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USER MANUAL – Release 1.2 of 01/01/2010
Page 12 of 191
Version: 02/03/2010
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Allows maintenance of the circuit
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Allows "partialised" working of the unit
Possibility of enabling/disabling the individual compressor
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Maintenance of the individual compressor
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Malfunction
Complete management of pump down function:
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With dedicated pressure switch
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Timed
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Via the low pressure switch
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Via the low pressure transducer
Circuit unloading function:
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From evaporator inlet high water temperature
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From condenser inlet high water temperature (unit with heat recovery) – Not Available
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From high condensing pressure
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From low evaporating pressure
Controlled loads maintenance signal function:
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Compressors
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Evaporator pumps
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Condenser pump
Circuit auxiliary relay function:
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Four completely configurable relay outputs, also released from normal working of the unit controlled,
managed by means of NTC or PTC temperature probes or with 4÷20mA – 0.5 Volt pressure transducer
Weekly working in energy saving mode:
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Up to three daily time bands (devices with RTC option)
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From digital input
Weekly working with automatic switch on and switch off:
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Up to three daily time bands (devices with RTC option)
Dynamic set-point function:
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Managed by NTC or 4÷20mA input
Changeover function:
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Automatic changeover between cooling and heating by NTC input
Remote OFF function:
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From configurable digital input
Remote heating cooling function:
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From digital input with configurable logic
Hot start function:
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Air/air unit
Defrost management:
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In temperature in pressure or with both (combined control)
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Forced defrost for start-up with low external air temperatures
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From digital input or timed
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Manual using the relevant key
Boiler function:
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With integration heaters
N° 2 outputs for the proportional control of the condensing fan speeds via external module (inverter
or single/three phase phase cut) with configurable signal:
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PWM
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0÷10 Volt
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4÷20 mA
N° 6 outputs for 0÷10V proportional or ON/OFF control
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To control the servomotors working in free cooling or heat recovery mode
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For driving an external relay
Complete alarms management
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With internal data logger alarms (up to 100 events)
Up to n° 2 programmable remote LCD terminals with customisable values display
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with NTC probe on board for room temperature display and temperature control (Not Available).
Supervision/tele-assistance/remote monitoring
for complete control and supervision from local and
remote
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By means of network output with ModBus TCP / IP protocol (INTERNET / INTRANET)
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Directly by telephone line (MODEL WITH INTERNAL MODEM)
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Indirectly by means of GSM modem or XWEB serial modem (MODEL WITH RS232 OUTPUT
PREPARATION)
