JOHNSON CONTROLS
57
SECTION 3 - HANDLING, STORAGE, INSTALLATION AND REASSEMBLY
FORM 201.30-ICOM1 (519)
ISSUE DATE: 05/22/2019
3
UNIT PIPING
Compressor lubricant piping and system refrigerant
piping are factory installed on all units shipped assem-
bled. On units shipped dismantled, the lubricant piping
and system oil return should be completed under the
supervision of a Johnson Controls representative, us-
ing furnished material.
ELECTRICAL CONNECTION
The following connection recommendations are in-
tended to make sure the unit is operated safely. Failure
to follow these recommendations could cause harm
to persons or damage 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 pre-
cautions 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 wiring the power connection, do
not switch on main power to the unit.
Some internal components are live when
the main power is switched on, which
must only be done by authorized persons
familiar with starting, operating, and
troubleshooting this type of equipment.
POWER WIRING
All electrical wiring should be carried out in accor-
dance with local regulations. Route properly sized
cables to cable entries on the unit.
In accordance with local codes, NEC codes, UL and
CE standards, it is the user's responsibility 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 the 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 Johnson Controls).
POWER SUPPLY WIRING
Units require one 3-phase supply, plus earth. Connect:
• The 3-phase supplies to the circuit breaker located
in the panel.
• A suitably sized earth wire to the PE terminal in
the panel.
115VAC CONTROL SUPPLY TRANSFORMER
A 3-wire high voltage to 115VAC supply transformer
is standard in the chiller. This transformer is mounted
in the cabinet and steps down the high voltage supply
to 115VAC to be used by the controls, VSD, feed and
drain valve controller, valves, solenoids, heaters, etc.
The high voltage for transformer primary is taken from
the chiller input. Fusing is provided for transformer.
Removing high voltage power to the
chiller will remove the 115VAC supply
voltage to the control panel circuitry.
CONTROL WIRING
All control wiring utilizing contact closures to the con-
trol panel terminal block is nominal 115VAC and must
be run in shielded cable, with the shield grounded at
the panel end only, and run in water tight conduit. Run
shielded cable separately from mains cable to avoid
electrical noise pick-up. Use the control panel cable
entry to avoid the power cables.
Voltage-Free Contacts
Voltage-free contacts connected to the panel must be
suitable for 115VAC 10 mA (gold contacts recommend-
ed). If the voltage-free contacts form part of a relay or
contactor, the coil of the device must be suppressed us-
ing a standard R/C suppressor such as P/N 031-00808-
000. The above precautions must be taken to avoid elec-
trical noise, which could cause a malfunction or damage
to the unit and its controls.
Chilled Liquid and Condenser Pump Starter
Terminals 23 and 24 on 1TB close to start the chilled
liquid and/or condenser water pumps. This contact can
be used as a master start/stop for the pumps in conjunc-
tion with the daily start/stop schedule.
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