Carrier PIC 5+, Инструкции по установке, эксплуатации и обслуживанию

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2.5 - Chiller familiarization 19DV
2.5.1 - Chiller information plate
The chiller information plate is located in front of the electrical control box.
2.5.2. System components
The main components include the cooler and condenser heat exchangers in separate vessels, motor-
compressor, refrigerant, lubrication package, control panels, PIC5+ Touch Screen HMI, economizer, VFD, and
purge system.
2.5.2.1. Cooler
This vessel is located underneath the compressor. The cooler is maintained at lower temperature/pressure so
evaporating refrigerant can remove heat from water flowing through its internal tubes. Water is flowing through the
tube internals to provide comfort or process cooling.
2.5.2.2. Condenser
The condenser operates at a higher temperature/pressure than the cooler and has water flowing through its
internal tubes in order to remove heat from the refrigerant. It contains a metering device that regulates the flow of
refrigerant into the economizer.
2.5.2.3. Economizer
This chamber reduces the refrigerant pressure to an intermediate level between the evaporator and condenser
vessels. In the economizer, vapor is separated from the liquid, the separated vapor flows to the second stage of
the compressor, and the liquid flows into the cooler.
The energy removed from the vaporized refrigerant in the economizer allows the liquid refrigerant in the cooler to
absorb more heat when it evaporates and benefits the overall cooling efficiency cycle. It contains a float assembly
that regulates the flow of refrigerant into the evaporator.
2.5.2.4. Motor-compressor
This component maintains system temperature and pressure differences and moves the heat-carrying refrigerant
from the cooler to the condenser. The 19DV utilizes a two-stage back to back direct drive configuration.
2.5.2.5. Purge unit
A small independent condensing unit with compressor, separator, regenerative carbon filters heater and vacuum
pump. The purge extracts gas from condenser (or from compressor if unit is not in operation) and purifies it by
removing non-condensable gases and any water vapor that may be present.
2.5.2.6. Variable Frequency Drive (VFD)
A variable-frequency drive allows start-up and compressor motor power supply interruption. It also allows
adjustment of the compressor speed based on the required capacity. It is either factory-installed in the unit in a
cabinet that also includes the protection and power transmission elements, or not unit-mounted.
2.5.2.7. Refrigerant lubrication system
This system provides lubrication to the compressor bearing by means of a refrigerant pump.
2.5.2.8. Chiller control cabinet
This control panel includes the input and output boards (IOB), control transformer, relays, contactors, and circuit
breakers. It provides the power distribution and protection to the electrical components installed on chiller and has
the following functions:
• Communication with PIC5+ touch screen
• Communication with purge panel
• Communication with VFD
• Sensor input and outputs
• Actuators control
• Refrigerant pump control
2.5.2.9. Purge control panel
The purge panel includes the input and output board, control transformer, relays, and fuse. It provides the power
distribution and protection to the electrical components which installed in the purge system and has the following
functions:
• Communication with PIC5+ touch screen
• Sensor input and outputs
• Solenoid valve control