Specifications

114
NLUO PMC CONTRACTOR
SIGNATURE AND SEAL SIGNATURE AND SEAL SIGNATURE AND SEAL
Y-Joints
Supply & installation of Y- Joints/separation refrigeration pipe joints and headers in the appropriate orientation to enable
correct distribution of refrigerant. The distribution joints should be factory insulated with pre-formed section of Expended
polystyrene/Equivalent.
3.2 REFRIGERANT PIPING
• Refrigerant piping for the air-conditioning system shall be upto 15.88mm dia. of soft seamless copper tubes & for
above 15.88mm dia the pipe material shall be of hard seamless copper tubes with pipes material being hard drawn
copper pipe.
• Before jointing any copper pipe or fittings, its internals shall be thoroughly cleaned by passing a clean cloth via wire
or cable through its entire length. The piping shall be continuously kept clean of dirt etc. while constructing the
joints. Subsequently it shall be thoroughly blown out using nitrogen gas.
• After completion of installation of the refrigerant piping, the piping system shall be pressure tested using nitrogen
gas at a suitable pressure as specify by OEM (Original Equipment Manufacturer). Pressure shall be maintained in
the system for 48 hours. The system shall then be evacuated to a vacuum of not less than 700 mm Hg and held for
minimum 24 hours.
• The suction line pipe size and the liquid line pipe sizes shall be selected according to the manufacturer’s specified
diameter. All refrigerant pipes shall be properly supported and anchored to the building/structure using steel
hangers, fastener, brackets and supports which shall be fixed to the building/structure by means of inserts or
expansion shields or anchor fasteners of adequate size and number to support the load imposed thereon.
• The refrigerant piping should be laid in core cut in the floors in such a way that it should not distort the interior of
the room, wherever the refrigerant pipe has to be laid across the room, it should be laid in a concealed manner by
making appropriate boxing arrangement matching with the interior of the room. All associated minor Civil
Engineering works (like chasing on wall, ceiling & replastering and repainting etc.) related with the above items are
included in the scope of work.