Replacing A Pneumatic Switch - Huawei FusionModule800 Maintenance Manual

FusionModule800 Smart Small Data Center
Maintenance Guide
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Step 2 Disconnect the power supplies from the air conditioner control unit and the outdoor unit after
the air conditioner shuts down over the EMS.
Step 3 Open the top cover and left front panel using a Phillips screwdriver.
Step 4 Cut the cable ties on the oil heating belt cable using diagonal pliers and take out the oil
heating belt cable from the electric control box.
Step 5 Open and take out the cable tie of the oil heating belt.
oil heating belt.
Step 6 Install the new oil heating belt and secure it using a cable tie.
Step 7 Reinstall the oil heating belt cable in the electric control box and secure it using a cable tie.
Step 8 Reinstall the left front panel and top cover.
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5.3.2.6 Replacing a Pneumatic Switch

Prerequisites
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Context
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Procedure
Step 1 Shut down the air conditioner over the EMS.
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Issue 02 (2016-11-15)
a. Choose Home.
b. Tap the cabinet that houses the air conditioner in the micro-module view.
c. Tap the air conditioner to be set in the cabinet layout diagram.
d. Choose Real-time Data > OFF.
Method 2: Log in to the ECC800 WebUI as admin. Choose Monitoring > Air
Conditioner > NetCol5000-A0104 > Controls > Ctrl Info, set On/off status on
EMS > Off, and then click Submit.
0104 in NetCol5000-A0104 is variable and subject to changes with the air conditioner connection
sequence. The displayed value prevails.
The pneumatic switch needs to be replaced.
A spare pneumatic switch of the same model is available and functional.
This section describes how to replace a high pressure switch or low pressure switch at
the outdoor side. Perform replacing operations after you have checked whether the high
pressure switch or low pressure switch is damaged.
Tools: Phillips screwdriver, welding torch (acetylene+oxygen), flat-head screwdriver,
socket wrench, diagonal pliers, refrigerant retrieval device (required based on local
conditions), nitrogen injection and pressure preservation tool, vacuumization tool, and
refrigerant injection tool.
Preparation: Power off the outdoor unit and retrieve the refrigerant in the system.
Method 1: Log in to the ECC800 mobile phone or pad app as admin.
a. Choose Home.
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5 Parts Replacement
Figure 5-39 shows the position of the
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