Daikin GCU2040PXB1 Инструкция по монтажу онлайн [19/177] 610032

4. All cable connections are tight.

5. Motor starter controls/contactor overloads are set correctly.

6. Check all contactors operate correctly.

13.6 Operational Checkout

When the system has been charged and has operated for at least 2 hours at normal operating conditions without

any indication of malfunction, it should be allowed to operate overnight on automatic controls. Then a thorough re-

3. Expansion valves must be checked for proper superheat settings.

Expansion valve probes must be in positive thermal contact with suction lines.

Valves with high superheat settings produce little refrigeration and poor oil return.

Too little superheat causes low refrigerant capacity and promotes liquid slugging and compressor oil removal.

LIQUID REFRIGERANT MUST BE PREVENTED FROM REACHING THE COMPRESSOR.

4. Using suitable instruments carefully check line voltage and amperages at the compressor terminals. Voltage

should be within 10% of the nameplate voltage.

The current should not exceed that on the nameplate rating. If amperage draw is excessive, immediately

determine the cause and take corrective action. On three phase motor-compressor, check to see that a balanced

load is drawn by each phase. Check all fan motors on air-cooled condensers and in fixture evaporator coils for

6. The hints and procedures on commissioning are based on experience to date and checks made of units running

during both winter and summer periods. Do ensure that the settings of the components are correct before making

any adjustments.

7. DO NOT adjust components without satisfying yourself that there is good reason to do so. If adjustments are

carried out, record the final setting on the commissioning report.

13.5.1 Compressor bypass valve

Please refer to P&ID for compressor bypass valve position. The role of bypass valve is very critical for the rotary

compressor operation especially when the compressor is getting the signal to run. The valve is fully open when the

unit is switched off. This valve ensures the pressure balance between interstage and first-stage suction of the

compressor. That helps the compressor to start smothly.

14.

Service and Maintenance

The following notes are not designed as a definitive guide, the maintenance procedures should be applied in

conjunction with your companies work instructions and working practises. Any further information not covered by

this section may be obtained from Hubbard Products Ltd on request.