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II. S
II - I
ECTION
II.1 Structural features
• Load-bearing structure and panelling in galvanised and RAL 9018 painted
sheet steel; base in galvanised sheet steel.
• The structure consists of two sections:
o technical compartment that houses the compressors, the electrical
panel and the main components of the cooling circuit;
o aeraulic circuit dedicated to housing the heat exchanger coils and
electric fans.
• Hermetic scroll type rotary compressors. The first compressor is invert-
er-operated, the second at fixed speed to control the variable capacity
with reduction of the starting current in start-up phase and partial power
factor correction of the utility towards the mains. They include thermal
protection and casing heater activated automatically when the unit stops
(as long as still electrically powered).
• Main and secondary water side braze-welded plate heat exchanger made
of insulated stainless steel, complete with antifreeze heater.
• Air side heat exchanger consisting of a coil with mechanically expanded
copper pipes in aluminium fins with a corrugated geometry to increase
the heat exchanging efficiency.
• Electric helical fans with external rotor, fitted with internal thermal protec-
tion and complete with double-row protection mesh.
• Electronic device for pressure regulation and continuous regulation of
the rotation speed of the fans.
o In the T-High efficiency and Q-Super-silenced versions, sizes 270-2100,
the electronic device (FI15) is supplied as per standard - Fans with EC
motor.
o In the T-High efficiency and Q-Super-silenced versions, sizes 2115÷2130,
the electronic device (FI10) is supplied as per standard - Fans with phase
cutting.
• Victaulic-type hydraulic connections.
• Differential pressure switch that protect the unit from any water flow in-
terruptions.
• Cooling circuit made with annealed copper pipe (EN 12735-1-2) com-
plete with:
o dryer filter, load connections, high pressure side manual reset safety
pressure switch, LP and HP pressure transducer, safety valve(s), valve
upstream of the filter, liquid indicator, intake line isolation, electronic ex-
pansion valve; cycle reverse valve, liquid receiver, check valve and inlet gas
separator to compressors.
• Displayed high and low pressure of the cooling circuits
• Unit with IP24 protection rating.
• Control with Adaptive Function Plus primary circuit regulation.
• The unit is complete with a charge of R410A refrigerant.
40
NSTALLATION AND MAINTENANCE
EQPI3X
II.3 Electrical control board
• Electrical panel can be accessed by opening the front panel, in compli-
ance with IEC Standards in force, fitted with opening and closing via spe-
cific tool.
• Complete with:
o electrical wiring arranged for power supply 400-3ph+N-50Hz;
o auxiliary circuit power supply 230V-1ph-50Hz derived from main power
supply;
o main power supply switch with interlocking safety door isolator;
o automatic thermal overload switch to protect the compressors and the
motor-driven fans;
o auxiliary circuit protection fuse;
o compressors power contactore (only for fixed speed compressor);
o remote machine controls: ON/OFF and summer/winter selector;
o remote machine controls: compressor operating light and general lock
light.
• Programmable microprocessor electronic board handled by the key-
board inserted in the machine.
• This electronic board performs the following functions:
o adjusting and controlling the temperature settings of the water entering
the main heat exchanger and the recovery heat exchanger, of the cycle
inversion; safety delays; of the main heat exchanger circulation pumps and
the recovery heat exchanger circulation pumps; of the work counter of
the compressor and of the system and recovery pumps; of the defrosting
cycles; of the electronic antifreeze protection that is automatically activat-
ed when the machine is off; of the functions that control the intervention
mode of the individual parts forming the machine;
o complete protection of the unit, possible shutdown and display of all
the triggered alarms;
o the following are displayed on the main screen: water inlet/outlet
temperature of the active heat exchanger at that time (main or recovery
heat exchanger), unit operating status (on, off, off due to an alarm, off due
to a time band, off via remote control), operating mode (cooling, heating,
recovery or cooling + recovery), start-up/shutdown mode and active work
set-point;
o displayed operating status of each circuit on specific screens. In detail:
pressures (high and low), temperature (evaporation), overheating, electron-
ic expansion valve opening step and compressor operating state (on, off,
alarm or the minimum on/off times are displayed);
o user interface menu with LCD display;
o automatic pump operating time balance (DP1-DP2, ASDP1- ASDP2,
DPR1-DPR2 installations);
o automatic activation of the pump in standby in the event of an alarm
(DP1-DP2, ASDP1-ASDP2, DPR1-DPR2 installations);
o alarm code and description.
• Management of alarms log; In particular, each alarm memorises:
ɱ date and time of intervention;
o in/out water temperature values as soon as the alarm was triggered;
o the evaporation and condensation pressure values at the time of the alarm;
ɱ alarm delay time from the switch-on of the connected device;
o compressor status at the time of the alarm;
• Advanced functions:
• Pump Energy-Saving management;
• evaporator pump control KPE, contactor recovery pump command KPR
and KPDS desuperheater Pump Control in the case of external supply of
electric pumps (to be installed by the installer). For the unit to operate prop-
erly, activation of the recovery pump, by the installer, must be controlled
by means of a specific discrete output provided in the board on the unit;
• Hi-Pressure Prevent function with forced cooling capacity partialisation
for a high outdoor temperature (in summer mode);
• set-up for serial connection (SS, FTT10, KBE, KBM, KUSB accessory);
• possibility to have a digital input for remote management of double set
point (DSP);
• possibility to have an analogue input for the shifting Set-point (CS) via a
4-20mA remote signal;
• management of time bands and operation parameters with the possibil-
ity of daily/weekly functioning programs;
• check-up and monitoring of scheduled maintenance status;
• computer-assisted unit testing;
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