Daikin EWAPC12AJYNN [10/41] Specifications
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Daikin EWAPC12AJYNN [10/41] Specifications

Daikin EWAP900AJYNN [10/41] Specifications
• Chillers • R-407C • EWAP-AJYNN
1
3
• Hydronic Systems • Chillers
10
3 Specifications
Control panel
9 Field power connection, control interlock terminals, and unit control system should be centrally located in an electric panel (IP 54). Power and
starting controls should be separate from safety and operating controls in different compartments of the same panel.
9 Starting will be star/delta type as standard feature.
9 Power and starting controls should include fuses and contactors for each compressor winding and fan motors. Operating and safety controls should
include energy saving control; emergency stop switch; overload protection for compressor motor; high and low pressure cut-out switch (for each
refrigerant circuit); anti-freeze thermostat; cut-out switch for each compressor.
9 All of the information regarding the unit will be reported on a display and with the internal built-in calender and clock that will switch the unit ON/OFF
during day time all year long.
9 The following features and functions shall be included:
• resetting chilled water temperature
by controlling the return water temperature or by a remote 4-20 mA DC signal or by controlling the external
ambient temperature;
• soft load function
to prevent the system from operating at full load during the chilled fluid pulldown period;
• password protection
of critical parameters of control;
• start-to-start and stop-to-star timers
to provide minimum compressor off-time with maximum motor protection;
• communication capability
with a PC or remote monitoring;
• discharge pressure control
through intelligent cycling of condenser fans;
• lead-lag selection
by manual or automatically by circuit run hours;
• double set point
for brine unit version;
• scheduling
via internal time clock to allow programming of a yearly start-stop schedule accommodating weekends and holidays.
Display Capabilities
The controller as a minimum shall be capable of monitoring and displaying the following data:
Analogue Inputs (AI)
Digital Inputs (DI)
1 Entering Evaporator fluid Temp. 1 Control switch one per comp.
2 Leaving Evaporator fluid Temp. 2 Evaporator Fluid flow switch
3 Outside Air Temp 3 Phase monitor
4 Not Used 4 Double Setpoint (Ice Mode)
5 Discharge Press., one per comp. 5 High Press. Switch, one per compressor
6 Discharge Press., one per comp. 6 High Press. Switch, one per compressor
7 Setpoint Override (Setpoint Reset) 7 Low Press. Switch, one per compressor
8 Demand Limit or Current Limit (Site Selectable) 8 Oil Press. Switch, one per compressor
9 % Capacity Signal, one per comp. 9 Transition Fault, one per compressor
10 % Capacity Signal, one per comp. 10 Discharge Temp. Switch, one per comp.
11 External Alarm
Standard Customer Interfaces
The controller as a minimum shall be capable of providing the following interlocks: -
Chiller Enable Signal: Digital Input,
customer contact must be capable of handling 110Volts, 50HZ, 1Amp.
Chiller Common Fault: Volt free, normally open, digital contact,
Must be capable of switching 250V, 50HZ, 1Amp.
Pump Enable Signal: Volt free, normally open, digital contact,
Must be capable of switching 250V, 50HZ, 1Amp.
Setpoint Override: 4 – 20 mA DC analoque input signal.
Demand Limit: 4 – 20 mA DC analoque input signal.
Or
Current Limit: 4 – 20 mA DC analoque input signal.
Optional Customer Interfaces
Compressor Running Signals: Volt free, normally open, digital contact,
Capable of switching 250V, 50HZ, 1Amp.
Optional High Level Communications Interface
The controller as a minimum shall be capable of providing the data shown in the above list and document, using the following options:
Option A
RS485 Serial card Option B RS232 Serial card
Option C
LonWorks interface to FTT10A Transceiver. Option D Bacnet Compatible
Option E
Use of Compass Points (manufactured by North Communications) to allow communications with Such as Honeywell, Satchwell, Johnson
Controls, Trend etc.

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