Method for Installation of HVAC System (Part-1)


  • This method explains the Procedures or sequence of activity for safely and efficiently installation and Testing of Refrigerant Pipes , Drain Pipes ,Indoor and Out Door Unit of HVAC System as per standard Practice and Code.

General Equipment & Tools:

  • The equipment that will be engaged for Installation of Cable works will be
  • Lifting crane , Transportation vehicle, Fork Lift
  • Winches, Pulling Rope , Welding machine
  • Lubricant (Soap based, wax based), Cleaning agent (CRP)
  • Copper pipe Flaring tools
  • Vacuum Pump,
  • Brazing Torch , Brazing Rod , Oxy-Acetylene Brazing Kit ,Wire Brush
  • Nitrogen Cylinders , Soldering Tools
  • Crimping tool, Drilling Machine with various Bits , Grinding Machine , Cutting Machine
  • Electrical Tool Box, Cable Cutter, Screwdriver, Pliers, Spanner.
  • Ladder , Scaffolding / Mobile scaffold
  • Nylon rope, Marker , Leveling device , Tape measure
  • Removable Barricades , Portable Lights
  • Testing Equipment for System
  • Multi meter ,Clamp Meter
  • Refrigerant / Nitrogen cylinder,
  • Vacuum Gauge

Storage & Material Handling:

  • The storage area must be free from dust and Water leakages / seepages.
  • Manufacturer recommendation shall always be followed in loading/unloading and storing of Material.
  • Material and its accessories shall be unloaded handle with care in designated area of the Store (Do not directly drop to Ground) to avoid any damages.
  • Materials shall be stored in a dry place which is free from water or from weather effects and protection should be given to the material by means of covering the material with Tarpaulin sheet.
  • The Material will be stacked / unload in the site store on a proper stand on wooden loft on a flat surface at a sufficient height from Ground.
  • The A/C Units should be kept on the wooden platform and covering with polythene to protected from any dust or mechanical damages
  • For storing the copper pipes:
  • If pipes will be used soon, nozzle should be sealed by plastic bag or tape.
  • If pipes will be stored for a long time, the pipes should be charged into 0.2 to 0.5MPa Nitrogen and the nozzle should be sealed by welding.

Inspection of Materials:

  • Check The Material according to its Type, Size, Make
  • Physical Damages Inspection:
  • Damage on Pipes and Units.
  • Damage on insulation of Cable
  • In case of any damages observed during inspection, the Material shall be returned to the supplier for replacement.

 Installation of Outdoor Units :

 (a) Transporting / Lifting the Outdoor Unit

  • Use appropriate moving equipment to transport outdoor Unit, ensure the equipment is capable of supporting the weights. When lifting the unit, use lifting straps and place around the unit.
  • Always lift the unit using appropriate size of lifting straps rated to carry the unit weight and long enough to maintain a maximum of a 40° angle as shown.
  • When moving / adjusting the placement of the outdoor unit, always hold the unit by the corners. Moving the outdoor unit using the side intake holes on the frame may damage the frame.
  • Consider the unit’s center of gravity before lifting. Hoist the unit with the center of gravity centered among the lifting straps. There is a risk of the product falling and causing physical injury.
  • Lift the outdoor unit from the base at specified locations. Support the outdoor unit at a minimum of six points to avoid slippage from the rigging apparatus.
  • Do not lay the unit on its side and do not slant the unit more than 30 degrees.

  • On a supporting structure that can bear the weight of the outdoor unit. The supporting structure can be a base on the ground, on a waterproof roof, or in a pit. With sufficient clearances around the unit for service and repairs. In a well-ventilated location. Away from strong wind.
  • Away from direct exposure to rain or snow. Where there is no risk of flammable vapor leakage. Where there is no exposure to salt, machine oil, sulfide gas, or corrosive environmental conditions.

(b) Selecting the Best Location for the Outdoor Unit(s)

  • Don’ts:
  • Do not install the unit in an area where combustible gas may generate, flow, stagnate, or leak. These conditions can cause a fire.
  • Do not install the unit in a location where acidic solution and spray (sulfur) are often used or in environments where oil, steam, or sulfuric gas are present.
  • A location that allows for optimum air flow and is easily accessible for inspection, maintenance, and Where piping between the outdoor unit and indoor unit(s) / heat recovery units are within allowable Limits.
  • Avoid placing the outdoor unit in a low-lying area where water could accumulate.
  • If the outdoor unit is installed in a highly humid environment (near an ocean, lake, etc.), ensure that the site is well-ventilated and has a lot of natural light (Example: Install on a rooftop).
  • Where operating sound from the unit will disturb inhabitants of surrounding buildings.
  • Where the unit will be exposed to direct, strong winds.
  • Where the discharge of one outdoor unit will blow into the inlet side of an adjacent unit (when installing multiple outdoor units).

  • If the outdoor unit is not placed on a roof, place it on the leeward side of the building or in a location where the unit will not be ex­posed to constant wind.
  • If placement exposes the unit to constant wind activity, construct a wind break in front of the unit. Follow the placement guidelines set

  • Avoid installing the outdoor unit where it would be directly exposed to ocean winds.
  • Install the outdoor unit on the side of the building opposite from direct ocean winds.
  • Select a location with good drainage and periodically clean dust or salt particles off of the heat exchanger with water.
  • Ocean winds may cause corrosion, particularly on the condenser and evaporator fins, which, in turn could cause product malfunction or inefficient performance.
  • If the outdoor unit must be placed in a location where it would be subjected to direct ocean winds, install a concrete windbreaker strong enough to block any winds. Windbreaker height and width must be more than 150% of the outdoor unit, and be installed at least 27.5 inches away from the outdoor unit to allow for airflow.

  • Rubber anti-vibration pads are necessary to avoid vibration.

  • Foundation can be made of channel steel or concrete.

  • Reserve the space for discharging condensate water from outdoor units.
  • The outdoor unit should be placed neatly, and reserve enough space for maintenance.
  • The outdoor unit should be installed in the place that is dry, well-ventilation and close to the indoor units.

About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

6 Responses to Method for Installation of HVAC System (Part-1)

  1. Good afternoon Mr. Jignesh, how can i contact you regarding the electrical load calculation for panel excel sheet? I need to add more rows because i have more loads. How can i do this? Do i need the password to unlock the spreadsheet?

  2. Jack says:

    Do you ever help with lighting. I am building a small office and need to somehow figure how much light I need.

  3. Yesudas Mathew says:

    Dear Jignesh, I have tried to transfer money, 5000 fir 54 software , but payment not transferring. please advise
    Yesudas Mathew

  4. Er Nagaraj R says:

    Excellent,, thanks u so much sir.

    On Thu, 14 Jan, 2021, 9:11 pm Electrical Notes & Articles, wrote:

    > Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng) posted: “Purpose: This method > explains the Procedures or sequence of activity for safely and efficiently > installation and Testing of Refrigerant Pipes , Drain Pipes ,Indoor and Out > Door Unit of HVAC System as per standard Practice and Code. General > Equipment &am” >

  5. Roberts says:

    please do let me know how to repairs AC 1 TON inverter type

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