Kenmore K90-150 Owner's Manual page 19

1. Consult localwater treatmentspecialistfor wa-
ter treatmentrecomendations if your waterpH lev-
els are belowof 7.0 or hardnessis above 7 grains
hardness.
a. This boileris designedfor use in a closed
hydronicheatingsystemONLY!
b. Excessivefeedingof fresh make-up
water
to the boiler may lead to premature failure of
the boiler sections.
2. Use clean fresh tap water for initial fill and peri-
odic make-up of boiler.
a. A sand filter must be used if fill and make-
up water from a well is to be used.
b. Consideration should be given to cleaning
the heating system, particularly in retrofit sit-
uations, where a new boiler is being installed
in an older piping system.
c. In older systems, obviously discolored,
murky, or dirty water, or a pH reading below
7, are indications that the system should be
cleaned.
d. A pH reading between 7 and 8 is preferred.
3. Antifreeze, if needed, must be of a type specifically
designed for use in closed hydronic heating systems
and be compatible with type 356 T6 aluminum at op-
erating temperatures between 20°F and 250°F.
a. Use of antifreeze must be in accordance
with local plumbing codes.
b. Pure glycol solutions are very corrosive,
therefore hydronic system antifreeze typi-
cally contains corrosion inhibitors. Different
brands of hydronic system antifreeze contain
different types of corrosion inhibitors. Some
brands have corrosion inhibitors that break
down more rapidly or become ineffective at
higher temperatures when used with alumi-
num. This could lead to premature failure of
the aluminum boiler. Consult the antifreeze
manufacturer on the compatibility of their
product with aluminum.
c. Follow the antifreeze manufacturer's in-
structions on determining proper ratio of an-
tifreeze to water for the expected low tem-
perature conditions, and for maintaining the
quality of the antifreeze solution from year to
year. Improperly maintained antifreeze solu-
tions will gradually lose their ability to protect
the aluminum boiler from corrosion.
d. The recommended premixed antifreeze
solution is INTERCOOL NFP-50. This
product is sold direct to distributors by the
antifreeze manufacturer. Please contact In-
terstate Chemical Company, New York Cus-
tomer Service at 1-800-422-2436 or your dis-
tributor for more information.
Use of an alternate manufacturer's premix
antifreeze is acceptable if the product speci-
fications are comparable with those of the
recommended premix antifreeze and the an-
tifreeze is compatible with type 356 T6 alu-
minum. Use of incompatible antifreeze could
damage the heat exchanger and will void the
product warranty.
The antifreeze must be maintained per the
specifications of the manufacturer. Failure to
do so will result in the warranty being voided.
Follow the antifreeze manufacturer's instruc-
tions on determining the proper ratio of an-
tifreeze to water for the expected low tem-
perature conditions and for maintaining the
antifreeze solution from year to year.
e. DO NOT USE AUTOMOTIVE ANTIFREEZE,
as the type of corrosion inhibitors used will coat
the boiler's heat transfer surfaces and greatly re-
duce capacity and efficiency.
f. Use of antifreeze in any boiler will reduce
heating capacity by as much as 10-20%,
due to differing heat transfer and pumping
characteristics. This must be taken into con-
sideration when sizing the heating system,
pump(s) and expansion tank. Consult anti-
freeze manufacturer's literature for specific
information on reduced capacity.
g. Water content of the boiler is 2,6 gallons
(10 liters).