● Outdoor unit signal cables can be connected over RS485 (default) or dry
contacts. In RS485 connection mode, the indoor unit can obtain the operating
status and alarm information of the outdoor unit and control the rotational
speed and on/o status of the outdoor unit. In dry contact connection mode,
the indoor unit can only control the
on/o status of the outdoor unit. If dry
contact connection is used, choose Settings > System Settings > Outdoor Fan
and set Outdoor fan control mode to Dry contact.
● If the signal cable connects to a dry contact while Outdoor fan control mode
is set to Communicate, the Outdoor fan communication failure alarm will be
displayed on the LCD.
● If the signal cable connects to an RS485 port while Outdoor fan control mode
is set to Dry contact, the Comp discharge HP alarm will be displayed on the
LCD after the compressor starts.
● If the Outdoor fan control mode is changed on the screen, the monitoring
software will restart.
Procedure
Step 1 Route the cable through the cable protection ring on the top or bottom from the
outside, then through the cable hole on the top or bottom of the electric control
box along the outside of the electric control box.
Step 2 Connect signal cables.
● (RS485 connection) Connect one end of the cable to points 1, 2, and 3 on the
external signal port X302 and the other end to ports 3, 4, and 5 on the
outdoor unit. Figure 3-51 shows the signal cable route.
● (Dry contact connection) Connect one end of the cable to points 1 and 2 on
the external signal port X301 and the other end to ports 1 and 2 on the
outdoor unit. Figure 3-50 shows the signal cable route.
Step 3 Secure the cable using cable ties.
----End
3.11.4.3 Connecting the Water Sensor Cable
Procedure
Step 1 Connect one end of the water sensor cable to a water sensor.
Step 2 Connect the other end of the water sensor cable to points 7 and 8 on the external
signal port X301. Figure 3-50 shows the route of the water sensor signal cable.
Step 3 Secure the water sensor cable to the cabinet using cable ties.
----End
3.11.5 Teamwork Networking and Monitoring
NetCol5000-A025 In-row Air Cooled Smart Cooling
Product
User Manual (300 mm Width) 3 Installation Guide
Issue 15 (2020-12-10) Copyright © Huawei Technologies Co., Ltd. 83
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