Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
R
a. Turn the Diesel and Electric switches ON and
allow
the Hydro-Hot to reach maximum
operating temperature (i.e. until the Diesel-
Burner cycles OFF). Locate both the VAC
High-Limit Thermostat and the VAC / VDC
Control Thermostat and check for continuity,
reference
Figure 1.
A: If there is no continuity at the VAC High-
Limit Thermos
tat, 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
VAC 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. 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), it may be that the VDC High-Limit
Thermostat is not operating properly and it may
need
to be replaced.
Q3:
Is VAC power being supplied to the VAC
Element Relay?
WARNING: The following checks
need to be performed with the
motorhome
connected to VAC
power. Be sure to use extreme
caution
when performing each
check,
as 120 VAC power will be
present at each of the electrical
components. Failure to do so may
result
in serious bodily injury (i.e.
electrical shock).
Turn the Electric switch ON. Locate the VAC
Element
Relay in the 4 in. x 4 in. junction box,
reference
Figure 1. Check for AC voltage at
the Black (+) wire ("120 VAC Power Supply")
connection
at the AC Element Relay, refer-
ence
Figure 3. For a common ground, use
the White wire connection at the 120 VAC
Electric
Heating Element. Is voltage present?
A: If YES:
Proceed
to Q4.
If NO:
Check for loose wire connections
at the motorhome's VAC junction
box. If
the wire connections are in
good
condition, please contact our
Technical Department at 1-800-685-
4298
for additional assistance.
Q4:
Is VAC Element Relay functioning prop-
erly?
WARNING: The following checks
need
to be performed with the
motorhome connected to VAC
powe
r. Be sure to use extreme
caution when performing each
check, as 120 VAC power will be
present
at each of the electrical
components. Also, be sure to
disconnect VAC power prior to
replacing
any electrical compo-
nen
ts. Failure to do so may result
in
serious bodily injury (i.e. electri-
cal shoc
k).
NOTE: Inspect the VAC Element Relay for
damage
. If visual signs of damage exist, the
relay must be replaced.
Turn the Electric switch ON. Locate the VAC
Element Relay in the 4 in. x 4 in. junction box.
Check for AC voltage at the Black (+) wire
(from
the VAC High-Limit Thermostat) con-
nection at the AC Element Relay, reference
Figure 3. For a common ground, use the
Section 7: Troubleshooting
Section 7.10,
continue
d
Section 7.10,
continue
d
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