Daikin EWAP/EWYP 060-260, Installation Operation & Maintenance

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CG-SVX04C-E4 23
- leaving and return chilled water
temperature,
- suction temperature and pressure,
- ambient air temperature,
- blowing air temperature,
- discharge pressure and
temperature,
- liquid refrigerant temperature and
pressure,
- operating parameters:
- chilled water pressure drop
through evaporator (if no
hydraulic module is installed) or
unit available pressure. It must be
in accordance with Daikin order
write-up,
- superheat: difference between
suction temperature and dew
point temperature. Normal
superheat should be within 4 and
7 °C with R407C in cooling mode,
- sub-cooling: difference between
liquid temperature and bubble
point temperature. Normal sub-
cooling should be within 2 and
10°C with R407C in cooling mode,
- 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.
- 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 +
superheat 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.
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 Daikin 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 wait for 60
minutes for the sump heaters to
heat oil and start again. Should
this not work, consult Daikin
technician.
- Excess oil in compressor can
damage the compressor. Before
adding oil, consult Daikin
technician. Use only Daikin
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.
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.
General start-up