CGWH-SVX01D-E418
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 4
and 7 °C with R407C.
• sub-cooling: difference between
liquid temperature and bubble
point temperature. Normal
subcooling should be within 2
and 10°C with R407C.
• Condenser approach: difference
between dew point temperature
in high pressure and condenser
air inlet temperature. Normal
value on standard unit with
R407C, 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 about + 2-3°C.
Final check:
When the unit is operating correctly:
• Check that the unit is clean and
clear of any debris, tools, etc…
• 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
the nearest Trane office.
• Do not start-up a motor whose
insulation resistance is less than
2 meghoms
• Phase imbalance should not be
greater than 2%.
• The voltage supplied to motors
should be within 5% 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 consult Trane technician.
• Excess oil in compressor
can damage the compressor.
Before adding oil, consult Trane
technician. Use only Trane
products recommended.
• 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.
CAUTION !
• The chilled water circuit may be
under pressure. Bring down this
pressure before opening up the
system to rise 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.
Refrigerant charge - CCUH
After system pressure and
vacuum testing, fill up unit with
refrigerant as per indicated in Table
14. The refrigerant complement
will be charged according to the
diameter and the length of the
refrigerant piping to obtain the
correct subcooling temperature:
Dt subcooling = 5°C for a liquid
temperature of 40°C.
Oil charge
The oil quantity for the split system
must be adjusted according to
the diameter and length of the
refrigerant piping.
Table 16 - Oil charge per compressor
Compressor L
10T 3.8
15T 6.6
CAUTION! Use exclusively PEO oil
recommended by Trane.
CCUH is delivered with a nitrogen
holding charge.
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