General Outline ESIE10-01
1–10 Part 1 – System Outline
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Refrigerant circuit Each unit has 2 or 3 independent refrigerant circuits and each one includes:
Q Compressor with integrated oil separator.
Q Air Cooled Condenser.
Q Electronic expansion valve.
Q Evaporator.
Q Discharge line shut off valve.
Q Liquid line shut off valve.
Q Suction line shut off valve (optional).
Q Sight glass with moisture indicator.
Q Filter drier.
Q Charging valves.
Q High pressure switch.
Q High and low pressure transducers.
Electrical control
panel
Power and control are located in two sections of the main panel that is manufactured to ensure
protection against all weather conditions. The electrical panel is IP54 and (when opening the doors)
internally protected with Plexiglas panel against possible accidental contact with electrical
components (IP20). The main panel is fitted with a main switch interlocked door.
Power Section
The power section includes compressors fuses, fan circuit breaker, fan contactors and control circuit
transformer.
MicroTech III controller
MicroTech III controller is installed as standard; it can be used to modify unit set-points and check
control parameters. A built-in display shows chiller operating status plus temperatures and pressures
of water, refrigerant and air, programmable values, set-points. A sophisticated software with predictive
logic, selects the most energy efficient combination of compressors, EEXV and condenser fans to
keep stable operating conditions to maximise chiller energy efficiency and reliability. The compressors
are automatically sequenced to ensure equal operating hours and number of starts. MicroTech III is
able to protect critical components based on external signs from its system (such as motor
temperatures, refrigerant gas and oil pressures, correct phase sequence, pressure switches and
evaporator). The input coming from the high pressure switch cuts all digital output from the controller
in less than 50 ms, this is an additional security for the equipment. Fast program cycle (200 ms) for a
precise monitoring of the system. Floating point calculations supported for increased accuracy in P/T
conversions.
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