The purpose of generating this Method Statement is to define the procedure step by step to implement the correct practices for Installation of FCU (Ducted &DX) through the guide line contained here in. Proper follow up shall ensure that the job execution complies with the requirements and serves the intended function to satisfactory level.
This Method Statement refers to various work procedures contained with in project control documents, which explains and covers the Installation of FCU (Ducted & DX Decorative type)
Responsibilities for implementation of this method statement relies on mechanical engineer who is in-charge of HVAC division
Required Tools / Equipment
- Fork Lift or Crane with capacity & arrangement in line with the Manufacturer’s , recommendations, pallet mover and as required at site.
- Hydraulic Trolley
- Portable hand tools.
- Portable Drilling Machine/ Grinding Machine & Angle Cutter.
- Spirit Level / Level Threads
- Step Ladder
- Scaffolding with platform.
Ducted or DX type Units and accessories shall be in line with the approved material submittal.
Handling and Storage
On receipt of the FCU (Ducted & DX type) and accessories at site, necessary precautions shall be taken for unloading, shifting & storage as follows:
All materials received at site shall be inspected and ensure that the materials are as per approved material submittals in terms of their make, model type, country of origin and capacity.
Upon arrival at site, the Ducted split Unit shall be off-loaded carefully at site by the Site Supervisor using necessary manpower and required equipment to ensure that no damage is caused to the Ducted Split Units.
At site all the Ducted Split Units will be stored in a clean / dry place and adequate covering by tarpaulin sheets will be done to protect the equipment from deposition of construction dust till they are finally shifted to their location.
Any discrepancies, damage etc., found will be notified and reported for further action.
Suitably and in case the repairs could not be done properly, the Ducted Split Units are to be sent to assembler for rectification, after all formalities carried on.
Make sure that all unit panels are fixed in place before moving .Raise and set the unit down carefully.
General Installation Requirements
Ensure that the proper clearance is available from civil side before commencement of works.
Ensure that the work area is clean and safe for carrying out the activities.
Prior to start of works, it shall be ensured that the relevant shop drawings and coordination drawings are approved and issued for construction.
It shall be ensured that all electrical requirements such as cable trays, cable Trunking, entry side lugs, glands etc. are finalized and coordinated.
It shall be ensured that no contradiction with other previously installed services, and if there is any shall be cleared.
It shall be ensured that the material issued is as per the approved material submittal.
Installation Procedure for FCU Ducted & DX Types
The following procedure shall be followed for the installation of Ducted Split Units:
Visually inspect the exterior casing of the ducted split units for any damages or any missing of the parts during shipping and transferring of the units.
Materials Inspection shall be done by Consultant for approval before proceeding the installation.
To prevent the damage while on transports, cut all banding (if applicable) loose from skid but do not remove the skids until the unit is shifted to the installation area.
Ensure that the installation of the ducted split unit is carried out in accordance with manufacturer’s installation recommendations and specification.
Prior to start of installation, refer to the approved shop drawing related to the area of installation and ensure that required material is available at site as per approved material submittals.
Ensure that the equipment and accessories are stored properly and there is no damage or deformity of any kind during transportation of material from site store to the working area.
After inspecting the work area, ensure that it is totally ready for installation. Then the required equipment shall be moved to the place of installation. Location should be able to support unit operating weight.
Check the equipment weight to ensure that the rigging equipment can handle that safely.
Before installing the unit check whether proper space is available for servicing or not. If there is any services installed previously in the same area shall be shifted to the side of the ducted split unit for easy future maintenance.
Proper marking shall be done for the unit location / supports as per approved shop drawing. Ensure the unit model number location shall be same as indicated on the drawing.
Under direct supervision of the Site Engineer / Site Supervisor will lift the ducted split unit and hang it to the required level with proper isolator and support fixing, allow sufficient space for service and air flow for unit as per the approved shop drawing and contract specification.
Make sure that all the spring isolators are in position and the ducted split unit is properly supported by the isolators through the hanging threaded rod of approved sizes.
Inspect and ensure any damages in coils and fins.
Ensure that all the filters are fixed properly.
Ensure that the ducted Split unit is properly leveled.
After the unit is leveled tighten the support bolts to secure them.
Connection of Pipes to Split Units
Connect the piping network to the Ducted Split unit as per the approved drawing.
Condensate drain pans shall be connected by using pvc pipe as per approved material submittal. The condensate pipe line shall be connected to nearest drainage point as per approved shop drawing. Trap shall be provided in the condensate drain line.
If any rigid material has been used for the drainage,it is necessary to provide some kind of elastic coupling in the drainage line to absorb possible vibrations.
The drainage line should always be below the connection itself,and also should be slope to facilitate the drainage.
Insulate the drain line as per manufacturer recommendation and contract specification.
Equipment, pipe identification, tagging & labeling shall be carried out after completion of all works.
To prevent electrical shock or equipment damage, make sure the power supply sections are open before electrical connections are made.If this action is not taken, personal injury may occur.
Electrical Wiring of Split Units
Field wiring must comply with valid codes.
Take special care while making the earth connection.
Fan motors shall be connected to wiring system as per the approved shop drawings.
Control wiring shall be carried out as detailed on respective approved controls shop drawing.
After the completion of the installation of the Ducted Split Unit electrical control and BMS connections shall be done as per approved shop drawings.
Once all these operations have been completed ,the false ceiling to hide unit may be installed, but a register cover must be eft below for future maintenance.Grills of an adequate size should be incorporated in the unit for return air suction.
Inspection and test plan