Aqua-Hot AHE-100-02S -12 VDC, Owner'S Manual

Page: 40 / 47

Aqua-Hot™ Hydronic Heating System Shop Manual REV-A 03/02
S SS
SSection 6:
ection 6:
ection 6: ection 6:
ection 6: T T
T T
Trrrrroubleshooting oubleshooting
oubleshooting oubleshooting
oubleshooting
Page 15
1. Turn the Control Switch OFF.
2. Remove the fuel-line from the
Aqua-Hot's
"DIESEL FUEL
RETURN" (see Figure 1) and
place a short piece of fuel line in its
place.
3. Put the opposite end of the fuel
line in a container.
4. Place the probes of a DC-
multi meter into plug locations,
B-1 (+) and B-2 (-), of the Diesel-
Burner's "CONTROL UNIT" (#1),
see Figures 1 and 7. Also,
measure the voltage across B-2 (-)
and B-4 (+).
5. Turn the Control Switch ON.
6. Observe the fuel flow. Flow should
be consistent without air bubbles.
Is the fuel flow
consistent without
air bubbles?
Does the DC-
multi meter
indicate
acceptable
system voltage?
No
No
Yes
Yes
1. Check for fuel leaks in
the
Diesel-Burner's
"DIESEL FUEL
SUPPLY" line, see
Figure 9. Repair if
necessary.
2. Check the Aqua-Hot's
"FUEL FILTER" (see
Figure 8) for clogging.
Replace if necessary.
3. Reattach "DIESEL
FUEL RETURN" line,
see Figure 1.
4. Attempt heater restart.
1. Check the Control
Switch's:
A. wire connections.
B. fuse (E) for
continuity, see Figure
3.
2. Check DC power supply
wires and connections,
see Figure 3.
3. Reattach "DIESEL
FUEL RETURN" line,
see Figure 1.
4. Attempt heater restart.
1. Turn the Control Switch OFF.
2. Reattach "DIESEL FUEL RETURN" line, see Figure 1.
3. Detach the "DIESEL-BURNER HEAD" from the Aqua-Hot,
see Figures 1 and 9.
4. Disconnect one of the wires from the "FUEL SOLENOID
VALVE" (#6), see Figure 13.
NOTE: Do not remove or cut any of the external wires attached
to the "DIESEL-BURNER HEAD".
WARNINGS:
1. DO NOT attempt to restart the Aqua-Hot when the "DIESEL-
BURNER HEAD" is detached. An open flame can result and
cause serious personal injury.
2. To prevent a fire hazard, be sure to disconnect one of the
"FUEL SOLENOID VALVE" (#6) (see Figure 13) wires.
1. Inspect the "FLAME
DETECTION
PHOTOCELL"
(#13) (see Figure 10) for
dust and or sooty carbon
deposits. Clean if necessary.
2. Completely cover the
"FLAME DETECTION
PHOTOCELL" (#13) (see
Figure 10) with a shop rag.
3. Turn the Control Switch ON.
After approx. 20 seconds
of operation a bright blue
arc (spark) should appear
across the "IGNITION
ELECTRODES" (#8), see
Figure 11.
1. Check the voltage level of
the DC-multi meter.
NOTE: Voltage level should be
within 0.5 volts of the system's
DC battery voltage.
!