Constant Residual ∆P Regulation - Mitsubishi Electric Evolution+ s-MEXT Technical Manual

Constant residual ∆P regulation
11.5.2
The pressure transducer is positioned according to the following figure:
Figure 11-5: chart for positioning the pressure taps for the differential pressure probe.
The controller adjusts following the chart below:
INCREASE speed
During the configuration of the unit the design differential pressure value is entered.
The programme also requires the fan to have a minimum flow rate below which the controller cannot go. This value is also
entered during unit configuration.
The parameters entry mask is under the "Fan" menu accessible through the "Service" password.
INFORMATION:
The minimum fan speed cannot fall below the value of P23.01 - P23.68%.
Version 38
NO Action
P23.67
Differential Differential
P23.69 P23.69
Figure 111-6: fan adjustment graph.
DECREASE speed
Differential pressure
161