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Idiomas disponibles
Idiomas disponibles
Applications:
•
Standard temperature control
•
Pressure control of ventilation systems
•
Outside temperature compensated pressure control
•
Pressure control for condensers
•
Pressure control for 2-cycle condensers
These applications are already preset. Parameters for further appli-
cations can easily be set individually.
Sensors:
•
Temperature sensor KTY 10-6 (R25=2kΩ
•
Temperature sensor NTC 103AT (R25=10kΩ
•
Pressure sensor 0...100 / 200 / 500 / 1000 Pa (0-10 V output)
•
Pressure sensor 0...30 bar (4-20 mA output)
•
Parameters for further sensors can easily be set individually.
6 - Start up, controls and
calibration
6.1 - Preliminary operations
For all units:
1.
Check that supply voltage corresponds to that displayed on
the external label and that the connections to the mains supply
are perfectly executed.
2.
Check that control cable is correctly connected (checking the
terminals fixing on the terminal block).
3.
When the automatic switching between summer and winter
set-point is necessary (for Dry Coolers with electric board en-
abled for controlling the double set-point), make sure the cable
leading the signal for the set-point switching (from the remote
air conditioner) is suitably connected (checking the references
on the terminal board).
4.
Check the protection devices mounted before the unit (re-
sponsibility of customer).
6.2 - Start up
The units can be started up during installation to check the correct
operation of the fan. However, for a working check it is necessary
to run the Dry Cooler under normal conditions while connected to
the relevant room unit.
6.3 - Check of electrical circuit
Check the correct electric absorption of the machine, comparing it
with the value on the unit rating data. Check the correct calibration
of the fan speed regulator during the operation.
6.4 - Check of hydraulic circuit
Check the hydraulic circuit is not subject to operating pressure over
16 bar. Make sure there is no air in the Dry Cooler, in case bleed all
the air through the suitable bleeding screw.
6.5 - Operation at low temperatures
When the circuit is filled with water-glycol mixture, run the circula-
tion pump for at least thirty minutes after adding any glycol to the
circuit in order to avoid the glycol stratification. If the Dry Cooler
operates at temperatures below 0 C it is necessary to mix the water
in the circuit with antifreeze glycol (see Tab. a).
The fan speed regulator R, if installed, must remain always ON
if the outdoor temperature is lower than 0C to prevent conden-
sate from forming on the inner electronic circuits.
English
If no winter operation are required, the Dry Cooler should be dis-
charged completely of its water content.
NOTE
To discharge the water from the Dry Cooler use the suitable screws
in the sleeves of the outlet and inlet manifolds.
When the Dry Cooler is positioned with horizontal air flow, it is al-
ways advisable to complete the operation blowing compressed air
in the sleeve in the upper position to ensure a complete draining,
namely:
1.
Loosen the screw of the sleeve of the outlet manifold (the low-
er one) and discharge.
2.
Loosen the screw of the inlet sleeve (the upper one) and blow
compressed air totally draining the water from the sleeve of
the outlet manifold.
Tab. a - Freezing point of water and ethylene glycol mixture
% in weight
Freezing point °C
ATTENTION:
If the chilled water is mixed with antifreeze then it is absolutely
necessary to, as soon as the hydraulic circuit charging has been
finished, disconnect the supply water coming from the sanitary
circuit: this avoids the danger of liquid antifreeze entering into the
user's hydraulic supply. and also changing the glycol percentage.
The connection should thereafter only be reinstated for the period
necessary to recharge the water in the circuit. At this point it would
also be opportune to check the concentration of liquid antifreeze
and top up the circuit in order to maintain constant the freezing
temperature of the mixture.
6.6 - Operating limits
It is recommended to follow the operating limit conditions shown in
the following Table b:
Tab. b - Operating limits
Max outdoor air tempera-
ture (*)
Minimum outdoor air tem-
perature (*)
Max outdoor air tempera-
ture (*)
Minimum outdoor air tem-
perature (*)
Power supply tolerancess
Max Dry Cooler inlet wa-
ter temperature
(*) Outdoor air temperature means the air temperature at the Dry
Cooler intake.
For other operating conditions contact the manufacturer.
The product is not suitable for applications in explosive, flam-
mable or in any way aggressive atmosphere.
Dry Coolers
0
10
20
30
0
-4
-9
-15
+ 46
C
0
With fan speed regula-
tor installed on the Dry
Cooler.
- 20
C
0
+ 51
C
0
Without fan speed regu-
lator installed on the Dry
Cooler.
- 30
C
0
Standard voltage +/- 10%
Standard frequency +/- 2Hz
+ 60
C
0
40
50
-24
-37
7
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