Hamilton Engineering XL800, Installing, Operating & Maintaining

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PART 7. SERVICE AND MAINTENANCE
PART 7. SERVICE AND MAINTENANCE
A. SERVICING THE APPLIANCE
1. Shut off the power supply to the
appliance (See Part 1, Section D).
2. Turn the front cover security latch.
3. Undo the two latches at the
bottom of the cover (if applicable).
4. Remove the cover.
1. Replace the front cover in the
normal position.
2. Close the security latch.
3. Turn on the power supply to the
appliance.
B. PLACING THE APPLIANCE INTO NORMAL OPERATION
To enter manual firing operation, enter SERVICE, in MODE—see Part 6, Section D
C. TESTING THE MANUAL RESET HIGH LIMIT
To test the manual reset high limit:
1. Enter Setup menu, then enter the
Password, then Test M R High Limit
2. Set the temperature you want
the MHRL to open at, it will show
the current setting as a default,
you should select a temperature
less than that to complete the test
without overheating the hot water
system, just push the down arrow
until the appropriate temperature
and then push √:
1
2
The HOT™ Controls (.2 configuration), contain a unique function, they use both pressure transducers and
temperature thermistors to monitor appropriate flow through the heat exchanger of the appliance. The .3
configuration uses a water flow switch. In both configurations, there are two high limit sensors, both are set through
parameters, however, only one requires a manual reset when it is tripped, and often requires an annual test to
confirm its proper operation.