Honeywell SmartVFD HVAC MR4 User Manual page 152

HVAC A
PPLICATION
M3.12.6.1 E
NABLE SETPOINT
M3.12.6.2 S
ETPOINT
The sensor is placed in Position 1. The pressure in the pipe will remain constant when we have
no flow. However, with flow, the pressure will drop farther down in the pipe. This can be com-
pensated by raising the setpoint as the flow increases. In this case, the flow is estimated by the
output frequency and the setpoint is linearly increased with the flow as in the figure below.
Setpoint
Min Freq and Flow
Pressure
Position 1
Figure 22. Enable setpoint 1 for pressure loss compensation
1
1
MAX COMPENSATION
Setpoint + Max compensation
Setpoint
No flow
PT
Max Freq and Flow
Pipe length
PT
100K23.fh11
Position 2
Honeywell
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