OWNER`S MANUAL - Aqua-Hot

OWNER`S MANUAL - Aqua-Hot
© 2008 Aqua-Hot Heating Systems Inc.
Owner’s Manual
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Zone Thermostat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Using the Domestic Water Heating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
Aqua-Hot Operational Flow-Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 4
Page 5
Page 5
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
.
Diesel-Burner Blinking Fault Indicator Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Appendices
.
Appendix A: Antifreeze Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page A-1
.
Appendix B: Antifreeze Mixture Water Quality Recommendations. . . . . . . . . . . . . . . Page B-1
.
Appendix C: Antifreeze Terms and Mixture Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page C-1
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
2-YEAR LIMITED WARRANTY
AQUA-HOT® HYDRONIC HEATING SYSTEM
AHE-375-D
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
location for future reference.
Please read the complete Owner’s Manual prior
to operating the Aqua-Hot Hydronic Heating
System. Also, be sure to fill out and mail in the
“Warranty Registration” card located at the
front of this manual.
The Aqua-Hot Heating System is a Hydronic Heating System
(heating with hot water) that provides interior zone heating
where and when it is needed, as well as a continuous, ondemand supply of domestic hot water. Both heating features
are accomplished by a 12 Volt-DC powered Diesel-Burner
and a 120 Volt-AC powered Electric Heating Element, which
maintain the temperature of the Aqua-Hot’s antifreeze and
water heating solution. Be sure to reference Figures 1-A
through 1-C for a complete component overview.
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.
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 Appendix A, contact the Aqua-Hot Heating
Systems Technical Support Department at
1-800-685-4298, or visit the web site at
www.aqua-hot.com.
Zone 1 Pump and
Zone 2 Pump
Inlet Ports
Zone 1
Pump and
Zone 2
Pump Outlet
Ports
I.D. Label
Diesel Fuel
Inlet /Outlet
Ports
Hot Water
Outlet Port
Terminal
Block
Access
Cold Water
Inlet Port
Air-Release
Valve
Expansion Tank
Connection
Figure 1-A
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 1
INTRODUCTION
120 Volt-AC
Relay
Zone 1 Relay
Zone 2 Relay
Fuse Block
Ground Strip
Zone 2
Circulation
Pump
Figure 1-B
Interlock
Switch
Figure 1-C
Zone 1 Relay
Zone 2 Relay
Fuse Block
Diesel Burner
Controller
Drain Valve
Zone 2
Circulation
Pump
Diesel Burner
Mounting Tray
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 2
INTRODUCTION
Aqua-Hot I.D. Label
For installation only in a compartment that is completely closed off from living quarters and
accessible only from the outdoors.
The Exhaust System MUST NOT terminate beneath the vehicle or under an openable window or vent.
Combustion Air MUST BE supplied from outside the vehicle.
CAUTION: THIS APPLIANCE OPERATES ON BOTH AC AND DC POWER.
USE COPPER CONDUCTORS ONLY!
Use a 25-Amp fuse for over-current protection for the DC power supply.
Use a circuit breaker that cuts power at 20-Amps maximum for over-current protection for the
120-VAC power supply.
Mount the Heater near a bay/storage door so that the Access Cover can be easily removed for service.
WARNING: DO NOT OPERATE APPLIANCE WITH ACCESS COVERS REMOVED.
Minimum Heater Clearances:
Front - Open Access
Back - 0 inches
Top - 0 inches
Sides - 0 inches
Install in strict compliance with local codes, NFPA 1192, and the manufacturer’s instructions.
3069328
Direct Vent Appliance
245
Figure 2
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 3
OPERATING INSTRUCTIONS
Electric Heating Element:
The Aqua-Hot’s Exhaust is HOT!
DO NOT park in areas where dry conditions exist underneath the vehicle as a fire may result (i.e., in a dry, grassy
field)!
DO NOT operate the Aqua-Hot’s Diesel-Burner inside an
enclosed building!
Turn the Electric Element switch ON; reference Figure 3.
This procedure will activate the 120 Volt-AC Electric Heating
Element and the indicator light located adjacent to the Electric
Element switch. Allow 1-2 hours for the Aqua-Hot System to
reach operating temperature.
The Heater must be switched OFF when refueling.
NOTE: The motorhome must be connected to shore power,
or the generator must be running, in order to activate
the Electric Heating Element.
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.
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).
Activating the Aqua-Hot Heating System:
Diesel-Burner:
Turn the Diesel-Burner switch ON; reference Figure 3. This
procedure will activate the Diesel-Burner and the indicator
light located adjacent to the Diesel-Burner switch. Allow 1020 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).
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.
Figure 3
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 4
OPERATING INSTRUCTIONS
Zone Thermostat Operation
Using the Domestic Water Heating System
Interior Room Thermostat:
When the Aqua-Hot is at operating temperature, the domestic
water is automatically heated as it is being used. Because 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 Domestic 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 4.
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:
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.
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.
Figure 4
Diesel-Burner switch
must be ON to obtain a
continuous supply of hot
water.
Activate the Electric
Element switch for
maximum hot water
capacity.
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 5
OPERATING INSTRUCTIONS
Aqua-Hot Operational Flow-Chart
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 6
MAINTENANCE
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.
When the Aqua-Hot is at maximum operating temperaHOT! If the Aqua-Hot’s
Heating System is accessed, scalding by hot vapor or
coolant could result!
ture, the coolant will be very
Before cleaning or servicing, disconnect all power
supplies!
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 6. 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 in order 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.
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 Appendix A, contact Aqua-Hot Heating
Systems Technical Support Department at 1-800-6854298, or visit the website at www.aqua-hot.com.
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 5. Please note that the
Annual Maintenance:
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 7. 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 website
at www.aqua-hot.com.
Air Release
Valve
Expansion Tank
Connection
Figure 6
Figure 7
Figure 5
Part Number: FLX-013-150
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Part Number: FLE-120-100
Page 7
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.
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.
6. Remove the hose and reconnect the domestic water demand pump’s suction line to the fresh water storage tank.
De-Winterizing the Domestic Water Heating System:
NOTE: The Aqua-Hot can continue to be used for interior
zone heating once the domestic water heating system
has been drained and winterized.
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 8.
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 AquaHot’s Domestic Water Heating System; reference Figure 8:
1. Completely drain the fresh water storage tank.
Recreation Vehicle Industry Association
1896 Preston White Drive
P.O. Box 2999
Reston, VA 20195-0999
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.
Aqua-Hot 375-D Heater
Arrows indicate directional flow of
domestic water
To Hot Water Faucets
Domestic
Hot Water
OUTLET
Domestic
Cold Water
INLET
Fresh
Water Storage
Tank
Figure 8
To Cold Water
Faucets
Demand
Pump
RV
Antifreeze
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.
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 8
TROUBLESHOOTING
General Information
Diesel-Burner Blinking Fault Indicator Light
Should the Aqua-Hot Hydronic Heating System fail to operate, complete the following checks:
1) Check the interior switch panel for a blinking indicator
light on the diesel-burner switch. If the indicator light
is blinking, count the number of consecutive flashes and
contact the Aqua-Hot Heating Systems Technical Support
Department at 1-800-685-4298.
2) 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.
3) Ensure that the vehicle’s fuel tank contains a sufficient
level of fuel.
4) 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.
The Interior Switch Panel incorporates a self-diagnosing
blinking fault indicator light, which by using a series of blinking lights, indicates the particular component of the dieselburner that failed during operation.
Each series of blinks is active for 0.5 seconds “ON” and 0.5
seconds “OFF” with a three-second interval between each
fault series. This sequence will repeat continuously until the
diesel-burner switch is moved to the “OFF” position, the 12
Volt-DC power is disconnected from the diesel-burner’s controller, or the Aqua-Hot’s access cover is removed.
Should a diesel-burner malfunction occur, the Aqua-Hot Hydronic Heating System will cease operation and will activate
the appropriate diesel-burner blinking fault sequence. Count
the number of flashes and contact the Aqua-Hot Heating Systems Technical Support Department at 1-800-685-4298.
5) Verify that the wires attached to the ground strip are
firmly attached; reference Figure 1-B.
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.aqua-hot.com.
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
Page 9
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.
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. Please note, however, that RV & Marine antifreeze
can be utilized to winterize the Aqua-Hot’s Domestic Water
Heating System.
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:
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.
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
Automotive Antifreeze/Coolant:
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
A-1
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.
© 2008 Aqua-Hot® 375-D Hydronic Heating System Owner’s Manual Rev. A
B-1
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.
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.
The following information should be utilized for the purpose
of clarifying some terms commonly associated with antifreeze.
Another major function of antifreeze 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 anti-corrosive inhibitors, which are designed specifically to activate in a
water solution.
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 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:
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
Rust and Anti-Corrosive Inhibitors:
Summary:
Antifreeze has three basic functions: freeze protection, boilover 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 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.
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® 375-D Hydronic Heating System Owner’s Manual Rev. A
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® 375-D Hydronic Heating System Owner’s Manual Rev. A
C-2
OWNER’S SERVICE LOG:
Date
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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