68
PHTM II
Installation, Operating & Service Instructions
110331-01 - 5/20
WARNING
Component Damage.
Do not over tighten burner door mounting nuts.
Doing so could break burner door mounting
studs. If any of these studs is damaged, heat
exchanger must be replaced. Use of a short 10
mm box wrench will reduce risk of damaging
these nuts.
18 Service and Maintenance (continued)
Figure 18-4: Condensate Trap Exploded Parts View
Condensate Tube
from heat exchanger
Condensate
Trap Vent
Condensate Trap
Ball Float
Float
Support
Gasket
Float
Support
Cleanout
Cap O-Ring
Cleanout
Cap
Cleanout
Cap Nut
Trap Vent
(bottom panel)
NOTICE: Attempting to clean heat exchanger
or trap with anything other than water or vinegar
could result in condensate backup, causing boiler
to shut down.
10. Reinstall burner door/blower/gas valve
assembly.
Follow above steps in reverse order.
!
11. Inspect vent system.
A. All gaskets and joints between boiler heat
exchanger and terminal are leak tight.
B. All supports are intact and vent system is
properly pitched.
C. All pipe is in good condition. Look for
damage such as cracks, heat distortion,
and embrittlement. If any such damage is
found, pipe must be replaced and cause of
damage identified.
D. Vent/air terminals are in good condition,
free from blockage and still correctly
located relative to doors, windows, decks, etc.
E. Refer to Sections 7 thru 9 to re-assemble
any vent system components that are
disassembled during this inspection and for
details on supporting, pitching and
terminating vent system.
12. Inspect hydronic system and DHW piping.
A. Look for leaks and repair if found. If system
contains antifreeze, or other additives, test
and/or maintain them as directed by additive
manufacturer.
B. Refer to Appendix B for important information
on quality and boiler additives.
13. Flush plate heat exchanger.
Back-flush (against normal flow) DHW loop to
remove scaling. Vinegar can be used to help
remove deposits.
14. Inspect safety relief valve.
WARNING
Explosion Hazard.
Safety reflief valves require periodic
maintenance. Refer to relief valve
manufacturer's instructions for frequency and
proper procedure. Any testing or maintenance
shall be done by qualified service technician.
15. Place boiler back into operation.
A. Replace any wiring which has been
disconnected.
B. Perform visual inspection of gas piping
to ensure no inadvertent damage to gas train
components during servicing.
C. Follow all instructions in Section 15 Start up
and Checkout to place boiler back in service,
including performance of combustion test.
16. Test boiler flow switch.
A. Start with boiler in standby.
B. Either close a shut off in boiler loop or unplug
boiler pump at connecter.
C. Initiate a call for heat and confirm that boiler
shows an Active Fault indicating flow switch is
open.
WARNING
Component Damage.
If burner comes on with no flow through boiler,
there is a problem with flow switch. Turn boiler
off immediately. Failure to do so could result in
severe heat exchanger damage.
17. Assure that all safety and operating controls
and components are operating properly before
placing boiler back in service.
!
!
To Next Page
Loading...
