Section #: Title
12
©Aqua-Hot®
600D and 675D Use and Care Guide
Maintenance
Maintenance Schedule
Monthly Maintenance
Check the Aqua-
Hot’s antifreeze and water heating
solution to ensure that it is at the proper level. This can be
accomplished by visually checking the coolant level in the Aq-
ua-
Hot’s expansion tank; reference figure 5, page 14.
Please note that the coolant level should be checked
ONLY when the Aqua-Hot is at maximum operating tempera-
ture. This should be done immediately after the burner cycles
off.
At maximum operating temperature, the antifreeze
and water heating solution should be at the level marked
“HOT” on the expansion tank.
Run the interior heating zones until you feel warm air
blowing out of the heat exchangers.
Run the burner once a month. This will ensure proper
operation of the burner.
Replenishing the Antifreeze and Water Heating Solution
If the antifreeze and water heating solution needs
replenishing, remove the cap for the expansion bottle and fill
it to the “HOT” mark. Replace the expansion bottle cap when
this is complete.
Reference appendices A through C in order to deter-
mine the correct ratio of antifreeze to water, the proper type of
antifreeze, and the water quality recommendations for the
Aqua-Hot antifreeze and water heating solution. Reference
appendix D for the proper tool and instructions for usage in
measuring the system’s antifreeze mixture ratio.
Annual Maintenance
To keep the diesel burner running smoothly, a tune-
up, or annual service should be performed on the unit. An an-
nual service consists of a new fuel nozzle and fuel filter. To
ensure best diesel-burner performance, always use the rec-
ommended fuel nozzle and fuel filter when replacing these
parts.
When the Aqua-Hot is at maximum operating temperature,
the coolant will be very hot. If the Aqua-
Hot’s heating sys-
tem is accessed, scalding by hot vapor or coolant could
result. Before cleaning or servicing, disconnect all power
supplies
DO NOT operate the burner and/or the electric heating ele-
ment without the antifreeze and water heating solution in
the Aqua-
Hot’s boiler tank. Doing so will cause serious dam-
age to the heater.
Propylene glycol that is “Generally Recognized As Safe” by
the FDA must be utilized for the antifreeze and water heating
solution.
NOTE: For additional information regarding this propylene-
glycol based, boiler type antifreeze that has been “Generally
Recognized As Safe” by the FDA, please reference Appendix
A, contact Aqua-Hot Heating Systems Technical Support
Department at +1 (800) 685-4298, or visit our website at
www.aquahot.com.
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