Step 9 Blow away dirt with nitrogen.
Step 10 Replace the dryer lter.
When replacing the dryer lter, take measures to protect pipes from foreign
matter.
Step 11 Install a new compressor, crankcase heat tape, and dryer lter in the steps of Step
10 to Step 1. Vacuumize the system and partially charge the system with
refrigerant. For details, see section 5.2 Vacuumizing and Charging in Refrigerant.
Install and tighten the corner valve on discharge pipe to a torque of 100 N m with
a torque wrench, and tighten the corner valve on suction pipe to a torque of 120
N m.
Step 12 Connect the compressor cable and check that the phase sequences are correct.
Then choose Maint > Diagnostic Mode > Enter to check the system pressure and
temperature and ensure the refrigerant is charged with an optimal system status
(see 5.5 Commissioning Procedure).
Step 13 On the main screen, choose Maint > Performance Maint, clear up the compressor
running time.
----End
6.5.4 Replacing the High Pressure Switch
Prerequisites
● The high pressure switch needs to be replaced.
● A spare high pressure switch of the same model is available and functional.
● Tools: gloves, Two adjustable wrenchs, thread sealant
Context
The high pressure switch can be maintained only from the rear.
The procedure for replacing a high or low pressure sensor is similar to that for replacing the
high pressure switch.
Procedure
Step 1 On the controller home screen, tap Shutdown, and turn o the smart cooling
product switch in the upstream PDC.
NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm Width) 6 System Operation and Maintenance
Issue 17 (2020-10-22) Copyright © Huawei Technologies Co., Ltd. 210
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