@DNOVA THS_R410A-IOM-1304-E
17
7
Operating Parameters Setting
7.1
Generalities
All the control devices are set and tested in the factory before the unit is dispatched. However, after the unit has been in
service for a reasonable period of time you can perform a check on the operating and safety devices.
The settings are shown in Tab. 4 and Tab. 5.
All servicing of the equipment is to be considered extraordinary maintenance and may be carried out
BY QUALIFIED TECHNICIANS ONLY: incorrect settings may cause serious damage to the
unit and injuries to persons.
The operating parameters and control system settings configurable by means of the microprocessor control are
password protected if they have a potential impact on the integrity of the unit.
Tab. 4
Setting of control devices
Control device
Set point
Differential
Differential air pressure switch (outlet air flow)
Pa
50
30
Differential air pressure switch (dirty filter)
Pa
50
20
Values to be calibrated depending on the application.
Tab. 5
Setting of safety-control devices
Control device
Activation
Differential
Resetting
Maximum pressure switch
Bar
42.0
4.0
Manual
Minimum pressure switch
Bar
2.0
1.5
Automatic
Modulating condensation control device
Bar
18.0
7.0
-
Time lapse between two compressor starts
s
480
-
-
7.2
Maximum pressure switch
The high pressure switch stops the compressor when the outlet pressure exceeds the set value.
Warning: Do not attempt to change the setting of the maximum pressure switch: Should the
latter fail to trip in the event of a pressure increase, the pressure relief valve will open.
The high pressure switch must be
manually
reset; this is possible only when the pressure falls below the set differential
(see Tab. 5).
7.3
Minimum pressure switch
The low pressure switch stops the compressor when the inlet pressure falls below the set value for more than 120
seconds. The switch is automatically reset when the pressure rises above the set differential (see Tab. 5).
