1-2
TO THE INSTALLER
Model C302 NPR To the Installer
1
Air-Cooled Units
Do not obstruct air intake and discharge openings.
Air-cooled units require a minimum of 3 in. (76 mm) of air
space on both sides, 3 in. (76 mm) at the rear, and
12 in. (305 mm) on the top of the unit. Minimum air
clearances must be met to ensure adequate air flow for
optimum performance.
Water-Cooled Refrigeration Units
IMPORTANT! A backflow prevention device is
required on the incoming water connection side. Please
see the applicable national, state, and local codes for
determining the proper configuration. Water pressure to
the unit must not exceed 150 psi (1034 kPa).
On the back of the unit, two additional 3/8 in. (9.5 mm)
F.P.T. water connections for condenser inlet and outlet
have been provided for easy hook-up. Permanently
connect the machine using 1/2 in. (12.7 mm) inside
diameter water lines. Flexible lines are recommended if
local codes permit. Failure to use adequate size water
lines may cause the unit to go on high head pressure and
shut down.
Depending on local water conditions, it may be advisable
to install a water strainer to prevent foreign substances
from clogging the automatic water valve.
Do not install a hand shutoff valve on the out line. Water-
cooled units are counter flow, and the water should flow
in this order: first through the automatic water valve.
Second, through the inlet located at the bottom of the
condenser. Third, through the outlet fitting located at the
top of the condenser to an open trap drain.
Important! Water pressures are pre-set at the factory.
Do not adjust the water pressure. Improper water
adjustments may cause operation discrepancies.
Water Connections
An adequate cold water supply must be provided with a
hand shutoff valve. On the back of the unit, a 3/8 in. (9.5
mm) male flare water connection has been provided for
easy hook-up. Permanently connect the machine using
1/2 in. (12.7 mm) inside diameter water lines.A flexible
line is recommended, if local codes permit.A minimum of
25 psi (172 kPa) water pressure is required to avoid
having the unit cut out the low water pressure switch. A
booster pump must be provided if this pressure is not
available.
Note: Water lines beyond 200 ft. (61 m) require 1/2 in.
(13 mm) water lines.
It is always a good practice to have a filter system to
improve the quality of the water and to avoid clogging the
operating components.
Important! The water filter (064422-SER) must be thor-
oughly flushed with water before connecting it to the
machine. This removes any loose particles present from
the manufacture of the filter that could clog the flow con-
trol. To flush the filter, connect the inlet end of the filter to
the water supply. Position the outlet end of the filter over
an empty pail. Open the water supply. Allow water to flow
through the filter until the water exiting the filter is clear.
Close the water supply. Attach the outlet end of the filter
to the machine. Reopen the water supply.
Figure 1-1
Electrical Connections
Each freezer requires one power supply. Check the data
label on the freezer for fuse, circuit ampacity, and
electrical specifications. See the wiring diagram provided
inside the control box for proper power connections.
In the United States, this equipment is intended to be
installed in accordance with the National Electrical Code
(NEC), ANSI/NFPA 70-1987. In all other areas of the
world, equipment should be installed in accordance with
INSTALL POTABLE WATER CONNECTION
WITH ADEQUATE BACKFLOW
PROTECTION TO COMPLY WITH
APPLICABLE FEDERAL, STATE, AND
LOCAL CODES.
