Daikin WGZ030DA, Инструкция по установке, эксплуатации и обслуживанию

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IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 14 www.DaikinApplied.com
WARNING
Improper installation can cause refrigerant migration, flood back, oil loss,
refrigerant line corrosion, or mechanical failures.
The discharge gas valves, liquid line solenoids, filter-
driers, moisture indicators, and expansion valves are all
factorymounted as standard equipment with the compressor
chiller.
For remote condenser application (WGZ-DA) such as aircooled
or evaporative condenser, the chillers are shipped with a
nitrogen/helium holding charge.
The liquid line has a shutoff valve upstream from the liquid line
solenoid valve and a copper tube cap brazed on this line after
test to seal this line for shipment. The discharge line has a ball
valve installed between the compressor and the discharge stub
tube with a copper tube cap brazed on the line after test to seal
it for shipment. Ensure the braze rod used is appropriate for
the materials being joined.
DANGER
Do not apply heat, such as a brazing torch, to a sealed unit, vessel, or
component. Internal gases can increase the internal pressure and cause a
potentially hazardous situation. Open the system when heating. The short
line between a valve and brazed end cap can be drilled to vent it. NOTE:
that the valve may leak and the entire unit charge may be open to the cap.
It is important that the unit be kept tightly closed until the
remote condenser is installed, piped to the unit and the high
side evacuated.
When the field piping has been leak tested, evacuated, and is
ready to charge, the unit valves can be opened and the system
is ready to pressure test, evacuate and charge the entire
system together at one time.
After the equipment is properly installed, leak tested, and
evacuated, it can be charged with R-410A, and run at design
load conditions. Total operating charge will depend on the
aircooled condenser used and volume of the refrigerant piping.
NOTE: On WGZ-DA units (units with remote condensers), the
installer is required to record the refrigerant charge by
stamping the total charge and the charge per circuit
on the serial plate in the appropriate blocks provided
for this purpose.
Typical Arrangements
Figure 7: Condenser Above Compressor illustrates a typical
piping arrangement involving a remote air-cooled condenser
located at a higher elevation than the compressor. This
arrangement is common when the aircooled condenser is on a
roof and the compressor and receiver are on grade level or in a
basement equipment room.
Figure 7: Condenser Above Compressor
Figure 8: Condenser and Compressor on Same Level
illustrates another common application where the aircooled
condenser is located on essentially the same level as the
compressor.
Figure 8: Condenser and Compressor on Same Level
Notice, in both illustrations, that the hot gas discharge line is
looped at the bottom and top of the vertical run. This is done
to prevent oil and condensed refrigerant from flowing back into
the compressor and causing damage. The highest point in the
discharge line should always be above the highest point in the
condenser coil. It is advisable to include a service valve at this
point to extract non-condensables from the system.
Discharge lines must be designed to handle oil properly and
to protect the compressor from damage that can result from
condensing liquid refrigerant in the line during shutdown.
Discharge line must be designed to meet the minimum
refrigerant capacity for oil entrainment per Table 3 based on
Refrigerant Piping