Pipe Length And Drop Height - MrCool DIY-MULTI2-18HP230C Service Manual

2. Pipe Length and Drop Height

The length and elevation of connection pipe are shown in the table below. if the pipe length exceeds max pipe length,
additional refrigerant should be charged to ensure nominal cooling/heating capacity.
Max. length for all rooms (m)
Max. length for one IU (m)
Max. height difference between IU and OU (m)
Max. height difference between IUs (m)
Additional refrigerant charge
Connective Pipe Length(m)
Pre-charge pipe length (ft/m)
(pre-charge pipe length xN )
More than (pre-charge pipe lengthxN) ft/m
Caution:
• Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension pipe, refer
to the tables below.
• When refrigerant pipe diameter is different from that of outdoor unit union , additional transfer connector needs to
be used on outdoor unit.
Indoor unit
Model
9k,12k
18k
24k
30k,36k
Outdoor unit union diameter (mm/inch)
(Total pipe length - pre-charge pipe lengthxN) x15g/m
(Total pipe length - pre-charge pipe lengthxN) x0.16oZ/ft
Pipe diameter (mm/inch)
Liquid 6.35(1/4)
Gas 9.52(3/8)
Liquid 6.35(1/4)
Gas 12.7(1/2)
Liquid 9.52(3/8)
Gas 15.9(5/8)
Liquid 9.52(3/8)
Gas 19(3/4)
1 drive 2
1 drive 3
1 drive 4
1 drive 5
 Specifications 4
1 drive 2 1 drive 3 1 drive 4
30 45
15 15
10 10
10 10
Additional Refrigerant
NA
Extension pipe diameter (mm/inch)
Liquid
Gas
Liquid
Gas
Liquid
Gas
Liquid
Gas
Liquid
Gas
Liquid
Gas
Liquid
Gas
Gas
Liquid
Gas
Gas

1 drive 5
60 75
15 15
10 10
10 10
6.35(1/4)
9.52(3/8)
6.35(1/4)
12.7(1/2)
9.52(3/8)
15.9(5/8)
9.52(3/8)
19(3/4)
6.35(1/4)*2
9.52(3/8)*2
6.35(1/4)*3
9.52(3/8)*3
6.35(1/4)*4
9.52(3/8)*3
12.7(1/2)*1
6.35(1/4)*5
9.52(3/8)*3
12.7(1/2)*2