4
S U B - Z E R O
M O D E L S 3 1 5 I
A N D
3 1 5 I P
I N S T A L L A T I O N
I C E M A K E R
R E Q U I R E M E N T S
To properly make and store ice, the Model
315I(P) requires access to air, potable water,
115 V AC electrical supply and a drain. The
ice maker must be installed indoors, in a
controlled environment.
A I R S U P P LY
The ice maker uses a fan to take in room air at
the front of the ice maker through the right
side of the kickplate/grille. It discharges warm
air out the left side of the kickplate/grille.
Anything placed in front of the kickplate/grille
will restrict air flow and cause a decrease in
performance and efficiency. The minimum air
temperature the ice maker will operate in is
50˚F (10˚C), and the maximum is 100˚F (40˚C).
W A T E R S U P P LY
The ice maker requires a continuous supply of
potable water at no less than 20 psi (1.4 bar) of
flowing pressure. Static water pressure should
not exceed 80 psi (5.5 bar). The minimum
water temperature the ice maker will operate
in is 40˚F (5˚C), and the maximum is 100˚F
(40˚C).
W A T E R Q U A L I T Y
There is no such thing as “pure” water. All
water, including potable water supplied by
municipalities, contains some impurities.
Water absorbs impurities from the air as rain
and as it flows through the ground. Some of
the impurities are solid particles; these are
known as suspended solids and a fine particle
filter will remove them. Other impurities are
chemically bonded to the water molecules and
cannot be filtered out; these are called
dissolved solids.
Ice made by the Model 315I(P) will have a
lower mineral content than the water from
which it was formed.
Water with fewer impurities will freeze more
quickly. This occurs because impurities cause
the water temperature to rise. This concen-
trates most of the impurities in the ice maker
water reservoir where they may form hard
deposits known as scale. The Model 315I(P)
dilutes the concentration of minerals by over-
filling the reservoir during the harvest cycle
(with the excess water flowing down the
drain). About three quarts of water flow into
the unit each cycle. About one quart of that
rinses the reservoir and goes down the drain.
Some impurities will inevitably remain and will
stick to the inner parts of the ice maker result-
ing in malformed ice cubes. Built up mineral
scale can shorten the life of your ice maker.
To keep the ice maker operating properly,
these impurities or minerals will have to be
regularly dissolved by an acid cleaning using
Sub-Zero ice maker cleaner. Directions for
cleaning the Ice Making System are on
page 18.
In general, it is always a good idea to filter the
water. A water filter, if it is the proper type, can
remove taste and odors as well as particles.
Some methods of water treatment for
dissolved solids include reverse osmosis and
polyphosphate feeders. A reverse osmosis
system should include post treatment to
satisfy the reverse osmosis water’s ”aggres-
siveness”. Deionized water is not recom-
mended.
Because water softeners exchange one mineral
for another, Sub-Zero does not recommend
their use for ice makers. Where water is very
hard, softened water may result in white,
mushy cubes that stick together.
If there are questions about the purity of
your water, contact a local point-of-use water
specialist in your area for recommendations on
water treatment.
