Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 8: DIESEL-BURNER SERVICE, MAINTENANCE, AND REPAIR INFORMATION
General
Recommended
Maintenance
8.1
General Recommended Maintenance
Monthly
Check the Aqua-Hot’s water and antifreeze solution to ensure that it is at the proper level.
Do this by visually checking the coolant level in the Aqua-Hot’s
Expansion Tank
; refer-
ence Figure 1. This should be checked
only
when the
Aqua-Hot
is at maximum operat-
ing temperature (i.e., when the
Diesel-Burner
cycles
OFF
),
“HOT.”
WARNING:
When the
Aqua-Hot
is at maximum operating temperature (
HOT
),
DO NOT
loosen the
Radiator Cap
. If removed, scalding by hot
vapor or coolant could result.
If the coolant needs replenishing, fill the Aqua-Hot’s
Expansion Tank
to the
FULL HOT
level mark. Be sure to reference the Aqua-Hot “Owner’s Manual” for the proper
antifreeze type and mixture. If coolant frequently needs replenishing, please contact the
Technical Support Department at
1-800-685-4298
for assistance.
Annually
WARNING:
Before cleaning or servicing, disconnect all power supplies.
To keep the
Aqua-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 9). To
ensure maximum
Diesel-Burner
performance, always use the recommended
Fuel Nozzle
and
Fuel Filter
(i.e., 10 Micron) when replacing these parts. Reference Section 10 for
spare parts information.
NOTE:
Be sure to use care when handling the
Fuel Nozzle
. Oils and/or small
dust or dirt particles from your hands may plug the nozzle’s small orifice.
A partially plugged orifice will restrict fuel flow, which will affect the
combustion process of the
Diesel-Burner
(i.e., excessive smoking).
CAUTION:
Operating the Aqua-Hot’s
Diesel-Burner
or the
120 VAC Electric
Heating Element
without the water and antifreeze solution will
cause
serious damage
to the heater.
!
!
Fuel Nozzle
(0.35 GPH)
Combustion
Chamber
Fuel Filter
(10 Micron)
small orifice
Figure 9
Page 42
