Electrical Connections - Scotsman MAR 78 Service Manual

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MAR SPLIT UNIT - ELECTRICAL
CONNECTION
The supply power, voltage frequency and phase
must coincide with unit nameplate. MAR Split
units are internally wired and ready for field
wiring connections which must be made in
accordance with any local codes that may apply.
Wires should be of adequate size to handle the
connected load, individually fused (see
specifications at page 5) and provided with ground
line.
The maximum allowable voltage variation, should
not exceed ten percent of the nameplate rating,
even under starting conditions.
Low voltages can cause erratic operation and
may be responsible for serious damages to the
overload switch and motor windings.
Make the necessary steps so that the MAR Split
Unit be electrically connected to the condensing
unit control box contactor as illustrated on the
following wiring diagrams representing three
different electric supply line situation which are
respectively. 230/50/3 or 400/50/3-N.
WARNING - Correct Drum rotation - The
evaporator drum drive motor being a
threephase motor wired for 380 V. It is of
estreme importance to check immediately
upon unit start-up that motor rotates
CLOCKWISE in order that gear motor
pulley rotates in the direction of the
ARROW on it indicated. Should the motor
turn counterclockwise, it is necessary to
instantly switch-off the unit and
interchange one polarity at terminal block
connection at main electric cord.
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