Service And Maintenance - Daikin HUBBARD HCU2040PXB1 Installation, Commissioning And Maintenance Manual

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
correct rotation. Fan motor mounts and fan blades should be carefully checked for tightness and proper alignment.
All motors requiring lubrication should be oiled or greased as per manufacturer's recommendations. Check all
electrical load bearing terminals for tightness.
5. When this stage is reached, the unit can now be left running on full automatic operation, commissioning sheets
checked and completed (Section 9). The plant should be allowed to run for a further few days and then a further
check made of all controls and any minor adjustments made.
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.
13.7Lubrication Oil Condition (guide)
Complete system oil change is not needed. Additional oil charge and more information can be found in oil charge
section.
14. Service and M aintenance
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.
14.1 Oil M anagem ent System
Oil management system fitted on unit HCU2040PXB1 is high pressure system.
The unit is fitted with a suitable sized coalescent oil separator/reservoir. The suction line has to be properly sized
to provide good oil return. Standard practice for oil traps must be followed when condensing unit or evaporator are
installed at diffeferent heights.
To assist with service/maintenance operations, shut-off valve is fitted to enable isolation.
The maximum high difference alloawance between condensing unit and evaporator should be no more than 15
meters. In case install outdoor unit under indoor unit, provide riser piping is close to indoor unit as shown below.
Copyright HPL March 2021
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P4367 Rev 01