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INSTALLATION INSTRUCTIONS
4. Refrigerant pipe Installation (cont)
Select Piping Material
• Make sure both the internal surface and external surface of the pipes are intact and are free from harmful contaminants
such as Sulphur, copper oxide, foreign matter, cutting powder, grease and water.
• Please use the following materials for refrigerant pipe:
Connection kit-indoor max. single pipe length
Connection kit- electrical box max. distance
Pipe length between outdoor unit & AHU VALVE
Pipe length between AHU valve & AHU
Height difference between indoor and outdoor (MRV5)
Height difference between outdoors (in the same system)
• The branch pipe must have refrigerant branching suite. For selection of refrigerant branching suite and max height drop
between indoor units, please refer to the installation instructions or technical data attached to the outdoor unit.
Piping Maintenance
During installation, provide maintenance as specified in the table in order to prevent water, foreign matter and dust from
entering the pipes.
Location
Work Period
Outdoors
More than 1 month
Less than 1 month
Indoors
–––
NOTE:
Particularly when a pipe is to penetrate through a wall or extend to outdoors, make sure foreign matter and dust etc.
cannot enter the pipe.
31-5000593 Rev. 0
Connection Kit
Connection Kit
Outdoor
Connection Kit
Maintenance Method
Screw
Screw or Strap
Min16.4ft (5m), max.164ft (50m)
Outdoor is above
Outdoor is below
Max length 16.4ft
Indoor
Max length 16.4ft
Electrical Box
Indoor
All Units
16.4ft (5m)
16.4ft (5m)
Max.16.4ft (5m)
131ft (40m)
164ft (50m)
16.4ft (5m)
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