Lennox INNOV DM R Series, Application Manual

Page: 52 / 106

INNOV@ ECFAN DHR -AGU-0912-E • 20 •
8 Setting Operating Parameters
8.1 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. 5 e tab. 6.
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. 5 Setting of control devices
Control device Set point Differential
Differential air pressure switch (air flow) Pa 50 30
Differential air pressure switch (dirty filter) Pa 70 20
Values to be calibrated depending on the application.
tab. 6 Setting of control and safety devices
Control device Activation Differential Resetting
Maximum pressure switch Bar-g 38 4 Manual
Minimum pressure switch Bar-g 2.0 1.5 Automatic
Modul. condensation control devices (DX versions) Bar-g 18 10
Time lapse between two compressor starts s 480 - -
8.2 Maximum pressure switch
The high pressure switch stops the compressor when the outlet pressure exceeds the set value.
The high pressure switch must be manually reset; this is possible only when the pressure falls below the
differential set (see table 6).
8.3 Minimum pressure switch
The low pressure switch stops the compressor when the inlet pressure falls below the set value for more than 1
second.
The switch is automatically reset when the pressure rises above the set differential (see table 6).
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.
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.