400LP - Aqua-Hot Heating Systems, Inc.

400LP - Aqua-Hot Heating Systems, Inc.
USE & CARE GUIDE
400
SERIES
400-LP
Section #: Title
Journey in Comfort
Thank you for equipping your RV with an Aqua-Hot hydronic heating system! We
value your business and are grateful for the trust you have placed with Aqua-Hot
Heating Systems Inc. Our customers are top priority and we are committed to
providing best-in-class products, service, and support.
We understand how important comfort is to you as a motor home owner; therefore, we have designed a heating system to significantly improve all of your comfort
levels while on the road. Additionally, the Aqua-Hot hydronic heating system is a low
emission, fuel efficient system that adds thousands of dollars to your motor home.
We know you must be eager to get underway, but take time to read the entire
Use & Care Guide and understand your Aqua-Hot unit. This guide should be maintained in legible condition and kept in a safe, accessible location for future review.
Should you have any suggestions how we can better serve you, please do not
hesitate to contact us at 800-685-4298 or 303-651-5500.
The Aqua-Hot hydronic heating system is protected by the finest warranty in the
industry (read it on page 19).
IMPORTANT NOTE:

A qualified installer or service technician must perform equipment installation
or service. Contact Aqua-Hot for Factory Authorized Service Centers or Certified
Technicians located near you: www.aquahot.com/ service-help: 800-685-4298
or 303-651-5500.

Warranty work must be performed by an Aqua-Hot Factory Authorized Service
Center.
IMPORTANT NOTE:

Your on-product identity label contains specifications of your unit. Factory settings may be adjusted by your RV manufacturer, confirm final setting with your
dealer.
WARNING:

If the information in this guide is not followed exactly, a fire or explosion may
result, causing property damage or personal injury.
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Section #: Title
Journey in Comfort
Comfort Zone #1: Comfortable Cabin Heat.
Get heat where you want it, when you want it! The Aqua-Hot system heats by zones. Therefore, your bedroom, living room, and
bathroom can be custom temperatures. Don’t hesitate to crank up the heat because the Aqua-Hot system doesn’t remove
moisture from the air. From now on, you will have to blame the dry skin and itchy eyes on Mother Nature!
Comfort Zone #2: Quiet Operation
Say goodbye to rude awakenings from the forced air furnace, you’re an Aqua-Hot owner now! The Aqua-Hot is quiet when operating, so you’ll never have to turn up the TV, yell across the room, or have an interrupted night of sleep again due to your
heating system.
Comfort Zone #3: Continuous, On-Demand Hot Water
Take long, guilt free showers knowing there is no recovery time for the next shower or load of laundry. The freedom to take a
shower when you want makes your RV experience feel much more like home.
Comfort Zone #4: Low Emissions
Aqua-Hot’s new low emission systems are fumeless and odorless. It’s good for you,
good for your neighbor, and good for the environment.
Comfort Zone #5: Over 160 Factory-Trained Service Centers
You won’t need to service your Aqua-Hot often, but when you do, you can be confident in our Certified Service Centers that are
close by and trained to assist you with all of your Aqua-Hot specific needs.
Comfort Zone #6: Adds Value
The NADA Recreational Vehicle Guide lists Aqua-Hot as adding thousands of dollars to the value of an RV. That value will pay
off when it’s time to trade up or sell.
Comfort Zone #7: Low Fuel Costs
There’s no need to burn propane each time heat or hot water is needed. Aqua-Hot’s TribridHot technology powers the AquaHot system by pulling heat from one or a combination of heat sources. When shore power is available, simply plug it in. When
dry-camping or in very cold conditions, use the Diesel Burner.
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Section #: Title
Safety Instructions & Precautions
The Unit
IMPORTANT NOTE: Read all instructions before installing
this appliance.

Read this Installation Manual before installing or using
the Aqua-Hot System to reduce the risk of injury to persons or damage to equipment.

The product identity label contains specifications of the
unit, to what standard it has been tested, and important safety notices.

The Aqua-Hot must be installed in a compartment that
is closed off from living quarters and accessible only
from outdoors.

Propylene glycol based antifreeze “Generally Recognized as Safe” by the FDA must be utilized for antifreeze and water heating solution.


An interlock switch prevents the Aqua-Hot heater from
operating when the cover is not installed in the correct
position.

Disconnect electric wiring to the Aqua-Hot System before welding or plasma cutting the coach to avoid damage to equipment.

Air pressure to the tank must not exceed 20 PSI or will
cause internal damage.

The Aqua-Hot’s exhaust is HOT and must be kept away
from heat sensitive material.

Use caution when working on or near the propane gas
system.

DO NOT connect the 12 Volt-DC power to the Aqua-Hot
if the vehicle requires welding.

At maximum operating temperatures, the coolant will
be very hot and scalding hot vapor or coolant may result in serious burns or injury.

DO NOT activate the burner until the antifreeze and
water heating solution has been added to the boiler
tank to avoid serious damage to the heater.

Do not start the vehicle’s engine or electric generator.

Contact the nearest gas supplier or qualified service
technician for repairs.

If you cannot reach a gas supplier or qualified service
technician, contact the nearest fire department.

Do not turn on the gas supply until the gas leak(s) has
been repaired.

Installation and service must be performed by a qualified installer, service agency, or gas supplier.
Should any additional assistance be needed, please
contact the Product Application Department at 800685-4298 or 303-651-5500.
If this information in these instructions is not followed
exactly, a fire or explosion may result causing property
damage, personal injury, or death.

CAUTION:
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS

Evacuate all persons from the vehicle.

Shut off the gas supply at the gas container or source.

Do not touch any electrical switch or use any phone or
radio in the vehicle.
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Section #: Title
Safety Instruction & Precautions
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Section #: Title
Contents and Cautions
Contents
Introduction
About the Aqua-Hot Hydronic Heating System ..................... 5
Aqua-Hot Hydronic Heating System Reference .................... 6
Operating Instructions
Activating the Aqua-Hot Heating System .............................. 7
Operating Safety Information ................................................ 8
Operating Zone Thermostats ................................................. 9
Using the Domestic Water Heating System .......................... 9
Aqua-Hot Operational Flow Chart ........................................10
Troubleshooting
General Information .............................................................11
Electronic Controller Diagnosis ...........................................11
Tempering Valve ..................................................................12
Maintenance
Monthly Maintenance ..........................................................13
Replenishing the Antifreeze/Water Solution ......................13
Annual Maintenance ............................................................13
Winterization
Winterizing the Domestic Water Heating System ..............14
De-Winterizing the Domestic Water Heating System .........14
Appendices
Appendix A: Antifreeze Types ..............................................15
Appendix B: Antifreeze Mixture/Water Quality ...................15
Appendix C: Antifreeze Terms and Mixture Ratio ...............15
Appendix D: Measuring Propylene Glycol
Using a Refractometer ....................................17
Owner’s Service Log ..........................................................18
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 efficient use of
the Aqua-Hot equipment.
NOTICE signals a situation where potential damage to the equipment 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 you do not follow instructions
DANGER signals a situation where immediate risk
of serious injury or death will result if you do not
follow instructions
NOTE: In addition, this manual may indicate an
IMPORTANT NOTE that highlights information that
is especially important.
Warranty
Limited Warranty Statement ...............................................20
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Section #: Title
Aqua-Hot System Features
400-LP Features
The product label
attached to the
Aqua-Hot
provides a ready
reference to
specifications, test
standards and
important safety
notices.
The Aqua-Hot Heating System is a Low Emissions Hydronic Heating System (heating with hot water) that significantly improves your level of comfort, decreases harmful
emissions released into the atmosphere, and adds thousands of dollars in value to your RV.
The Aqua-Hot Heating System is three systems in one:
1. Interior Heating System: provides quiet, comfortable
interior heat with independent temperature zones that
provide cabin-wide even temperatures.
2. Bay Heating System: keeps pipes and tanks from freezing in the bay storage area.
3. Tank-less Hot Water System: provides a steady flow of
continuous hot water.
The Aqua-Hot System is powered by TribridHot™ technology
and uses one or a combination of the following sources:
1. The 120-Volt AC Electric Element: When plugged into
shore power, the electric element lets you use the power you are already paying for to provide heat and meet
your light duty hot water needs.
2. The Burner: This is the Aqua-Hot’s most powerful heat
source and provides all of heating and hot water needs
in cold temperatures or dry camping.
NOTE: This Aqua-Hot product utilizes a propylene glycol
based antifreeze and water heating solution. This propylene
glycol based solution is a boiler type antifreeze that is
“Generally Recognized as Safe” (GRAS) by the FDA. For
additional information regarding this “GRAS” antifreeze
product, please the Care & Maintenance Section of this
guide, contact the Aqua-Hot Heating Systems Technical
Support Department at 1-800-685-4298, or visit the web
site at www.aquahot.com.
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Section #: Title
Aqua-Hot System Features
Cut-Away Diagrams
13
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2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
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19.
20.
21.
8
17
1
16
7
6
11
18
20
AC Terminal Block
AC Terminal Port
AC Wiring Port
Access Cover
Air Release Valve
Propane Burner
Propane Burner Controllers
Propane Inlet Ball Valve
Domestic Cold Water Inlet
Domestic Hot Water Outlet
Drain Valve
Expansion Tank Connection
Heating Zone 1 Outlet Port
Heating Zone 2 Outlet Port
Tempering Valve
VAC Access Panel
Wiring and Harness Port
Zone 1 Circulation Pump
Zone 1 Inlet Port
Zone 2 Circulation Pump
Zone 2 Inlet Port
5
3
21
12
19
4
15
9
10
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.
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Section #: Title
Aqua-Hot Heating System Features
Controls Overview
Do not operate the diesel-burner and/or electric element
without the antifreeze and water heating solution in the
Aqua-Hot’s boiler tank. Failure to do so will cause serious
damage to the heater.
Switches:
Thermostats:
The interior room thermostat can be set at the desired
temperature; therefore, whenever the interior of the room
“calls for heat”, the Aqua-Hot’s circulation pump and interior heat exchanger fans will be activated. The fresh water
thermostat controls the bay heating area and should NOT
be set below 40°F, to prevent freezing of the domestic
water storage system. Please contact the specific motor
home dealer for exact location of thermostat controls.
The Aqua-Hot heating system is controlled by two switches, the burner switch and the electric element switch. When
one or both the burner or electric element switches are in
the ON position, it will supply the necessary heat to the boiler tank. Keep in mind that the Aqua-Hot must be at operating temperature for the heating zones and hot water to
function properly. Please contact the specific motorhome
dealer for the exact location of switch operations.
Interior Heating Operation
Heating Operation
Overview:
Controlling Heat Levels:
The heating features are powered by a 12 Volt-DC propane burner and a 120 Volt-AC electric heating element.
These two heating elements maintain the temperature of
the Aqua-Hot’s antifreeze and water heating solution to provide hot water and heat to the motor home.
The interior room thermostat can be adjusted at the
desired temperature and will automatically be activated to
maintain the temperature of the interior. Keep in mind that
the diesel and/or electric element switch on the interior
switch panel must be in the ON position for the heat to operate.


Propane Burner– The propane burner is the Aqua-Hot’s
primary and most powerful heat source and provides
all of the heating and hot water needs when cold temperatures exist and/or when there is a high demand for
hot water. It can be activated by turning the burner
switch in the ON position. Reference Figure 1 on following page.
Control/Balancing Heating Zones:
Set the interior room thermostat for each independent
heating zone at the desired temperature. This feature allows you to customize various temperatures on each heating zone throughout your motor home.
Electric– The electric element is the Aqua-Hot’s secondary heat source and can be used when plugged into
shore power. The electric element provides heat when
moderate temperatures exist (50°F or higher) and/or
when there is a low demand for hot water. It can be
activated by turning the electric switch in the ON position. Reference Figure 1 on following page.
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Section #: Title
Hot Water Operation
Using the Water Heating System
General Information:
Operation Instructions:
The Aqua-Hot system is known as an on-demand hot
water heating system because hot water is not stored within
the motor home. Instead, when the burner and/or electric
element switch is ON and the Aqua-Hot is at operating temperature, the water is automatically heated as it is being
used. Therefore, simply open an hot water faucet once system is up to operating temperature, and a continuous supply of hot water will be present within a few seconds.
To operate the Aqua-Hot hot water system, you will need
to locate the interior switch panel located inside your motor
home. If you are unable to locate the switch panel, contact
your dealer to guide you in the location and operation of all
switch operations. Once you have located the interior switch
panel, turn the burner switch ON. This action will activate
the burner and the indicator light located adjacent to the
burner switch. Allow 10-20 minutes for the Aqua-Hot system
to reach operating temperature. Please note that the burner
is the primary heat source for heating the interior and hot
water.
To operate the electric heating element, turn the electric
switch ON. This action will activate the 12 Volt-AC electric
heating element and the indicator light located adjacent to
the electric switch. Allow 1-2 hours for the Aqua-Hot system
to reach operating temperature. Be sure to activate the
electric element switch for maximum water capacity. Figure
1 is an example of an interior switch panel.
Do not operate the burner and/or electric element without
the antifreeze and water heating solution in the Aqua-Hot’s
boiler tank. Failure to do so will cause serious damage to
the heater.
The Aqua-Hot’s exhaust is HOT! Do NOT park is areas where
dry conditions exist (i.e., grassy, dry fields). Do NOT operate
the burner inside an enclosed building. The heater must be
switched OFF when refueling.
Figure 1
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Section #: Title
Operating Instructions
Aqua-Hot Operational Flowchart
Heat source is selected from the Interior
Switch Panel.
Burner is activated by the
Burner switch.
Electric Heating Element is
activated by the Electric
switch.
The Boiler Tank heats the
antifreeze and water heating solution to 190°F.
Heating Zone Thermostat
calls for heat.
The heated antifreeze and
water heating solution flows
through the Hydronic Heating System transferring
heat to the heat exchanger,
which is then transferred to
the surrounding zone.
A hot water faucet (e.g., kitchen
sink, shower, etc.) is opened.
Continuous hot water is supplied
to the faucet.
The cooled antifreeze and water
heating solution is returned to the
boiler tank to be reheated.
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Section #: Title
Maintenance
Maintenance Schedule
Monthly Maintenance
Check the Aqua-Hot’s antifreeze and water heating solution to ensure that it is at the proper level. This can be accomplished by visually checking the coolant level in the Aqua-Hot’s Expansion Tank; reference Figure 3.
Please note that the coolant level should be checked
ONLY when the Aqua-Hot is at maximum operating temperature. This should be done IMMEDIATELY after the Burner
cycles OFF.
At maximum operating temperature, the antifreeze and
water heating solution should be at the level marked “HOT”
on the Expansion Tank.
Run the interior heating zones until you feel warm air
blowing out the heat exchangers. This will prevent the zone
check valves from failing prematurely.
Run the Burner once a month. This will ensure proper
operation of the Burner.
Replenishing the Antifreeze and Water
Heating Solution
If the antifreeze and water heating solution needs replenishing, remove the Expansion Tank’s cap and fill the
Expansion Tank to the “HOT” level mark.
When refilling, open the Air Release Valve located on the
Expansion Tank to release air pockets; reference page 6
(part #5 and #12). Hold the valve open until all the air is
released. If necessary, refill the Expansion Tank again. Be
sure the valve is closed when finished by hand-tightening.
Reference Appendix A through C in order to determine the
correct ratio antifreeze to water, the proper type of antifreeze, and the water quality recommendations for the Aqua
-Hot Hydronic Heating System’s antifreeze and water heating solution. Reference Appendix D for the proper tool and
instructions for usage in measuring the system’s antifreeze
mixture ratio.
When the Aqua-Hot is at maximum operating temperature,
the coolant will be very HOT! If the Aqua-Hot’s heating system is accessed, scalding by hot vapor or coolant could
result. Before cleaning or servicing, disconnect all power
supplies.
DO NOT operate the Burner and/or the Electric Heating
Element without the antifreeze and water heating solution
in the Aqua-Hot’s Boiler Tank. Doing so will cause serious
damage to the heater.
Propylene glycol that is “Generally Recognized as Safe” by
the FDA must be utilized for the antifreeze and water heat
solution.
NOTE: For additional information regarding this propylene
glycol-based, boiler-type antifreeze that has been “Generally
Recognized as Safe” by the FDA, please reference Appendix
A, contact Aqua-Hot Heating Systems Technical Support
Department at 1-800-685-4298, or visit the web site at
www.aquahot.com.
Figure 3
Expansion Tank
Cap
Fluid will reach
Expansion Tank
line when HOT
Annual Maintenance
No annual maintenance is required above the normal
monthly maintenance. Reference the Aqua-Hot’s Service
and Parts manual for spare parts information and detailed
replacement instructions. Contact the Aqua-Hot Heating
Systems Technical Support Department at 1-800-685-4298
for assistance. Otherwise, locate the nearest Aqua-Hot Service Center, or visit the web site at www.aquahot.com.
© Aqua-Hot® 400-LP Use & Care Guide
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Section #: Title
Winterization
Winterizing the Domestic Water Heating System:
The Aqua-Hot’s Domestic Water Heating System must be
completely drained of domestic water at ANY time the heater is stored where freezing temperatures may be experienced.
Please follow these instructions when winterizing the
NOTE: The Aqua-Hot can continue to be used for interior
zone heating once the domestic water heating system has
been drained and winterized.
Aqua-Hot’s Domestic Water Heating System; reference Figure 4.
1. Completely drain the fresh water storage tank.
2. Disconnect the domestic water demand pump’s suction
line from the fresh water storage tank.
3. Attach an adequate piece of hose onto the suction side
of the domestic water demand pump.
4. Place the opposite end of the hose into an adequate
supply of FDA-approved “GRAS” RV antifreeze and allow
this to pump through.
5. Open and close all interior and exterior water faucets,
one at a time, until ONLY pure RV antifreeze is present.
Perform this procedure for both hot and cold faucets.
6. Remove the hose and reconnect the domestic water
demand pump’s suction line to the fresh water storage
tank.
Not winterizing the Aqua-Hot when freezing temperature
are present will result in SERIOUS damage to the AquaHot’s Domestic Water Heating System. Also, be sure to use
the FDA approved, “GRAS” rated antifreeze for winterization.
De-Winterization:
To de-winterize the Aqua-Hot system, completely fill the
fresh water storage tank. Open and close the interior and
exterior faucets, one at a time, until only clear water is present.
Disinfecting the Domestic Water System:
Aqua-Hot systems contain copper tubing and are not compatible to prolonged exposure to sodium hypochlorite
(bleach or liquid bleach). Using products containing bleach,
including water refreshers, may cause corrosion of the
domestic water coil, resulting in a catastrophic failure of
the Aqua-Hot system by creating leaks that cannot be
repaired. This damage is not covered by the Aqua-Hot warranty.
If disinfecting the hot water heating system be sure to follow
NFPA 1192 Standard on Recreational Vehicles’ “Instructions
for Disinfection of Potable Water Systems.” These instructions can be found by visiting the National Fire Protection
Association online at www.nfpa.org.
Figure 4
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Section #: Title
Appendices A, B, and C
Appendix A: Antifreeze Types
Appendix B: Antifreeze Mixture Water
Quality Recommendations
The following information addresses the necessary usage of propylene glycol based “boiler” type antifreeze in the
Aqua-Hot. Propylene glycol is a safer alternative to the more
toxic ethylene glycol antifreeze; however, as mandated by
IAPMO (International Association Plumbing and Mechanical
Officials), only propylene glycol based “boiler” type antifreezes deemed “Generally Recognized as Safe” (GRAS) by the
FDA should be utilized.
Due to the significant impact of various types of antifreeze on a hydronic heating system, including the level of
safety provided, it has been recognized that there is a need
to provide an explanation regarding two additional prominent types of antifreeze/coolant available. The following
information should be utilized as an educational means of
ensuring that the proper type of propylene glycol based antifreeze is selected.
In order to ensure maximum performance and longevity
of an Aqua-Hot heating system’s boiler tank and associated
components, it has been determined that there is a need to
use distilled, de-ionized, or soft water in combination with
concentrated propylene glycol for the Aqua-Hot’s anti freeze
and water heating solution. Please not that this is only necessary when mixing concentrated propylene glycol antifreeze with water; suppliers of pre-mixed antifreeze are responsible for the use of high-quality (distilled, de-ionized, or
soft) water when preparing their antifreeze for sale.
Hard water posses a high-level of calcium and magnesium ions, which deplete the propylene glycol antifreeze’s
corrosion inhibitors. This causes the antifreeze and water
heating solution to begin turning acidic, which can corrode
the Aqua-Hot’s Boiler tank and associated components
prematurely. Therefore, concentrated propylene glycol
should be diluted with distilled, de-ionized, or soft water
which is 80 ppm or less in total hardness. The local water
agency should have up-to-date water quality reports which
should indicate if the local tap water is within this guideline.
RV & Marine Antifreeze:
These types of propylene glycol based antifreeze products are formulated specifically for “winterizing” application
ONLY. Although RV & Marine antifreeze is often “ Generally
Recognized as Safe” by the FDA, it should never be used in
the Aqua-Hot’s Hydronic Heating System. This typed of antifreeze is not formulated to transfer heat, which is essential
to the heating system’s functionality and does not contain
rust inhibitors. Please note the RV & Marine antifreeze can
be utilized to winterize the Aqua-Hot’s Domestic Hot Water
Heating System.
Automotive Antifreeze/Coolant:
These types of propylene glycol based antifreeze products are formulated specifically to protect automotive engines against corrosion, freezing temperatures, and overheating. They also have excellent heat transfer and thermal
conductivity characteristic. Although these types of antifreeze products are considered less toxic and safer than
ethylene glycol for people, pets, and the environment, they
are not “Generally Recognized as Safe” (GRAS) rated by the
FDA. Therefore, they must be marked with a “harmful if
swallowed” warning. This additional warning is required because these types of antifreeze products contain high levels
of chemical rust inhibitors. Due to their potentially hazard
properties, they should never be used in Aqua-Hot’s Hydronic Heating System.
Appendix C: Antifreeze Terms and Mixture
Ratio
The following information addresses the process of selecting a propylene glycol based antifreeze solution that
provides adequate freeze, boiling, and rust/anticorrosive
protection. A 50/50 mixture ration is recommended, which
will result in a freeze point of approximately -28°F and a
boil point of approximately 222°F.
The following information should be utilized for the purpose of clarifying some terms commonly associated with
antifreeze.
Freeze Point and Burst Point:
Antifreeze solution lowers the freezing point of any liquid
to which it has been added by preventing the formation of
crystals. However, as the ambient temperature continues to
decline, the water in the solution will attempt to attain a
solid state. The point in which the water begins to solidify is
termed by the “freeze point”. Although the water in the solution has begun to freeze, producing a “slushy” consistency,
the antifreeze in the solution will continue to combat the
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Section #: Title
Appendix C (Continued)
Appendix C: Antifreeze Terms and Mixture Ratio
normal expansion of the solution as it freezes. The point in
which the solution can begin to expand, due to colder temperatures, is called the “Burst Point”. Once the solution
reaches the burst point, the potential is present for ruptured
pipes to exist. The burst point of the antifreeze and the water heating solution is dependent upon the brand of propylene glycol antifreeze employed.
Boiling Point:
The Aqua-Hot utilizes the propylene glycol based (PPG)
antifreeze and water heating solution as a transportation
means for the heat produced from the internal processes.
The PPG antifreeze solution absorbs the heat created until
its boiling point is reached. It is at this point when the liquid
turns to a gas and is expelled to prevent the heating system
from overheating. Each time the boiling point is reached, a
loss of efficiency occurs because the heat produced is expelled rather than utilized for the function of the heating
system. Therefore, a higher boiling point is desired in order
to combat the loss of efficiency, which allows the antifreeze
to transport the heat created from the internal process
throughout the motorhome where it can be utilized productively rather than dissipating due to its change from a liquid
to a gas.
Summary:
Antifreeze solution has three basic functions:
1. Freeze Protection
2. Boil-over Protection
3. Anti-Corrosion and Rust Protection
PPG Antifreeze solution is also primarily responsible for
heat transfer; however, propylene glycol itself does not posses acceptable heat transfer characteristics. Therefore, water is added to the mixture because it is an excellent heat
conductor. PPG antifreeze solution, mixed with water that is
35% to 50% propylene glycol is recommended to provide
the best performance combination of the aforementioned
functions. If excess propylene glycol exists within an antifreeze and water heating solution, the water’s heat absorption properties are compromised. This could ultimately inhibit the Aqua-Hot from providing adequate domestic hot
water and interior heating.
Additionally, if the antifreeze and water heating solution
contains over 70% propylene glycol, the freezing point is
actually raised, resulting in less freeze protection. Please
reference the attached graphical representation regarding
the percentage of antifreeze to water and how it directly
affects the solution’s freezing point.
Rust and Anti-Corrosive Inhibitors:
Another major function of antifreeze solution is to provide protecting
to the internal metal components of
the Aqua-Hot hydronic heating system
from corrosion and rust. Antifreeze is
able to perform this function by the
addition of rust and anti-corrosive
inhibitors, which are designed specifically to activate in a water solution.
© Aqua-Hot® 400-LP Use & Care Guide
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Section #: Title
Appendix D
Measuring Propylene Glycol Using a Refractometer
Calibrate the Refractometer
Aqua-Hot Part Number MSX-907-162
Calibration Screw
Eyepiece
Daylight Plate
Assembly
Main Prism
Assembly
Calibration Operation
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Section #: Title
Troubleshooting
General Information
Should the Aqua-Hot Hydronic Heating System fail to
operate, complete the following checks:
1. Verify that the Aqua-Hot’s access cover is securely installed. Reference page 6 (part #4). The Aqua-Hot Hydronic Heating System will not operate if the access
cover is not fully installed.
2. Ensure that the vehicle’s fuel tank contains a sufficient
level of fuel. The Aqua-Hot system will not operate if
the fuel level is at or below 1/4 tank.
3. Ensure that the Aqua-Hot’s boiler tank has an adequate supply of antifreeze and water heating solution
by checking the level at the Expansion Tank. If the level
is low, reference the Maintenance section of this guide
for refilling instructions.
4. Check the Aqua-Hot’s electronic controller for any RED
lights indicating a fault condition.
If the Aqua-Hot Heating System’s failure to operate is
not resolved with the aforementioned checks, please contact the Aqua-Hot Heating Systems Technical Support Department at 1-800-685-4298 for additional assistance or
visit the web site at www.aquahot.com.
If the Aqua-Hot’s Burner switch “Indicator Light” does
not illuminate and the Burner is not functioning, locate the
electronic controller and check the following:
1. Check the Aqua-Hot’s electronic controller for any RED
lights indicating a fault condition. Reference Figure 2.
2. Check for loose wire connections on the electric controller’s terminal strips/plugs. When checking for loose
terminal strips/plugs, remove the electronic controller
faceplate by unscrewing the four cover screws.
3. Remove the Aqua-Hot’s access cover and check for
loose plug connections on the Burner controller unit.
Reference page 6 (part #7).
NOTE: An interlock switch prevents the Aqua-Hot from operating when the cover is not installed and properly in
place.
4. Ensure the vehicle’s fuel tank has a sufficient level of
fuel.
5. If the Aqua-Hot still fails to operate, please contact the
Aqua-Hot Heating Systems Technical Support Department at 1-800-685-4298 or visit the web site at
www.aquahot.com.
Electronic Controller Diagnosis
Low Tank-Level Cutoff Indicator Light:
This indicator light will illuminate RED when either the
120 Volt-AC electric heating element and/or Burner have
automatically shut down due to low antifreeze and water
heating solution level inside the Aqua-Hot’s boiler tank. This
fault will automatically reset when the low level condition is
corrected.
Low Battery Voltage Fault Indicator Light:
This indicator light will illuminate RED and the Burner will
shut down whenever the 12 Volt-DC voltage level is too low
for the Aqua-Hot to operate properly. This fault must be
manually reset after the voltage level has been restored to
the 12 Volt-DC battery system. Reference “Low Voltage Fault
Indicator Light and Reset Button” information below.
Low Voltage Fault Indicator Light and Reset Button:
The Aqua-Hot’s electronic controller must be manually
reset whenever the low battery voltage fault indicator light
has been activated.
The electric controller can be reset by turning OFF the
Burner switch on the interior switch panel for approximately
60 seconds, then turning the switch back ON by pressing
the “Low Voltage Reset” button located on the electric controller (use a thin, straight, non-metallic object to access the
reset button through the small hole on the faceplate).
Overload Fault Indicator Light:
This indicator light will illuminate RED whenever one of
the following conditions have occurred:
1. The Aqua-Hot is off due to an electrical overload (i.e.,
short) in the main 12 Volt-DC power supply circuitry.
2. The Aqua-Hot is off due to a combination of high electrical 12 Volt-DC power loads and a high surface temperature of the electronic controller.
The Aqua-Hot will automatically restart once the electoral overload (i.e., short) and/or high-heat condition is corrected.
© Aqua-Hot® 400-LP Use & Care Guide
p. 17
Section #: Title
Troubleshooting
Heating Zones Status Indicator Lights:
These five indicator lights (separately) will illuminate
GREEN whenever a zone thermostat, for each particular
zone, is calling for heat. The GREEN indicator lights also
indicate that 12 Volt-DC power is being supplied to the particular interior heating zone’s heat exchangers (i.e., fan
motors).
If any of the five indicator lights illuminate RED, it indicates that an electrical overload condition (i.e., short) has
occurred in a particular heating zone’s circuitry.
NOTE: The Low Temp Cutoff Light must be illuminated and
the heater must be up to operating temperature for the
heating zone status indicator lights to illuminate red or
green.
Pumps #1, #2, and #3 Indicator Lights:
These indicator lights (separately) will illuminate GREEN
whenever a circulation pump is operating. If any of the
three indicator lights illuminate RED, it indicates that an
electrical overload condition (i.e., short) has occurred in the
particular component’s circuitry.
NOTE: Zone circulation pumps #1 and #2 are activated
whenever a zone thermostat “calls for heat”. The #3 boiler
tank stir pump is activated whenever the domestic water is
being used on a continuous basis or the heater is not up to
operating temperature.
NOTE: The Aqua-Hot’s VDC/VAC Control Thermostat will
automatically activate the Burner and/or the electric heating element ONLY if the Burner and/or electric element
switch is in the ON position.
Tempering Valve
The Tempering Valve for the Aqua-Hot mixes the heated
domestic water from the boiler tank with cold domestic water at the present ratio to reduce the risk of scalding. This
valve is located in the back of the Aqua-Hot unit. Reference
page 6 (part #15).
Locate the pink paint witness mark to verify that the Aqua-Hot is set at the correct factory setting and did not get
tampered with during shipping or installation.
Verify that the Tempering Valve is set at the proper temperature by using a digital thermometer at one of the hot
water faucets. The water temperature should range between 115°F to 123°F. If the correct temperature cannot be
set, follow the instructions to replace the Tempering Valve in
Section 5 of the Service Manual.
Figure 2
Electric Heating Element Status Indicator Light:
This indicator light will illuminate GREEN whenever the
Aqua-Hot’s electric heating element is operating and
providing heat to the Aqua-Hot’s boiler tank.
Please note that this light will only be active if the electric element switch is ON. If this indicator light illuminates
RED, it indicates an electrical overload condition (i.e., short)
has occurred in the electric heating element’s 12 Volt-DC.
© Aqua-Hot® 400-LP Use & Care Guide
p. 18
Section #: Title
Owner’s Service Log
DATE
SERVICE PERFORMED
SERVICE CENTER
© Aqua-Hot® 400-LP Use & Care Guide
p. 19
Section #: Title
Owner’s Service Log
DATE
SERVICE PERFORMED
SERVICE CENTER
© Aqua-Hot® 400-LP Use & Care Guide
p. 20
Warranty
2-YEAR LIMITED WARRANTY AQUA-HOT®
HYDRONIC HEATING SYSTEM
Aqua-Hot Heating Systems Inc. warrants the Aqua-Hot Heater to be free from defects in material
and workmanship under normal use and service for a period of two years on both parts and
labor commencing upon the original date of registration of the vehicle. Replacement parts are
warranted for the remainder of the Heater’s standard warranty coverage or for six months,
whichever is greater. The intent of this warranty is to protect the Heater’s end-user from such
defects, which would occur in the manufacturing of the product. Thus, problems due to
improper specifications, improper installations, improper use, the use of accessory parts or
parts not authorized by Aqua-Hot Heating Systems Inc., repair by unauthorized persons, and
damage or abuse of the Heater are specially excluded from warranty coverage.
For additional information or to obtain a warranty repair authorization, please contact the
Aqua-Hot Heating Systems Warranty Administrator at 1-800-685-4298 (8:00 AM to 5:00 PM
Mountain Standard Time) or visit www.aquahot.com.
My Comfort Zones are On-Board
Vehicle:
Purchased From:
Dealer Information:
Name:
Location:
Phone Number:
Heating System:
Serial Number:
LTE-400-000 Rev. A
400
SERIES
400-LP
7501 Miller Drive, Frederick, CO 80504
Visit us on line at www.aquahot.com
Call us at (800) 685-4298 or (303) 651-5500
©2013 Aqua-Hot Heating Systems Inc. Printed In U.S.A.
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