Aqua-Hot 400 Series Service Manual page 88

Only propylene glycol based "boiler" type antifreeze deemed
"GRAS" (Generally Recognized as Safe) by the FDA shall be
used in the Aqua-Hot's hydronic heating system. Failure to
use the above specified antifreeze type could result in seri-
ous injury or death.
Ensure that the overflow tube is connected from the Aqua-
Hot's expansion tank connection to the expansion tank's
bottom connection and from the expansion tank's connec-
tion through the overflow tube hole in the motor home's bay
floor prior to beginning this antifreeze and water heating
solution fill procedure. Failure to do so could result in an
antifreeze spill in the motor home's bay.
In order to provide the best freeze protection, boil-over pro-
tection, and snit-corrosion and rust protection, a 50/50 mix-
ture of "GRAS" approved propylene glycol boiler antifreeze
and water is recommend.
Figure D-4
Drain Valve
Reference Section 1: Antifreeze and Water Heating Solution
for additional information regarding the antifreeze and wa-
ter heating solution. Be sure to use "GRAS" boiler-type pro-
pylene glycol based antifreeze rather than an RV and Marine
antifreeze or an automotive antifreeze/coolant.
If assistance is needed in selecting an appropriate anti-
freeze, please contact the Aqua-Hot Heating System Product
Application Department at 1-800-685-4298.
To Drain the Aqua-Hot:
Connect a piece of 1/2 inch PEX-type tubing or rubber hose
to the drain valve. This piece should be long enough to
transport the antifreeze and water heating solution from the
Aqua-Hot to a bucket.
Open the Aqua-Hot's drain valve located at the from the of
heater. Reference Figure G5.
NOTE: The Aqua-Hot 400 holds approximately 7 gallons of
antifreeze and water heating solution.
© Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014
Section #: Title
Appendix D: Filling and Draining
Aqua-Hot
p.
88