Smoke Control Modes - Carrier WeatherMaker 48A2020 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

BP.MT = 1 (4 motors)
Power Exhaust Stage 0
Power Exhaust Stage 1
Power Exhaust Stage 2
BP.MT = 2 (6 motors)
Power Exhaust Stage 0
Power Exhaust Stage 1
Power Exhaust Stage 2
BP.MT = 1 (4 motors)
Power Exhaust Stage 0
Power Exhaust Stage 1
Power Exhaust Stage 2
Power Exhaust Stage 3
Power Exhaust Stage 4
BP.MT = 2 (6 motors)
Power Exhaust Stage 0
Power Exhaust Stage 1
Power Exhaust Stage 2
Power Exhaust Stage 3
Power Exhaust Stage 4
Power Exhaust Stage 5
Power Exhaust Stage 6

Smoke Control Modes

There are four smoke control modes that can be used to control
smoke within areas serviced by the unit: Pressurization mode,
Evacuation mode, Smoke Purge mode, and Fire Shutdown.
Evacuation, Pressurization and Smoke Purge modes require the
controls expansion module (CEM). The Fire Shutdown input is
located on the main base board (MBB) on terminals TB5-10
and 11. The unit may also be equipped with a factory-installed
return air smoke detector that is wired to TB5-10 and 11 and
will shut the unit down if a smoke condition is determined.
Field-monitoring wiring can be connected to terminal TB5-8
and 9 to monitor the smoke detector. Inputs on the CEM board
can be used to put the unit in the Pressurization, Evacuation,
and Smoke Purge modes. These switches or inputs are connect-
ed to TB6 as shown below. Refer to Major System Compo-
nents section on page 110 for wiring diagrams.
Pressurization — TB5-12 and 13
Evacuation — TB5-12 and 14
Smoke Purge — TB5-12 and 15
Each mode must be energized individually on discrete inputs
and the corresponding alarm is initiated when a mode is acti-
vated. The fire system provides a normally closed dry contact
closure. Multiple smoke control inputs, sensed by the control
will force the unit into a Fire Shutdown mode.
FIRE-SMOKE INPUTS
These discrete inputs can be found on the local display under

Inputs FIRE.
ITEM EXPANSION
FIRE FIRE-SMOKE INPUTS
FSD Fire Shutdown Input
PRES Pressurization Input
EVAC Evacuation Input
PURG Smoke Purge Input
Fire Shutdown Mode
This mode will cause an immediate and complete shutdown of
the unit.
Table 66 — Power Exhaust Staging (BP.CF = 1)
Table 67 — Power Exhaust Staging (BP.CF = 2)
CCN WRITE
RANGE
POINT STATUS
ALRM/NORM FSD forcible
ALRM/NORM PRES forcible
ALRM/NORM EVAC forcible
ALRM/NORM PURG forcible
PE.A PE.B
OFF OFF
OFF ON
ON ON
PE.A PE.B
OFF OFF
OFF OFF
ON ON
PE.A PE.B
OFF OFF
ON OFF
OFF ON
ON ON
ON ON
PE.A PE.B
OFF OFF
ON OFF
OFF ON
ON ON
ON OFF
OFF ON
ON ON
Pressurization Mode
This mode attempts to raise the pressure of a space to prevent
smoke infiltration from an adjacent space. Opening the econo-
mizer (thereby closing the return air damper), shutting down
power exhaust and turning the indoor fan on will increase pres-
sure in the space.
Evacuation Mode
This mode attempts to lower the pressure of the space to pre-
vent infiltrating an adjacent space with its smoke. Closing the
economizer (thereby opening the return-air damper), turning
on the power exhaust and shutting down the indoor fan de-
crease pressure in the space.
Smoke Purge Mode
This mode attempts to draw out smoke from the space after the
emergency condition. Opening the economizer (thereby clos-
ing the return-air damper), turning on both the power exhaust
and indoor fan will evacuate smoke and bring in fresh air.
AIRFLOW CONTROL DURING THE
MODES
All non-smoke related control outputs will get shut down in the
fire-smoke modes. Those related to airflow will be controlled
as explained below. The following matrix specifies all actions
the control will undertake when each mode occurs (outputs are
forced internally with CCN priority number 1 - "Fire").
DEVICE PRESSURIZATION PURGE EVACUATION
Economizer 100%
Indoor Fan — VFD ON/FSO*
Power Exhaust OFF
Heat Interlock
ON
Relay
*"FSO" refers to the supply VFD fire speed override configurable speed.
RELEVANT ITEMS
The economizer's commanded output can be found in Outputs
 
ECON ECN.C.
68
PE.C
OFF
OFF
ON
PE.C
OFF
ON
ON
PE.C
OFF
OFF
OFF
OFF
ON
PE.C
OFF
OFF
OFF
OFF
ON
ON
ON
FIRE-SMOKE
FIRE
SHUTDOWN
100% 0% 0%
ON/FSO* OFF OFF
ON/FSO* ON/FSO* OFF
ON OFF OFF