48
Checks and settings after switching on
Refrigerant circuit
For each refrigerant circuit, make sure :
• there are no gas leaks (all the caps of the pressure points must be fitted and secured)
• the saturation temperature (dew point) corresponding to the condensation pressure is approx. 10-15°C higher than the
outside air temperature in cooling and approx. 30-35°C higher than the inlet air temperature in heating
• the saturation temperature (dew point) corresponding to the evaporation pressure is approx. 25-30°C lower than the inlet
air temperature in cooling and approx. 10-15°C lower than the outside air temperature in heating
• overheating is between 5°C and 10°C
• subcooling is between 5°C and 10°C in cooling and between 10°C and 20°C in heating
• the fluid indicator is full and does not show the presence of humidity
• the compressor discharge temperature is 30-40°C higher than the saturation temperature (dew point) corresponding to
the condensation pressure
N.B. The values given are only approximate and valid for units operating with all inlet air and temperatures close to nominal.
Aeraulic circuit
Setting of the air flow in the inlet and outlet ducts must be carried out by a specialised technician equipped with suitable measu-
rement instruments.
STANDARD version
The outlet air flow (coinciding with that of inlet) can be set by operating on the transmission of the internal centrifugal fan. Modify
the opening of the expanding pulley fitted on the electric motor. If the design delivery cannot be obtained in this way, replace the
fixed pulley, fitted on the fan, with one of a different diameter.
Version 1 SHUTTER
The outlet air flow can be set as described for the standard version.
To adjust the inlet air flow, manually adjust the opening of the outside air shutter until obtaining the design value.
Check the outlet air flow again and if necessary repeat the two setting operations until obtaining the required values for both de-
liveries.
Version 2 and 3 SHUTTERS
The outlet air flow can be set as described for the standard version.
To adjust the inlet air flow modify the parameter that defines the minimum opening of the outside air shutter until obtaining the
design value (during this phase make sure free-cooling is disabled by means of the parameter).
Check the outlet air flow again and if necessary repeat the two setting operations until obtaining the required values for both de-
liveries.
NOTE. The outlet air flow must always be higher than or equal to the inlet air flow for obtaining a correct intake of the outside air.
Electrical circuit
Using a tester check that the current absorbed by the compressors and fans is less than the max. permissible values (FLA), indi-
cated in the section “Technical data”.
START UP
To Next Page
Loading...
