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1. Purpose
The purpose of this methods statement is to describe the systematic and quality procedure for the different activities required for the installation, testing & commissioning of wall-mounted split AC to make sure that all Dismantle, Relocate, Installation, Testing & Commissioning Wall Mounted Split AC works are accomplished by following the contract specification, approved shop drawings and as per the Manufacturer’s Instruction and recommendation.
2. Scope
This method of statement covers the dismantling, relocation, re-installation, test and commissioning of decorative split Air Conditioning, units with a cooling capacity of 1.5 to 3 tons. Include all associated civil, electrical, and mechanical works required for installation and operation.
3. Responsibility
It will be the responsibility of the Project Manager and Project Engineer to ensure the availability of coordinated drawings and the required materials as per the project specifications. Split A/C will be commissioned by the experienced foreman/Technician under the supervision of site engineers. QHSE Team is responsible to ensure the implementation of the method of statement, safety norms and implementing the risk assessment measure.
4. Legislation & Code of Practice
All dismantling, relocation, installation, testing & commissioning wall-mounted split AC work shall be accomplished following mentioned in the project specifications.
5. References
Approved material submittal
6. Definitions
PPE Personal Protective Equipment
ITP Inspection & Testing Plan
PM Project Manager
PE Project Engineer
QC Quality Control
HSE Health, Safety & Environment
7. Required Equipment
- Manifold kit with pressure gauge Ammeter.
- Thermometer, Anemometer, DB meter
- Drilling Machine
- Copper tube Cutter
- Gas welding set
- Vacuum pump & tube bender
- Mechanical/Electrical Hand tools
8. Safety Precautions
- Risk assessment/hazard identification for all activities has been conducted and attached as an annexure, all mandatory control measures should be taken as described in the RA.
- Proper safe access and egress to the Installation area shall be provided.
- Manufacturer's recommendations must be followed for health and safety
- Workmen shall wear all appropriate safety personnel protective equipment such as helmets, Coverall clothing, safety shoes, goggles, gloves etc. wherever required.
- If All dismantling, relocation, installation, testing & commissioning of wall-mounted split AC work is at a high level, only secure and approved scaffolding and safety belts should be used.
- Enough light shall be ensured before the start of the work.
- A safe Permit to Work (PTW) shall be received where needed as per the instructions of the health and safety department.
- Follow the safety norms for Electrical and Mechanical safety.
9. Methodology
9.1. Dismantle and relocation of the unit
- Electrical power off for the units
- Disconnect the pipes
- Demount the air conditioning unit and cautiously shift to the approved location
- Disconnect the pipes and demount the outdoor condenser and cautiously shift the approved location
- Move all pipes and electrical cable to the approved new location
9.2. Decorative type Split Unit
- Split AC units are identified as per the shop drawings accordingly.
- Appropriately Check and make sure that the Split AC units are observed and inspected closely for physical destructions.
- Check and confirm the Model Number.
- All split AC Units Carefully shift to the location as per the drawing safely.
- Dimensions of supports are marked on the ceiling.
- Holes are drilled on the marks and unfix is inserted in the holes.
- Threaded rods are fixed, and the check nut is tightened.
- Split unit support is inserted carefully through the threaded rods.
- The washer and check nuts are fixed.
- The split AC unit is carefully checked for proper slope for drainage.
- Accessibility for maintenance is ensured.
- The AC Units filter is removed and re-fixed for cleaning purposes accordingly.
9.3. Condensing Unit
- Condensing units are identified according to save drawings.
- Check and make certain that the Condensing devices are inspected for physical damages.
- Check and Confirm the Model Number.
- Condensing devices are shifted to the region as according to the drawing.
- Condensing gadgets are located on the stand.
- Accessibility for preservation is ensured.
- Refrigerant Piping
- Split AC Refrigerant copper coils are selected as per the planning and schedule and as per the approved list of Split AC Units materials.
- Coils Route (CR) is highlighted and marked at the site, as per the approved shop drawings accordingly.
- Prefabricated supports are fixed onto the structure using hand tools as per the marking.
- For the installation of refrigerant, copper coils are to be cut into the required length using the tube cutter with great care.
- The ends are properly cleaned.
- Insert Insulation (closed-cell electrometric rubber foam thermal insulation as in step with the accepted MAR on Copper Pipe, depart 40-50 mm for brazing the joints.
- Braze all the joints and ensure all the joints are leakproof in the refrigerant piping network.
- Complete the insulation at joints.
9.4. Power / Control wiring connection
- The control cable for the AC Units should be as per the engineer’s approved recommendations.
- Wires from power isolators are terminated to Air Conditioning Equipment as per the approved wiring diagram.
10. Testing and Commissioning Sequence /Methodology
10.1. Pre-Commissioning Procedure
- Make sure that the indoor & outdoor Split AC unit’s installation is complete as per the approved material.
- Next, carefully Check and observe the Split AC indoor & outdoor units are installed as per the approved drawings & manufacturer‘s instructions and recommendations.
- Check the refrigerant piping set up is complete with all the valves & add-ons in keeping with the approved save drawings
- Check for proper electric connection among the indoor & out of doors units & among outdoor units & the strength supply.
- Ensure that Fan coil alignment is adequate.
- Ensure that the A/C drain point is terminated.
- Ensure that copper pipe piping isn't pinched to avoid any blockage of glide refrigerant.
- Ensure that each outside gadget relates to the right indoor unit and is well hooked up with an anti-vibration mount.
- Make positive the filter of the indoor unit is smooth and the dirt loose.
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| INSTALLATION TESTING & COMMISSIONING OF WALL MOUNTED SPLIT AC |
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