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2
Maintenance
Review with owner
1. Review the Crest User's Information Manual with the
owner.
2. Emphasize the need to perform the maintenance
schedule specified in the Crest User's Information
Manual (and in this manual as well).
3. Remind the owner of the need to call a licensed
contractor should the boiler or system exhibit any
unusual behavior.
4. Remind the owner to follow the proper shutdown
procedure and to schedule an annual start-up at the
beginning of the next heating season.
Cleaning boiler heat exchanger
1. Shut down boiler:
• Follow the "To Turn Off Gas to Appliance"
instructions for the boiler in Section 9 - Startup.
• 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 top access panel to gain access to the
burner top plate assembly.
4. Access to the heat exchanger can be gained by removing
the burner through the manifold cover or by removing
the entire top plate assembly (reference FIG. 2-3 on
page 38 of this
manual).
It is recommended that care should be
NOTICE
taken to avoid getting the fiber board
wet in the cleaning process.
The boiler contains ceramic fiber
⚠WARNING
materials.
these materials per instructions on this
page. Failure to comply could result in
severe personal injury.
5. Remove the necessary components to gain the needed
access for heat exchanger cleaning, see FIG. 2-2.
6. Use a vacuum cleaner to remove any accumulation on
the tube sheet surfaces. Do not use any solvent.
7. Brush the heat exchanger (tube sheet, combustion
chamber walls, and tube entry) while dry using a nylon
bristle brush. Caution: DO NOT use a metal brush.
Re-vacuum the heat exchanger.
8. Finish cleaning using a clean cloth dampened with
warm water.
(continued)
Use care when handling
9. Temporarily remove the condensate drain line from the
condensate trap and route directly to a drain.
10. Rinse out debris with a low pressure water supply. The
water will drain through the condensate connection.
11. Allow the heat exchanger to thoroughly dry.
12. Reconnect the condensate drain line to the condensate
trap.
13. Close isolation valves on piping to isolate boiler from
system. Attach a hose to the boiler drain and flush boiler
thoroughly with clean water by using purging valves to
allow water to flow through the water make-up line to the
boiler.
14. Re-assemble all parts in the reverse order of disassembly
ensuring all gaskets are in good condition and that all
torque specifications are followerd as depicted in FIG. 2-3.
Note: All seals should be leak checked and re-torqued after
the unit heats up and cools down.
15. After firing the unit, re-tighten the nuts to the torque
specifications in FIG. 2-3 on page 38. After the final
tightening of the nuts with the blower at high RPMs, check
for leaks around the burner assembly.
16. Restore boiler to operation.
17. Perform start-up and check-out procedures in the Check
Flame and Combustion - Section 9 - Startup of the Crest
Installation and Operation Manual.
Service Manual
39
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