AHE-02S Web Format REV-A 03-02 - Aqua
Shop Manual
Model Numbers
AHE-100-02S - 12 VDC
AHE-200-02S - 24 VDC
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
TABLE OF C
ONTENT
S
CONTENT
ONTENTS
Sections
1
2
3
4
Aqua-Hot Information
1.1
Aqua-Hot Component Overview
1.2
Aqua-Hot Identification Plate
Aqua-Hot Wiring Information
2.1
Wiring Diagram
2.2
Control / High-Limit Thermostat Wiring
Diesel-Burner Information
3.1
Diesel-Burner Component Overview
3.2
Operational Flow-Chart
3.3
Diesel-Burner Identification Plate
Diesel-Burner Wiring Information
4.1
5
6
Control Unit Wiring
Diesel-Burner Service, Maintenance, and Repair
Information
5.1
General Maintenance
5.2
Detaching the Diesel-Burner Head
5.3
Flame Detection Photocell
5.4
Ignition Electrodes
5.5
Fuel Nozzle
5.6
Fuel Solenoid Valve
5.7
Fuel Pump
Troubleshooting
6.1
Troubleshooting Flow-Chart
7
Aqua-Hot Warranty Information
8
Parts List
9
Special Tools
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 1: Aqua-Hot Information
Overview
1.1
Aqua-Hot Component Overview
Ho
t
Expansion
Tank
Zone # A
Supply
Co
ld
Zone # A
Return
Zone # B
Return
Zone # B
Supply
Fill / Radiator
Cap
Thermostat
Access Panel
Zone # C
Return
VAC Service
Input
Zone # C
Supply
VAC Access
Panel
Zone
Circulation
Pump
Fuse Block
Engine Preheat
Circulation
Pump
I.D Plates
Zone Relay #A
Diesel-Burner
Head
Zone Relay #B
Engine Coolant
Supply
Zone Relay #C
Electric Heating
Element Access
Panel
Diesel Fuel
Supply
Diesel Fuel
Return
Engine
Coolant
Return
Diesel-Burner
Control
Unit
Mixer
Valve
Pressure-Relief
Cold Water
Valve
Inlet
Hot Water
(Domestic Water)
Outlet
(Domestic Water)
Figure 1
Page 1
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 1: Aqua-Hot Information
Aqua-Hot
I.D. Plate
1.2
Aqua-Hot Identification Plate
MODEL No.
AHE-100-02S
SERIAL No.
02-637
Install in strict compliance with local codes, NFPA
501c and manufacturer's instructions. For installation
only in compartment completely closed off from living
quarters and accessible only from the outdoors.
Exhaust pipe must not terminate beneath the vehicle.
Caution! Do not adjust the Heater's
Tempering Valve. Tampering with the
Tempering Valve can increase the risk of
scald injury.
Use copper electrical conductors only. Approved for
use in recreational vehicles and in marine applications.
Complies with the requirements of
UL 307A and (USCG) CFR33.
The I.D. Plate is located
on the right sidewall
of heating unit, directly
below the VAC Access
Panel, see Figure 1.
Serial Number
Box
Model Number
Box
12 VDC/110 VAC 1650 W
Fuel: Diesel 1 or 2
Firing rate: 50,000 btu/hr
patent No. 5,025,985 and 5,067,652
Listing No.
PO BOX 7025 SALT LAKE CITY, UTAH 84157
15717
MODEL No.
AHE-100-02S
SERIAL No.
02-637
The lower portion of the
I.D. Plate is located
inside the heating unit
to the right of the Electric
Heating Element Access
Panel, see Figure 1.
Serial Number
Box
Model Number
Box
Figure 2
Page 2
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 2: A
qua-H
ot Wiring IInfor
nfor
mation
Aqua-H
qua-Hot
nformation
Wiring
Diagram
2.1
Wiring Diagram
Brown
Key
Indicator Light
) Indicates Field
Wiring
(-)
(+)
(
Control Switch
Living Room
Thermostat ( - )
Wiring Diagram
(-)
TSTAT
(+)
TSTAT
Bathroom
Thermostat ( - )
Chassis Ground
(B) (A)
TSTAT
Bedroom
Thermostat ( - )
Engine Preheat
Switch ( - )
Zones
(C)
Green
Living Room
Pump
A-Zone
Red
Green
Blue
White
Brown
Bathroom
Pump
Fresh Water
Tank / Bay
Pump
B-Zone
Blue
Red
Green
Power Post
(+) Battery Connection
Blue
10A
15A
B-1
B-4
Bathroom
(B-Zone ) Cozy
Heat Exchanger
(+)
Bedroom
(C-Zone ) Cozy
Heat Exchanger
+
+
+
6
+
4
+
+
+
6
+
4
+
+
+
6
+
+
A-Zone
Relay
+
+
+
+
+
B-Zone
Relay
C-Zone
Relay
+
+
+
+
+
+
+
+
+
+
B-6
(+)
4
Red
B-3
10A
Fans
Brown
Figure 3
B-2
Diesel-Burner
C-Plug (8 Pin)
(+)
(-)
B-1
Living Room
(A-Zone ) Cozy
Heat Exchanger
(-)
Pumps
F
Red
Black
Black
White
(+)
(-)
+
E
Yellow
Engine
Pump
(-)
+
D
B-4
Ground Post
(-) Battery
Connection
C
OPEN
C-Zone
B
10A
A
10A
Bedroom
Pump
Fresh Water Tank
/ Bay Whisper
Heat Exchanger
Diesel-Burner
B-Plug (6 Pin)
C-2
Orange
Blue
TSTAT
Black
Fresh Water Tank
/ Bay Thermostat
(B-Zone )
For Technical Support call 1-800-685-4298
Page 3
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 2: A
qua-H
ot Wiring IInfor
nfor
mation
Aqua-H
qua-Hot
nformation
Control /
High-Limit
Thermostat
Wiring
2.2
Control / High-Limit Thermostat Wiring
Orange Wire
Blue Wire
VAC High-Limit
Thermostat,
230˚ F White Dot
12-2 ROMEX
Cable w/ground
Green Wire
(Ground)
VAC Service
Input /
ROMEX Clamp
"COMMON"
White Wire to
White ROMEX Wire
Black Wire
VDC Control
Thermostat,
190˚F, Blue Dot
Thermostat Thermostat
Thermostat
Thermostat Thermostat
Thermostat
Thermostat Thermostat
Thermostat
RED
110
Element
Ground
Post
Thermostat Thermostat
Thermostat
Black Wire
VDC High-Limit
Thermostat,
230˚F, Black
Aqua-Hot
Junction Box
VAC Control
Thermostat,
198˚F, Red Dot
"GROUND"
Green Wire to
ROMEX Copper Wire
White Wire
Black Wire
Purple Wire
"120 VAC POWER SUPPLY"
Black ROMEX Wire to
"LOAD" Black Wire
White Wire
120 VAC / 1650 Watt
Electric Heating Element
Figure 4
Page 4
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 3: Diesel-Burner Information
Overview
1.
2.
3.
4.
5.
6.
7.
8.
9.
Control Unit
Motor
Ignition Coil
Clutch
Combustion Air Fan
Fuel Solenoid Valve
Electrode Holder
Ignition Electrodes
Fuel Nozzle
3.1
Diesel-Burner Component Overview
10.
11.
12.
13.
14.
15.
16.
Combustion Chamber
Heat Exchanger
Exhaust Port
Flame Detection Photocell
Fuel Pump
Fuel Ports (Supply / Return)
Combustion Air Port (Intake)
with Adjustable Shutter
Figure 5
Page 5
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 3: Diesel-Burner Information
DieselBurner
Operational
Flow-Chart
Operation sequence once the
Aqua-Hot's Diesel-Burner
Control Switch is turned ON.
3.2
Operational Flow-Chart
~ Reference Figure 5 for all numbers indicated inside parenthesis. (i.e #8).
Simultaneously the
"IGNITION COIL" (#3)
produces a High Voltage
Spark across the "IGNITION
ELECTRODES" (#8) which
ignites the incoming Air / Fuel
The Control Switch's indicator
light will illuminate.
The "MOTOR" (#2) (which
turns the "COMBUSTION AIR
FAN" (#5) and drives the
"FUEL PUMP" (#14)) will
begin to run.
NOTE:
Once the ignited Air / Fuel
mixture (FLAME) is observed
by the "FLAME DETECTION
PHOTOCELL" (#13), the
"IGNITION COIL" (#3) will
automatically switch OFF. The
combustion process now
continues to operate
unassisted.
NOTE:
If the Aqua-Hot's Coolant
reservoir temperature is
approximately 175 degrees
Fahrenheit, or higher, the
"MOTOR" (#2) will not operate.
Only when the temperature has
dropped below 175 degrees
Fahrenheit will the "VDC
CONTROL THERMOSTAT"
(see Figure 4) allow the
"MOTOR" (#2) to operate.
The "MOTOR" (#2) will
continue to run for
approximately three (3)
additional minutes. This is
called the "Purge-Cycle",
which cools down the Heater's
internal components and
purges the "COMBUSTION
CHAMBER" (#10) of any
residual exhaust gases.
The combustion process will
continue to operate in this
manner until:
When the Aqua-Hot DieselBurner is switched OFF by the
"VDC CONTROL
THERMOSTAT" (see Figure 4):
A.) The "MOTOR" (#2) will
shut-off once the three (3)
minute "Purge-Cycle" has
expired.
B.) The Aqua-Hot's DieselBurner will automatically turn
back ON once the coolant
temp. reaches the preset
temperature of approximately
175 degrees Fahrenheit.
A.) The "VDC CONTROL
THERMOSTAT", (see Figure 4)
(which senses Coolant Temp.),
reaches the preset temperature
of approximately 190 degrees
Fahrenheit.
B.) The Aqua-Hot's DieselBurner Control Switch is turned
OFF.
After approximately 10 - 25
seconds the "FUEL
SOLENOID VALVE" (#6)
opens and fuel is sprayed
into the "COMBUSTION
CHAMBER" (#10) through
the "FUEL NOZZLE" (#9).
Once the Heater switches
OFF, thermostatically or
manually, the "FUEL
SOLENOID VALVE" (#6)
closes, which interrupts the
supply of diesel fuel to the
"FUEL NOZZLE" (#9).
SUMMARY:
The Aqua-Hot's Diesel-Burner is
operational anytime the operator
activates the Diesel-Burner
Control Switch to the ON
position. The Diesel-Burner will
then automatically maintain the
temperature of the coolant
without any additional
involvement from the operator.
Page 6
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 3: Diesel-Burner Information
Diesel
Burner
I.D. Plate
3.3
Diesel-Burner Identification Plate
Fabrikschild-Duplikat
gultig nur zusammen mit Original
Thermosysteme GmbH
MADE IN GERMANY
DBW 2010.75
HEIZGERAT Typ
Spannung / El. Leistung
12 V / 60W
13,2 kW
Warmestrom
Brennstoff
Diesel
zul. Betriebsuberdruck
2 bar
Prufzeichen
Fabriknummer
1B230410
Inbetriebnahmejahr
2001 2002 2003
Model Type
Voltage / Wattage
Fuel Type
Serial Number (230410)
Diesel-Burner I.D. Plate
is located on the left side
of the Diesel-Burner Head
Diesel-Burner
Head
Figure 6
Page 7
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 4: D
iesel-B
ur
ner Wiring IInfor
nfor
mation
Diesel-B
iesel-Bur
urner
nformation
Control
Unit Wiring
4.1
Control Unit Wiring
( + ) VDC Control Thermostat (Orange)
( + ) Blower Motor (Black)
( - ) To Overheat Circuit
And Solenoid Valve (Blue)
( + ) Indicator Light (Blue)
( - ) Battery (Brown)
( + ) On / Off Switch With
Low Voltage Protection
(White)
B-Plug
1
4
2
5
3
6
1
5
2
6
7
4
8
C-Plug
( + ) To Ignition Coil (Yellow)
( + ) Battery (Red)
( - ) Indicator Light (Green)
( + ) From Normally Closed
VDC Control Thermostat (White)
( + ) Flame Detector (Green)
( - ) For All Heater Components (Brown)
Figure 7
Page 8
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 5: Diesel-Burner Service, Maintenance, and Repair Information
Upkeep
5.1
General Maintenance
Monthly
Check the Aqua-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 Aqua-Hot's Expansion Tank, see Figure 1. This should be checked
only when the Aqua-Hot is at full operating temperature, “HOT.”
Annually
CAUTION: Before cleaning or servicing, disconnect all power
supplies.
It is ideal to have your Aqua-Hot tuned-up yearly. A tune-up should
consist of a Fuel Nozzle and Fuel Filter replacement and a thorough
cleaning of the Combustion Chamber, if necessary, see Figure 8. This
simple tune-up will keep your Aqua-Hot running smoothly throughout
the year. This annual tune-up will also allow service personnel to
inspect for wear and tear of other components.
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
Fuel Filter
Combustion
Chamber
Figure 8
Page 9
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 5: D
iesel-B
ur
ner SSer
er
vice, M
aintenance, and R
epair IInfor
nfor
mation
Diesel-B
iesel-Bur
urner
ervice,
Maintenance,
Repair
nformation
Detaching
Diesel-Burner
Head
5.2
Detaching the Diesel-Burner Head
Grommets
Eye-Bolts
and Nuts
Blower
Casing
Figure 9
Diesel
Fuel Supply
Diesel
Fuel Return
Instructions For Detaching the Diesel-Burner Head from the Aqua-Hot
CAUTION: Before detaching the Diesel-Burner Head, disconnect all
power supplies.
1. Loosen the two Eye-Bolt Nuts and swing the Eye-Bolts out of the way.
2.
With both hands, carefully pull the Diesel-Burner away from the AquaHot, approximately 4-5 inches. Please note that you may have to lift the
head slightly while pulling it away from the Aqua-Hot.
3. Rotate the head approximately 90 angular degrees to the right or until all
the internal components are visible.
NOTE: It may be necessary to disconnect the two RED wires, which
are connected to pin #6 of the B-Zone relay, when rotating the head
beyond 90 degrees, see Figure 3.
CAUTION: When reattaching the Diesel-Burner Head to the Aqua-Hot,
be sure to properly align the head and DO NOT over tighten the Eye-Bolt
Nuts. An improper alignment and or an over tightening of the Eye-Bolt
Nuts can cause damage to the Diesel-Burner Head's aluminum-cast
housing (Blower Casing), see Figure 9.
Page 10
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 5: D
iesel-B
ur
ner SSer
er
vice, M
aintenance, and R
epair IInfor
nfor
mation
Diesel-B
iesel-Bur
urner
ervice,
Maintenance,
Repair
nformation
Flame
Detection
Photocell
5.3
Flame Detection Photocell
Flame Detection
Photocell
Photo Disc
Green Wire
Flame Detection Photocell
Cleaning Notes
Figure 10
Ignition
Electrodes
5.4
For light dirt, dust and carbon deposits
simply wipe off the Flame Detection
Photocell with a soft cloth. Should
heavy carbon deposits be present,
completely remove the Flame Detection Photocell from the Photo Disc and
clean with carburetor cleaner.
Blue Wire
Ignition Electrodes
Note: Electrode Adjustment
Gauge is located on the
outside surface of the DieselBurner on the lefthand side.
Electrode Adjustment Gauge
Note: Once adjustment is
complete, remove Electrode
Adjustment Gauge and reattach to Diesel-Burner.
Ignition Electrodes
Figure 11
Adjustment gauge properly positioned
Page 11
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 5: D
iesel-B
ur
ner SSer
er
vice, M
aintenance, and R
epair IInfor
nfor
mation
Diesel-B
iesel-Bur
urner
ervice,
Maintenance,
Repair
nformation
Fuel
Nozzle
5.5
Fuel Nozzle
Fuel Nozzle
Fuel Nozzle
Stand
Figure 12
Solenoid
Valve
5.6
Note: When replacing the Fuel
Nozzle, be sure to tighten the Nozzle,
then loosen 1/4 turn and firmly
retighten. This will establish a seated
fit and avoid any leaks.
Fuel Solenoid Valve
Electrical Terminals
(+) (-)
Fuel Solenoid Valve
Fuel Solenoid
Kit
Figure 13
Page 12
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 5: D
iesel-B
ur
ner SSer
er
vice, M
aintenance, and R
epair IInfor
nfor
mation
Diesel-B
iesel-Bur
urner
ervice,
Maintenance,
Repair
nformation
Fuel
Pump
5.7
Fuel Pump
Fuel Pump
Pressure
Regulation
(Adjustment)
Note: Adjust fuel pressure to
145 PSI.
(+) Clockwise rotation
increases fuel pressure.
(-) Counter Clockwise rotation
decreases fuel pressure.
Fuel Pressure Gauge
Note: Fuel Pressure gauge
replaces the Fuel Nozzle when
adjusting fuel pressure.
Figure 14
Page 13
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 6: Troubleshooting
Troubleshooting
Flow-Chart
6.1
1. Check indicator light bulb.
Replace if necessary.
Troubleshooting Flow-Chart
2. Remove the Aqua-Hot's
ACCESS COVER.
Is the indicator
light illuminated?
Turn the Control
Switch ON.
No
3. Check Aqua-Hot fuses
(E & F) for continuity, see
Figure 3. Replace if necessary.
4. Check DC power supply at the
"POWER POST" and
"GROUND POST", see Figure
3.
Yes
5. Attempt heater restart.
1. Remove the AquaHot's ACCESS
COVER.
No
2. Check Aqua-Hot
fuse (F) for
continuity, see
Figure 3. Replace if
necessary.
Is the DieselBurner's
"MOTOR" (#2)
operating?
1. Remove the Aqua-Hot's
ACCESS COVER.
Yes
2. Remove the "THERMOSTAT
ACCESS PANEL", see Figure
1.
3. Check the Diesel-Burner's
"VDC HIGH-LIMIT
THERMOSTAT" for continuity,
see Figure 4.
NOTE: The indicator
light will illuminate for
only 30 seconds if fuse
(F) is blown (open
circuit).
NOTE: This Thermostat protects
against overheating temperatures.
3. Attempt heater
restart.
Check the DieselBurner's
"VDC CONTROL
THERMOSTAT" (blue
dot) for continuity, see
Figure 4.
1. Replace
Thermostat.
NOTE: Aqua-Hot
operating temperature
must be below 170
degrees Fahrenheit
when checking the
"VDC CONTROL
THERMOSTAT"
for continuity, see
Figure 4.
2. Attempt heater
restart
Is there continuity
across the
Thermostat?
Yes
No
No
Is there continuity
across the
Thermostat?
1. Replace the Thermostat.
2. Attempt heater restart.
Yes
Page 14
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 6: Troubleshooting
1. Check for fuel leaks in
the Diesel-Burner's
"DIESEL FUEL
SUPPLY" line, see
Figure 9. Repair if
necessary.
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.
Is the fuel flow
consistent without
air bubbles?
No
3. Put the opposite end of the fuel
line in a container.
3. Reattach "DIESEL
FUEL RETURN" line,
see Figure 1.
4. Place the probes of a DCmulti meter into plug locations,
B-1 (+) and B-2 (-), of the DieselBurner's "CONTROL UNIT" (#1),
see Figures 1 and 7. Also,
measure the voltage across B-2 (-)
and B-4 (+).
4. Attempt heater restart.
Yes
1. Check the Control
Switch's:
5. Turn the Control Switch ON.
A. wire connections.
B. fuse (E) for
continuity, see Figure
3.
6. Observe the fuel flow. Flow should
be consistent without air bubbles.
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.
Does the DCmulti meter
indicate
acceptable
system voltage?
No
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.
2. Check DC power supply
wires and connections,
see Figure 3.
3. Reattach "DIESEL
FUEL RETURN" line,
see Figure 1.
Yes
1. Inspect the "FLAME
DETECTION PHOTOCELL"
(#13) (see Figure 10) for
dust and or sooty carbon
deposits. Clean if necessary.
2. Check the Aqua-Hot's
"FUEL FILTER" (see
Figure 8) for clogging.
Replace if necessary.
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 "DIESELBURNER 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.
Page 15
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 6: Troubleshooting
Does a spark
appear across the
Ignition
Electrodes?
Within 15 seconds, after turning ON
the Control Switch, disconnect one
of the two wires from the "FLAME
DETECTION PHOTOCELL" (#13)
(blue or green), see Figure 10. A
spark should now appear across
the "IGNITION ELECTRODES"
(#8), see Figure 11.
No
Yes
Does a spark
appear across the
Ignition
Electrodes?
Yes
Remove shop rag from the "FLAME
DETECTION PHOTOCELL" (#13)
(see Figure 10), exposing it to a light
source. The spark should disappear.
No
Does a spark
disappear after the
Photocell is exposed
to light?
1. Replace "FLAME DETECTION
PHOTOCELL" (#13), see
Figure 10.
2. Reconnect "FUEL SOLENOID
VALVE" (#6) (see Figure 13)
wire.
Yes
3. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and
attempt heater restart.
2. Check "FLAME DETECTION
PHOTOCELL" (#13) (See Figure 10)
for proper operation by: Removing
both wires from the Photocell and
covering with a shop rag. When dark,
Photocell wire leads should read
300,000 ohms, or greater, of electrical
resistance. Remove shop rag and
expose to light; electrical resistance
should be 300 ohms or less.
No
1. Turn the Control Switch
OFF.
2. Check "IGNITION COIL"
(#3) for proper operation
by: Removing C-plug from
"CONTROL UNIT" (#1),
see Figure 7. Apply DC
power (+) to C-8 plug
(yellow wire) and ground
(-) to C-5 plug (brown
wire). A spark should now
appear across the
"IGNITION ELECTRODES"
(#8), see Figure 11.
Does the Photocell
operate properly?
Yes
Does the Ignition
Coil operate
properly?
1. Replace "CONTROL UNIT" (#1), see
Figure 7.
2. Reconnect "FLAME DETECTION
PHOTOCELL" (#13) (see Figure 10)
wires and "FUEL SOLENOID VALVE"
(#6) (see Figure 13) wire.
Cover "FLAME DETECTION
PHOTOCELL" (#13) (see
Figure 10) again with a shop
rag. The spark should
reappear and continue for
approx. 15 seconds and then
switch off.
No
1. Turn the control switch OFF.
No
Yes
3. Reattach "DIESEL-BURNER HEAD"
(see Figure 9) and attempt heater
restart.
1. Replace "CONTROL UNIT" (#1), see
Figure 7.
2. Reconnect "FLAME DETECTION
PHOTOCELL" (#13) (see Figure 10)
wires, "FUEL SOLENOID VALVE"
(#6) (see Figure 13) wire and C-plug.
1. Replace "IGNITION COIL"
(#3).
2. Reconnect "FLAME
DETECTION PHOTOCELL"
(#13) (see Figure 10) wire,
"FUEL SOLENOID VALVE"
(#6) (see Figure 13) wire and
C-plug.
3. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and
attempt heater restart.
3. Reattach "DIESEL-BURNER HEAD"
(see Figure 9) and attempt heater
restart.
Aqua-Hot™ Hydronic Heating System Shop Manual
Page 16
REV-A 03/02
Section 6: Troubleshooting
1. Turn the Control Switch OFF.
2. Reconnect "FUEL SOLENOID VALVE" (#6) (see Figure 13) wire.
Does the spark
reappear?
Yes
3. Remove both ignition wires from the "IGNITION ELECTRODES" (#8)
see Figure 11) or connect a jumper wire across the Electrodes.
!
No
1. Turn the Control Switch OFF.
2. Replace "CONTROL UNIT" (#1),
see Figure 7.
CAUTION: To prevent a HIGH VOLTAGE shock and or a fire
hazard, be sure to remove both "IGNITION ELECTRODES" (#8)
(see Figure 11) (tape the ends and separate the wires) or connect a
jumper wire across the Electrodes.
4. Turn the Control Switch ON. After approx. 20 seconds the "FUEL
SOLENOID VALVE" (#6) (see Figure 13) should receive power from the
"CONTROL UNIT" (#1), see Figure 7. A fine mist of fuel should appear
from the "FUEL NOZZLE" (#9), see Figure 12.
3. Reconnect "FUEL SOLENOID
VALVE" (#6) (see Figure 13) wire.
4. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and attempt
heater restart.
Is a mist of fuel
(cone-shaped)
present?
1. Replace "FUEL SOLENOID VALVE" (#6),
see Figure 13.
Yes
No
2. Retest fuel flow (without Fuel Nozzle).
3. Install "FUEL NOZZLE" (#9), see Figure 12.
1. Turn the Control Switch OFF.
4. Retest Fuel Nozzle spray pattern (fine mist of
fuel present?).
5. Reconnect ignition wires to "IGNITION
ELECTRODES" (#8) (see Figure 11) or
remove jumper wire.
6. Reattach "DIESEL-BURNER HEAD" (see
Figure 9) and attempt heater restart.
2. Reconnect ignition wires to
"IGNITION ELECTRODES"
(#8) (see Figure 11) or
remove jumper wire.
3. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and
attempt heater restart.
1. Turn the Control Switch
OFF.
2. Remove "FUEL NOZZLE"
(#9), see Figure 12.
3. Turn the Control Switch ON.
After approx. 20 seconds
fuel should flow freely from
the fuel nozzle port.
No
1. Turn the Control Switch OFF.
No
Does the
Solenoid Valve
operate properly
(click)?
Yes
2. Check "FUEL SOLENOID VALVE"
(#6) (see Figure 13) for proper
operation by: Removing both wires
from the Solenoid Valve and
applying VDC power (+) and
ground(-) to the Solenoid Valve
electrical terminals. "FUEL
SOLENOID VALVE" (#6) (see
Figure 13) should click when VDC
power is applied.
Page 17
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
No
Does fuel flow
freely from the
port?
Yes
Section 6: Troubleshooting
1. Check "FUEL SOLENOID VALVE"
(#6) (see Figure 13) wires for
continuity. Replace wires if
necessary.
1. Turn the Control Switch OFF.
2. Replace "CONTROL UNIT" (#1)
(see Figure 7) if wires indicate
continuity.
3. Retest Fuel Nozzle spray pattern
(fine mist of fuel present?).
3. Retest fuel flow (without Fuel
Nozzle).
4. Install "FUEL NOZZLE" (#9),
see Figure 12.
5. Retest Fuel Nozzle spray pattern
(fine mist of fuel present?).
2. Replace "FUEL NOZZLE" (#9),
see Figure 12.
4. Reconnect ignition wires to
"IGNITION ELECTRODES" (#8)
(see Figure 11) or remove jumper
wire.
5. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and attempt
heater restart.
7. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and attempt
heater restart.
NOTE: If an improper fuel spray is still observed (a normal spray
pattern should be observed as a coned-shaped mist) the DieselBurner's "FUEL PUMP" (#14) (see Figure 14) should be
calibrated for the proper fuel pressure setting.
End of Troubleshooting FlowChart.
For additional troubleshooting
information please contact:
Vehicle System's Service Dept.
at 303-857-2901
Page 18
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 7: A
qua-H
ot Warranty IInfor
nfor
mation
Aqua-H
qua-Hot
nformation
WARRANTY POLICY
- FOR AQUA-HOT MODELS Vehicle Systems Inc. warrants the AQUA-HOT Heater, to the original owner, to be free from
defects in material and workmanship under design usage and service conditions for a period of
two (2) years on parts and labor beginning on the date of purchase of the vehicle. Replacement
parts are covered for the remainder of the heating system's warranty or for six months (180
days) whichever is greater.
This warranty does not apply to damage or failure of the AQUA-HOT Heater or the vehicle
into which it was installed due to improper installation, assembly, maintenance, abuse,
neglect, accident, or the use of parts not supplied by Vehicle Systems Inc. Vehicle Systems is not responsible for incidental or consequential damages.
The intent of this warranty is to protect the end user of the heating system from such defects
which would occur in the manufacture of the product. The warranty is not intended to protect the
end user from problems which are outside the ability of Vehicle Systems’ control.
To obtain warranty repair authorization or for additional information, please contact our Technical
Support Department at 1-800-685-4298 (8 AM to 5 PM) Mountain Standard Time.
Page 19
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Section 8: P
ar
ts List
Par
arts
Control Unit
91
90
1
2
1 2 3
4 5 6
A
B
12 4
5678
125
126
C
97
99
2
72
100
59
98
62
50
61
51
56
5
27
2
WPX-287-962
Control Unit, 12 VDC, DBW 2010-300, AH/HH/WH
2*
WPX-306-07B
Control Unit, 24 VDC, DBW 2010-300, AH/HH/WH
5
WPX-101-838
Coil, Ignition, 12 VDC, DBW 2010-300, AH/HH/WH
5*
WPX-101-846
Coil, Ignition, 24 VDC, DBW 2010-300, AH/HH/WH
27
WPX-425-060
Motor, Combustion Air/Fuel Pump, 12 VDC, DBW-2010, AH/HH/WH
27*
WPX-425-079
Motor, Combustion Air/Fuel Pump, 24 VDC, DBW-2010, AH/HH/WH
50
WPX-322-083
Valve, Fuel Solenoid, 12 VDC, DBW 2010-300, AH/HH/WH
50*
WPX-322-091
Valve, Fuel Solenoid, 24 VDC, DBW 2010-300, AH/HH/WH
51
WPX-386-650
Valve, Kit, Fuel Solenoid, DBW 2010-300, AH/HH/WH
56
WPX-274-313
Electrode, Ignition, DBW-2010, AH/HH/WH
59
WPX-638-78A
Sensor, Flame, DBW 2010-300, AH/HH/WH
61
WPX-887-71A
Photo Disc, DBW-2010, AH/HH/WH
62
WPX-886-41A
Nozzle, Fuel, .35 GPH, DBW-2010, AH/HH/WH
72
WPX-502-05A
Pump, Fuel, 10 Bar, DBW 2010-300, AH/HH/WH
90
WPX-265-53A
Combustion Chamber, DBW-2010, AH/HH/WH
91
WPE-905-83A
Burnerhead, Modified, VSI DBW-2010, 12 VDC, AH
91*
WPE-905-84A
Burnerhead, Modified, VSI DBW-2010, 24 VDC, AH
97
ELE-L08-190
Thermostat, VDC Control, 190° F, Blue Dot, AH
98
ELE-L08-230
Thermostat, VDC High-Limit, 230° F, Black, AH
99
ELE-254-010
Thermostat, VAC High-Limit, 230° F, White Dot, AH
100
ELE-010-198
Thermostat, VAC Control, 198° F, Red Dot, AH
125
FLX-120-VS1
Filter, Fuel, System, 10 Micron, AH/HH
126
FLX-R12-TRA
Filter, Fuel, Spin-On Element, 10 Micron, AH/HH
* Asterick denotes 24 volt model
Aqua-Hot™ Hydronic Heating System Shop Manual
Page 20
REV-A 03/02
Section 9: SSpecial
pecial Tools
102
140
139
138
102
WPX-310-646
Gauge, Adjustment, Electrode, DBW 2010-300, AH/HH/WH
138
WPX-440-280
Control Box, Tester, DBW 2010-300, AH/HH/WH
139
WPE-600-190
Gauge Kit, Fuel Pressure, DBW 2010-300, AH/HH/WH
140
****************
Tester, CO-2, DBW 2010-300, AH/HH/WH
Order item #140 from a Grainger Industrial Supply Store near you
or visit the Grainger website at www.grainger.com.
(Grainger Part# 6T153)
Page 21
Aqua-Hot™ Hydronic Heating System Shop Manual
REV-A 03/02
Motor Coach Heating Specialists · Manufacturers and Distributors
15549 East Highway 52 • Fort Lupton, Colorado 80621 • 1-800-685-4298 • Fax: 303-857-9000
 Copyright 2002 Vehicle Systems, Inc. All rights reserved
www.aqua-hot.com
LTE-LMA-004
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