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4) Manifold attached foam can not be taken as insulating material.
5) When wrapping the tape, the later circle should cover half of the former one. Don’t
wrap the tape so tightly, otherwise the insulation effect will be weakened.
6) After wrapping the pipe, adopt sealing material to completely fill the hole so as to
prevent wind and rain from entering the room.
4.3.4 Support and protection for pipeline
(1) Support should be made for hanging connection pipe. Distance between each support
can not be over 1m (39-3/8in.).
(2) Protection towards accidental damage should be made for outdoor pipeline. When the
pipeline exceeds 1m (39-3/8in.), a pin. board should be added for protection.
4.4 Air Purging and Refrigerant Charge
4.4.1 Air purging
(1) Confirm outdoor liquid and gas valves are closed. Air puring from the nozzel located on
liquid and gas valves by vacuum pump.See Fig.41.
(2) When there are more than 2 outdoor units, air purging from the nozzel located on the oil
balance valve. Confirm outdoor oil balance valves are closed. See Fig.41.
Fig.41
4.4.2 Additional refrigerant charging
Outdoor unit has been charged refrigerant before delivery.
Charge additional refrigerant for field-installed connecting pipe. If the pipeline is longer
than 1m (39-3/8in.), please refer to the following table for charging amount of refrigerant.
(Liquid pipe prevails).
How much additional refrigerant should be charged.
Total refrigerant charging amount R= Pipeline charging amount A + ∑charging amount B
of every module.
(1) Pipeline charging amount.
Added refrigerant quantity A for piping = ∑Liquid pipe length × Added refrigerant quantity
for each meter(in.) of liquid pipe
Lennox
VRF Unit
