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Liebert PW017 User Manual

Liebert PW017
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7. Install replacement compressor and make all connections. Replace gaskets or seals on service
valves. Replace unloading solenoid.
8. Evacuate, charge and operate per the appropriate procedure per local codes:
Evacuation, Leak-testing, and Charging Air-cooledSystems withTXV
andwithoutReceivers on page39
Evacuation, Leak-testing, and Charging Air-cooled Systems withLiebertLee-Temp™
“Flooded-condenser Head-pressureControlSystem on page43.
Evacuation and Leak-testing Air-cooled Systems withUnheated Receivers on page45
Water/Glycol-cooled units should be charged with refrigerant amount as shown on the
serial tag, using standard industry charging procedures for self-contained R-410A units.
NOTICE
Risk of improper component re-installation. Can cause equipment damage.
Identify and mark location of suction pressure transducer and discharge pressure switch.
These devices look similar and they must be reinstalled in their original location.
9.11 Facility Fluid and Piping Maintenance forWaterandGlycolSystems
Maintaining facility water and glycol quality is required throughout the life of the coolant fluid piping
system. Fluid and piping system maintenance schedules must be established and performed. A coolant-
fluid maintenance program must be established that will evaluate fluid chemistry and apply necessary
treatment. The complexity of water/glycol solution condition problems and the variations of required
treatment programs make it extremely important to obtain the advice of a competent and experienced
water-treatment specialist and follow a regularly-scheduled coolant-fluid system-maintenance program.
Perform periodic inspections of the facility and the unit coil and/or heat exchanger and coolant-fluid
piping system for leaks and visible damage.
9.12 Glycol Solution Maintenance
It is difficult to establish a specific schedule of inhibitor maintenance because the rate of inhibitor
depletion depends upon local water conditions. Analysis of water samples at the time of installation and
through a maintenance program should help to establish a pattern of depletion. A visual inspection of the
solution and filter residue is often helpful in judging whether active corrosion is occurring.
The complexity of water/glycol solution condition problems and the variations of required treatment
programs make it extremely important to obtain the advice of a competent and experienced water-
treatment specialist and follow a regularly-scheduled coolant-fluid system-maintenance program. It is
important to note that improper use of water treatment chemicals can cause problems more serious than
using none. Proper inhibitor maintenance must be performed in order to prevent corrosion of the glycol
system. Consult the glycol manufacturer for testing and maintenance of inhibitors. Do not mix products
from different manufacturers.
9.13 Motorized Ball Valve (MBV) Maintenance (Digital-scroll Compressors)
Discharge pressure is controlled by a motorized ball valve. During unloaded operation, the pressure
changes during each digital cycle could result in excessive repositions with a pressure operated water
regulating valve. The control algorithm for the motorized ball valve uses an intelligent sampling rate and
adjustable pressure thresholds to reduce valve repositions. The valve assembly consists of the brass
valve, linkage and actuator.
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 87

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Liebert PW017 Specifications

General IconGeneral
BrandLiebert
ModelPW017
CategoryControl Unit
LanguageEnglish

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