Hydro-Hot Hydronic Heating System Owner’s Manual 08/04
®
SECTION 3: MAINTENANCE
Upkeep
3.1 Maintenance Schedule
Monthly
Check the Hydro-Hot's solution of water and antifreeze to ensure that it
is at the proper level. Do this by visually checking the coolant level in
the Hydro-Hot's Expansion Tank, reference
Figure 1A
. Please note that
the coolant level should be checked
only
when the Hydro-Hot is at
maximum operating temperature (i.e. when the Diesel-Burner cycles
OFF
),
“HOT.”
WARNING:
When the Hydro-Hot is at maximum operating temperature
(
HOT
),
DO NOT
loosen the Radiator Cap. If removed, scalding by hot
vapor or coolant could result.
NOTE:
This Hydro-Hot product utilizes a Propylene Glycol (P.G.) based
water and antifreeze solution. This P.G. based solution is a Boiler type
antifreeze, which is Generally Recognized as Safe (“GRAS”) by the FDA.
For additional information regarding this GRAS antifreeze product, please
contact us at 1-800-685-4298 or visit our website at
www.vehiclesys.com
.
If the coolant needs replenishing, fill the Hydro-Hot’s Expansion Tank to the
FULL HOT
level mark. Be sure to use a 50/50 mixture of water and (P.G.)
antifreeze.
Annually
WARNING:
Before cleaning or servicing, disconnect all power supplies.
To keep your Hydro-Hot running smoothly, it is ideal to have the Diesel-Burner
tuned-up annually. A tune-up should consist of a new Fuel Nozzle and Fuel
Filter, along with a thorough cleaning of the Combustion Chamber, if
necessary (reference
Figure 4
). To ensure maximum Diesel-Burner
performance, always use the recommended Fuel Nozzle (i.e. 0.35 GPH) and
Fuel Filter (i.e. 10 Micron) when replacing these parts. Reference the Hydro-
Hot “Parts Manual” for spare parts information. If detailed replacement
instructions are needed, please reference the Hydro-Hot “Shop Manual” for
your specific model of Hydro-Hot, or contact our Technical Department at 1-
800-685-4298 for the nearest Hydro-Hot Service Center.
CAUTION
:
DO NOT
operate the Diesel-Burner and/or the Electric Heating
Element without the water and antifreeze solution in the Hydro-Hot’s Boiler Tank.
Failure to do so will cause
serious damage
to the Heater.
Fuel Nozzle
(0.35 GPH)
Combustion
Chamber
Fuel Filter
(10 Micron)
Figure 4
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