Aqua-Hot 375-LP, Installation Manual

Page: 41 / 56

© 2011 Aqua - Hot
®
375 - LP Installation Manual
S
ECTION
10: P
URGING THE
S
YSTEMS
Figure 49
Figure 50
— Page 41 —
Drain Valve
Purging the Hydronic Heating System:
In order to provide the best freeze protection, boil-
over protection, and anti-corrosion and rust protec-
tion, a mixture of “GRAS” approved propylene gly-
col antifreeze and water is recommended.
Aqua-Hot recommends the antifreeze solution in
the Aqua-Hot system contain 35% to 50% propyl-
ene glycol.
You must refer to the information and chart in
Appendix E and determine the level of protec-
tion required for your operating conditions.
Reference Appendices C through E for additional
information regarding the antifreeze and water heat-
ing solution. Be sure to use a “GRAS” boiler -type
propylene glycol based antifreeze rather than an RV
and Marine antifreeze or an automotive antifreeze/
coolant.
If assistance is needed in selecting an appropriate
antifreeze, please contact the Aqua-Hot Heating Sys-
tems Product Application Department at 1-800-685-
4298.
CAUTION
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 top con-
nection through the overflow tube hole in the mo-
torhome’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 motorhome’s bay.
Reference Figure 12.
WARNING!
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 serious injury or death.
Air Release Valve
Expansion Tank
Connection