Check that the pressure drop on the
condenser is in the tolerance of
the fan
- Consult "Selection of the proper
available static pressure"
- If the pressure does not comply
then correction must be done
either by changing pressure drop
on the duct or by modifying the
pulley or the motor.
- liquid refrigerant temperature and
pressure,
- operating parameters:
- chilled water pressure drops through
evaporator. It must be in accordance
with Trane order write-up,
- superheat: difference between
suction temperature and dew
point temperature. Normal
superheat must be within 5°C
and 10°C,
- sub-cooling: difference between
liquid temperature and bubble
point temperature. Normal sub-
cooling should be 2 to 5°C
with 407C,
- difference between dew point
temperature in high pressure and
condenser air inlet temperature.
Normal value on standard unit with
R407C, should be 20 to 23°C.
- 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 3°C with
R407C.
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.
CGCL-SVX01B-E4 15
General start-up
WARNING!
- 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.
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.
Table 7 - Evaporator pressure drop
Water flow (l/s)
P.D. (kPa) CGCL CGCL CGCL CGCL CGCL CGCL CGCL CGCL
200 250 300 350 400 450 500 600
10 1.155 1.449 1.736 1.912 2.282 2.282 2.500 2.700
20 1.631 2.045 2.447 2.809 3.343 3.343 3.561 3.853
40 2.301 2.886 3.448 4.129 4.898 4.898 5.074 5.499
60 2.815 3.530 4.215 5.172 6.125 6.125 6.241 6.771
80 3.248 4.072 4.860 6.068 7.177 7.177 7.228 7.848
100 3.629 4.550 5.427 6.868 8.116 8.116 8.100 8.800
When ethylene glycol is added in the chilled water circuit the following
adjustment factors have to be taken in account.
Table 8 - Ethylene glycol adjustment factors
LWTE PCT EG Adjustment factors
(%) Flow rate Pressure drop Power Input Cooling Cap.
12 30 1.11 1.20 1.0 05 0.98
5 30 1.11 1.24 1.005 0.98
4 10 1.02 1.08 - -
0201.051.19 - -
-4 27 1.08 1.29 - -
-8 33 1.10 1.46 - -
-12 37 1.12 1.62 - -
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