Manitowoc S model, Installation, Use & Care Manual

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Installation Instructions Section 2
2-12
Part Number 000002477 3/08
Electrical Service
GENERAL
VOLTAGE
For both the Ice Machine Head Section and the CVD®
Condensing Unit, the maximum allowable voltage
variation is ±10% of the rated voltage at ice machine
start-up (when the electrical load is highest).
All electrical work, including wire routing and grounding,
must conform to local, state and national electrical
codes. The following precautions must be observed:
• The ice machine must be grounded.
• A separate fuse/circuit breaker must be provided for
each condensing unit.
• A qualified electrician must determine proper wire
size dependent upon location, materials used and
length of run (minimum circuit ampacity can be used
to help select the wire size).
• The maximum allowable voltage variation is +/-10 of
the rated voltage at ice machine start-up (when the
electrical load is highest).
• Check all green ground screws in the control box and
verify they are tight before starting the ice machine.
Incorrect polarity can lead to erratic ice machine
operation and a safety issue. This is especially critical on
230 volt / 50 cycle ice machines.
FUSE/CIRCUIT BREAKER
The ice machine head section and condensing unit are
wired independently from each other.
Ice Machine Head Section
The ice machine head section does not require a
dedicated circuit breaker.
CVD® Condensing Unit
A separate fuse/circuit breaker must be provided for
each condensing unit. Circuit breakers must be H.A.C.R.
rated (does not apply in Canada).
MINIMUM CIRCUIT AMPACITY
The minimum circuit ampacity is used to help select the
wire size of the electrical supply. (Minimum circuit
ampacity is not the ice machine’s running amp load.)
The wire size (or gauge) is also dependent upon
location, materials used, length of run, etc., so it must be
determined by a qualified electrician. Manitowoc Ice
requires minimum #8 AWG for S2170C condensing unit
applications.
GROUND FAULT CIRCUIT INTERRUPTER
Ground Fault Circuit Interrupter (GFCI/GFI) protection is
a system that shuts down the electric circuit (opens it)
when it senses an unexpected loss of power,
presumably to ground. Manitowoc Ice, Inc. does not
recommend the use of a GFCI/GFI circuit protection with
our equipment. If code requires the use of a GFCI/GFI
then you must follow the local code. The circuit must be
dedicated, sized properly and there must be a panel
GFCI/GFI breaker. We do not recommend GFCI/GFI
outlets as they are known for more intermittent nuisance
trips than panel breakers.
!
Warning
All wiring must conform to local, state and national
codes.
! Warning
The ice machine and condensing unit must be
grounded in accordance with national and local
electrical codes.
Important
Observe correct polarity of incoming line voltage.