Electrical Service - Manitowoc P Series Installation, Use And Care, And Service Manual

Section 2

Electrical Service

GENERAL
All wiring must conform to local, state and national
codes.
VOLTAGE
The maximum allowable voltage variation is ± 10%
of the rated voltage at compressor start-up (when the
electrical load is highest).
The ice machine must be grounded in accordance
with national and local electrical codes.
P-520 - P-530 - ICE MACHINES
Ice Machine
P-520 and P-530
CONDENSING UNIT
Refer to nameplate for correct voltage and
amperage ratings.
Scroll compressors will compress in one direction
of rotation only. Three phase compressor motors are
capable of running in either direction. Interchanging
any two of the three main power leads will reverse
the direction of rotation.
Verifying 3 Phase Direction of Rotation
Complete the entire installation of the ice machines
and condensing unit. Energize one ice machine and
the condensing unit, and monitor the suction and
discharge pressures.
WARNING
WARNING
Voltage/Phase/Cycle
115/1/60
Installation Instructions
FUSE/CIRCUIT BREAKER
A separate fuse/circuit breaker must be provided for
each ice machine. 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.
Maximum Fuse/Circuit Breaker
20
Symptoms of incorrect 3 phase rotation:
1. Noisy compressor operation.
2. Low amp draw
3. Elevated suction pressure.
4. Decreased head pressure
Verify correct compressor rotation on
Minimum Circuit Amps
16
CAUTION
three phase units.
2-3