Section Ii: Installation And Maintenance; Description Of The Unit; Structural Features; Available Installations - Hitecsa EWMIG 236 Manuel D'installation, D'utilisation Et D'entretien

II SECTION II: INSTALLATION AND
MAINTENANCE
II.1

DESCRIPTION OF THE UNIT

II.1.1

STRUCTURAL FEATURES

o Load-bearing structure and panels in galvanised and RAL 9018
painted sheet metal; galvanised steel sheet metal base.
o Hermetic rotary Scroll compressors. The first compressor with
inverter drive, the second one coupled in tandem at a fixed speed for
control of the variable capacity from 27% to 103% of the nominal power,
with reduction of the inrush current during start-up and power factor
correction of the automatic utility towards the mains. They are complete
with external thermal protection and crankcase heater activated
automatically when the unit stops (as long as the electrical supply to the
unit is preserved).
o Adequately insulated, braze-welded plate water side heat exchange
in stainless steel complete with anti-freeze heater.
o Air side exchanger composed of coil with copper pipes and
aluminium fins. Complete with protection grille.
o Electric helical fans with external rotor, supplied with internal circuit
breaker protection and complete with protection mesh.
o Proportional electronic device for pressure regulation and continuous
regulation of the rotation speed of the fans.
o Male threaded hydraulic connections.
o Water heat exchanger differential pressure switch that protects the
unit from any water flow interruptions.
o Outdoor air temperature probe.
o Cooling circuit made with an annealed copper pipe (EN 12735- 1-2)
complete with: dryer filter, load connections, high pressure side
pressure switch, pressure transducer on both the high and low pres-
sure sides, electronic thermostatic expansion valve, cycle inversion
valve, liquid receiver, gas separator and check valve.
o Unit with IP24 protection rating.
o Control with AdaptiveFunction Plus operation.
o The unit is complete with a charge of R410A refrigerant.
II.1.2

AVAILABLE INSTALLATIONS

Standard:
Installation without pump and without water buffer tank
Pump (main circuit):
P1 – Installation with pump.
P2 – Installation with increased static pressure pump.
DP1 – Installation with double pump, including an automatically
activated pump in stand-by.
DP2 – Installation with increased static pressure double pump,
including an automatically activated pump in stand-by.
PI1 - Set up with pump featuring constant speed control (variable
system flow rate).
PI2 – Set up with pump featuring increased head pressure and constant
speed control (variable system flow rate).
DPI1 – Set up with double pump, of which one in standby with
automatic operation and constant speed control (variable system flow
rate).
DPI2 – Installation with increased static pressure double pump,
including an automatically activated pump in stand-by with continuous
speed adjustment (variable capacity of the system).
Tank & Pump (main circuit):
ASP1 – Installation with pump and water buffer tank.
ASP2 – Installation with increased static pressure pump and water
buffer tank.
ASDP1 – Installation with double pump, including an automatically
activated pump in stand-by and storage.
ASDP2 – Installation with increased static pressure double pump,
including an automatically activated pump in stand-by and storage.
ASPI1 – Set up with pump and tank featuring constant speed control
(variable system flow rate).
ASPI2 – Set up with pump and tank featuring increased pressure
head and constant speed control (variable system flow rate).

SECTION II: INSTALLATION AND MAINTENANCE

II.2

ELECTRICAL CONTROL BOARD

○ The electrical panel can be accessed by opening the front panel, in
compliance with IEC Standards in force; it can be opened and closed
using specific tools. It features a thermostat-controlled cooling fan.
○ Complete with:
•
electrical wiring for 400V-3ph+N-50Hz power supply voltage;
•
auxiliary circuit power supply 230V-1ph+N-50Hz derived from main
power supply;
•
general main power supply switch with interlocking safety door
isolator;
•
inverter compressor protection fuses
•
circuit breaker to protect the fixed speed compressor;
•
protection fuse for the auxiliary circuit;
•
Remote unit controls: remote on/off (SCR), remote summer/winter
(SEI), CGA auxiliary generator control (boiler), KRIT integrative
generator control, unit forced drain (FDL), lock lamp (LBG) and
compressor operation lamps (LFC);
•
remote machine commands and controls.
○ Programmable electronic board with microprocessor, controlled by
keyboard inserted in the machine or by using the remote keyboard
(KTR) controlled up to 50 metres: Use the KR200 kit for distances
greater than 50 m up to 200 m.
○ This electronic board performs the following functions:
•
regulation and control of the unit outlet water temperature settings;
of the cycle inversion; of the safety timers; of the circulation pump; of
the system compressor and pump hour-run meter; of the electronic anti-
freeze protection which cuts in automatically when the machine is
switched off; and of the functions which control the operations of the
individual parts making up the machine;
•
complete protection of the unit, possible shutdown and display of all
the triggered alarms; total compressor and inverter protection by means
of continuously monitoring the current absorbed by the compressor and
operating pressures. The compressor can modulate automatically,
regardless of the request if it goes out of its proper field of operation.
•
multi-language display management (Italian, English, French,
German, Spanish);
•
electronic expansion valve management (EEV);
•
management of compressor discharge temperature and inlet and
flow pressures;
•
display the programmed set-points via the display; the in/out water
temperature via the display; the alarms via the display; the chiller or
heat pump operation via Led;
•
self-diagnosis with continual checking of the machine oeprational
status;
•
user interface menu;
•
alarm code and description;
•
alarm history management (menu protected by factory password).
○ In particular, for every alarm, the following are memorised:
•
date and time of intervention;
•
alarm code and description;
•
in/out water temperature values as soon as the alarm was
triggered;
•
alarm delay time from the switch-on of the connected device;
• compressor status at the time of the alarm;
○ Advanced functions:
•
set-up for serial connection (KRS485, KFTT10, KBE, KBM, KUSB
accessory);
•
possibility of having a digital input for remote management of the
double set-point;
•
possibility of having a discrete input for total recovery management
(RC100), the desuperheater (DS) or for the production of domestic hot
water by means of a 3-way diverter valve (VDEV). In this case, there is
the possibility of using a temperature probe instead of the discrete input
(see specific section for more information);
•
possibility to have an analogue input for the shifting set-point via a
4-20mA remote signal;
•
configured to manage time slots and work parameters with the
possibility of daily/weekly operation planning;
•
check-up and verification of the scheduled maintenance status;
•
computer-assisted unit testing;
•
self-diagnosis with continual checking of the machine oeprational
status.
○ Set-point regulation via the AdaptiveFunction Plus with two options:
•
fixed set-point (Precision option);
•
set-point slidinge (Economy options).
Compressor drive control serial connection to the programmable
electronic board.
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