Operating Parameters Setting; Generalities; Maximum Pressure Switch; Minimum Pressure Switch - Lennox Adnova THS Series Installation, Operating And Maintenance Manual

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
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
Differential air pressure switch (outlet air flow)
Differential air pressure switch (dirty filter)
Values to be calibrated depending on the application.
Tab. 5 Setting of safety-control devices

Maximum pressure switch

Minimum pressure switch

Modulating condensation control device
Time lapse between two compressor starts
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).
@DNOVA THS_R410A-IOM-1304-E
BY QUALIFIED TECHNICIANS ONLY: incorrect settings may cause serious damage to the
unit and injuries to persons.
Control device
Control device
Set point
Pa 50
Pa 50
Activation
Bar 42.0
Bar 2.0
Bar 18.0
s 480
Differential
30
20
Differential Resetting
4.0 Manual
1.5 Automatic
7.0 -
- -
17