Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
R
a. Turn the Diesel switch ON and allow the
Hydro-Hot
to reach operating temperature
(i.e. until the Diesel-Burner cycles OFF).
Locate
both the VDC High-Limit Thermostat
and the VAC / VDC Control Thermostat and
check them for continuity, reference Figure 1.
A: If there is no continuity at the VDC High-
Limit Thermostat, but there is continuity at
th
e VAC / VDC Control Thermostat:
Th
e VAC / VDC Control Thermostat
must be replaced. Please contact
our Technical Department at 1-800-
685-4298
for assistance.
If there is continuity at the VDC High-Limit
Thermostat, but none at the VAC / VDC
Control
Thermostat:
The overheat condition may have
been caused by another faulty
component and no further trouble-
shooting is necessary, see the
"NOTE"
below and please contact
our Technical Department at 1-800-
685-4298 for additional assistance.
NOTE: If the VDC High-Limit Thermostat
continues to trip, and no overheating problems
were
discovered (i.e. faulty VAC / VDC Control
Thermostat or Control Unit), it may be that the
VDC
High-Limit Thermostat is not operating
properly and it may need to be replaced.
Q2:
Is the Diesel-Burner's Fuel Nozzle func-
tioning properly?
In order to determine if the Fuel Nozzle
is
functioning properly, reference Section 8.6
and perform the Fuel Nozzle's "Component
Test".
A: If the Fuel Nozzle is not functioning
properly:
Th
e Fuel Nozzle must be replaced,
reference Section 8.6 for replace-
ment
instructions.
If the Fuel Nozzle is functioning properly:
Continue Troubleshooting.
After turning the Diesel switch ON:
TS2: The Hydro-Hot's Diesel-Burner operates
(3-minute prime cycle only), but does
not ignite.
NOTES:
A. It is ideal to have the Hydro-Hot's Fuel Filter
replaced yearly, reference Section 8.1. A
plugged Fuel Filter will not allow the Diesel-
Burner to operate properly. Also, before
proceeding on to the following procedures,
be sure to check that the vehicle's fuel
tank has a sufficient level of fuel.
B. In order to perform some of the following
procedures it may be necessary to detach
the Diesel-Burner Head from the Hydro-Hot.
Therefore, be sure to reference Section 8.2
for detaching and reattaching instructions.
Q1: Has the Hydro-Hot's VDC High-Limit Ther-
mostat tripped?
Loca
te the VDC High-Limit Thermostat and
check for continuity, reference Figure 1. Is
continuity
present?
A: If YES:
Proceed to Q2.
If NO:
Press
the red reset button located on
the VDC High-Limit Thermostat and
attempt heater restart.
NOTE: Although
the Diesel-Burner is now
functioning, be sure to perform the following
ste
ps until the cause for overheating has been
discovered and corrected. Failure to do so
could result in another overheating condition.
Section 7: Troubleshooting
Section 7.2
Section 7.1,
continue
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Page 19
NOTE: If the Hydro-Hot still does not operate
after performing all of the listed checks, contact
our Technical Department at 1-800-685-4298 for
additional assistance.
Section 7.2,
continue
d