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.
WARNING
Do not mount any additional controls, such as relays, in the power panel. Do not run power and control
wiring through the power panel that is not connected to the power 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.
Power wiring
CAUTION
These units are suitable for 460 V, 3-phase, 60 Hz nominal supplies only.
Conduct all electrical wiring in accordance with local regulations. Route correctly sized cables to the
cable entries in the power panel.
In accordance with UL 60335, it is the responsibility of the user to install overcurrent 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 through the same cable entry.
WARNING
All sources of supply to the unit must be taken through a common point of isolation, which is not
supplied by Johnson Controls.
Single point power supply wiring
All models require one field-provided 460 V, 3-phase, 60 Hz and protected earth (PE) supply to the
unit with circuit protection.
Connect the 3-phase supply to the circuit breaker in the power panel.
Connect the earth wire to the main protective earth terminal located in the power panel. The PE is
printed on the steel metal by steel seal.
YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump60
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