatures. If using freeze prevention fluid
in system, do not drain.
2. Shut off domestic water supply.
3. Isolate/disconnect the domestic water piping leading to
the domestic water inlet and outlet.
4. Flush the brazed plate heat exchanger.
5. Follow the above steps in reverse order to place the boiler
back into service.
6. Resume
operation.
DHW flow switch filter cleaning
1. Shut
down
boiler:
• Follow the “To Turn Off Gas to Appliance” instructions
for the boiler in Section 10 - Startup of the Lochinvar
Combi Boiler Installation and Operation Manual.
2. Allow time for the boiler to cool to room temperature if it
has been firing.
3. Remove the front access panel.
4. Locate the flow sensor on the flow switch (as shown in FIG.
12-3 on page 74). Slide the flow sensor off the flow switch.
5. Using an adjustable wrench, remove the flow switch
assembly from the unit (FIG. 12-3).
6. Remove the filter from the flow switch and clean by either
blowing water or air into the open end of the filter
as shown in FIG. 12-4.
7. Reinstall the filter to the flow switch. Reinstall the flow
switch back into the unit and place the flow sensor back
onto the flow switch.
8. If cleaning is unsuccessful, replace the flow switch assembly.
9. Reinstall the front access panel removed in Step 3 and
resume operation.
F I R E T U B E C O M B I
™
