Aqua-Hot 450D Use And Care Manual
  1. Manuals
  2. Brands
  3. Aqua-Hot Manuals
  4. Heating System
  5. 450 D
  6. Use and care manual

Aqua-Hot 450D Use And Care Manual

Hide thumbs Also See for 450D:

Advertisement

Table of Contents

AHE-450-DE5 Use and Care Guide
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 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 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 specifications of your unit. Factory settings may be adjusted by the
vehicle manufacturer, confirm final setting with your dealer.
• This heating system has been certified for installation only in recreational vehicles, not certified for use in boats.
https://tiffin-motor-homes-prod.mindtouch.us/Technical_Support/Class_A/2024/Allegro_Bus/35_CP/Component_Manuals/Aqu...
Updated: Fri, 21 Jun 2024 04:20:07 GMT
Powered by
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 450D and is the answer not in the manual?

Questions and answers

Related Manuals for Aqua-Hot 450D

Summary of Contents for Aqua-Hot 450D

  • Page 1 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.
  • Page 2 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.
  • Page 3 2. Diesel Burner: This is the Aqua-Hot’s most powerful heat source and provides all of the heating and hot water needs in cold temperatures or dry camping. 3. The Vehicle’s Engine: When driving or idling, the engine’s surplus heat is transferred to the Aqua-Hot, providing interior heat and limited hot water without burning any other fuel.
  • Page 4 https://tiffin-motor-homes-prod.mindtouch.us/Technical_Support/Class_A/2024/Allegro_Bus/35_CP/Component_Manuals/Aqu… Updated: Fri, 21 Jun 2024 04:20:07 GMT Powered by...
  • Page 5 8. Interlock Switch 14. Wiring Harness Port Pump Pump 3. Zone 2 Circulation 9. VAC Access Panel 15. Aqua-Hot Reporter 21. Engine Preheat Inlet Pump 4. Diesel Burner 16. Domestic Water 10. AC Terminal Block 22. Domestic Cold Water Inlet...
  • Page 6 https://tiffin-motor-homes-prod.mindtouch.us/Technical_Support/Class_A/2024/Allegro_Bus/35_CP/Component_Manuals/Aqu… Updated: Fri, 21 Jun 2024 04:20:07 GMT Powered by...

  • Page 7: Control Overview

    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.

  • Page 8: Domestic Hot Water System

    • 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 or by tapping the burner to ON on the coach display screen.
  • Page 9 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 as shown in Figure The pink paint witness mark verifies that the Aqua-Hot is set at the correct factory setting and did not get tampered with during shipping or installation.

  • Page 10: Operational Flow Chart

    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.
  • Page 11 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”...
  • Page 12 Winterizing the Aqua-Hot 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 Aqua- Hot domestic water heating system. Reference Figure 10 for a system overview.

  • Page 13: Antifreeze Types

    (bleach or liquid bleach). Using products containing bleach, including water refreshers, may cause corrosion of the domestic water lines, 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.
  • Page 14 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 type of antifreeze is not formulated to transfer heat, which is essential to the heating system’s functionality and does not contain rust inhibitors.
  • Page 15 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 from corrosion and rust. Antifreeze is able to perform this function by the addition of rust and anticorrosive inhibitors, which are designed specifically to activate in a water solution.
  • Page 16 Using a Refractometer Properly Apply Antifreeze to the Prism Assembly Use the guide below to properly apply the propylene glycol mixture to the prism assembly of the refractometer. Once that is complete, peer through the eyeglass of the refractometer to continue to the next step. Adjust the Boundary Line Once the glycol solution has been properly applied, adjust the calibration screw until the boundary line labeled “Propylene Glycol”...

  • Page 17: General Troubleshooting

    1. Verify that the Aqua-Hot’s access cover is securely installed. 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 ¼ tank.

  • Page 18: Testing Functionality

    574-AIR-XCEL (574-247-9235) or visit our web site at www.aquahot.com. The Aqua-Hot Reporter contains both a fault page, and a fault log. The fault page contains information on faults that have occurred since the last time the Reporter was reset or power cycled. The fault log cannot be cleared and it can contain up to four historic fault conditions, not necessarily related to a present issue.
  • Page 19 Low-Level Cut Off Aqua-Hot units require a minimum amount of antifreeze in order to function correctly. Keep in mind that the exact fluid volume may differ depending on the layout of your coach. If the heater drops below the minimum fill level as indicated on the expansion bottle, the Reporter will shut down all fans, pumps, and heat sources until the unit has been refilled and the Reporter has been reset.
  • Page 20 Please note that if used improperly, this testing tool could cause damage to your Aqua-Hot unit and the heating subsystem test is NOT a replacement for standard unit operation. If you have any questions, please don’t hesitate to contact the Aqua-Hot technical support department at 574-AIR-XCEL (574-247-9235).
  • Page 21 RVC network indicating to the Reporter that it is to continue normal operation. Loss of 6 consecutive signals from the RVC 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.

  • Page 22: Manual Mode

    Manual Mode The 2.0 Reporters with CFG 1.9 and greater come with a manual mode in case the general coach RVC 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 affixed to the back of the circuit board, OR shown on the home screen - “FW: 2.0”.
  • Page 23 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 specified percentage of 10 minutes.

This manual is also suitable for:

Ahe-450-de5

Table of Contents