SECTION II : INSTALLATION AND MAINTENANCE
29
II.8.1 CONFIGURATION
Pressure switch
Intervention
Reset
high pressure
40,2 Bar
28,1 Bar - Manual
low pressure
2 Bar
3,3 Bar – Automatic
water differential
80 mbar
105 mbar - Automatic
Configuration parameters Standard settings
Summer working temperature setting
7°C
Winter working temperature set point (THCEY)
45°C
Work temperature differential
2°C
Antifreeze temperature setting
2,5°C
Antifreeze temperature differential
2°C
Maximum defrost time
10'
Press. exclusion time of low pressure at start-up
120"
Press. exclusion time water differential upon start-up
15"
Delay time for pump shutdown
15"
Minimum time between 2 consecutive compressor start-ups
360"
Pre-ventilation time
30"
The units are tested in the factory, where they are also calibrated and
the default parameter settings are put in. These guarantee that the
appliances run correctly in rated working conditions. The machine
configuration is carried out in the factory and should never be altered.
II.8.2 UNIT
START-UP
Before starting the unit, perform the following checks.
○ The electrical supply must comply with the specifications on the data
plate and/or the wiring diagram and it must fall within the following
limits:
variation of the power supply frequency. ±2 Hz;
variation of the power supply voltage: ±10% of the nominal voltage;
imbalance between the supply phases: <2%.
○ the electrical supply system must be able to supply adequate current
and be suitably sized to handle the load;
○ open the electric panel and make sure the terminals of the power
supply and of the contactors are tight (they may have come loose
during transport, which could lead to malfunctions);
○ check that flow and return pipes of the hydraulic system are
connected in accordance with the arrows next to the machine water
inlet/outlet;
○ make sure that the air side heat exchanger is well ventilated and
clean;
Electrical connections must be made in compliance with the local
installation standards in force in the place where the unit is installed,
and with the instructions in the wiring diagram provided with the unit.
The installer is in charge of dimensioning the power cables.
IMPORTANT!
Before connecting the main power cables L1-L2-
L3+N to the terminals of the general isolator, make
sure that they are in the right order.
The machine can be started by pressing the ON/OFF or RESET -
DOWN key on the machine keyboard. Using the MODE-UP key, select
an operating mode (chiller or heat-pump). Any problems the system
encounters will be immediately shown on the display on the control
keyboard. At start-up, the first device to start in the system is the pump,
which has priority over the rest of the system. During this phase, the
minimum water flow differential pressure switch and the low pressure
switch are ignored for a pre-set time, to prevent variations caused by air
bubbles or turbulence in the water circuit or by pressure fluctuations in
the cooling circuit. Once these time-delays are over, final consent is
given to the machine, followed after another safety time-interval by the
compressor.
II.8.3 DECOMMISSIONING
IMPORTANT!
If the unit is not used during the winter period, the
water contained in the system may freeze.
When the machine is out of use for long periods of time, it is necessary
to disconnect it from the mains by opening the master switch.
All the water contained in the circuit must be drained in time. During
installation, consider mixing the water in the circuit with the correct
proportion of ethylene glycol to guarantee protection against freezing
(see
SECTION II
).
II.8.4 RESTART
AFTER
PROLONGED
SHUTDOWN
Before starting up again, make sure that:
the air side heat exchanger is well ventilated and clean.
there is no air in the hydraulic system (bleed it if required);
the water in the exchanger circulates in the requested amount, (in
the T and H versions, the pump use and maintenance manual is
provided).
II.9
NATURE AND FREQUENCY OF THE
SCHEDULED CHECKS
DANGER!
Maintenance operations, even if for inspection
purposes only, must be carried out by skilled
technicians, qualified to work on air conditioning
and refrigeration products.
DANGER!
Always use the mains switch to isolate the unit
from the mains before carrying out any
maintenance work on the unit, even if it is for
inspection purposes only. Make sure that no one
supplies power to the machine accidentally; lock
the master switch in zero position.
In order to guarantee that the unit runs regularly and efficiently, it is
necessary to schedule an overall inspection at regular intervals to
prevent malfunctions which could damage the main machine
components.
Every 6 months
Check the gas charge.
Check that there are no gas leaks
Check the power consumption of the unit
Check the operation of the water differential pressure switch
Air bleed from hydraulic system
Check the contactors on the electric panel.
END OF SEASON with unit switched off
Check that the air side heat exchanger is clean.
Draining the water system
Inspect and, if necessary, tighten the electrical contacts and
terminals.
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