Daikin EWAH620TZ-XSB2 [9/102] General characteristics
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Daikin EWAH620TZ-XSB2 [9/102] General characteristics

Daikin EWAH620TZ-XSB2 [9/102] General characteristics
9/100
GENERAL CHARACTERISTICS
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 maximize chiller energy efficiency and reliability. MicroTech III is able to protect critical
components based on external signals 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 50ms, this is an additional security for the equipment.
Fast program cycle (200ms) for a precise monitoring of the system. Floating point calculations supported for
increased accuracy in Pressure / Temperature conversions.
Control section - main features
Main control features are (for more information refer to Unit Control Manual):
•
Optimized management of compressors stepless capacity control through inverter drive.
•
Display of evaporator entering/leaving water temperatures.
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Display of Ambient Temperature
•
Display of refrigerant condensing/evaporating temperatures and pressures.
•
Regulation of leaving evaporator water (cooling mode) or condenser water (heating mode).
•
Display of compressor working hours and number of compressor starts.
•
Re-start in case of power failure (automatic or manual depending on failure type).
•
Soft load (optimized management of the compressor load during the start-up).
•
Set point reset.
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Master/Slave operation (up to 4 chillers connected).
•
Variable Primary Flow Management (available as option)
Alarms signaling (for more information refer to Unit Control Manual):
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Phase loss.
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Evaporator water flow loss.
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Evaporator water freezing protection.
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External alarm.
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Low evaporator refrigerant pressure.
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High refrigerant pressure (transducer).
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High refrigerant pressure (switch).
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Low pressure ratio.
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High refrigerant discharge temperature.
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High oil pressure differential.
•
High motor temperature.
System security
The following securities are available.
•
Phase monitor.
•
Low Ambient temperature lock-out.
•
Freeze protection.
Regulation type
Proportional integral derivative regulation on the evaporator leaving water output probe.
MicroTech III
MicroTech III built-in terminal has the following features.
•
164x44 dots liquid crystal display with white back lighting. Supports Unicode fonts for multi-lingual.
•
Key-pad consisting of 3 keys.
•
Push’n’Roll control for an increased usability.
•
Memory to protect the data.
•
General faults alarm relays.
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Password access to modify the setting.
•
Application security to prevent application tampering or hardware usability with third party applications.
•
Service report displaying all running hours and general conditions.
•
Alarm history memory to allow an easy fault analysis.
Supervising systems (on request)
MicroTech III remote communication
MicroTech III is able to communicate to BMS (Building Management System) based on the most common
protocols as:

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