Fig. 16 – Outdoor Unit Clearances
6.0 REFRIGERATION CHARGE & PIPE-WORK
WARNING:
• Both indoor and outdoor units come delivered under positive pressure
• The Outdoor Unit is charged with sufficient R410a refrigerant for an interconnecting pipe run of 10m actual length
• The indoor unit is pressurised with 400kPa to 700kPa dry nitrogen
• Pipe end blanking plates must not be removed until the installer is sure the plates are not under positive pressure.
• A suction accumulator and oil separator has been fitted in the outdoor units
• Read all instructions and notes below before starting installation
• For flare connections please refer to section 6.2.
CAUTION:
• Use new, clean and sealed refrigeration grade pipe suitable for R410a
• Keep pipe ends sealed, both before and during installation, to avoid entry of moisture
• Suspend pipes with hangers or straps and seal openings around pipe penetrations with flexible material.
• Consider pipe expansion and leave space between pipes and adjacent structures
• Use brazing shields where required
• When brazing in the vicinity of valves likely to be affected by heat, they shall be lagged with a wet cloth
• All brazing operations must be completed with a small steady stream of nitrogen passing through the pipe-work to
limit scale build up and moisture contamination
• Never use the unit compressor as a vacuum pump
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