Technical data

4.19 Electrical Connection
The following connection recommendations are
intended to ensure safe and satisfactory operation of the
unit. Failure to follow these recommendations could
cause harm to persons, or damage to the unit, and may
invalidate the warranty.
No additional controls (relays, etc.) should
be mounted in the control panel. Power
and control wiring not connected to the
control panel should not be run through
the control panel. If these precautions are
not followed it could lead to a risk of
electrocution. In addition, electrical noise
could cause malfunctions or damage the
unit and its controls.
After connection do not switch on mains
power to the unit until it has been
commissioned by York Authorised
personnel. Some internal components are
live when mains is switched on.
On units shipped disassembled, after installation of the
control panel, control wiring must be completed
between unit components and control panel or solid
state starter, when used, using wiring harness
furnished.
No changes in unit wiring from that shown on
drawings delivered shall be made without
prior approval of the York representative.
All electrical wiring should be carried out
in accordance with local regulations.
Customer supplied isolators and fuses
may be installed next to the unit, avoiding
locations close to refrigerant and water
lines.
All sources of supply to the unit must be
taken via a common point of isolation (not
supplied by York).
After connection DO NOT switch on mains
or control system power to the unit. Some
internal components are live as soon as
mains is switched on the unit and this must
only be done by authorised persons.
The main 'START/RUN/STOP-RESET' selector switch
on the control centre must remain in 'STOP/RESET'
position until the unit is commissioned by authorised
personnel. If the switch has been placed in the 'RUN' or
'START' position before commissioning, this must be
reported to York otherwise warranty may be invalidated.
4.20 Power Wiring
Units are suitable for 380/400V - 3 Ph - 50 Hz or 415V - 3
Ph - 50 Hz nominal power supplies only. The correct
electrical power supply is given on the unit data plate,
which also details the motor connection diagrams.
4.20.1 Units with Electro-Mechanical Starter
(field supplied)
Units supplied without a starter require one three phase
supply to the motor from a remote electro mechanical
starter (field supplied). A 115 Vac - 1Ph - 50 Hz supply of
15 amp capacity is also required for the control centre.
An optional control transformer (1-1/2 KVA required) is
available to meet this requirement.
Electro-Mechanical starters for the unit must
be furnished in accordance with York
Standard R-1079 to provide the features
necessary for the starter to function properly
with the York control system.
Route the cables forming the 3 phase power supply via
the same hole in the motor terminal box gland plate,
using a suitable cable gland, to ensure that no eddy
currents are set up in the metal gland plate. If separate
entries for each cable forming the 3 phase supplies are
used, the metal gland plate must be replaced by a
non-metallic gland plate.
DO NOT cut wires to final length or make final
connections to the motor or starter power input
terminals until approved by a York representative. To
ensure correct motor rotation the starter power input
and starter to motor connections must be checked with a
phase sequence indicator in the presence of the York
representative.
Route the main earth cable via the motor terminal box
gland plate to the main earth connection stud on the side
of the box.
Route the single phase control supply to the control
centre with bare wire ends of maximum cable size
4mm². Also connect an earth wire to the earth terminal
using the M4 lug.
035L02381-GB0 4-7