Trane R Series Installation Operation & Maintenance page 96

RTAC-SVX002A-EN
Pre-Start Checkout
2. Open the electrical disconnect or cir-
cuit protection switch that provides line
power to the line power terminal block(s)
in the starter panel (or to the unit-mount-
ed disconnect).
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, includ-
ing remote disconnects before ser-
vicing. Follow proper lockout/tagout
procedures to ensure the power can-
not be inadvertently energized. For
variable frequency drives or other
energy storing components provided
by Trane or others, refer to the appro-
priate manufacturer's literature for al-
lowable waiting periods for discharge
of capacitors. Verify with an appropri-
ate voltmeter that all capacitors have
discharged. Failure to disconnect
power and discharge capacitors be-
fore servicing could result in death or
serious injury.
Note: For additional information re-
garding the safe discharge of capaci-
tors.
3. Connect the phase sequence indi-
cator leads to the line Power terminal
block, as follows:
Tab. VIII-01 Dimensión del cable vs.
extensión máxima
Phase Seq. Lead Terminal
Black (Phase A)
Red (Phase B)
Yellow (Phase C)
4. Turn power on by closing the unit sup-
ply power fused-disconnect switch.
5. Read the phase sequence on the in-
dicator. The "ABC" LED on the face of
the phase indicator will glow if phase is
"ABC."
6. If the "CBA" indicator glows instead,
open the unit main power disconnect and
switch two line leads on the line power
terminal block(s) (or the unit mounted
disconnect). Re-close the main power
disconnect and recheck the phasing.
CAUTION
Compressor Damage!
Do not interchange any load leads
that are from the unit contactors or
the motor terminals. Doing so may
damage the equipment.
7. Reopen the unit disconnect and dis-
connect the phase indicator.
Water System Flow Rates
Establish a balanced chilled water flow
through the evaporator. The flow rates
should fall between the minimum and
maximum values given on the pressure
drop curves.
Chilled water flow rates below the mini-
mum values will result in laminar flow,
which reduces heat transfer and causes
either loss of EXV control or repeated
nuisance, low temperature, cutouts.
Flow rates that are too high can cause
tube erosion in the evaporator.
Water System Pressure Drop
Measure water pressure drop through
the evaporator at the field-installed pres-
sure taps on the system water piping.
Use the same gauge for each measure-
ment. Do not include valves, strainers fit-
tings in the pressure drop readings.
Pressure drop readings should be ap-
proximately those shown in the Pressure
Drop Charts in the Mechanical Installa-
tion section.
CH530 Set-Up
Use of TechView service tool is required
to view and adjust most settings. Refer
to the Controls Interface section for in-
struction on adjustment of the settings.
Daily Unit Start-Up
The time line for sequence of opera-
tion is shown at the end of this section
L1
and depicts the nominal delays and se-
L2
quences that a chiller would experience
L3
during a typical operational cycle. The
time line begins with a power up of the
main power to the chiller. The sequence
assumes a 2 circuit, 2 compressor air-
cooled RTAC chiller with no diagnostics
or malfunctioning components. External
events such as the operator placing the
chiller in Auto or Stop, chilled water flow
through the evaporator, and application
of load to the chilled water loop causing
loop water temperature increases are
depicted and the chillers responses to
those events are shown, with appropri-
ate delays noted. The effects of diagnos-
tics, and other external interlocks other
than evaporator water flow proving, are
not considered.
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