Constant duct pressure control
A pressure sensor should be added and installed in the duct before this function is activated. This sensor should be connected to
terminal strip Xf19 in the unit. An autozero should be performed when commissioning this sensor. Refer to the unit's manual for the
electrical connection and autozero.
The intake pressure setpoints are adjustable: setpoints 1/2 (P118, P119). The PID for the intake motors control is managed via P120
to P122
In this case the exhaust fan operates based on intake flow rate feedback (default setting) with a multiplier coefficient (P106)
to create a positive pressure or vacuum pressure at the exhaust.
Intake duct pressure
118
Air intake duct pressure setpoint 1
119
Air intake duct pressure setpoint 2
120
Air intake duct pressure control PID proportional band (P)
121
Air intake duct pressure control PID integral time (I)
122
Air intake duct pressure control PID derivative time (D)
124
Intake duct pressure lower limit threshold
125
Intake duct pressure upper limit threshold
Exhaust duct pressure
The exhaust pressure setpoints are adjustable: setpoints 1/2 (P136, P137). The PID for the intake motors control is managed via P138
to P140
136
Exhaust duct pressure setpoint 1
137
Exhaust duct pressure setpoint 2
138
Exhaust duct pressure control PID proportional band (P)
139
Exhaust duct pressure control PID integration time (I)
140
Exhaust duct pressure control PID derivative time (D)
142
Exhaust duct pressure lower limit threshold
143
Exhaust duct pressure upper limit threshold
Faults
The pressure sensors installed on the fans are also used to detect the presence of the air flow (threshold P111). The PLC triggers a
fault if the flow rate is greater or less than the fixed limits.
Flow rate control
110
AHU max flow rate
111
AHU flow rate low limit threshold
Minimum and maximum flow rates depending on the unit model:
Model (P1)
Max. flow rate
(P110)
Min. flow rate
(P111)
39HXC 010 Alu
1200 m
3
/h
300 m
3
/h
39HXC 010 PP
1200 m
3
/h
300 m
3
/h
39HXC 020 Alu
2200 m
3
/h
500 m
3
/h
39HXC 020 PP
2200 m
3
/h
500 m
3
/h
39HXC 030 Alu
3700 m
3
/h
700 m
3
/h
39HXC 040 Alu
5100 m
3
/h
900 m
3
/h
39HXC 060 Alu
6600 m
3
/h
1400 m
3
/h
39HXE 010 Alu
1450 m
3
/h
300 m
3
/h
39HXE 010 PP
1450 m
3
/h
300 m
3
/h
39HXE 020 Alu
2800 m
3
/h
500 m
3
/h
39HXE 020 PP
2800 m
3
/h
500 m
3
/h
Model (P1)
Max. flow rate
(P110)
Min. flow rate
(P111)
39HXE 030 Alu
4500 m
3
/h
700 m
3
/h
39HXE 040 Alu
5700 m
3
/h
900 m
3
/h
39HXE 050 Alu
7000 m
3
/h
900 m
3
/h
39HXE 060 Alu
8500 m
3
/h
1400 m
3
/h
39HXE 075 Alu
11,000 m
3
/h
1400 m
3
/h
39HXE 100 Alu
14,000 m
3
/h
2500 m
3
/h
39HXE 150 Alu
18,000 m
3
/h
3000 m
3
/h
39HXV 007 Alu
1200 m
3
/h
300 m
3
/h
39HXV 007 PP
1200 m
3
/h
300 m
3
/h
39HXV 015 Alu
2000 m
3
/h
700 m
3
/h
39HXV 015 PP
2000 m
3
/h
700 m
3
/h
39HXV 020 Alu
2600 m
3
/h
700 m
3
/h
39HXV 020 PP
2600 m
3
/h
700 m
3
/h
3 - FEATURES
20
Summary of Contents for 39HXC
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