Trane AquaStream 2 CGWN Series Installation Operation & Maintenance page 30

30
General Start-up
Operating parameters:
• chilled water pressure drop
through evaporator (if no hydraulic
module is installed) or unit
available pressure. It must be
in accordance with Trane order
write-up.
• superheat: difference between
suction temperature and dew point
temperature. Normal superheat
should be within 5 and 7 °C.
• sub-cooling: difference between
liquid temperature and bubble
point temperature. Normal
subcooling should be within 2 and
10°C.
• Condenser approach: difference
between dew point temperature
in high pressure and condenser air
inlet temperature. Normal value
on standard unit, should be 15 to
23°C at full load.
• Evaporator approach: difference
between outlet water temperature
and dew point temperature in
low pressure. Normal value on
standard unit, without Ethylene
glycol in chilled water, should be
between 2 and 5°C.
Final check
When the unit is operating correctly:
• Check that the unit is clean and
clear of any debris, tools, etc.
• Ensure all valves are in operating
position.
• Close control and starter panel
doors and check panels fixation.
CAUTION
For the warranty to apply, any
start-up carried out directly by the
customer must be recorded in a
detailed report, which must be sent
as soon as possible to your local
Trane office.
• Do not start-up a motor whose
insulation resistance is less than 2
megohms
• Phase imbalance should not be
greater than 2%.
• The voltage supplied to motors
should be within 10% of the
rated voltage on the compressor
nameplate.
• Excessive emulsion of the oil
in the compressor shows that
refrigerant is present in the oil and
the result will be that compressor
is not lubricated enough. Shut
down compressor and wait for 60
minutes for the sump heaters to
heat oil and start again. Should
this not work, consult Trane
technician.
• Excess oil in compressor can
damage the compressor.
Before adding oil, consult Trane
technician. Use only products
recommended by Trane.
• The compressors must operate
in a single direction of rotation. If
refrigerant high pressure remains
stable in the 30 seconds after
compressor start-up, immediately
shut down unit and check
the direction of rotation using
phasemeter.
WARNING!
The chilled water circuit may be
under pressure. Bring down this
pressure before opening up the
system to rinse out or fill up the
water circuit. Failure to comply with
this instruction may cause accidental
injury to maintenance personnel. If
a cleaning solution is used in the
chilled water circuit, the chiller must
be isolated from the water circuit
to avoid all the damage risks of the
chiller and evaporator water pipes.
CG-SVX06F-GB