115Vac Control Supply Transformer; Control Panel Wiring (Terminals 13 - 19) - York MILLENNIUM YCAR0315 Installation Operation & Maintenance

Installation
Standard Units with Multi-Point
Power Supply Wiring
Standard units require two 3-phase separately fused
3-wire supplies, plus a ground per refrigerant system. One
supply to be connected to each of the power panels.
Connect each of the main 3-phase supplies to the cir-
cuit breakers, non-fused disconnect switches or termi-
nal boards located in the Power Panels or Options Panel
using lug sizes detailed in the Technical Data Section.
Connect the ground wires to the main protective ground
terminals in each Power Panel or Option Panel.
Units with Signle-point Power Supply Wiring
Units require only one 3-phase plus ground.
Connect the 3-phase supplies to the terminal block or
non-fused disconnect switch located in the options
panel using lug sizes detailed in the Technical Data
Section.
Connect a ground wire to the main protective ground
terminal.

115VAC CONTROL SUPPLY TRANSFORMER

A 3-wire high voltage to 115VAC supply transformer is
standard in the chiller. This transformer is mounted in
the Options cabinet and steps down the high voltage
supply to 115VAC to be used by the Micro panel, power
panel components, solenoids, heaters, etc.
The high voltage for the transformer primary is taken
from the chiller input to one of the systems. Fusing is
provided for the transformer.
It is important to check that the cor-
rect primary tapping has been used,
and that it conforms to the site high
voltage supply.
34
Removing high voltage power to the
chiller will remove the 115VAC sup-
ply voltage to the microprocessor cir-
cuitry and the evaporator heater. In
cold weather, this could cause serious
damage to the chiller due to evapora-
tor freeze-up. Do not remove power
unless alternate means are taken to
assure operation of the evaporator
heater.
Remote Emergency Stop Device
If required, a remote emergency stop device can be
wired into the unit. The device should be wired into ter-
minals 31 and 32 (Figures 11 and 12) in the micropro-
cessor control panel.

CONTROL PANEL WIRING (Terminals 13 - 19)

All wiring to the control panel terminal block is nomi-
nal 30VDC and must be run in shielded cable, with the
shield grounded at the panel end only. Run shielded cable
separately from mains cable to avoid electrical noise
pick-up. Use the control panel cable entry to avoid the
power cables.
The voltage free contacts must be suitable for 30VDC
(gold contacts recommended). If the voltage free con-
tacts form part of a relay or contactor, the coil of the
device must be suppressed using a standard R/C sup-
pressor. The above precautions must be taken to avoid
electrical noise which could cause a malfunction or dam-
age to the unit and its controls.
The length of cable to these terminals must not exceed
7.5 m (25 ft.) unless an optional input isolator kit is
fitted. The optional input isolator kit uses 15VDC (not
30VDC).
FORM 150.52-NM2 (1001)
YORK INTERNATIONAL