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water. The controller has dual heating set points (heating and DHW) and can also control a three port diverting valve that directs the DHW
to the cylinder. DHW production has priority irrespective of the mode of operation of the unit. The unit is normally used with two pipe water
based change-over systems.
3.3 Accessories description
3.3.1 Condensate discharge drip tray with antifreeze heater (BRCA)
Installed under the finned heat exchanger, this is used to collect the condensate generated during the heating mode operation. It is fitted
with trace heating to prevent ice formation in low ambient conditions. This accessory may only be factory fitted.
3.3.2 Antifreeze kit (RAEV2, RAEV4)
This kit, used on units fitted with a hydraulic kit, comprises a "self-heating" electric cable that is wrapped around the user and domestic hot
water exchanger (P4 Units only), the water circuit pipework. This device is controlled by the microprocessor.
3.3.3 Rubber vibration dampers (KAVG)
To be installed beneath the unit base and the ground to avoid the transmission of vibrations (and the noise) to the building.
3.3.4 RS485 serial interface card modbus protocol (INSE)
This controller card enables the controller to communicate with other devices on a BMS using Modbus protocol.
3.3.6 Electronic expansion valve (VTEE)
The electronic expansion valve enables the maximum possible efficiency to be achieved by maximising the evaporator heat exchange,
minimising the reaction time to load variations and optimising the superheat . It is strongly recommended for use in systems that will experi-
ence large load variations.
3.3.7 Electronic soft starter (DSSE)
All units are supplied, standard with the soft starter device who minimize the peak starting current of the compressor reducing down to the
same value of the nominal maximum input current.
3.3.8 Remote control panel (PCRL)
All units are supplied with microprocessor control panel with high definition display, mounted on board of the unit and it is remotable up to
50 mt. distance.
3.3.9 Hydraulic circuit antifreeze kit (KP)
This kit, used on units fitted with a hydraulic kit, comprises a "self-heating" electric cable that is wrapped around the user and domestic hot
water exchanger (P4 Units only), the water circuit pipework and includes an armoured electric heater that is fitted inside the water tank. This
device is controlled by the microprocessor and it is used in the unit equipped with hydraulic kit.
3.3.10 Hydraulic kit with one pump without tank - user circuit (A1NTU)
It includes: 1 water pump, expansion vessel, pressure relief valve (if required by PED norms).
3.3.12 Cascade control system (SGRS)
Cascade control system for the managment of units. The system is made of a separate plastic box, to be installed in the technical room.
It is connected to the units via RS485.
Rev. A 11-2020
13
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