D Series Modular Air-cooled Scroll Chillers
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6.3 Wiring of the Electric Control Cabinet
6.4 Filed Wiring
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Safety Code
(1)
All wiring shall comply with applicable codes and engineering requirements.
(2)
All field wiring shall be performed by the qualified electrician.
(3)
Never perform wiring before the power supply is cut off.
(4)
Any damage caused by the improper external wiring shall be at the installer’s expense.
WARNING
•
Only copper conductor is allowed.
◆
The power cord is wired into the internal electric box
(1)
The power cord must be routed inside the conduit.
(2)
The power cord must enter the electric box through a rubber or plastic ring to avoid any damaged
caused by the sharp edge of the metal sheet.
(3)
The power cord close to the electric box must be attached securely to prevent the terminal block of the
electric box affected by the outside force.
(4)
The unit shall be grounded reliably and never connect the ground wire with the gas fuel pipe, water
pipe, lightening rod or telephone line.
◆
Control Line
(1)
The field supplied control line shall be at a minimum 1mm
2
.
(2)
The electric box will send the control signal (220 AC, 5A) to control the chilled water pump and auxiliary
electric heater, however, never do not drive them directly through the control signal but through their
AC contactors.
(3) A reasonable length of the control line should be left outside the unit and the rest should be bundled
and fed into the electric box.
