Install Instructions

80
The boiler contains ceramic fiber
materials. Use care when handling these
materials per instructions on page 79.
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 fluids
in the 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
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 (Combi Only)
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 fluids
in the 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
(Combi Only)
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 DHW flow switch (as shown
in FIG. 12-3 on page 81). Slide the flow sensor off the
DHW flow switch.
5. Using an adjustable wrench, remove the DHW flow switch
assembly from the unit (FIG. 12-3).
6. Remove the filter from the DHW 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 DHW flow switch. Reinstall the
DHW flow switch back into the unit and place the flow
sensor back onto the DHW flow switch.
8. If cleaning is unsuccessful, replace the DHW flow switch
assembly.
9. Reinstall the front access panel removed in Step 3 and
resume operation.
FIRE TUBE
™