AquaHot 450 Series Owners Manual
450 --- DE/DM
Owner’s Manual
© 2008 Aqua-Hot Heating Systems Inc.
TABLE OF CONTENTS
Limited Warranty Statement
Introduction
. Introduction to the Aqua-Hot Hydronic Heating System�������������������������������������������������������������������� Page 1
Operating Instructions
. Activating the Aqua-Hot Heating System�������������������������������������������������������������������������������������������� Page 4
. Zone Thermostat Operation���������������������������������������������������������������������������������������������������������������� Page 4
. Using the Domestic Hot Water System����������������������������������������������������������������������������������������������� Page 5
. Aqua-Hot Operational Flow-Chart����������������������������������������������������������������������������������������������������� Page 6
Maintenance
. Monthly Maintenance������������������������������������������������������������������������������������������������������������������������� Page 7
. Replenishing the Antifreeze and Water Heating Solution�������������������������������������������������������������������� Page 7
. Annual Maintenance��������������������������������������������������������������������������������������������������������������������������� Page 7
Winterization
. Winterizing the Domestic Water Heating System�������������������������������������������������������������������������������� Page 8
. De-Winterizing the Domestic Water Heating System�������������������������������������������������������������������������� Page 8
Troubleshooting
. General Information��������������������������������������������������������������������������������������������������������������������������� Page 9
. Electronic Controller Diagnostic��������������������������������������������������������������������������������������������������������� Page 9
Appendices
. Appendix A: Antifreeze Types����������������������������������������������������������������������������������������������������������������� A-1
. Appendix B: Antifreeze Mixture Water Quality Recommendations�������������������������������������������������������� B-1
. Appendix C: Antifreeze Terms and Mixture Ratio���������������������������������������������������������������������������������� C-1
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
WARRANTY
2-YEAR LIMITED WARRANTY
AQUA-HOT® HYDRONIC HEATING SYSTEM
AHE-450-DE/DM
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 specifically 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.aqua-hot.com.
INTRODUCTION
This manual should be maintained in legible condition and
kept in a safe, easily accessible place for future reference.
Please read the complete Owner’s Manual prior to operating
the Aqua-Hot Hydronic Heating System.
The Aqua-Hot Heating System is a Hydronic Heating System
that provides interior zone heating where and when it is needed,
as well as a continuous, on-demand supply of domestic hot
water. Both heating features are accomplished by a 12 VoltDC powered diesel-burner and a 120 Volt-AC powered electric
heating element, which maintains the temperature of the AquaHot’s antifreeze and water heating solution.
Both the Aqua-Hot 450-DE and 450-DM heaters include a
motoraide feature, which uses the circulation of the motorhome’s
engine to transport the antifreeze and water heating solution
from the Aqua-Hot’s boiler tank to the motorhome’s warm
engine and back to the boiler tank. Through this process, the
boiler tank is kept heated, which reduces the time required to
bring the tank to operating temperature.
The Aqua-Hot 450-DE also includes an engine preheat feature.
This preheat feature provides an easy engine start-up whenever
cool weather conditions are present. Be sure to reference Figures
1 through 4 for a complete component overview.
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, reference the
Appendices, contact the Aqua-Hot Heating Systems
Technical Support Department at 1-800-685-4298, or
visit the Web site www.aqua-hot.com.
Danger, Warning, Caution, and Note Boxes:
Danger, Warning, Caution, and Note boxes appear throughout this
manual as a means of alerting the operator to important information.
Indicates that personal injury is likely or imminent.
Indicates that serious damage to the heater will occur and
personal injury is possible as well.
Indicates that damage to the heater is possible.
NOTE: Indicates information that requires special attention by
the operator.
— Page 1 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
3069328
INTRODUCTION
Figure 1
AC Wiring
Port
Wire Harness Port
Product I.D.
Label
Engine Preheat
Circulation Pump
Domestic Cold Water Inlet
Diesel-Burner
Diesel-Burner Controller
Zone 1
Circulation
Pump
Zone 2
Circulation
Pump
Engine Preheat
Outlet (to engine)
Domestic Hot
Water Outlet
Drain Valve
Interlock Switch
Engine Preheat Inlet
(from engine)
Back of Unit
Figure 2
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© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
INTRODUCTION
Top of 450-D
Heating Zone
Return Ports
Product I.D.
Label
Air Release
Valve
AC Wiring Port
Expansion Tank
Connection
Wiring Harness
Port
Heating
Zone
Outlet Ports
Diesel Fuel
Inlet /Outlet
Ports
Figure 3
Heating Zone 1
Outlet Port
Heating Zone 2
Outlet Port
Wire Harness
& Harness Port
AC Junction Box
Diesel-Burner
Zone 1
Circulation
Pump
Drain Valve
Zone 2
Circulation
Pump
Interlock
Switch
Figure 4
— Page 3 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
OPERATING INSTRUCTIONS
The Aqua-Hot’s Exhaust is HOT!
DO NOT park in areas where dry conditions exist underneath the vehicle, (e.g., in a dry, grassy field) as a fire may
result!
DO NOT operate the Aqua-Hot’s diesel-burner inside an
enclosed building!
The heater must be switched OFF when refueling.
DO NOT operate the diesel-burner and/or electric heating
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.
Activating the Aqua-Hot Heating System:
Diesel-Burner:
Turn the diesel-burner switch ON. Reference Figure 5. This
procedure will activate the diesel-burner and the indicator light
located on 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 both the interior and the domestic hot water (such as when
cool ambient temperatures exist and/or when there is a high
demand for domestic hot water).
Electric Heating Element:
Turn the electric element switch ON. Reference Figure 5. This
procedure will activate the 120 Volt-AC electric heating element
and the indicator light located on the electric element switch.
Allow 1-2 hours for the Aqua-Hot System to reach operating
temperature.
NOTE: The motorhome must be connected to shore power, or
the generator must be running, in order to activate the
electric heating element.
The electric heating element is a secondary heat source for
heating both the interior and the domestic hot water during
low heating demand situations (such as when moderate ambient temperatures exist and/or when there is a low demand for
domestic hot water).
Zone Thermostat Operation
Interior Room Thermostat:
Simply adjust each interior room thermostat to the desired
temperature. Then, whenever an interior room thermostat “calls
for heat,” the Aqua-Hot’s circulation pump and interior heat
exchanger fans will be activated. These devices, together, will
supply warmth and comfort to each interior heating zone. The
Aqua-Hot must be at operating temperature in order for the
zones to function. Please contact the specific motorhome manufacturer for the exact location of the interior room thermostats.
Fresh Water Tank Thermostat:
Figure 5
NOTE: Both the diesel-burner and the electric heating element
are thermostatically controlled. Either, or both, heating
sources will automatically maintain the temperature
of the Aqua-Hot’s antifreeze and water heating solution between approximately 160°F and 190°F (±5).
Therefore, to heat the motorhome/domestic hot water,
simply choose the desired heat source(s) and leave the
switch(es) (i.e., diesel-burner and/or electric element)
ON.
Simply adjust the thermostat for bay heating to a minimum of
40°F. This will prevent freezing of the domestic water storage
system. Please contact the specific motorhome manufacturer for
the exact location of the fresh water tank thermostat.
— Page 4 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
OPERATING INSTRUCTIONS
Using the Domestic Hot Water System
When the Aqua-Hot is at operating temperature, the domestic
water is automatically heated as it is being used. Becayse the
Aqua-Hot does not store any hot water, simply open any hot
water faucet, and a continuous supply of domestic hot water
will be present within a few seconds. This hot water feature is
continuous and is accomplished by the Aqua-Hot’s hot water
heating system. The diesel-burner switch on the interior switch
panel must be ON in order to obtain a continuous supply of hot
water (e.g., during showers); be sure to also activate the electric
element switch for maximum hot water capacity. Reference
Figure 6.
NOTE: The Aqua-Hot’s “Domestic Water Priority System”
disables the interior zone heating fans and the zone
circulation pumps whenever domestic hot water is
being used on a continuous basis (e.g., during showers). Once the demand for continuous domestic hot
water ceases, the Aqua-Hot will enable the fans and
the pumps to operate and provide heat to the heating
zones.
Figure 6
Diesel-Burner switch must be
ON to obtain a continuous
supply of hot water.
Activate the electric element switch for maximum
hot water capacity.
— Page 5 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
OPERATING INSTRUCTIONS
Aqua-Hot Operational Flow-Chart
Heating Zone Thermostat
calls for heat.
“Engine Preheat” switch on the Interior
Switch Panel is activated. (450-DE ONLY)
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, in turn, 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.
Continuous hot water is supplied to the
faucet.
The cooled antifreeze and water heating
solution is returned to the Boiler Tank to be
reheated.
The antifreeze and water heating solution
within the Boiler Tank is reheated, as
needed, and continues warming the
engine’s coolant as it circulates through the
Aqua-Hot’s internal Engine Preheat
System.
— Page 6 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
Maintenance Schedule
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 diesel-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 heating
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
the Appendices, contact the Aqua-Hot Heating Systems
Technical Support Department at 1-800-685-4298, or
visit the Web site at www.aqua-hot.com.
MAINTENANCE
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 7. Please note that the coolant level
should be checked only when the Aqua-Hot is at maximum
operating temperature (i.e., immediately after the diesel-burner
cycles OFF). When the Aqua-Hot is at maximum operating
temperature, the antifreeze and water heating solution should be
at the level marked “HOT” on the expansion tank.
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 connection to release air pockets.
Reference Figure 8. Hold the valve open until all air is released.
If necessary, refill the expansion tank again. Be sure the valve is
closed when finished by hand-tightening. Reference Appendices
A through C to determine the correct ratio of 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.
Annual Maintenance:
Figure 7
To keep the Aqua-Hot running smoothly, it is ideal to have the
diesel-burner tuned-up annually. A tune-up should consist of
a new fuel nozzle and fuel filter. Reference Figure 9. 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 instructions. Contact the
Aqua-Hot Heating Systems Technical Support Department at
1-800-685-4298 for assistance or to locate the nearest Aqua-Hot
Service Center or visit the web site at www.aqua-hot.com.
Figure 9
Air Release
Valve
Expansion Tank
Connection
Fuel Nozzle
Figure 8
Fuel Filter
— Page 7 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
WINTERIZATION
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 the 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 temperatures
are present will result in serious damage to the Aqua-Hot’s
domestic water heating system. Also, be sure to use an FDA
approved, “GRAS” rated antifreeze for winterization.
NOTE: The Aqua-Hot can continue to be used for interior
zone heating once the domestic water heating system
has been drained and winterized.
De-Winterizing the Domestic Water Heating System:
For de-winterization, completely fill the fresh water storage tank.
Open and close all interior and exterior water faucets, one at a
time, until only clear water is present/visible. Reference Figure 10.
The Aqua-Hot’s domestic water heating system must be completely drained of domestic water any time the heater is stored
where freezing temperatures may be experienced.
If disinfecting the potable water system after de-winterizing, be
sure to follow RVIA’s “Instructions for Disinfection of Potable
Water Systems on Recreation Vehicles.” These instructions can
be obtained by contacting the Recreational Vehicle Industry Association at (703) 620-6003, visiting them online at www.rvia.
com, or writing to them at the following address:
Winterizing the Domestic Water Heating System:
Please follow these instructions when winterizing the Aqua-Hot’s
domestic water heating system. Reference Figure 10:
Recreation Vehicle Industry Association
1896 Preston White Drive
P.O. Box 2999
Reston, VA 20195-0999
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.
Fresh
Water Storage
Tank
RV
Antifreeze
Arrows indicate directional flow of
domestic water.
Demand
Pump
To Cold Water
Faucets
Domestic
Cold Water
INLET
Domestic
Hot Water
OUTLET
To Hot Water Faucets
Figure 10
Remove the hose from the fresh water storage tank and attach an adequate piece of hose onto the
suction side of the demand pump. Place this hose into a container of RV Antifreeze and allow this
to pump through the domestic water system until the faucets run pure antifreeze.
— Page 8 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
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.
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 diesel
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 manual for refilling instructions.
4) Check the Aqua-Hot’s electronic controller for any RED
lights indicating a fault condition.
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 11.
2) Check for loose wire connections on the electronic 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 connectors on the diesel-burner controller unit. Reference Figure 2.
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 for additional troubleshooting assistance of visit the Web site at www.aqua-hot.com.
If the Aqua-Hot Heating System’s failure to operate is not resolved with the above checks, please contact Aqua-Hot Heating
Systems Technical Support Department. at 1-800-685-4298 for
additional assistance or visit the Web site at www.aqua-hot.com.
Electronic Controller Diagnostic
Figure 11
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 a 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 diesel-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 the Low Voltage
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 electronic controller can be reset by turning
OFF the diesel-burner switch on the interior switch panel for
approximately 30 seconds, then turning the switch back ON
— Page 9 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
TROUBLESHOOTING
or by pressing the “Low Voltage Reset” button located on the
electronic controller (use a thin, straight, nonmetallic object to
access the reset button through the small hole in the faceplate).
five indicator lights illuminate RED, it indicates that an electrical
overload condition (i.e., short) has occurred in a particular
heating zone’s circuitry.
Overload Fault Indicator Light:
NOTE: The low temp cutoff light must be illuminated and
heater must be up to operating temperature.
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 electrical
overload (i.e., short) and/or high-heat condition is corrected.
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
A short in either a heating zone’s interior room
thermostat or a heating zone’s heat exchanger circuit
will cause the indicator light to illuminate RED.
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.
Engine Preheat Pump Indicator Light:
Electric Heating Element Status Indicator Light:
This 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.
This indicator light will illuminate GREEN whenever the AquaHot’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 in the ON position. 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 powered circuitry.
NOTE: The Aqua-Hot must be up to operating temperature and the Low Temp Cutoff Light must be illuminated.
Heating Status Indicator Light:
This indicator light will illuminate GREEN whenever the AquaHot’s VDC/VAC control thermostat is calling for heat, allowing
the antifreeze and water heating solution in the Aqua-Hot’s
boiler tank to be heated by either the diesel-burner and/or the
electric heating element. When this indicator light is off, no
heat is being supplied to the Aqua-Hot’s boiler tank by either of
these two heat sources.
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.
— Page 10 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
Appendix A
Antifreeze Types
Appendix A: Antifreeze Types
The following information addresses the necessary usage of a 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
of Plumbing and Mechanical Officials), only those
propylene glycol based “boiler” type antifreezes deemed
“Generally Recognized as Safe” (GRAS) by the FDA
should be utilized.
Because of the significant impact various types of antifreeze can have 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:
RV & Marine Antifreeze:
These types of propylene glycol based antifreeze
products are formulated specifically for “winterizing”
applications 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 type of antifreeze is not formulated to transfer heat, which is essential to the
Aqua-Hot’s functionality and does not contain rust
inhibitors. Please note, however, that RV & Marine
antifreeze can be utilized to winterize the Aqua-Hot’s
Domestic 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 characteristics. 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 hazardous
properties, they should never be used in the Aqua-Hot’s
Hydronic Heating System.
— Page A-1 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
Appendix B
Antifreeze Mixture Water
Quality Recommendations
Appendix B: Antifreeze Mixture Water Quality Recommendations
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 antifreeze and water heating solution.
Please note 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 possesses a high-level of calcium and magnesium ions, which deplete the propylene glycol antifreeze’s corrosion inhibitors. This, in turn, 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.
— Page B-1 —
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
Appendix C
Antifreeze Terms
and Mixture Ratio
APPENDIX C: Antifreeze Terms and Mixture Ratio
The following information addresses the process of
selecting an antifreeze and water mixture ratio that provides adequate freeze, boiling, and rust/anti-corrosive
protection. A 50/50 mixture ratio is recommended,
which will result in a freeze point of approximately
-28ºF and a boil point of approximately 222ºF.
The following information should be utilized for the
purpose of clarifying some terms commonly associated
with antifreeze.
the burst point, the potential is present for ruptured
pipes to exist. The burst point of the antifreeze and
water heating solution is dependent upon the brand of
propylene glycol employed.
Boiling Point:
Freeze Point and Burst Point:
Antifreeze lowers the freezing point of any liquid, to
which it has been added, by preventing the formation
of ice 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 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 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
Rust and Anti-Corrosive Inhibitors:
excellent heat conductor, it is added to the mixture.
A 50/50 solution of propylene glycol antifreeze and
water 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, which could ultimately inhibit the
Aqua-Hot from providing adequate domestic hot water
and interior heating.
Another major function of antifreeze is to provide protection to the internal metal components of the AquaHot 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.
Summary:
Antifreeze has three basic functions: freeze protection, boil-over protection, and anti-corrosion and rust
protection.
Antifreeze is also primarily responsible for heat transfer;
however, antifreeze itself does not possess acceptable
heat transfer characteristics. Therefore, as water is an
The Aqua-Hot utilizes the antifreeze and water heating
solution as a transportation means for the heat produced from the internal processes. The antifreeze absorbs the heat created until its boiling point is reached;
it is at this point that 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.
Additionally, if the antifreeze and water heating solution contains over 70 percent antifreeze, 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.
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
— Page C-1 —
Percentage of Propylene Glycol
in Solution
APPENDIX C: ANTIFREEZE TERMS AND MIXTURE RATIO
60%
50%
40%
30%
20%
10%
-7
-28
-60
-40
-20
8
0
10
19
20
26
30
Freezing Point Temperature
(In Degrees Fahrenheit)
© 2008 Aqua-Hot® 450-DE/DM Hydronic Heating System Owner’s Manual
— Page C-2 —
OWNER’S SERVICE LOG:
Date
(Continued)
Date
Service Performed
Service Center
OWNER’S SERVICE LOG:
Service Performed
Service Center
15549 East Highway 52 • Fort Lupton, Colorado 80621
1.800.685.4298 • Fax: 303.857.9000 • www.aqua-hot.com
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