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METHOD STATEMENT FOR TESTING & COMMISSIONING OF SPLIT UNITS

METHOD STATEMENT FOR TESTING & COMMISSIONING OF SPLIT UNITS

  1. PURPOSE
  2. SCOPE
  3. REFERENCE
  4. TOOLS / EQUIPMENTS / TEST INSTRUMENTS
  5. QUALITY CONTROL
  6. COMMISSIONING PROCEDURES
  7. INSPECTION & RECORDS
  8. SAFETY
  9. ATTACHMENTS

 

 

 

 

1.0 Purpose

The purpose of this procedure is to define the step by step method to implement the correct practices for the pre-commissioning & commissioning of “Split Unit” through the guidelines contained herein so as to ensure that the job execution complies with the project requirements and serves the intended function to satisfactory level.

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2.0 Scope

The scope of this Method Statement is to define the method of Testing and Commissioning of Split Unit installed within the project in accordance with the a part of commissioning checks at site.

3.0 References

  • Contract Specifications and Approved Shop Drawings
  • Approved Material Submittals
  • Manufacturer’s Instructions

4.0 Tools / Equipment /Testing Instruments

  • Digital Multimeter
  • Clamp Meter
  • Tachometer
  • Anemometer
  • Flow Hood Kit
  • Digital Thermometer
  • Psychorometer

5.0 Quality Control

  • In general, it shall be ensured by Site Engineer that product manufacturer’s recommendations are followed and shall be monitored by Project engineer.
  • The Project Engineer shall further oversee the Pre-commissioning and commissioning activity as per the approved method statement for Start-up and Commissioning of Split Units.
  • The Split Units shall be tested under direct supervision of manufacturer / local dealer’s representatives.

split unit installation

6.0 Commissioning Procedures

Mechanical

  • Carefully inspect the unit for any physical damages / dents.
  • Check and ensure the shipping bolts / clamps are removed.
  • Check tightness of all nuts / bolts, screws, fasteners, rubber vibration isolators etc. as applicable
  • Check the piping connections as per approved drawings.
  • Check the fan rotation freely by hand and the direction of rotations on initial startup.
  • Align the Unit in the direction of drain to maintain the gravity slope.

Electrical

  • Ensure the connected cables have been tested and verify the test reports.
  • Check all terminations are complete and tightened as required.
  • Check the cabling / wiring including grounding is completed and dressed neatly for thermostat.
  • Ensure all identification and labeling is completed.
  • Check the isolator is fixed close to the Split Units for emergency power shut-down.

Start Up and Test Preparation

  • Check the line voltage before energizing the power
  • Switch ON the power.
  • Verify for the proper operation of the Split Units motor.
  • Measure the current drawn (amperage) by Split Units and record the same.
  • Verify proper operation of the thermostat, supply air temperature.
  • Check for any abnormal noise and vibration on startup. Rectify as / if required.
  • After about an hour’s operation, check that all nuts / bolts, screws, clamps etc. are tight and secure for external units.
  • Record the Split Unit/External Unit name plate data in the commissioning format.
  • Record the ampere / voltage drawn by the compressor / fan of the outdoor unit.
  • Record the refrigerant pressure of the outdoor unit.
  • Ensure it is within the limits as per the Ambient temperature.

Ensure compliance to the manufacturer’s instruction as applicable.

7.0 Inspection & Record

  • Request for Inspection
  • Pre-commissioning & commissioning check lists

8.0    Safety 

 

  • All safety precautions shall be followed as per the established Project Safety Plan.
  • Only experienced and skilled technicians shall be engaged for carrying out Start-up and Commissioning of Split Units.
  • Safety Guards shall be in place and secured prior to start-up.
  • Cable test reports shall be verified prior to energisation.
  • Appropriate Warning signs and tapes shall be placed during start-up and commissioning as required.
  • All PPE shall be worn as appropriate according to the nature of the job.
  • Work area shall be maintained neat and clean.

9.0 Attachments

  • Schedule of Split Unit.
  • Commissioning Check list for Split Units

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