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6.0 REFRIGERATION CHARGE & PIPE-WORK
WARNING:
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Both indoor and outdoor units come delivered under positive pressure
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The Outdoor Unit is charged with sufficient R410a refrigerant for an interconnecting pipe run of 15m actual length
The indoor unit is pressurised with 400kPa to 700kPa dry nitrogen
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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
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Read all instructions and notes below before starting installation
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For flare connections please refer to section 6.2.
CAUTION:
Use new, clean and sealed refrigeration grade pipe suitable for R410a
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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
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Consider pipe expansion and leave space between pipes and adjacent structures
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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
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All brazing operations must be completed with a small steady stream of nitrogen passing through the pipe-work to
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limit scale build up and moisture contamination
Never use the unit compressor as a vacuum pump
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Fig. 16 – Outdoor Unit Clearances
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