advertisement
VENTILATION SETTINGS
C
OOLING OPERATION
The ST 5121 controls one stage of variable-speed fans (Stage 1), one stage of constant-speed fans (Stages 2) and two optional stages of constantspeed fans (Stages 3 & 4).
Ventilation
Level
1.5 o
F
STAGE 4
STAGE 3
STAGE 2
STAGE 1
1.5 o
F
1.5 o F
Minimum
Ventilation
Cycle
Bandwidth
Stage 1
Temperature
Set Point
Start Temp
Stage 2
Start Temp
Stage 3
Start Temp
Stage 4
Room
Temp.
If room temperature rises:
•
When room temperature < Set Point, the stage 1 fans run at minimum speed according to the minimum ventilation cycle.
•
At Set Point: the stage 1 fans stop operating according to the minimum ventilation cycle and increase in speed as the room temperature rises.
•
At Set Point + Bandwidth 1: the stage 1 fans reach full speed.
•
At Stage 2 Starting Temp: the stage 2 fans start running.
•
At Stage 3 Starting Temp: the stage 3 fans start running.
•
At Stage 4 Starting Temp: the stage 4 fans start running.
QM 1333.rev.00
23
ST 5121
If the room temperature falls:
•
At Stage 4 Starting Temp - 1.5
o
F: the stage 4 fans return to a stop.
•
At Stage 3 Starting Temp - 1.5
o
F: the stage 3 fans return to a stop.
•
At Stage 2 Starting Temp - 1.5
o
F: the stage 2 fans return to a stop.
•
At Set Point + Bandwidth 1: Stage 1 fans start decreasing in speed as the temperature decreases.
•
At Set Point: the Stage 1 fans reach minimum speed.
•
Below the Set Point: the stage 1 fans stop operating continuously and operate according to the minimum ventilation cycle at minimum speed.
24
QM 1333.rev.00
advertisement
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Key Features
- Precise temperature control within 0.1° increments
- Up to 4 temperature probe inputs for accurate readings
- 5 motor curves for compatibility with various motor types
- Full-speed fan start-up for overcoming inertia and de-icing
- Temperature and ventilation curves for automated adjustments
- High/low temperature alarm output for proactive alerts
- Computer connectivity for centralized management
- Air inlet movement coordination with SB 2000 controller
- Overload and overvoltage protection for circuit safety
- Optional mist cooling stage for humidity control
