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This manual is designed to aid trained and qualified service
technicians with the process of troubleshooting and servicing
the Aqua-Hot 375D Hydronic Heating System.
The Aqua-Hot features a 12 Volt-DC powered Diesel-Burner
and a 120 Volt-AC, 1500-Watt Electric Heating Element.
These two heating sources are used in conjunction with an
FDA approved "GRAS" (Generally Recognized as Safe)
propylene glycol based boiler antifreeze and water heating
solution in order to provide a continuous supply of domestic
hot water, interior/fresh water tank heating, independent inte-
rior zone heating.
Please note that all Danger, Warning, Caution, and Note box-
es, appearing as needed throughout this manual, must be
reviewed and adhered to during servicing of the Aqua-Hot in
order to avoid potential hazards which could result in injury,
death, product damage, and/or property damage.
Should additional assistance be needed, please contact the
Technical Support Department at 1-800-685-4298, Monday
through Friday between the hours of 7:00 AM and 4:00 PM
Mountain Standard Time.
®
© 2009 Aqua-Hot
375D Hydronic Heating System Service Manual—Rev. A
G
ENERAL
Danger, Warning, Caution, and Note Box Definitions
Danger, Warning, Caution, and Note boxes appear through-
out this manual as a means of alerting the service technician
to important information.
Indicates that personal injury is likely or imminent
Indicates that serious damage to the heater will occur
and personal injury is possible as well.
Indicates that damage to the heater is possible.
NOTE: Indicates information that requires special
attention by the service technician.
I
:
NFORMATION
— Page 6 —
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