Decommissioning; Restart After Prolonged Shutdown; Nature And Frequency Of The Scheduled Checks - Hitecsa 117 Manual De Instalación, Uso Y Mantenimiento

Table 1 - Op (Pa) values at the nominal air flow rate of the fan
Size Unit Op (Pa)
117 910
124 910
128 1176
Set the maximum speed value determined according to the
calibration procedure
Table 2 (default values entered in the software according to the
model):
Mask Parameter description
Maximum fan spd. modul. in chiller
Jf09
mode
Maximum fan spd. modul. in HP
Jf09
mode
Jf11 Max fan force speed in chiller mode
Jf13 Max fan force speed in HP mode
IMPORTANT!
If the default values in Table 2 are increased and if
the installation has not been carried out
professionally (the duct must be connected to the
unit by means of special anti-vibration joints, the
pressure drop of the duct, at nominal flow rate,
must not exceed 80Pa, etc.), HITECSA is not
liable for the increase in noise.
IOM_EQUI PF-EQUHI PF_117a128_207983_200101_ES-EN-FR-DE-IT
Access the J.Assistance menu.
In the sub-menu, scroll with the [$]
key to item f.condens. control and
confirm by pressing [ENTER].
Use the [$] key to go to screen Jf09.
If necessary, change the parameters
of Maximum fan spd. modul. in chiller
mode or Maximum fan spd. modul. in
HP mode according to the calibration
procedure just described.
Use the [$] key to go to screen Jf11.
Change the Speed parameter
according to the calibration
procedure just described.
Use the [$] key to go to screen Jf13.
Change the Speed parameter
according to the calibration
procedure just described.
Model
117 124
6.2V 6.2V
6.2V 6.2V
6.2V 6.2V
6.2V 6.2V
The machine can be started by pressing the ON/OFF key on the
keyboard built into the machine. Using the MODE 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.
The compressor follows a start-up procedure with controlled
acceleration ramps. After a few minutes you can note that the
compressor will run at a speed of rotation which is proportional to the
thermal load.
IMPORTANT!
In this phase, it must be considered normal that the
flow temperature drops by a few degrees below the
set value, however remaining higher than the anti-
freeze set in the summer cycle.
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 Protecting the unit from frost).
II.8.4

RESTART AFTER PROLONGED SHUTDOWN

Before starting up again, make sure that:
 there is no air in the hydraulic system (bleed it if required);
 water in the heat exchanger is circulating in the required amount.
 the air side heat exchanger is well ventilated and clean.
II.9 NATURE AND FREQUENCY OF THE
SCHEDULED CHECKS
DANGER!
Maintenance operations, even if for inspection
128
purposes only, must be carried out by skilled
7.1V
technicians, qualified to work on air conditioning
and refrigeration products.
7.1V
DANGER!
Always use the mains switch to isolate the unit
7.1V
from the mains before carrying out any
7.1V
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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