Midea CSU-05HCAA Installation And Maintenance Manual page 25

VI. Installation instructions
4. Completed connection of indoor and outdoor units and test run
4-1 flared joint
The flared joint is located on the indoor and outdoor sides.
Remove the valve cap of outdoor unit, and then connect the pipelines.
As shown in Figure below, coolant pipeline is used to connect indoor unit and
outdoor unit.
Connector
Indoor unit
Refrigerant pipeline
Model
5K/7K/9k
12k
18k
21k
24k
Refrigerant adjustment... If pipeline length is over 7m, auxiliary refrigerant (R22) is required.
(7m pipeline for outdoor unit is filled with refrigerant)
Pipeline length
Pipeline preparation
Fitting pipes of 3m or 4m are available.
Pipeline specifications listed in table below:
Pipeline
For liquid
For gas
It is required to properly insulate the 2 pcs of refrigerant pipeline so as to avoid condensation.
Bending radius of refrigerant pipeline must be greater than 100mm.
Cautiously select the specified insulation thickness. Excessive thickness may disturb the cumulation
at back side of indoor unit while insufficient thickness may lead to condensed water dripping.
Liquid pipe
Gas pipe
Access door
Max length
Max Height
of extended
difference (m)
fitting pipe (m)
10
15
15
15
15
Maximum length 7m
Longer than 7m
Outer diameter
Insulation thickness
Mm Inch
6.35 1/4
9.52 3/8
9.52 3/8
12.7 1/2
15.88 5/8
Installation & Maintenance Manual
Outdoor unit
Max number
of bent pipes
5 10 spots
10 spots
5
10 spots
5
10 spots
5
10 spots
5
Requiring no refrigerant replenishment
Requiring refrigerant
replenishment
6mm
6mm
Specific gravity of insulating
6mm
plastic foam is 0.045
6mm
6mm
Precautions:
23
Outer diameter of fitting pipe:(mm)
Gas pipe Liquid pipe
9.52
12.7
12.7
15.8
15.8
50g/m
Insulating material
6.35
6.35
6.35
9.52
9.52