Pre-Installation Considerations; Air; Water Supply; Water Quality - Sub-Zero 315I Technical Service And Parts Manual

Installation Information

PRE-INSTALLATION CONSIDERATIONS

To properly make and store ice, the model 315I requires
access to air, potable water, 115 volts AC electricity and
a drain. The ice machine must be installed indoors in a
controlled environment.

Air

The model 315I uses a fan to take in room air through
the front right side of the kickplate/grille and discharge
warm air out the left side of the kickplate/grille. (See
Figure 2-1) Airflow through the kickplate/grille must
never be obstructed. Doing so will cause a decrease in
performance and proficiency, and possible damage to
the ice machine.
The minimum air temperature the ice machine will oper-
ate in is 50°F/10°C, and the maximum air temperature
is 100°F/38°C.
Warm Air Out
Figure 2-1. Condenser Air Flow

Water Supply

The model 315I requires a continuous supply of potable
water at no less than 20 p.s.i.g. of flowing pressure.
Static water pressure should not exceed 80 p.s.i.g.
The minimum water temperature that the ice machine
will operate with is 40°F/4°C, and the maximum water
temperature 100°F/38°C.
The roughed-in water supply line should be a 1/4" O.D.
copper tube connected to the house supply. An easily
accessible shut-off valve should be placed between the
supply and the appliance. The shut-off valve should not
be behind the unit.
NOTE: "Self-piercing" valves should never be used, as
they are prone to clogging with minerals and sediment.
Regular saddle valves are available from local Sub-
Zero distributors/dealers (part #4200880).
A line filter is required when the water supply has a high
mineral content.
NOTE: All plumbing must meet local codes.
#3757320 - Revision B - August, 2005
Model 315I (UC Ice Maker)

Water Quality

There is no such thing as "pure" water. All water,
including potable water supplied by municipalities, con-
tains some "impurities". Water absorbs impurities from
the air as it rains and/or as it flows through the the
ground. Some of the impurities are solid particles,
referred to as suspended solids, and can be removed
from the water with a fine particle water filter. Other
impurities are chemically bonded to the water mole-
cules, referred to as dissolved solids, and cannot be fil-
tered out.
Ice made by the model 315I will have a lower mineral
content than the water it is made from. What makes
this possible is the fact that anything dissolved in water
lowers the water's freezing point. Because of this,
"purer" water will freeze first in the ice making molds.
Most of the impurities or minerals will wash into the
reservoir where they may form hard deposits known as
scale. The model 315I dilutes this concentration of min-
erals by over-filling the reservoir during the harvest
cycle (with the excess water flowing down the drain with
most of the impurities). Approximately three quarts of
water flow into the unit each cycle. Approximately one
quart of that rinses the reservoir and goes down the
drain carrying the impurities.
Some impurities will inevitably remain, sticking to parts
of the ice machine, causing malformed ice cubes. This
build up of mineral scale can shorten the life of the unit.
To keep the ice machine operating properly, these
impurities or minerals will have to be dissolved regularly
Cool Air In
with an acid wash ice machine cleaner. (See Ice
Making System Cleaning instructions in the
Maintenance, Cleaning & Adjustments section of this
manual.)
If the local water supply has high levels of impurities or
minerals, a water filtering system may be needed. A
proper water filter can remove taste and odors as well
as particles from the water before it reaches the ice
machine.
In-line water filters are the most common. Other meth-
ods of water treatment for dissolved solids include
reverse osmosis (R.O.) and polyphosphate feeders. If
a reverse osmosis system is used it should include post
treatment to satisfy the R.O. water's "aggressiveness".
Deionized water is not recommended.
Because water softeners exchange one mineral for
another, Sub-Zero does NOT recommend their use for
the ice machine. Softened water may result in white,
mushy cubes that stick together.
Sub-Zero suggests that if in doubt about the water qual-
ity of the local water supply, a local point of use special-
ist be contacted for recommendations on water filtering
or treatment.
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