Stairwell Pressurisation Fan Guide

HVAC drives such as the ACH580 are commonly used as stairwell pressurisation fans in the event of an emergency. This Tech Tip will show you the basic parameter set up for a simple application. 

The purpose of a stairwell pressurisation fan is to keep smoke out of exit routes my maintaining positive pressure. Below is a depiction of the setup.

In this example, a 0-10V pressure transducer is input into AI2, and a switch into DI6 to enter override mode. Relay 2 has been set up as a ‘Running’ relay, and relay 3 configured as a fault relay. When the drive enters fire mode, it uses PID Set 1 as its reference, and will maintain a constant setpoint of the user’s choosing.

Navigate to the complete list of parameters by pressing Menu > Parameters > Complete List.

GROUP 10 (Standard DI, RO)

10.27:
RO2 source
Supervision 1

10.30:
RO3 source
Fault

GROUP 12 (Standard AI)

12.25:
AI2 Unit Selection
V

12.27:
AI2 min
0.000

12.28:
AI2 max
10.000

12.29:
AI2 Scaled at AI2 Min
0.000

12.30:
AI2 Scaled at AI2 Max
Pressure Transducer Max

GROUP 20 (Start / Stop / Direction)

20.41:
Start interlock 1
Not Used

GROUP 32 (Supervision)

32.05:
Supervision 1 Function
High

32.06:
Supervision 1 Action
No Action

32.07:
Supervision 1 Signal
Current

32.09:
Supervision 1 Low
0.5A

32.10:
Supervision 1 High
0.5A

32.07:
Supervision 1 Signal
Current

GROUP 40 (Process PID Set 1)

40.07:
Process PID Operation Mode
On

40.08:
Set 1 Feedback 1 Source
AI2 Scaled

40.16:
Set 1 Setpoint 1 Source
Internal Setpoint

40.19:
Set 1 Internal Setpoint Sel1
Selected

40.21:
Set 1 Internal Setpoint 1
TBD by Commissioner

40.32:
Set 1 Gain
TBD by Commissioner

40.33:
Set 1 Integration Time
TBD by Commissioner

40.34:
Set 1 Derivation Time
TBD by Commissioner

GROUP 70 (Override)

70.02:
Override
On

70.03:
Override activation source
DI6

70.04:
Override reference source
Process PID Set 1

70.05:
Override direction
Forward                   


The information displayed on the home screen of the keypad can be changed to show any parameter. From the home screen, press the Options key and then press the Edit Home View option. Next, select the line you want to change, press Edit, then edit the parameter. Pick the parameter you wish to display from the complete list and press Save. This can be used to display parameters such as the PID setpoint.

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