Main Control Software Features - Daikin EWWQ-AJYNN Service Manual

ESIE07-05
1.3

Main Control Software Features

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Part 2 – Functional Description
Control of evaporator outlet or condenser outlet or both temperature.
Control of leaving water within a ± 0.1 °C (with a steady-state load).
Management of sudden load reduction up to 50% with max 3°C controlled temperature obscillation
Readout of all unit operating main parameters (temperature, pressures, etc.)
Automatic control of primary evaporator and condenser pumps.
Condensation control with step logic, single or double fan speed controllers and mixed step+speed
control (speedtroll)
Control up to 4 steps of cooling tower plus bypass valve with proportional signal 0-10 Vdc
Setting of a double setpoint with local or remote switch. This function allows to modify the local
setpoint between two values previously settled.
Setpoint override using an external signal (4-20 mA), outside ambient temperature or evaporator
return temperature.
Adjustable Max Pull-Down rate reduces under-shoot during loop pull-down.
Hot Chilled Water Start feature allows the unit startup without any problem also with high
temperature evaporator water.
SoftLoad feature reduces electrical consumption and peak demand charges during loop pulldown.
Unit Limiting feature allows to limit electrical consumption based either on current absorption
(current limit (SPN)) or on demand capacity (demand limit).
Panel mounted 15 key keypad for a rapid interface. Operator can log chiller operating conditions
on the backlight display 4 line by 20 character.
Four levels of security protection against unauthorized changing.
Diagnostic System of compressors constituted by the memorization of the last ten alarms, showing
the date, the time and operating conditions at the time the alarm occurred.
Weekly and yearly start-stop time schedule
Easy integration into building automation systems via separate 4-20 mA signals for chilled water
reset and demand limiting.
Communications capabilities for remote monitoring, changing of setpoint, trend logging, alarm and
event detection, via a compatible IBM-PC where is installed MICROPLANT 2.0 software.
BAS communication capability via Modbus, LonWork, Johnson Metasys
Remote communications capabilities via modem (up to 8 chillers with Gateway Modem).
Remote communications capabilities via GSM Modem.
The Digital Controller
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