23
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
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
void the warranty.
No additional controls (relays, and so on)
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 increase the risk of
electrocution. In addition, electrical noise
could cause malfunctions or damage the
unit and its controls.
POWER WIRING
Per PIN 11/12 of the unit, properly connect
the suitable power supply to unit.
All electrical wiring should be carried out in accordance
with local regulations. Route properly sized cables to the
cable entries in the bottom of the power panel.
It is the responsibility of the user to install over current
protection devices between the supply conductors and
the power supply terminals on the unit.
To ensure that no Eddy currents are set up in the power
panel, the cables forming each 3 phase power supply
must enter via the same cable entry.
All sources of supply to the unit must be
taken via a common point of isolation (not
supplied by JCI).
SINGLE POINT POWER SUPPLY WIRING
All models require one eld provided suitable power
supply + PE (Protected Earth) to the unit with circuit
protection.
Connect the 3-phase supply to the non-fused disconnect
switch located in the power panel using M12 lugs.
Connect the earth wire to the main protective earth
terminal located in the power panel using a M10 lug.
CONTROL CIRCUIT TRANSFORMER
The control circuit transformer providing the 115 V,
1Ø, 60Hz supply to the unit control system is tted in
a separate enclosure.
REMOTE EMERGENCY STOP DEVICE
If required, a remote emergency stop device may be
wired into the unit. This device should be rated at 20
amps, 115 V, AC-15. The device should be wired into
terminals L and 5 in the power panel after removing the
factory tted link.
CONTROL WIRING - VOLTAGE FREE CONTACT
All wiring to the voltage free contact terminal block
requires a supply provided by the customer. Maximum
voltage 115 VAC, 24 VDC.
The customer must take particular care deriving the
supplies for the voltage free terminals with regard to a
common point of isolation. Thus, these circuits when
used must be fed via the common point of isolation so the
voltage to these circuits is removed when the common
point of isolation to the unit is opened. This common
point of isolation is not supplied by JCI.
It is recommended that the customer wiring to these
terminals uses orange wires. This will ensure that circuits
not switched o by the units supply disconnecting
device are distinguished by color, so that they can easily
be identied as live even when the unit disconnecting
devices are o. The YORK voltage free contacts are
rated at 125 VA.
All inductive devices (relays) switched by the YORK
voltage free contacts must have their coil suppressed
using standard RC suppressors. If these precautions are
not followed, electrical noise could cause malfunctions
or damage to the unit and its controls.
CHILLED LIQUID PUMP STARTER
Terminals 23 and 24 close to start the liquid pump. This
contact is closed if there is a Leaving Liquid Temperature
Cutout or any of the compressors are running or the
daily schedule is not calling for a shutdown with the
unit switch on.
The contact must be used to ensure that
the pump is running in the event of a
Leaving Liquid Temperature Cutout.
The pump contact will not close to run the pump if the
unit has been powered up for less than 30 seconds, or
if the pump has run in the last 30 seconds, to prevent
pump motor overheating.
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