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Aqua-Hot™ Hydronic Heating System Installation Manual 07/05
Page 51
System
Bleeding
3.26 Bleeding the Interior/Fresh Water Tank Hydronic Heating System
It is necessary to utilize a propylene glycol based “boiler” type antifreeze in the Aqua-
Hot Hydronic Heating Systems. 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 can be
utilized.
NOTE: Because of the significant impact various types of antifreeze can have on a
Hydronic Heating System - including the level of safety provided, Vehicle Systems, Inc.
has recognized 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 Heating System’s functionality and does not
contain rust inhibitors.
Automotive Antifreeze/Coolant: These type 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 “GRAS” (Generally Recognized as Safe) 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.
Prior to bleeding the Aqua-Hot Hydronic Heating System with the proper solution of
antifreeze and water, it is recommended that the plumbing system be tested for potential
leaks. The following instructions detail how to properly perform a plumbing system
pressure test:
A. Remove the Aqua-Hot’s Radiator Cap and replace it with a ”Cooling System
Pressure Tester”; reference Figure 33. Please note that these types of Pressure
Testing products can typically be obtained from a local Automotive Parts
Supplier.
B. Apply 15 pounds (PSI) of air pressure to the Aqua-Hot’s Hydronic Heating
System.
NOTE: DO NOT exceed 15 PSI of air pressure, as this could cause damage to the
internal plumbing components of the Aqua-Hot.
C. Allow the air pressure to remain in the plumbing system for a minimum of 30
minutes.
D. After the minimum 30 minute interval has expired, check the “Cooling System
Pressure Tester’s” gauge for any loss of pressure.
SECTION 3: INSTALLATION PROCEDURES