Table 4-6 Signal table
No.
X501
X502
X504
X505
1
Smoke
sensor
Water sensor
Outdoor exhaust air
damper 24 V DC
Indoor return air
damper 24 V DC
2
Smoke
sensor
Water sensor
Outdoor exhaust air
damper GND
Indoor return air
damper GND
3
Remote
startup/
shutdown
Fresh air
supply damper
24 V DC
Outdoor exhaust air
damper U (feedback)
Indoor return air
damper U
(feedback)
4
Remote
startup/
shutdown
Fresh air
supply damper
GND
Outdoor exhaust air
damper Y (control)
Indoor return air
damper Y
(control)
5
Common
alarm 1+
Fresh air
supply damper
U (feedback)
Indoor supply air
damper 24 V DC
Fresh air exhaust
damper 24 V DC
6
Common
alarm 1–
Fresh air
supply damper
Y (control)
Indoor supply air
damper GND
Fresh air exhaust
damper GND
7
Common
alarm 2+
Reserved
Indoor supply air
damper U (feedback)
Fresh air exhaust
damper U
(feedback)
8
Common
alarm 2–
Reserved
Indoor supply air
damper Y (control)
Fresh air exhaust
damper Y
(control)
Procedure
Step 1 Connect one end of the water sensor cable to the water sensor.
Step 2 Route the signal cable through the signal cable hole at the bottom of the electric
control box.
Step 3 Connect the signal cable to X502 terminals 1 and 2.
FusionCol8000-E240 Modular Indirect Evaporative
Cooling System
User Manual
4 System Installation (Building Scenario)
Issue 03 (2021-04-20) Copyright © Huawei Digital Power Technologies Co., Ltd.
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