Aqua-Hot 600 SERIES Use & Care Manual

USE & CARE GUIDE

400

SERIES

450-D

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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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 Aqua-

Hot 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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Contents

Safety Instructions & Precautions --------------------------------------- 5

Aqua-Hot Heating System Features

450-D ------------------------------------------------------------------------------- 6

Cut-Away Diagrams ---------------------------------------------------------- 7

Controls Overview

Switches ----------------------------------------------------------------------- 8

Thermostats ----------------------------------------------------------------- 8

Interior Heating Operation

Heating Operation ------------------------------------------------------------ 8

Controlling Heat Levels ---------------------------------------------------- 8

Control/Balancing Heating Zones ----------------------------------- 8

Hot Water Operation

Using the Water Heating System

General Information ---------------------------------------------------- 9

Operation Instructions ----------------------------------------------- 9

Operational Flowchart --------------------------------------------------------- 10

Care and Maintenance

Overview ------------------------------------------------------------------------- 11

Monthly --------------------------------------------------------------------------- 11

Annual ----------------------------------------------------------------------------- 11

Winterization------------------------------------------------------------------- 11

Disinfecting the Hot Water Heating System ----------------- 11

Fluids

Types -------------------------------------------------------------------------- 12

Mixture Recommendations -------------------------------------- 12

Mixture Ratios ----------------------------------------------------------- 13

Using a Refractometer ---------------------------------------------- 14

Trouble Shooting Guide

General Information ------------------------------------------------------- 15

Electronic Diagnosis ------------------------------------------------- 15-16

Tempering Valve ------------------------------------------------------------- 16

Owner’s Service Log ------------------------------------------------------ 17-18

Aqua-Hot Warranty -------------------------------------------------------------- 19

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.

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Section #: Title

Safety Instructions & Precautions

The Unit

IMPORATANT NOTE: Read all instructions before using this appliance.



Read this Use & Care Guide before using your Aqua-Hot

Heating System to reduce the risk of injury to persons or damage to equipment.



Have your dealer show you the location and operation of all switch operations and valve settings.



Do not repair or service the system, unless specifically recommended in the literature accompanying the Aqua-

Hot product. All service should be referred to a qualified technician.



An interlock switch prevents the Aqua-Hot heater from operating when the cover is not installed in the correct position.



Propylene glycol based antifreeze, “Generally Recognized as Safe” by the FDA, must be utilized for antifreeze and water heating solution.



Interior heat can still be used once the water heating system has been drained and winterized.



Use propylene glycol “Generally Recognized as Safe” RV and Marine antifreeze specifically for “winterizing” application ONLY.

CAUTION:



The hot water temperature is set at the mixing valve to

120°F/ 48.9°C at the factory.



DO winterize the heating system when freezing temperatures are expected to avoid serious damage to the hot water system.



DO NOT operate the burner or electric heating element without antifreeze or water heating solution in the boiler tank to avoid damage to the heater.



Aqua-Hot’s exhaust is hot. DO NOT park in dry areas when operating to avoid fire and injury to persons.



At maximum operating temperatures, the coolant will be very hot and scalding hot vapor or coolant may result in serious burns or injury.



Before cleaning or servicing, disconnect all power supplies.



The heater must be switched OFF when refueling.



DO NOT operate the Aqua-Hot’s diesel-burner inside an enclosed building.

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450-D Features

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 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.

4. Engine Preheating System: reduces engine wear caused by cold starting by preheating the engine from

30°F to 90°F in one hour.

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 Diesel 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.

3. The Vehicle’s Engine: When driving or idling, the engines surplus heat is transferred to the Aqua-Hot providing interior heat and limited hot water without burning any other fuel.

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 reference 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.

NOTE: Service parts and accessories are available through

Aqua-Hot Factory Authorized Service Center or at www.aquahot.com.

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The product label attached to the

Aqua-Hot provides a ready reference to specifications, test standards, and important safety notices. p.

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Cut-Away Diagrams

8

2

1

20

23

16

22

17

24

21

11

6

3

25

7

14

18

5

15

1. AC Terminal Block

2. AC Terminal Port

3. AC Wiring Port

4. Access Cover

5. Air Release Valve

6. Diesel Burner

7. Diesel Burner Controller

8. Diesel Fuel Inlet/Outlet Ports

9. Domestic Cold Water Inlet

10. Domestic Hot Water Outlet

11. Drain Valve

12. Engine Preheat Circulation Pump

13. Engine Preheat Inlet (From Engine)

14. Engine Preheat Outlet (To Engine)

15. Expansion Tank Connection

16. Heating Zone 1 Outlet Port

17. Heating Zone 2 Outlet Port

18. Interlock Switch

19. Tempering Valve

20. AC Junction Box

21. Wiring and Harness Port

22. Zone 1 Circulation Pump

23. Zone 1 Inlet Port

24. Zone 2 Circulation Pump

25. Zone 2 Inlet Port

19

10

9

4

12

14

4

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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:

The Aqua-Hot heating system is controlled by two switches, the burner switch and the electric element switch. This style of Aqua-Hot is equipped with an Engine Preheat element as well. 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.

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.

Interior Heating Operation

Heating Operation

Overview:

The heating features are powered by a 12 Volt-DC dieselburner 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.



Diesel– The diesel-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.



Electric– The electric element is the Aqua-Hot’s second-

ary 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.



Engine Preheat- In order to use the Engine Preheat element on the Aqua-Hot system, both the dieselburner AND the engine preheat switch must be turned

ON. Allow the engine preheat element to function for one hour before starting the vehicle's engine. Reference Figure 1 on following page.

Controlling Heat Levels:

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.

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.

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Using the Water Heating System

General Information:

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.

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.

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 diesel-burner inside an enclosed building. The heater must be switched OFF when refueling.

Operation Instructions:

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 diesel-burner and the indicator light located adjacent to the diesel-burner switch. Allow 10-20 minutes for the Aqua-

Hot system to reach operating temperature. Please note that the diesel-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.

Figure 1

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Section #: Title

Operational Flowchart

Heat source is selected from the

Interior Switch Panel.

Diesel-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.

“Engine Preheat” switch on the Interior Switch Panel is activated.

A hot water faucet (e.g., kitchen sink, shower, etc.) is opened.

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.

The engine’s coolant is circulated through the Aqua-Hot’s internal Engine Preheat System, where the heat from the

Boiler Tank is transferred to the engine’s coolant.

The cooled antifreeze and water heating solution is returned to the boiler tank to be reheated.

Continuous hot water is supplied to the faucet.

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Overview:

The Aqua-Hot system requires minimal maintenance if monthly, annual, and proper winterization procedures are followed accurately. It is extremely important to follow the instructions below precisely and carefully to receive the best results and promote the longevity of your Aqua-Hot. Monthly maintenance to the Aqua-Hot requires a visual check of the antifreeze and water solution to make sure it’s at the correct operating level. Annual maintenance to the Aqua-Hot requires a replacement of two parts on the diesel-burner, the fuel nozzle and fuel filter. Winterization of an Aqua-Hot system prepares a motor home for storage during the winter months to prevent freezing pipes and other critical damage.

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 hot vapor or coolant could result.

Before cleaning or servicing, disconnect all power supplies.

Monthly:

It is extremely important to check the Aqua-Hot’s antifreeze and water heating solution to ensure it is at the proper level for operation. This task can be done by visibly checking the coolant level in the Aqua-Hot’s expansion tank. At maximum operating temperature, the antifreeze and water heating solution should be at the level marked “HOT” on the expansion tank. The coolant level should be checked ONLY when the Aqua-Hot is at maximum operating temperature.

Therefore, this procedure should be done immediately after the diesel-burner cycles OFF. Reference figure below. If it needs refilling, reference “Fluids” in the Care & Maintenance section.

Expansion Tank

Cap

Fluid will reach

Expansion Tank line when HOT

Annual:

In order to keep the Aqua-Hot running at its full potential, it’s highly recommended to have the diesel-burner tuned up annually. This tune up consists of a new fuel nozzle (Part

Number: FLX-013-150) and fuel filter (Part Number: FLE-

120-100). To ensure maximum diesel-burner performance, always use the recommended fuel nozzle and fuel filter when replacing these parts. Reference the Aqua-Hot’s Service and Parts Manual for spare parts information and detailed replacement attachments.

Winterization:

When it’s time to store a motor home for the winter months or when freezing temperatures are expected, it’s crucial to properly winterize the Aqua-Hot to avoid serious damage, requiring a complete system replacement not covered under the Aqua-Hot Limited Warranty Statement. The process of winterization consists of completely draining the domestic water from the system and pumping RV winterization antifreeze through to flush out the system.

Not winterizing the Aqua-Hot when freezing temperatures are present will result in SERIOUS damage to the Aqua-

Hot’s Domestic Water Heating System. Also, be sure to use the FDA approved, “GRAS” rated antifreeze for winterization.

Please follow these instructions carefully when winterizing the Aqua-Hot’s hot water heating system:

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 pump.

4. Place the opposite end of the hose into an adequate supply of the RV antifreeze, “GRAS” by the FDA and allow this to pump through the system.

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 from the RV antifreeze and reconnect the domestic water demand pump’s suction line to the fresh water storage tank.

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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 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.

Fluids:

Overview:

When the antifreeze and water heating solution needs replenishing, remove the expansion tank’s cap and fill to the “HOT” level mark. When refilling, open the air release valve located on the expansion tank connection to release air pockets. Be sure the valve is closed when finished by hand tightening.

Types:

Due to the significant impact of various types of antifreeze on the Aqua-Hot system, it is necessary to provide a thorough explanation regarding what should and should not be used. It’s very important use the correct type of antifreeze for adequate operation and condition of the

Aqua-Hot System. The necessary type of antifreeze is propylene glycol based “boiler” type deemed “Generally Recognized as Safe” by the FDA. Propylene glycol is a safer alternative to the more toxic ethylene glycol antifreeze.

RV and Marine antifreeze types are propylene glycol based, but formulated specifically for “winterizing” application ONLY. Although RV and Marine antifreeze are often

“Generally Recognized as Safe” by the FDA, it should never be used in the Aqua-Hot System because it’s not formulated to transfer heat, which is absolutely essential for the functionality of the Aqua-Hot.

Automotive Antifreeze/Coolant types of antifreeze are propylene glycol based and formulated specifically to protect the automotive engines against, corrosion, freezing temperatures, and overheating. In addition, they have excellent heat transfer and thermal conductivity characteristics. Although these types of antifreeze are considered less toxic and safer than ethylene glycol, they are not

“Generally Recognized as Safe” by the FDA. Therefore, they must be marked with “harmful if swallowed” warning label. Due to the potentially hazardous properties, Automotive Antifreeze/Coolant should NEVER be used in an Aqua-

Hot System.

Mixture Recommendations:

To ensure maximum performance and longevity of the

Aqua-Hot system, it has been determined to use distilled, de-ionized, or soft water in commination with concentrated propylene glycol for the antifreeze and water heating solution. Concentrated propylene glycol should be diluted with high-quality (distilled, diluted, or soft) water, which is 80 ppm or less in total hardness. In order to find this information, the local water agency should have up-to-date water quality reports, which will indicate if the local tap water meets the requirements.

Hard water possesses 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 turn acidic, which can corrode the Aqua-Hot’s boiler tank and associated components prematurely. Keep in mind that using high-quality water is only necessary for mixing concentrated propylene

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glycol antifreeze with water. Suppliers of premixed antifreeze are responsible to use distilled, de-ionized, or soft water when preparing their antifreeze, so consumers shouldn't have to worry about it.

Mixture Ratios:

Technical Information:

Propylene glycol based (PPG) antifreeze has three major functions including freeze, boiling, and rust/anti-corrosive protection. PPG antifreeze solution is also primarily responsible for heat transfer; however, propylene glycol itself does not have 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 30-50% propylene glycol is recommended to provide the best performance combination. If the antifreeze and water heating solution contains over 70% propylene glycol, the freezing point is actually increased, resulting in less freeze protection. A perfect 50/50 mixture of water to propylene glycol, “GRAS” by the FDA antifreeze is recommended, which will result in a freeze point of –28°F and a boiling point of approximately 222°F. Please reference the graphical representation regarding the percentage of antifreeze to water and how it directly affects the solution’s freezing point.

Freeze 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 ambient temperature continues to decline, the water in the solution will attempt to attain a solid state. The point at which the water begins to solidify is called the “freeze point”. Although the water solution has begun to freeze, producing a “slushy” consistency, the antifreeze in the solution will continue to combat 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 and other components. 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. At this point, the liquid turns to 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 that 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 motor home where it can be utilized productively rather than dissipating due to its change from a liquid to a gas.

Rust and Anti-Corrosive Inhibitors:

Another major function of antifreeze solution is to provide protection to the internal metal components of the Aqua

-Hot hydronic heating system for corrosion and rust. Antifreeze is able to preform this function by the addition of rust and anti-corrosive inhibitors, which are designed specifically to activate in a water solution.

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Eyepiece

Using the Refractometer to Test Antifreeze Sample

Aqua-Hot Part Number MSX-907-162

Calibration Screw

Daylight Plate

Assembly

Use extreme caution in gathering your antifreeze sample.

When draining the Aqua-Hot heating system, extremely hot liquid may be in the boiler tank and could cause personal injury.

Main Prism

Assembly

NOTE: Refractometers may have more than one scale. Make sure you are reading the scale marked “Propylene” for measuring the antifreeze solution in the Aqua-Hot System.

Basic Operation

Step 1:

Open daylight plate, and place 2 to 3 drops of the sample on the main prism. Close the daylight plate so the liquid sample spreads across the entire surface of the prism without air bubble or dry spots. Allow the sample to rest on the prism for approximately

30 seconds before going to step 2.

(This allows the sample to adjust to the ambient temperature of the refractometer).

Step 2:

Hold daylight plate in the direction of a light source and look into the eye piece. You will see a circular field with graduations down the center (you may have to focus the eyepiece to clearly see the graduations). The upper portion of the field should be blue, while the lower portion should be white.

Step 3:

Take the reading where the boundary line of the blue and white cross the graduate scale. The scale will provide a reading of the freezing point of antifreeze solution and the propylene glycol concentration. Clean the prism carefully using a damp soft cloth. Do

NOT immerse in water.

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Section #: Title

Troubleshooting Guide

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 7 (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 Care & 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 diesel-burner switch “Indicator Light” does not illuminate and the diesel-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 diesel-burner controller unit. Reference page 7 (part #4).

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.

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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 diesel-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 dieselburner 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 diesel-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. p.

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Section #: Title

Troubleshooting Guide

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.

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.

Engine Preheat Pump Indicator Light:

The indicator light will illuminate GREEN whenever the engine preheat circulation pump is operating. Please note that this light will only be active if the engine preheat switch is ON in conjunction with either the diesel-burner and/or the electric element switch. If this indicator light illuminates

RED, it indicates an electrical overload condition (i.e., short) has occurred in this particular component’s circuitry.

NOTE: The Aqua-Hot’s VDC/VAC Control Thermostat will automatically activate the diesel-burner and/or the electric heating element ONLY if the diesel-burner and/or electric element switch is in the ON position.

Tempering Valve

The Tempering Valve for the Aqua-Hot system 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 7 (part #19).

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, please contact Aqua-Hot Heating Systems Technical

Support Department at 1-800-685-4298 for additional assistance or visit the web site at www.aquahot.com.

Figure 2

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DATE SERVICE PERFORMED SERVICE CENTER

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DATE SERVICE PERFORMED SERVICE CENTER

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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:

© Aqua-Hot®

450-D Use & Care Guide

19

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.

LTE-907-601 Rev. B

400

SERIES

450-D