Refrigerant Piping Connection; Connection Instructions -Refrigerant Piping - INVENTOR V5MFI-66 User & Installation Manual

Refrigerant Piping Connection

When connecting refrigerant piping, do not let substances or gases other than the speci ed
refrigerant enter the unit. The presence of other gases or substances will lower the unit's capacity,
and can cause abnormally high pressure in the refrigeration cycle. This can cause explosion and
injury.
Note on Pipe Length
Ensure that the length of the refrigerant pipe, the number of bends, and the drop height
between the indoor and outdoor units meets the requirements shown in the following table:
The Maximum Length And Drop Height Based on Models. (Unit: m/ft.)
Type of model
North America,
Australia and the
European frequency
conversion Split
Type
Other Split Type
Bends: no more than 5 places. A minimum pipe run of 3 metres is required to minimise vibration &
excessive noise.
CAUTION
Oil traps
If oil flows back into the outdoor unit's
compressor, this might cause liquid
compression or deterioration of oil return.
Oil traps in the rising gas piping can prevent
this.
An oil trap should be installed every 6m(20ft)
of vertical suction line riser
(＜36000Btu/h unit).
An oil trap should be installed every
10m(32.8ft) of vertical suction line riser
(≥36000Btu/h unit).
 Page 30 
Capacity (Btu/h)
<15K
≥15K - <24K
≥24K - <36K
≥36K - ≤60K
12K
18K-24K
30K-36K
42K-60K
Length of piping
25/82
30/98.4
50/164
75/246
15/49
25/82
30/98.4
50/164
Indoor unit/
Outdoor unit
Maximum drop height
10/32.8
20/65.6
25/82
30/98.4
8/26
15/49
20/65.6
30/98.4
Indoor unit/
Outdoor unit
6m/20ft
(＜36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)
6m/20ft
(＜36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)