Section Ii: Installation And Maintenance; Description Of The Unit; Structural Features; Set-Ups Available - Hitecsa EWNLM 115 Manuel D'utilisation

II SECTION II: INSTALLATION AND
MAINTENANCE
II.1

DESCRIPTION OF THE UNIT

II.1.1

STRUCTURAL FEATURES

○
Structure in galvanised and RAL 9018 painted steel plate, coated
on the inside with sound-absorbing panelling.
○
Scroll-type hermetic rotary compressors complete with internal
thermal protection and guard resistances activated automatically when
the unit stops (as long as the unit remains powered electrically).
○
Plate type heat-exchangers in stainless steel with closed-cell
expanded polyurethane foam insulation complete with anti-freeze
elements.
○
Differential pressure switch on the primary heat exchanger for
EWNLM models, on the primary heat exchanger and on the rejection
device for the EWNHM models to protect the unit from any
interruptions
of the water flow.
○
Male threaded hydraulic connections.
○
Refrigerant circuit realised with pipes welded using valuable alloys.
Complete with: reversing valve (EWNHM), filter drier, thermostatic valve
(n° 2 for EWNHM models), non-return valves (EWNHM), load
connections, safety pressure switch on the high pressure side with
manual rearm, pressure switch on the low pressure side with automatic
rearm, from model 122 to 240 valve/and safety, liquid indicator and
isolation of the intake line.
○
Rejection device circuit realised with pipes welded using valuable
alloys. Complete with: manual air vent and drain valve.
○
Primary circuit realised with pipes welded using valuable alloys.
Complete with: manual air vent and drain valves.
○
Unit with IP21 protection rating.
○ The unit is complete with the R410A refrigerant charge.
II.1.2

SET-UPS AVAILABLE

Standard:
Set-up without pump and without hydraulic accessories.
Pump:
P1 – Set-up with pump.
P2 – Set-up with pump with increased static pressure.
PS1 – Set-up with pump regulated with source side phase cut (to use
with geothermal probes on EWNLM and EWNHM and Dry Cooler on
EWNLM) to control the condensation temperature in the summer
functioning mode.
The set-ups P1 and P2 also envision in the primary circuit: expansion
tank, safety valve (3 Barg), water gauge, filling valve, drain valve and
manual bleed valves. The PS1 set-up is complete with drain valves and
manual bleed valves.
II.1.3

PUMP VERSIONS

The EWNLMP and EWNHMP include an integrated circulating pump
in the primary side inside the machine.
II.1.4 FEATURES OF THE ELECTRIC CONTROL
BOARD
○
Electric control board accessible by opening the front panel,
conforming to current IEC norms, can be opened and closed with a
suitable tool.
○
Complete with:
electric wiring set-up for the power supply voltage (400V-3ph+N-
50Hz);
auxiliary power supply 230V-1ph-N-50Hz drawn from the main
power supply;
general isolator, complete with door interlocking isolator;
automatic compressor protection switch;
protection fuse for auxiliary circuit;
compressor power contactor;
Automatic switch for pump protection (three-phase pump only);
Pump power contactor (three-phase pump only);
remote unit control.
○
Programmable circuit board with microprocessor, controlled by the
keyboard inserted in the machine.

SECTION II: INSTALLATION AND MAINTENANCE

○
This circuit board performs the following functions:
Regulation and management of the outlet water temperature set-
points; of cycle reversal (THCEY); of the safety timer delays; of the
circulating pump; of the compressor and system 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, automatic emergency shutdown and
display of the alarms which have been activated;
phases sequence monitor for compressor protection;
unit protection against low or high phase power supply voltage;
visual indication of the programmed set-points via the display; of the
in/out water temperature via the display; of the alarms via the display;
and of cooling/heat-pump operating mode via display;
self-diagnosis with continuous monitoring of the functioning of the
unit;
user interface menu;
alarm code and description;
alarm history management (menu protected by manufacturer
password).
○
The following is memorized for each alarm:
date and time of intervention (if the KSC accessory is present);
alarm code and description;
inlet/outlet water temperatures when the alarm intervened;
alarm delay time from the switch-on of the connected device;
compressor status at moment of alarm;
○
Advanced functions:
3-way valve management for domestic hot water.
configured for serial connection (KRS485, KFTT10, KRS232 and
KUSB accessory);
user interface menu;
alarm code and description;
alarm history management (menu protected by manufacturer
password).
○ The following is memorized for each alarm:
date and time of intervention (if the KSC accessory is present);
alarm code and description;
inlet/outlet water temperatures when the alarm intervened;
alarm delay time from the switch-on of the connected device;
compressor status at moment of alarm;
○ Advanced functions:
configured for serial connection (KRS232 and KUSB accessory);
possibility to have a digital input for remote management of double
set-point (contact HITECSA pre-sales );
possibility to have an analogue input for the scrolling set-point via a 4-
20mA remote signal (contact HITECSA pre-sales );
configured for management of time bands and operation parameters
with the possibility of daily/weekly operating programs (KSC accessory);
check-up and monitoring of scheduled maintenance status;
inspection of the units assisted by computer;
self-diagnosis with continuous monitoring of the functioning of the
unit.
○ Set-point regulation via the Adaptive Function Plus with two
options:
fixed set-point (Precision options);
scrolling set-point (Economy option).
II.2

SPARE PARTS AND ACCESSORIES

IMPORTANT!
Only use original spare parts and accessories.
HITECSA shall not be held liable for damage
caused by tampering or work carried out by
unauthorised personnel or malfunctions caused by
the use of non-original spare parts or accessories.
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