Trane WCVS 12H, Установка, эксплуатация и обслуживание

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TRANE ®
Electrical Wiring
15
Electrical wiring
General
All wiring should confirm to NEC or
applicable codes as per requirements
of local codes and regulations. Wiring
diagrams are furnished with the units
but extra copies can be obtained from
Trane Sales Offices.
The installing contractor is to provide
and install fused disconnect switches,
wiring up to the unit (as indicated in the
wiring diagrams), water circulating
pumps and pump starting
equipments, cooling tower controls
and relays as indicated in the wiring
diagrams. Electrical data on
compressors and evaporator fan
motors are available on Table 1.
Check the available power supply
against the nameplate information.
Voltage at the unit must be 6%
of the voltage indicated on the
nameplate. Voltage within the phases
must be balanced within 2%.
All factory supplied wiring are colored
and numbered. Always check the
numbers on the wiring to the unit
terminal block against that in the wiring
diagram. Should there be any
inconsistency, please do not hesitate to
contact the nearest Trane Sales &
Service Office.
Safety Controls
Safety controls for the WCVS water-
cooled packaged units are indicated
in Table 2. Please note that the high-
low pressure cut-outs are non-
adjustable, factory pre-set switches.
WARNING: PHASE ROTATION FOR
SCROLL COMPRESSORS IS
CRITICAL.
PLEASE ENSURE THAT WIRING TO
THE COMPRESSOR TERMINALS ARE
CONNECTED IN THE CORRECT
PHASE SEQUENCES. PLEASE
REFER DIAGRAM ON FIGURE 6.
Figure 6 -Scroll Compressors
Terminal Wiring
LINE 1 & 2 TO BE CONNECTED IN
SERIES WITH CONTROL.
•
Phase Sequencing
The scroll compressor is an
unidirectional compressor and to
function properly it must be phase
properly. The Compressor data sheets
show the correct phasing for the
compressor. The scroll compressor
will run without damaging itself if the
phasing is improper, but it will not pump
refrigerant and will draw minimal
current. if the compressor is incorrectly
phased upon start up, it will eventually
shutoff on the internal winding
thermostat. Depending on the
conditions it could take up to 30 minutes
to trip the internal winding thermostats.
The compressor will be noisy, vibrate
excessively and the oil sump will
become warm when running
backwards.
It is important that the proper rotation
of the scroll compressor be established
before the compressor is started.
Proper motor rotation requires
confirmation of the electrical phase
sequencing of the power supply. To
confirm the correct phase sequence
(ABC), use a device similar of the Model
45 Associated Research Phase
indicator as shown in Figure 7.
Figure 7 - Model 45 Associated
Research Phase Indicator
WARNING: The supply to the unit
must be properly grounded.
Disconnect electrical power source
when power supply wirings are
installed. Failure to do so may result
in injury or death from electric shock.
PHASING TO BE CONNECTED AS
SHOWNTO PREVENT REVERSE
ROTATION.
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