PRODUCT DESIGN
17
As this motion occurs, the pockets between the two forms
are slowly pushed to the center of the two scrolls while
simultaneously being reduced in volume. When the pocket
reaches the center of the scroll form, the gas, which is now
at a high pressure, is discharged out of a port located at the
center.
During compression, several pockets are being compressed
simultaneously, resulting in a very smooth process. Both
the suction process (outer portion of the scroll members)
and the discharge process (inner portion) are continuous.
ELECTRICAL WIRING
The units are designed for operation on 60 hertz current and
at voltages as shown on the rating plate. All internal wiring
is complete. Ensure the power supply to the compressor
contactor is brought to the unit as shown on the supplied unit
wiring diagram. The 24V wiring must be connected between
the unit control panel and the room thermostat.
LINE VOLTAGE WIRING
Power supply to the unit must be N.E.C. Class 1, and must
comply with all applicable codes. The unit must be electri-
cally grounded in accordance with the local codes or, in their
absence, with the latest edition of the National Electrical
Code, ANSI/NFPA No. 70, or in Canada, Canadian Electri-
cal Code, C22.1, Part 1. A fused disconnected must be
provided and sized in accordance with the unit minimum
circuit ampacity.
The best protection for the wiring is the smallest fuse or
breaker which will hold the equipment on line during normal
operation without nuisance trips. Such a device will provide
maximum circuit protection.
WARNING
DO NOT EXCEED THE MAXIMUM OVERCURRENT
DEVICE SIZE SHOWN ON THE UNIT DATA PLATE.
All line voltage connections must be made through weather
proof fittings. All exterior power supply and ground wiring
must be in approved weather proof conduit. Low voltage
wiring from the unit control panel to the thermostat requires
coded cable. See the following figures for ground level and
rooftop wiring.
JUNCTION BOX
The unit transformer is connected for 230V operation. If the
unit is to operate on 208V, reconnect the transformer primary
lead and the induced draft blower leads as shown on the unit
wiring diagram.
