Andover Controls Infinity - Controlling the Stairwell Fan; AHU3 (TCX853) Stairwell Fan Control; AHU_Control Program for AHU3

Smoke Control Programs
5-62 Infinity Smoke Control Guide
TOC
Controlling the Stairwell Fan
AHU3 (TCX853)
The TCX853 named AHU3 is responsible for controlling the stairwell
fan. Since the stairwell fan is not used for HVAC, this is a dedicated
controller.
Table 5-5 lists the programs that are used by the TCX853 for this
application.:
AHU_Control
Type:
Program
FlowType:
Looping
AutoStart:
True
Description:
Controls the state of the Stairwell Fan
Code:
Initialize:
DefaultFanPosn = Off
Goto FanControl
FanControl:
‘ Supply Fan Control
If INFINITY1 AH3Sfan.OVR.Off then
Sfan = Off
Else
If INFINITY1 AH3Sfan.OVR.On then
Sfan = On
Else
If INFINITY1 STRWL.PRS then
Sfan = On
Else
If INFINITY1 STRWL.SMK then
Sfan = Off ‘Stop Supply Fan as Zone in Fire
Else
If INFINITY1 Zone1.SMK or INFINITY1 Zone2.SMK or ~
INFINITY1 Zone3.SMK or INFINITY1 Zone4.SMK then
Sfan = On ‘pressurize
Else
Table 5-5. AHU3 Files
NAME TYPE DESCRIPTION
AHU_Control Program Controls the state of the Stairwell Fan
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