Airxcel Aqua-Hot Reporter 400 Series User manual

Installation Manual
400Series
AHE-450-DE5
with

Introduction
©Aqua-Hot® 450D Installation Manual REV 220504 p. 1
Contents
Caution Notes...............................................................................1
Introduction ..................................................................................2
System Features ..........................................................................4
Component Cut-Aways .................................................................5
Installing the Aqua-Hot ................................................................7
Support & Clearances..................................................................8
Installation of the Expansion Tank..............................................9
Exhaust System..........................................................................10
Installing the Heat Exchangers ................................................ 13
Mounting the Heat Exchangers.................................................15
Wiring the Heat Exchangers ......................................................16
Plumbing the Heating Loop.......................................................17
Heat Exchangers Layout............................................................19
Engine Preheat.......................................................................... 20
Diesel Fuel System.................................................................... 22
Domestic Water System Requirements................................... 25
Plumbing the Domestic Water System .................................... 26
Thermostats ...............................................................................27
Switch Panel.............................................................................. 28
Wiring the Aqua-Hot .................................................................. 30
Aqua-Hot Reporter..................................................................... 33
Reporter Manual Mode..............................................................37
Connecting the 450D to 12V DC Power .................................. 38
Connecting the 450D to AC Power........................................... 39
Filling the Aqua-Hot................................................................... 40
Purging the Interior Heating Loop.............................................41
First Operation........................................................................... 42
Winterizing................................................................................. 43
Flow Diagram............................................................................. 44
Wire Sizing ................................................................................. 45
Appendix A: System Schematics.............................................. 46
Appendix B: Antifreeze.............................................................. 52
Appendix C: Parts & Accessories ............................................. 55
Warranty .....................................................................................61
Caution Notes
As you read this information, take particular note of the NOTICE,
CAUTION, WARNING, and DANGER symbols when they appear.
This information is important for safe and efcient use of the
Aqua-Hot system.
NOTICE signals a situation where potential damage to the
Aqua-Hot could occur.
CAUTION signals a situation where potential harm or risk of
minor or moderate injury could occur if you do not follow
instructions.
WARNING signals a hazardous situation where potential harm,
risk of serious injury, or death could result if instructions are not
followed.
DANGER signals a situation where immediate risk of serious
injury or death will result if instructions are not followed.
NOTE: This manual will also use notes sections similar to
this one to draw attention to features and practices which
must be observed.

IntroductionIntroduction
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 3p. 2
Safety Features
Low-Voltage Shutdown
The Aqua-Hot Reporter is designed to operate between 11V
DC and 16V DC. If the Reporter detects that it is receiving
voltage below 11.8V DC, a System Voltage fault will trigger
a display on the screen. If the Reporter system drops below
11.2V DC for 30 seconds, it will discontinue operation of
the Aqua-Hot heating system.
Over-Current
An Over-Current fault condition occurs when too much
current is drawn by a component, usually a fan or pump.
When this fault is triggered, the output channel is shut off
until the system has been reset or power-cycled.
Over-Temperature
An over-temperature fault will occur if your Aqua-Hot heating
system has reached 218°F. The Reporter will deactivate
the heater and display an over-temperature fault on the
display screen.
Low-Level Cutoff
If the system senses low uid levels, the heating system will
shut down all fans, heat sources, and pumps until the unit
is adequately relled.
Reporter “Heartbeat Function”
The Reporter units with rmware 1v5 and later and all
Reporter 2.0 units are equipped with a “heartbeat”
function that establishes a signal between the RV-C system
and the Reporter. The Reporter constantly awaits for a
signal from the RV-C network indicating to the Reporter that
it is to continue normal operation. Loss of 6 consecutive
signals from the RV-C network will trigger the Reporter to
deactivate the Aqua-Hot. Once power is restored to the
coach and the Reporter, “BATTERY DISCONNECT SWITCH
OFF” will be displayed in the fault log, indicating that the
Reporter lost connectivity with the RV-C network.
Manual Mode
The 2.0 Reporters with CFG 1.9 and greater come with a
manual mode in case the general coach RV-C network fails.
It will allow for limited operation while the larger network/
module problem is addressed.
Interlock Switch
The Aqua-Hot 450D is equipped with an interlock switch
that prevents the heater from operating when the cover is
not installed in the correct position or if it is not properly
secured in place. This is a safety device to ensure the
burner will not ignite if the service panel is not properly
secured.
Read all instructions before installing the Aqua-Hot unit. Aqua-
Hot Heating Systems is not liable for damage resulting from
failing to follow instructions contained in this, and any other
Aqua-Hot documentation relevant to this unit.
• Read this manual before installing or using the Aqua-Hot
System to reduce the risk of injury to persons or damage to
the equipment.
• The product identity label contains specications of the
unit, to what standards it has been tested, and important
safety notices.
• Disconnect electric wiring to the Aqua-Hot System before
welding or plasma cutting the coach to avoid damage to
equipment.
• The Aqua-Hot tank and heating loop operate at 0.0 PSI
(zero pressure system). Air pressure to the tank must not
exceed 20 PSI. Exceeding this rating will cause internal
damage to the Aqua-Hot.
• Use caution when working on or near any propane/diesel
fuel system.
• DO NOT connect the 12-volt DC power to the Aqua-Hot if the
vehicle requires welding.
• At maximum operating temperature, the coolant will be
very hot and scalding. Hot vapor or coolant may cause in
serious burns or injury. Be aware of hot surfaces.
• Installation and repairs may only be carried out by an
authorized, factory-trained Aqua-Hot technician. The
heating system must be installed in accordance with local
codes, or in accordance with the Standard for Recreational
Vehicles, (RVIA) ANSI A 119.2/NFPA 501C, NFPA 1192.
• Aqua-Hot will not be liable for problems or damage caused
by the system being installed by untrained personnel.
System Overview
The Aqua-Hot 450D is a Hydronic (water-based) Heating
System, a tank-less hot water system, and a diesel engine
preheating system.
The heating system provides moist, quiet, comfortable,
interior heat with up to 5 separate, thermostatically-controlled
temperature zones, and prevents tank and line freezing in the
bays.
The tank-less hot water system produces 90 gallons per
hour of continuous, on-demand hot water.
The diesel engine preheating system circulates the engine’s
antifreeze solution through an internal heating loop in the Aqua-
Hot and pumps it back through the engine, raising the engine’s
temperature from 30°F to 90°F in about 1 hour.
The same heating loop that preheats the diesel engine
allows the Aqua-Hot system to take surplus heat generated by
the motor home’s diesel engine while running, and use it to
heat the Aqua-Hot system.
This TribridHot™ designated system uses one or a
combination of heat sources to heat FDA-Approved Generally
Recognized As Safe (“GRAS”) Propylene Glycol-based antifreeze
solution in the Aqua-Hot’s boiler tank.
The 450D has multiple heating sources: the motor home’s
engine’s surplus heat (while driving), one 120V AC - 1650W
Electric Element (when plugged into shore power), and a 12V
DC powered diesel burner (when dry camping). These heat
sources can be used separately or simultaneously.
New Low Emissions Technology virtually
eliminates smoke and odor from the exhaust
by reducing total hydrocarbon emission by
82%, making Aqua-Hot the cleanest burning diesel-powered
hydronic heating system available.
Should additional assistance be needed, please contact the
Technical Support at 574-AIR-XCEL (574-247-9235), Monday
through Friday, between 7:00am and 4:00pm MST.
Important Notes:
• A qualied installer or service technician must perform
equipment installation or service. Contact Aqua-Hot for
Factory Authorized Service Centers or Certied Technicians
located near you at www.aquahot.com/service-help, or call
us at 574-AIR-XCEL (574-247-9235).
• Warranty work must be performed by an Aqua-Hot
Authorized Service Center.
• Your on-product identity label contains the specications of
your unit. Factory settings may be adjusted by the vehicle
manufacturer, conrm nal setting with your dealer.
• This heating system has been certied for installation only
in recreational vehicles, not certied for use in boats.
• The Aqua-Hot heating system operates independently of
the vehicle engine and is connected directly to the electrical
system of the vehicle.
• Please read this manual and follow instructions to avoid
injuries during installation and/or operation.
Hot Water Priority System
The Aqua-Hot 450D is a Hot Water Priority heating system.
Meaning that the 450D cannot heat the interior of the coach
and produce hot water simultaneously. When hot water is being
used, the interior heating system will shut off temporarily, until
hot water is no longer being used.
When hot water is requested, domestic water from the
coach’s fresh water tank is transported through a copper coil
in the Aqua-Hot’s boiler tank where heat is transferred from
the heated antifreeze and distilled water solution. The heated
domestic water then ows through the tempering valve to be
mixed with cool water from the fresh water tank to achieve an
appropriate temperature before it ows to the faucet.
As with any appliance, allow the Aqua-Hot to completely shut
down BEFORE disengaging the coach 12V power disconnect.
If the information in this manual is not followed
exactly, a re or explosion may result, causing property
damage, personal injury or death.
NOTE: For networked control of the Reporter, Aqua-
Hot requires system integrators ensure that individual
commands are received and processed. Aqua-Hot requires
that commands be repeated or conrmed so that if a
single message were dropped, or if there is a brief network
disturbance, the Reporter would get into the correct state as
soon as the disruption was removed.
The Aqua-Hot Reporter monitors the heating system and
handles all logic relating to safeties and heating control.
As such, the system integrator is required to display all
pertinent status information but not use that information to
lock out operation or add additional safety layers that could
impact the end of operation if a message from the Reporter
was missed.

Component Cut-AwaysSystem Features
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 5p. 4
System Specications
Diesel Burner
Heat Input (Firing Rate) ....................................... 56,000 BTU/hr
Fuel Consumption .......................................................0.40 gal/hr
Electric Element
Power Consumption......................................1650 W (maximum)
Voltage ..............................................................................120V AC
DC Power
Consumption ....................................................174 W (maximum)
Zone Heat Circulation
Pumps...........................................................................................2
Power Consumption (max).........................................21 W (each)
Voltage ............................................................................... 12V DC
Heating Zones
Maximum........................................................5 + Engine Preheat
Domestic Water Heating
Maximum.....................................................1.5 GPM On-demand
Physical Specications
Dimensions (US)..................................12” H x 18.5” W x 29.5” L
Dry Weight ......................................................................... 127lbs.
Wet Weight......................................................................... 185lbs.
All vehicle installations must comply with the requirements listed in
the Recreational Vehicle Industry Association’s (RVIA) ANSI/NFPA
1192 Handbook for Recreational Vehicle Standards. To receive a
copy of this handbook and other Pertinent RVIA Standards, write to:
Recreation Vehicle Industry Association, 1896 Preston White Drive,
PO Box 2999, Reston, VA 22090-0999. Call them at (703) 620-
6003 or visit online at www.rvia.org.
14 5 6 8
15
Figure 5
Figure 3
Figure 6
Figure 2
NOTE: This product label is attached to the top of the Aqua-
Hot, and provides a ready reference to specications, test
standards, and important safety notices.
2 3 7
17
16
NOTE: The top panel has been made transparent in the
view above to aid in the explanation of the heater. DO NOT
remove the top panel. Doing so risks irreparable damage to
the Aqua-Hot. Only remove the service panels.
18 19 20
212223
Figure 4
1. Drain Valve
2. Zone 1 Circulation Pump
3. Zone 2 Circulation Pump
4. Diesel Burner Controller
5. Combustion Air Sleeve
6. Diesel Burner
7. Diesel Fuel Lines
8. Interlock Switch
9. VAC Access Panel
10. AC Terminal Block
11. AC Terminal Port
12. Heating Zone 1 Outlet
13. Heating Zone 2 Outlet
14. Wiring Harness &
Harness Port
15. Aqua-Hot Reporter
16. Domestic Water Coil
17. Heating Loop Coil
18. Engine Preheat Outlet
19. Engine Preheat
Circulation Pump
20. Engine Preheat Inlet
21. Domestic Cold Water
Inlet
22. Domestic Hot Water
Outlet
23. Tempering Valve
Figure 1
9
11
10
12 13 14

Support and ClearanceComponent Cut-Aways
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Zone 1 & 2 Inlet Ports
Zone 1 & 2 Outlet Ports
Wiring Harness Port
AC Wiring Port
Air Release Valve
Expansion Tank
Connection
Product ID Label
The Aqua-Hot tank and heating loop operate at 0.0 PSI
(zero pressure system). Air pressure applied to the
tank MUST NOT exceed 20 PSI. Excess pressure will
result in internal damage.
Figure 7
Installing the Mounting Tray & Aqua-Hot
Install the Aqua-Hot in a compartment that is completely
closed off from living quarters and is accessible only from the
exterior of the coach.
1. Reference the following illustrations below for mounting
information.
2. Cut out the required mounting tray as shown in Figure 8.
3. Install the mounting tray ange into the cut out opening.
Reference Figure 9.
4. Insert a #10 machine screw into each of the embossed
holes in the mounting tray (6 total), and tighten to secure
the mounting tray to the coach.
NOTE: Inspect the area near the mounting location to
ensure that no structural members will interfere with
the cut-out for the mounting tray.
Figure 8
NOTE: The Aqua-Hot must be
supported by structural cross-
members that can support at least
185lbs.
5. Secure the mounting tray into place prior to installing the
Aqua-Hot.
6. Place the Aqua-Hot securely into the mounting tray to
ensure that the unit does not move or shift under normal
operating conditions. Reference Figure 10.
Figure 10
Figure 11
NOTE: Remove the bolt securing the front of
the access cover to the mounting tray. This
bolt will need to be reinstalled once the total
installation procedure is complete.
Figure 9
Diesel Fuel Inlet &
Outlet Ports

Fluid Expansion BottleSupport and Clearance
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Installation of the Expansion Tank
Introduction:
The uid expansion tank is integral to the operation of the
Aqua-Hot. It provides an area for hot, expanded uid to empty
into, and also protects the Aqua-Hot from low-uid, which could
lead to catastrophic damage of the Aqua-Hot.
Follow the directions in this section to correctly install the
uid expansion tank.
Installation Procedure:
1. Mount the expansion tank as illustrated in Figure 13. The
overow tube should have an incline.
2. Connect and clamp the overow tube from the expansion
tank to the Aqua-Hot’s expansion tank connection as
shown in Figure 13.
3. Drill a hole in the bay oor and connect a long enough piece
of overow tubing so that it can be connected to the top
of the expansion tank and extend through the bay oor.
Secure tubing with clamps.
NOTE: Avoid any bends or dips in the overow tubing from
the Aqua-Hot. Air can become trapped in these bends and
will prevent excess antifreeze and water heating solution
from depositing properly in the expansion bottle.
Hot Fluid Line
Cold Fluid Line
Fill Cap
Lower Fitting
Upper Fitting
Figure 12
Figure 13
Overow Tube
Expansion Tank
Pressure Relief Valve
Expansion hose. Must
vent to the exterior of
the vehicle
Hole in the coach bay
oor for overow hose
Fluid Expansion Tank
All measurements
are in inches
NOTE: The top of the expansion tank must be mounted
higher than the highest point on the Aqua-Hot.
Tension Clamp
Tension Clamp

Fluid Expansion BottleFluid Expansion Bottle
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Exhaust System Requirements
• The exhaust must be able to freely exit away from the
vehicle without any obstructions.
• Angle the exhaust pipe towards the rear of the vehicle,
so that exhaust fumes will naturally move away while the
vehicle is in motion. See Figure 16.
• Use standard 2” automotive-type exhaust piping and avoid
bends, if possible. A minimum 1.75” ID automotive-type
exhaust pipe may be used. See Figure 15 & Figure 18.
• A maximum of three 90° exhaust bends are allowed.
Reference Figure 15.
• Do not use galvanized pipe ttings (only black-iron pipe and
ttings should be used). Reference Figure 18.
• The total length of exhaust pipe should not exceed 27.5
feet.
• The Aqua-Hot is supplied with a 3 inch and 4 inch black pipe
nipple (1.5 inch diameter) along with a 1.5 inch exhaust
elbow. Reference Figure 16. These three exhaust system
components MUST BE utilized with all product installations.
Be sure to reference Figure 17 and 18 to determine which
exhaust nipple should be connected directly to the Aqua-
Hot’s exhaust port (the 3 inch of the 4 inch black pipe
nipple).
Exhaust System Exhaust System
The Aqua-Hot’s exhaust is HOT and must be kept away
from any heat sensitive material(s). Do NOT direct
exhaust downward as a re may result when parked in
dry, grassy areas.
All Aqua-Hot exhaust system installations MUST utilize the
two black pipe nipples and black pipe elbow, which are
provided with the heating system in the conguration to be
suited for the particular RV application. Failure to conform
could create a hazardous situation and WILL void the Aqua-
Hot’s ETL Product Listing.
NOTE: Refer to “Internal Combustion Engine Exhausts and
Vehicle Wall Openings” in RVIA’s ANSI/NFPA 1192 Handbook
for the Recreational Vehicle Standards, as well as the
National Fire Protection Associations’ (NFPA) 1192 Standard
on Recreational Vehicles for additional information.
Figure 16
Installation Procedure:
1. Run the exhaust pipe to the driver’s side or to the back
of the vehicle and ensure that the exhaust fumes cannot
enter into the passenger compartment.
2. Be sure to secure the end of the exhaust pipe to the vehicle
with the proper exhaust hanger/support hardware.
NOTE: Should this particular application require more
than 27.5 feet of exhaust pipe, please contact Aqua-Hot at
574-AIR-XCEL (574-247-9235) for assistance.
NOTE: The exhaust elbow can be rotated 270°,
as shown in the illustration; however, the exhaust
must not terminate beneath the vehicle or beneath
an open-able window or vent.
NOTE: A maximum of three 90° bends are allowed
in the exhaust pipe. Also, the exhaust pipe cannot
be longer than 27.5 feet.
Figure 15
1.5 inch ID Black Pipe Exhaust Fitting
2.0 inch ID Automotive Type Exhaust Pipe
The two black pipe exhaust ttings MUST be utilized
with all installations! Failure to conform could create
a hazardous situation and will void the Aqua-Hot ETL
Product Listing.
1.5 inch Exhaust Port
View from Underneath Aqua-Hot
Exhaust Elbow and
Nipples Assembly
Figure 14

Installing Heat ExchangersFluid Expansion Bottle
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Installation Requirements
Cozy heat exchangers can be mounted in one of two
congurations: either at on the ground, or vertically. Reference
Figure 19.
• Supply ventilation cross-sectional area of at least 29in2
(74cm2) must be supplied to each heat exchanger.
• Do not supply heat exchangers air which is drawn from the
bay areas; air supply should only be from the living areas.
• Return air should be drawn from the same room the heat
exchanger is heating.
• The antifreeze and water heating solution must ow in
through the bottom of the heat exchanger, and out the top
(reference Figure 22).
• In order to provide sufcient ventilation, the return air
registers must be the same size, or larger, than the outlet
air registers.
Vertical Orientation
Horizontal Orientation
Figure 19
Figure 20
Heat Exchanger Locations and
Clearances
• Position the heat exchangers so that even heat is distributed
throughout the coach interior.
• The rst heat exchanger on the loop will output the most
interior heat.
• It is best practice to place the heat exchanger in an area
where it can be easily accessed for maintenance and
cleaning.
• Place the heat exchangers as close to the oor as possible
for best performance.
• If a heat exchanger is kept in the fresh water storage bay,
then the last heat exchanger in the coolant loop should be
used. See Figure 20.
• The heating air supply may be fresh or recirculated air that
is drawn from a clean area not likely to be contaminated.
Aqua-Hot advises against placing a heat exchanger on the
slide-out section of any vehicle due to the high probability
of damage occurring to the heating loop from moving parts.
NOTE: Do NOT install more than four heat exchangers per
heating loop. If additional heat exchangers are required,
use a booster pump (not included) to provide additional
antifreeze ow capability.
Figure 21
Exhaust System
Figure 17
Figure 18
3” Black Pipe
Nipple Installed
Black Pipe Elbow
4” Black Pipe
Nipple Installed
2” Automotive Type
Exhaust Pipe

Locations and ClearancesLocations and Clearances
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Mounting
Tabs (both
sides)
Inlet
Outlet
Figure 23
Figure 22
Installing Heat Exchangers
Mounting the Heat Exchangers
1. Cut out a 2.5” H x 10” W (7cm x 26cm) opening for each
heat exchanger outlet and cold-air return grate as shown
in Figure 25.
2. Mount each heat exchanger permanently into place. There
are 4 tabs on both sides - see Figure 22.
3. Install the hot-air outlet and cold-air return grate.
A minimum of supply ventilation cross-sectional area of at
least 29in2(74cm2) must be supplied to each heat exchanger.
If the toe-kick area is inadequate to house a heat exchanger
for regular installation, a plenum assembly may be purchased
to redirect air via ducting. Refer to Figure 26.
1 2 3 4 5
1. Hot Air Outlet Vent
2. Air Ducting Hose
3. Plenum
4. Cozy Heat Exchanger
5. Toe Kick Board
Mounting the Heat Exchangers
Figure 25
Figure 24
Figure 26
NOTE: When wiring the heat exchangers in parallel, the
main 18-gauge wire is split to allow the heat exchanger
wires to combine with the main wire to be powered or
grounded, respectively.
Figure 27
- (Ground) Black Wires
+ (Positive) Red Wires

Plumbing the Heating LoopWiring Heat Exchangers
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Wiring the Heat Exchangers
This section will explain in detail how to wire the heat
exchangers for optimal functionality. Do not deviate from these
guidelines. If a deviation is required, contact Aqua-Hot Heating
Systems prior to installing these exchangers for express
permission to proceed with modications.
1. Wire each heat exchanger (in a heating zone) in parallel to
one another as shown in Figure 30.
2. Wire each heat exchanger independently to the J7 plug of
the Reporter.
3. Pin-out information is shown below.
NOTE: Night-mode functionality of the new controller requires
that the heat exchangers be wired directly into the controller.
Zone Fan Number Supply (+) Pin
Number
Ground (-) Pin
Number
1 J7-12 J7-9
2 J7-2 J7-5
3 J7-11 J7-8
4 J7-1 J7-4
5 J7-10 J7-7
Connector Part Numbers
Part Number Manufacturer Description
1-480706-0 TE Connectivity J7 Plug Housing
350550-1 TE Connectivity J7 Socket Terminal
J7 Mating Plug
Figure 28
Figure 29
Figure 30
1211
987
654
J7 Wire insertion view shown
321
10
Plumbing the Heating Loop
Once all heat exchangers have been mounted, plan the
routing of the plumbing lines from each heating zone to the
Aqua-Hot. The following guidelines should be used when
planning the coolant loop(s) for the heating zone. The order
of the heat exchangers should consider priority on the loop(s).
Failure to adhere to these installation principles can hinder the
operation of the heat exchangers.
• All plumbing should be installed as atly as possible.
• Extreme rises in height should be avoided to avoid any
potential air traps.
• Use ⅝” ID (Inside Diameter) plumbing lines, ¾” SAE J20
type coolant hose, heater hose, or PEX tubing for the
heating loop(s).
• Use wide-sweeping elbows or “bend supports” whenever
the plumbing lines may be susceptible to kinking.
• Plumbing lines should be run in areas where there is no
reasonable possibility that they can be pinched off or
damaged under normal operating conditions.
• Secure all lines where necessary and apply protective
shielding in areas where chang may occur.
• Rubber coated/closed-type clamps are recommended
when securing the plumbing lines.
• Inlet and outlet plumbing lines can be installed with a
straight tting or an elbow.
• See Figure 32 for reference.
Instructions:
1. Layout the plumbing lines for all heat exchangers.
2. Label each line with the heating loop number and
designate as an outlet or an inlet line.
3. Connect and clamp the outlet line from the heater to
the lowest port (inlet port) with the longest run for both
heating loops.
4. Connect and clamp a line from the rst heat exchanger’s
highest port, and connect the other end to the next
heat exchanger’s lowest point.
5. Connect each additional heat exchanger in the same
arrangement.
6. Connect and clamp the inlet line from the heater to the
highest port on the last heat exchanger to complete
the heating loop.
Figure 32
Inlet
Outlet
PEX Insert Hose
Clamps ¾” Coupler
Figure 31
NOTE: Plumbing heat exchangers in this manner
will allow air to escape naturally. If air is trapped in
any heat exchanger, it will signicantly reduce the
exchanger’s overall heating performance.
Heating Loop #1
Heating Loop #2
Heating Zone #1
Heating Zone #3 Heating Zone #2 Heating Zone #4
Incoming Plumbing Lines
Outgoing Plumbing Lines
NOTE: The kitchen and living room heat exchangers must be
plumbed together in-series on “Heating Loop 1”. The fresh
water tank, bedroom, and bathroom heat exchangers must
be plumbed together in-series on “Heating Loop 2”. See
the diagram below.
J7 Socket Terminal

Plumbing the Heating LoopPlumbing the Heating Loop
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 19p. 18
Figure 33
Figure 35
Figure 34
Figure 36
Barbed Fittings Components Compression Fittings Components
Barbed Fittings Components Installed Compression Fittings Components Installed
NOTE: For the best performance, the rst heat
exchanger should be placed where heat loss is the
greatest. The rst heat exchanger will always output
the largest volume of heat as compared to subsequent
exchangers.
NOTE: This is just a sample for mounting locations of the
Cozy heat exchangers. Actual placement and quantity may
vary on the individual design of the RV. For questions or
assistance, contact Aqua-Hot at 574-AIR-XCEL (574-247-
9235).
Figure 37
Heat Exchangers Layout
Engine
Bedroom
Heat Exchanger
Engine
Preheating
Fresh Water Tank
Heat Exchanger
Bathroom
Heat Exchanger
Aqua-Hot
Heating System
Living Room
Heat Exchanger
Heating Loop 1
Kitchen & Living
Room Heating Zone
Living Room
Heat Exchanger
Kitchen
Heat Exchanger
Heating Loop 2
Bathroom, Bedroom,
& Fresh Water Tank
Bay Heating Zones
Fresh Water Tank
Figure 38

Plumbing the Heating LoopPlumbing the Heating Loop
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Engine Preheat
Engine Preheat & Motor-aide System
The Aqua-Hot 450D includes a motor-aide feature that
uses the circulation of the motor home’s engine to transport
the antifreeze and water heating solution from the Aqua-Hot’s
boiler tank to the motor home’s warm engine and back to the
boiler tank. The 450D also includes an engine preheat feature
that provides an easy engine start-up whenever colder weather
conditions are present.
Engine Preheat Location
• The inlet and outlet ports on the vehicle’s engine should
be kept as far apart as possible. This will ensure that the
entire engine is thoroughly preheated. See Figure 39.
• The engine’s coolant should be allowed to ow as freely
as possible to maximize the Aqua-Hot’s engine preheating
system.
• The engine’s inlet port is where the heated coolant is
transported to the engine block from the Aqua-Hot. This
port should be a high connection point on the engine block.
Refer to Figure 39.
• The engine’s outlet port is where the engine’s coolant is
transported to the Aqua-Hot. This port should be a low
connection point on the engine block or a pressure outlet
port on the engine’s water pump (Figure 39).
• Ensure that the engine preheat inlet and outlet hoses are
not placed too close to the engine’s turbocharger.
Plumbing Requirements
• Use ¾” ID (Inside Diameter) plumbing lines, automotive-
type heater hose for the engine preheating system.
• Lay both engine preheat lines as at as possible and
avoid any extreme rises in height in order to eliminate the
potential for air traps.
• Run both plumbing lines in areas where they cannot be
pinched off or damaged during normal operating conditions.
• Use one-piece engine plumbing ttings in order to reduce
the potential for coolant leaks. It is recommended that pipe
thread sealant be used on all engine plumbing.
NOTE: If assistance is needed in determining the best inlet
and outlet ports for a specic engine, please contact the
particular engine’s manufacturer or chassis supplier.
NOTE: Rubber coated, closed-type clamps are recommended
when securing the plumbing lines.
Plumbing Installation
1. Install both engine preheat plumbing lines and mark with
arrows and/or labels at both ends.
2. Drain the engine’s coolant.
3. Remove the selected inlet and outlet port “plugs” from the
engine.
4. Install and tighten the plumbing ttings into the inlet and
outlet ports on the vehicle’s engine.
5. Install and clamp both the inlet and outlet engine plumbing
lines, automotive-type heater hoses to the engine’s
plumbing ttings. Reference Figure 39.
6. Install and tighten a plumbing tting into the “inlet” port on
the Aqua-Hot’s engine preheating system. See Figure 40.
7. Attach and clamp the engine’s incoming plumbing line to
the Aqua-Hot’s outlet connection.
8. Attach and clamp the engine’s outgoing plumbing line to
the Aqua-Hot’s inlet connection.
9. Verify all ttings and connections have been tightened,
then rell the engine’s coolant system.
NOTE: The labels should indicate whether the plumbing
line is transporting coolant to the Aqua-Hot, or if it will
be transporting heated coolant to the vehicle’s engine.
Reference Figure 39.
NOTE: Should one or both of the selected engine ports
already have plumbing ttings attached, it may be necessary
to “tee” into those existing plumbing ttings. Please contact
Aqua-Hot Heating Systems at [phone] for
additional assistance.
Engine Preheat
Figure 39
Vehicle Engine
Ideal Incoming Port
(top side of engine) Potential Outlet Port
To Aqua-Hot’s Engine
Preheat “Inlet” Port
(M) NPT by
Hose Barb
Hose Clamp
Automotive-Type
Heater Hose
45’ (M) NPT by
Hose Barb
Hose Clamp
Automotive-Type
Heater Hose
From the Aqua-Hot’s
Engine Preheat “ Outlet” Port
Engine Preheat
Circulation Pump
Engine Preheat
Outlet
Engine Preheat
Inlet
Figure 40

Plumbing the Heating LoopPlumbing the Heating Loop
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 23p. 22
Fuel System
Diesel Fuel System
The following section outlines the requirements for diesel
fuel delivery to the Aqua-Hot unit. Read and adhere to all of the
outlined requirements to ensure best, and safest performance
of the Aqua-Hot.
A kinked fuel line (return side) will increase the fuel pressure
to hazardous levels and may cause a fuel line to rupture. A
kinked fuel line could also severely damage the diesel burner’s
internal fuel system.
Fuel Filter Location
• Mount the fuel lter assembly in a location that provides
easy access for replacing the lter and for catching any
potential fuel spillage when servicing.
Fuel System Requirements
• The diesel fuel supply should be drawn directly from the
vehicle’s main fuel tank or from a separate auxiliary fuel
tank, if applicable.
• The fuel tank should be equipped with a dedicated fuel
pick-up pipe (outlet and inlet port). Reference Figure 41.
• Use ¼” ID (Inside Diameter) fuel lines.
• The combined length of the supply and return fuel lines
should not exceed 100 feet in total length. Reference
Figures 42 & 43.
• All fuel-tting hardware (at the vehicle’s fuel tank: fuel lter
and Aqua-Hot fuel parts) must be ¼” NPT or greater with
a ¼” barbed tting. Fuel ttings less than ¼” NPT may
restrict fuel ow, thereby compromising the diesel burner’s
performance.
NOTE: If an auxiliary fuel tank is required, be sure to
consult the ANSI/NFPA 1192 Handbook concerning heating
system’s diesel fuel system specications.
Fuel System Installation
• Both fuel lines (supply and return) should be laid as
at as possible and any extreme rises in height should
be avoided in order to eliminate any potential air traps.
• Run both fuel lines in areas where they cannot be
pinched, kinked, or damaged during normal operation.
• Run the fuel tank outlet fuel line past the fuel lter
location in preparation for Step 7.
1. Run two ¼” fuel lines from the fuel tank inlet and outlet
ports to the Aqua-Hot.
2. Be sure to secure all fuel lines where necessary and apply
protective shielding in areas where chang may occur.
3. Label both fuel lines indicating whether they are an
outgoing line or incoming line.
4. Connect the Aqua-Hot’s fuel lines to the vehicle’s fuel tank.
5. Install and tighten the appropriate fuel ttings onto the
Aqua-Hot’s fuel ports, as well as the two ports of the fuel
lter. Reference Figure 44 & 45.
6. Connect the inlet and outlet fuel lines to the Aqua-Hot’s fuel
port connections.
7. Cut the fuel line at the fuel lter mounting location and
connect the fuel lines as illustrated in Figure 44.
NOTE: Be sure the ow of fuel through the lter is in the
correct direction.
Vehicle Fuel Tank
Outlet Port:
to Aqua-Hot’s
fuel lter
Fuel Pick-Up Pipe
NOTE: The fuel pick-up pipe should not extend further than
the motor home’s engine fuel supply pick-up and should be
consistent with the on-board generator’s fuel supply pick-up
length. Figure 41
Inlet Port:
from Aqua-Hot’s
outlet port
Fuel System
Fuel Supply
Fuel Return
Figure 42
Figure 43

Domestic Water SystemPlumbing the Heating Loop
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 25p. 24
Fuel System
¼” NPT (F)
Diesel Inlet
Port
¼” NPT (F)
Diesel Outlet
Port
Output to the
Aqua-Hot’s Fuel
Inlet Port
Input from Fuel
Tank/Fuel Pick-
Up Pipe
TOP View
Fuel Filter
Figure 44
Figure 45
Domestic Water System Requirements
• Reference A119.2/NFPA 501C Standard on Recreational
Vehicles 1993 Edition for relevant regulatory information
regarding the design of Domestic Water Systems.
• The Aqua-Hot is equipped with a pressure relief valve and a
tempering valve in order to provide safe hot water without
chance of scalding or an over-pressurized system.
• Plumb the domestic water system according to Figure 47.
Figure 46
NOTE: Extended exposure to household bleach will corrode the
components of the Aqua-Hot that will potentially dramatically
shorten the operational lifetime of the Aqua-Hot. Under no
circumstances is the Aqua-Hot to be exposed to household bleach
for extended periods of time. This type of damage is not covered by
the Aqua-Hot warranty.
Tempering Valve
Use the RVIA provided table below in order to determine the
proper sizing of pipe and tubing required to ensure maximum
efciency. The size of the water supply piping and branch line
shall not be less than specied in the table below.
Please note it may be necessary to utilize an accumulator
tank within the domestic water system. Reference Figure 47.
Although the 450D is equipped with a pressure relief valve,
the use of an accumulator tank will help prevent excessive
“weeping” of the valve. Manufactured pressure relief valves
will cause the “seat” in the valve to deteriorate, which can
cause the valve to fail permanently. Be sure to reference the
RVIA’s (Recreational Vehicle Industry Association) technical
publication titled “Recreational Vehicle Plumbing Systems”. To
obtain a copy of this publication, contact RIVE at (730) 620-
6003 or visit them online at www.rvia.org.
NOTE: As stated directly from the ANSI A119.2/NFPA 501C
Standards on Recreation Vehicles, 1993 Edition:
“Piping Systems shall be sized to provide an adequate
quantity of water to each Plumbing Fixture at a ow rate
sufcient to keep the Fixture in a clean and sanitary condition
without any danger of back-ow of siphoning”.
Domestic Cold
Water Inlet
Domestic Hot
Water Outlet
WATER SUPPLY PIPE SIZES

Domestic Water SystemDomestic Water System
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 27p. 26
Plumbing the Domestic Water System
The Aqua-Hot is also able to provide domestic hot water
while the boiler tank is up at operating temperature. Activate
the Diesel burner to provide adequate heat for hot water needs.
The electric element will provide light duty hot water.
The tempering valve is integrated into the cabinet of the
Aqua-Hot, and is set upon departure from the Aqua-Hot factory.
So long as the tempering valve is not modied, it will provide
hot, non-scalding water. The Aqua-Hot is required to have a
pressure relief valve that releases excessive pressure in the
domestic water system.
Instructions
1. Connect a domestic water plumbing line from the domestic
water demand pump to the cold water inlet port (blue PEX)
on the Aqua-Hot.
2. Connect a domestic water plumbing line from the Aqua-
Hot’s hot water outlet port (red PEX) to the hot water
system’s distribution lines.
Fresh Water Tank Thermostat
Select a location that will ensure even heat distribution
throughout the fresh water storage bay compartment in order to
prevent the domestic water and plumbing system from freezing.
Typically, only the bulb of the thermostat needs to be
physically mounted in the area requiring heat (usually in close
proximity to the domestic water pump). Reference Figure 49.
• Do not mount the thermostat bulb in a drafty area or
along the ceiling of the bay.
• The selected mounting location should allow for easy
access and should be as low in the bay area as possible.
• Avoid mounting the fresh water tank thermostat’s bulb
too close to the bay heat exchanger.
• Aqua-Hot recommends using Heating Zone 4 for the
Bay thermostat, as Zone Circulation Pump 2 is for Zone
4. However, you can wire to which ever zone of your
preference.
Fresh Water Tank Thermostat Mounting
1. Select a location for the thermostat bulb in the fresh
water storage tank bay compartment.
2. Once the thermostat has been completely wired,
permanently mount the thermostat in place.
Fresh Water Tank Thermostat Wiring
1. Run two 18-gauge wires from the thermostat’s mounting
location to the Aqua-Hot’s Reporter J1 & J9 Pin.
2. Insert the positive wire (#82) to the J9-5 Pin on the
Reporter, and insert the ground wire (#83) to J1-8 Pin.
3. Connect both wires to the appropriate leads of the
thermostat.
Room Thermostat Locations
Select a location that will ensure even heat throughout each
heating zone. Place each room thermostat at approximately
chest level, if applicable.
The selected location should prevent the thermostat from
being affected by the following.
• Drafts or dead spots behind doors and in corners.
• Hot or cold air ducts.
• Radiant heat from sun or appliances.
• Heat from concealed pipes and chimneys.
• Unheated or uncooled areas such as an outside wall
behind the thermostat.
Room Thermostat Mounting
1. Select a location for the thermostat in the coach.
2. Once the thermostat has been completely wired,
permanently mount the thermostat in place. Be sure
the thermostats are turned OFF.
Room Thermostat Wiring
1. Run two 18-gauge wires from each room thermostat
mounting location to the Aqua-Hot’s Reporter J1 & J9
Pins.
2. Insert the positive wire to the J9 Pin on the Reporter,
and insert the ground wire to J1 Pin.
3. Connect both wires to the appropriate leads of the
thermostat. Reference the wiring schematic on Page 51.
Figure 49
Mounting Tab
Bulb
Thermostats
Capillary Tube
Thermostat Rear View
Terminals
Figure 48
To Hot Water Faucets
Tempered
Domestic Hot Water
Fresh Water
Storage Tank
Cold Water Faucets
Demand Pump
Figure 47
AT
AT
AT
Indicates options for mounting
an Accumulator Tank.
AT

Mounting the Aqua-Hot LCDMounting the Aqua-Hot LCD
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 29p. 28
Switch Panel
Interior Switch Panel
Select a location in the interior of the coach that allows for
easy operator access. The switch panel should be installed in
a central location inside the coach that is easily accessible to
turn the system on and off. Mounting plate dimensions for the
panel are shown below.
Coach Control Panel Screen:
Newer Aqua-Hot units that come equipped with the Reporter
may have a coach touch-screen display instead of the interior
switch panel. This section is only for the installation and wiring
for the interior switch panel.
All electrical installations, systems, and equipment shall
comply with Article 551, Parts I through VI of NFPA 70, as well
as the regulation of authorities having jurisdiction and CSA
Standard B139.
Switch Panel Mounting
1. Cut out a 3.75” W x 1.25” H opening for the switch
panel plate. Reference Figure 50.
2. Once the switch panel has been completely wired,
permanently mount the switch panel in place.
3. Using four countersunk 3mm (#4) screws, secure the
switch plate into place over the cutout just made.
Switch Panel Wiring
1. Run 16-gauge wires from the switch panel to the
Reporter.
2. Strip and crimp insulated female terminals onto each
wire at the switch panel location.
3. Connect all switch wires to the appropriate switch
connections. Reference the following diagrams per the
switch model.
4. Insert all switch wires into the appropriate pin connection
for the Reporter. Reference the schematic on Page 49.
5.00”
4.45”
2.88” 2.33”
Ø 0.15”
Figure 50
NOTE: Be sure to attach “Jumper Wires” where
necessary. Reference the following switch diagrams.
Switch Panel
Switch
Pin
Wire Harness
#2 J9-1
#4 J1-4
#9 Chassis Ground
Switch
Pin
Wire Harness
#2 J1-1
#4 J9-3
#10 J7-3
#9 Chassis Ground
Switch
Pin
Wire Harness
#2 J9-2
#4 J1-2
#9 Chassis Ground
NOTE: The Engine Preheat and Electric Element switches possess
jumper wires that advance from terminal 4 to terminal 10.
Figure 51
Engine Preheat Electric Element Diesel Burner
Switches Rear View
JUMPER WIREJUMPER WIRE

Introduction to WiringIntroduction to Wiring
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 31p. 30
Wiring the Aqua-Hot
This section will introduce the basic considerations,
practices, and information necessary to wire the Aqua-Hot to
any relevant coach-side systems.
\
J8 Plug:
The J8 plug is responsible for connections that pertain to
sensor monitoring within the coach, and is standardized across
all Reporter-bearing Aqua-Hot heating systems.
Pin
Number
Description Wire No.
J8-1 Low-Level Sensor Input 16
J8-2 Low-Temp Sensor Input 10
J8-3 Tank Temp Sensor/Control
Thermostat
14
J8-4 Low-Level Power Supply (12V DC+) 15
J8-5 Low-Temp Power Supply (12V DC+) 9
J8-6 Tank Temp Sensor/Control
Thermostat
13
J1 Plug:
The J1 plug manages heating
zone inputs from the coach.
Heating Zone 1 is reserved
electrically for the “Living
Room - Kitchen Heating Zone”
(Heating Loop 1) ONLY. Heating
zones 2, 3, & 4 are reserved
electrically for the “Bathroom,
Fresh Water Tank, and Bedroom
Heating Zone” (Heating Loop 2)
ONLY.
Heating Zone 5 is reserved for the “Optional Heating Zone”
(Heating Loop 1) ONLY.
See pin-out information below.
Pin
Number
Description Wire No.
J1-1 Diesel Input 51
J1-2 Electric Low Input 53
J1-3 Not Used -
J1-4 Engine Preheat Input 55
J1-5 Zone 1 Input 95
J1-6 Zone 2 Input 91
J1-7 Zone 3 Input 87
J1-8 Zone 4 Input 86
J1-9 Zone 5 Input (Optional) 79
987
654
321
J1 Wire insertion view shown
Installation must be performed by a professional installer
or technician as per national/local regulations.
Improper installation can cause property damage, injury, or
death.
Figure 52
Figure 53
NOTE: Reference the Schematics starting on Page 46 for
more information.
J8 Wire Insertion View Shown
654
321
J7 Plug:
The J7 plug manages zone fans and the burner switch indicator
light..
Pin No. Description Wire No.
J7-6 Burner Indicator Light Ground 57
J7-3 Burner Indicator Light 56
J7-12 Zone Fan 1 (Switched 12V+) 92
J7-9 Zone Fan 1 Ground 93
J7-2 Zone Zan 2 (Switched 12V+) 88
J7-5 Zone Fan 2 Ground 77
J7-11 Zone Zan 3 (Switched 12V+) 84
J7-8 Zone Fan 3 Ground 85
J7-1 Zone Zan 4 (Switched 12V+) 80
J7-4 Zone Fan 4 Ground 81
J7-10 Zone Fan 5 (Switched 12V+) 76
J7-7 Zone Fan 5 Ground 78
J7 Wire Insertion View Shown
121110
987
654
321
J9
The J9 plug is an optional use terminal
that provides constant 12V DC current to any
attachments which may be added to the coach.
J9 Pin No.
J9-1
J9-2
J9-3
J9-4
J9-5
J9-6
J9-7
J9-8
Description
Engine Preheat
Electric
Diesel 12V DC Switch
Zone 5 Thermostat
Zone 4 Thermostat
Zone 3 Thermostat
Zone 2 Thermostat
Zone 1 Thermostat
Wire No.
54
52
50
78
82
86
90
94
Figure 55
Figure 54
J9 Wire Insertion View Shown
8
7
6
5
4
3
2
1
ZONE
1
ZONE
2
ZONE
3
ZONE
4
ZONE
5
ZONE 5
ZONE 4
ZONE 3
ZONE 2
ZONE 1
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 5

Introduction to WiringIntroduction to Wiring
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 33p. 32
J3
J3 serves as the RV-C connection to the coach-
side comfort system (if applicable). The RV-C
indicator light located on the back of the Reporter
serves as a valuable diagnostic tool when the need
to determine RV-C functionality arises.
Wire Insertion View Shown
J3 Pin No. Description
1
2
3
4
12V DC+ Current Out (Optional)
CAN-HIGH
CAN-LOW
Ground
Figure 56
J2
The J2 Plug is responsible for managing return signals from
within the coach.
Pin Number Description Wire No.
J2-1 Pump 1 Output (12 V DC+) 5A1
J2-2 Pump 1 Ground 6
J2-3 Zone 1 Boost Pump -
J2-4 Pump 2 Output (12V DC+) 3A
J2-5 Pump 2 Ground 4
J2-6 Power On Signal 24
J2-7 Pump 3 Output (12V DC+) 1
J2-8 Pump 3 Ground 2
J2-9 Zone 2 Boost Pump 39
J2-10 Pump 4 Output (12V DC+) 7
J2-11 Pump 4 Ground 8
J2-12 Electric Element On-Signal 11
J2-13 AC Ground 12
J2-14 Burner Ground 21A
J2-15 Diesel Burner Status Input 19
Figure 58
The J3 plug connects to the on-board RV-C system of the coach
(if applicable). The RV-C indicator light located on the back of
the Reporter serves as a valuable diagnostic tool when the
need to determine RV-C functionality arises.
The J3 Plug is a 4-pin connector with self-contained power pins.
See the diagram below for the crimping information for the J3
plug. Crimp these parts together using pliers.
Manufacturer Part No. Description
3M 37401-2165-
000 FL 100 4-Position Plug (Male)
3M 37104-2165-
000 FL 100
4-Position Receptacle Plug
(Female)
General
Cable E2104S.41.02 4COND 22AWG WHT SHLD Cable
The parts listed above can be purchased from any major
electronics retailer. Only the parts listed above are approved for
use in the Aqua-Hot.
12V DC Power (J3-1)
Ground (J3-4)
Data (J3-2, J3-3)
Figure 57
1
J2 Wire Insertion View Shown
2 3
4 5 6
7 8 9
10 11 12
13 14 15
The Aqua-Hot Reporter
The Aqua-Hot Reporter is a new generation of command and
control module that manages all functions of the Aqua-Hot from
start-up to shutdown. The previously used electronic control
board has been retired on new units in favor of the Reporter.
There are two series of Reporters presently in use: Reporter
1.0 and Reporter 2.0. Reporter 1.0 was launched November
30, 2018, and Reporter 2.0 was launched September 9, 2019.
The launch of Reporter 2.0 allowed an opportunity to improve
upon the 1.0 design where ever it was deemed necessary. The
Reporter 2.0 features the following design improvements:
• Over-Temperature Fault Functionality
• Precise uid coolant temperature display
• Boost pumps are now powered directly by the Reporter
Functionality:
The Reporter was designed with a touch-screen interface to
simplify and standardize unit use and troubleshooting. Screen
navigation and access is now standardized across the Aqua-Hot
450 Series Diesel (DE5 and newer).
The Reporter also contains fault logging functionality,
troubleshooting tools, and testing functions. Each of these
functions will be explained in detail.
Basic Features:
The Home Screen is the rst screen shown on the Reporter.
Reporter 1.0 and Reporter 2.0 home screens do differ.
The most substantial difference between the Reporter
1.0 and 2.0 is the inclusion of a thermistor in place of the
standard control thermostat. This allows specic Aqua-Hot
coolant tank temperatures to be displayed on the Reporter, and
relayed to the on-board comfort control systems (if the coach
manufacturer installs one). The tank temperature sensor allows
more granular control of the Aqua-Hot by switching away from
the static temperature limitations imposed by the previous
control thermostat.
The Reporter contains a host of diagnostic and troubleshooting
tools to more easily repair and operate Aqua-Hot units. These
features are organized into pages and sections that are further
explained in this guide.
Home Screen
The home screen contains information about the Aqua-
Hot system status, as well as model and serial number
information.
Fault Status
The fault status page contains the last seven faults which
were observed by the Reporter, regardless of how much time
has passed.
Coach Side I/O
This page of the Reporter will indicate the current status of
elements and switches within the coach; such as, the coach
is requesting hot water or heat.
Aqua-Hot I/O
The Aqua-Hot I/O page will show the current status of
elements, sensors, and components within the Aqua-Hot
itself.
Figure 60
Figure 61
Figure 62
Figure 63
Aqua-Hot Reporter
Figure 59

Conguring the ZonesConguring the Zones
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 35p. 34
Heat Testing:
The heat testing page of the Reporter will allow the electric
and burner heating sub-systems to be independently
activated for troubleshooting and testing purposes.
Fan Testing:
The fan testing section of the Reporter will allow the
heat exchanger fans within the coach to be activated
independently of the rest of the Aqua-Hot.
Pump Testing:
The pump testing page of the Reporter functions similarly to
the fan testing page in that, from this Reporter page, pumps
within the Aqua-Hot can be activated independently from
other elements for their functionality to be veried.
Figure 64
Figure 65
Figure 66
Heartbeat Function
Aqua-Hot Reporter units with at least rmware version 1v5
and all Reporter 2.0 units are equipped with a “heartbeat”
function which establishes a signal between the RV-C system
and the Reporter.
The Reporter 12V+/- wires are connected directly to the
coach battery. The Reporter has an RV-C incorporated house
power sense in the event RV-C connection is lost, i.e. house
batteries disconnected or RV-C network has failed.
The Reporter will be constantly awaiting a signal from the
RV-C network indicating to the Reporter that it is to continue
normal operation. Loss of 6 consecutive signals from the RV-C
network will trigger the Reporter to deactivate the Aqua-Hot.
This serves as a safety feature to ensure that the Aqua-Hot
does not continue to operate if the coach loses power. Once
power is restored to the coach and the Reporter unit, “BATTERY
DISCONNECT SWITCH OFF” will be displayed in the fault log,
indicating that the Reporter has lost connectivity with the RV-C
network, and subsequently deactivated.
Technical Information
Mounting:
The Aqua-Hot Reporter can be mounted in two different
fashions, either surface mount or recessed mount. Dimensional
specications are shown below. When surface mounting, use a
#10 or larger screw. If recessed mounting, use a #6 screw.
There is a slot located at the bottom of the Reporter which
serves as access for the harness and power connections. Take
these into consideration when choosing the mounting location
for the Reporter. Circular dimensions are edge to center.
Aqua-Hot sheet metal cabinets have reference features
indented into them for mounting the Reporter to the Aqua-Hot
if desired.
Figure 67
Aqua-Hot Reporter
9.50”
8.125”
3.00”
Aqua-Hot Reporter
Boost Pumps
Boost pump functionality has changed with the
implementation of the Reporter 2.0.
On Reporter 1.0 units, any boost pumps at use within the
coach required a relay connected to wires 3b and 5b in order
to operate.
With Reporter 2.0, that relay can now be eliminated, with
boost pump power and functionality now being handled directly
by the Reporter. Using a ag-terminal, connect the boost pump
directly to the harness bearing in mind the requirements below.
• Zone 1: Connect to Wire 5b
Max Current Draw: 5.0A
Over-Current Condition: 8.0A
• Zone 2: Connect to Wire 3b
Max Current Draw: 3.0A
Over-Current Condition: 5.0A
Original Equipment Manufacturers (OEMs) will need to
provide the ground for operating boost pumps from the Reporter.
Electrical Specications:
The Reporter contains a single Amphenol ATP family
connector that serves as the power connection to the coach
side 12V DC power system. Mating connection components
are not supplied by Aqua-Hot. Compatible part numbers and
manufacturers are supplied below. The Reporter must be
operated to the below listed specications.
Minimum Voltage.....................................11.0V DC
Maximum Voltage....................................15.0 V DC
Minimum Current.....................................75mA
Maximum Current....................................15A
Please note that the minimum current rating is the minimum
requirement for what will operate the Reporter. Operating
at this current rating will not provide sufcient power to any
components dependent upon the Reporter.
Input Load currents
Zone Thermostats (each)..................................appx. 1mA
Diesel Burner Switch........................................ appx. 1mA
Electric Element Switch.................................... appx. 1mA
Low-Level Cutoff Switch.................................... appx. 1mA
Control Thermostat (Reporter 1.0)................... appx. 1mA
Tank Temperature Sensor (Reporter 2.0)........ appx. 1mA
Low-Temperature Cutoff Thermostat................ appx. 1mA
Output Load currents
Zone Fans (Reporter 1.0/all).................................3.0A max
Zone Fan 1 (Reporter 2.0)......................................8.0A max
Zone Fans 2-5 (Reporter 2.0).................................5.0A max
Zone Fans (all)......................................................0.25A max
Circulation Pumps (each).......................................2.0A max
AC Relay..................................................................0.5A max
Burner Power..........................................................6.0A max
RV-C Mating Connection
Mfg. Part Number Description
3M 37104-A165-OOE-MB RV-C Connection Housing
Reporter Power Connection
Pins
Housing
Wedge
Deuthsche Amphenol
1060-12-0222 AT60-12-0222
DTP04-2P ATP04-2P
WP-2P AWP-2P
Mfg.
TE
TE
3M
TE
TE
TE
Harness Connections
Mate
J1
J2
J3
J7
J8
J9
Part Number Description
1-480706-0 09P UMNL Plug
1-480710-0 15P UMNL Plug
37104-2165-000 FL
100
CONN Plug 2MM 4POS
20-22 AWG
1-480708-0 12P UMNL Plug
1-480704-0 06P UMNL Plug
640582-1 08P UMNL Plug
Mfg. Mate
TE
J1
J2
J3
J7
J8
J0
Sockets
Part Number Description
350550-1 UMNL SOK 20-14
TIN/PHBZ L/P
Mfg.
TE
Part Number
Socket Crimping Tool
90547-1
Description
ASSY Pro-Crimper M-N-L
Burner Master Control............................................2.0A max
Burner Thermostat Control....................................1.0A max
Connection Terminal Information
NOTE: For networked control of the Reporter, Aqua-
Hot requires system integrators ensure that individual
commands are received and processed. Aqua-Hot requires
that commands be repeated or conrmed so that if a
single message were dropped, or if there is a brief network
disturbance, the Reporter would get into the correct state as
soon as the disruption was removed.
The Aqua-Hot Reporter monitors the heating system and
handles all logic relating to safeties and heating control.
As such, the system integrator is required to display all
pertinent status information but not use that information to
lock out operation or add additional safety layers that could
impact the end of operation if a message from the Reporter
was missed.

Conguring the ZonesConguring the Zones
©Aqua-Hot® 450D Installation Manual REV 220504 ©Aqua-Hot® 450D Installation Manual REV 220504 p. 37p. 36
Figure 70
Aqua-Hot Reporter
Reporter
Figure 68
Figure 69
Reporter Bottom View
J8 J2 J7 J9 J3 J1Burner Power (+) RV-C Network
Indicator Light
Board Power
(Battery
Negative)
Board Power
(Battery
Positive)
Reporter Back Side
Manual Mode
LED Activity Status
Solid Green
Reporter is connected to
network and communicating
properly
OFF Reporter has no power, or
has failed completely
Solid Red
Reporter has gone ofine
and is not connected to
network
Flashing Green
(4/second)
Reporter is attempting to
make an initial connection to
the network
Flashing Green
(1/second)
The Reporter is online, but
it has not received a valid
network message for at least
5 seconds
Alternating Red and
Orange
Reporter has gone ofine
and is attempting to re-con-
nect (within 30 seconds)
Alternating Green
and Orange
Reporter is currently online
but has gone ofine 2 or
more times.
RV-C Network Connectivity
The Reporter was designed to interface with the coach-side
RV-C network to aid in the Aqua-Hot’s integration into the on-
board RV-C network.
There is an indicator light on the back of the Reporter which
shows the current status of the Reporter’s connection to the
RV-C network. This will be useful when diagnosing potential
problems with the coach-side RV-C network.
This mode can accessed under the test page of the Aqua-Hot
Reporter (see below).
Once the test page is open, select the MANUAL MODE and
select “NEXT”. Manual mode will continue to run for up to 3
days without any user intervention. Pressing the reset button
at any time while enabled will reset the timer, and run for an
additional 3 days.
All heating zones are linked together and can be run at 25%,
50%, 75%, and 100% (as shown below). The burner and electric
can be enabled or disabled. For all levels, there is a 10 minute
duty cycle period that will allow Cozy fans to be on for the
specied percentage of 10 minutes. Example, 25% would be on
for 2.5 minutes, and then off for 7.5 minutes. It always starts
with the on-cycle, then shuts off for the remainder of the 10
minute period.
If the system power is cycled, the manual mode will be disabled
and must be manually reactivated. Leaving the manual mode
page will also disable manual mode and restore normal
operation. Leaving manual mode should be done once the
system failure has been resolved and normal operation can
resume.
NOTE: If using the rocker switches, burner & electric switches
must be toggled on/off after leaving Manual Mode.
Figure 71
Figure 72
Figure 73
Manual Mode
The 2.0 Reporters with CFG 1.9 and greater come with a manual
mode in case the general coach RV-C network fails. It will allow
for limited operation while the larger network/module problem
is addressed.
To determine the version of Reporter, the Reporter 2.0 modules
are shipped with version decals afxed to the back of the circuit
board, OR shown on the home screen - “FW: 2.0”.