Refrigerant Piping Work - Mitsubishi Electric SUZ-SWM40 Installationshandbuch

5. Refrigerant piping work

A
(B)
(C)
Fig. 5-1
A
ø12.7
Fig. 5-2
(A)
Indoor unit
A
Outdoor unit
B
B
Indoor unit
A
Outdoor unit
B
ø6.35
B
5.1. Refrigerant pipe (Fig. 5-1)
► Check that the difference between the heights of the indoor and outdoor
units, the length of refrigerant pipe, and the number of bends in the pipe are
within the limits shown below.
(A) Pipe length
Models
(one way)
SWM40/SWM60/SWM80 5 m - 30 m
• Height difference limitations are binding regardless of which unit, indoor or out-
door, is positioned higher.
• Refrigerant adjustment ... If pipe length exceeds 10 m, additional refrigerant (R32)
charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 10 m.)
Up to 10 m No additional charge is required.
Pipe length
Additional charge is required.
Exceeding 10 m
(Refer to the table below.)
SWM40 20 g × (refrigerant piping length (m) -10)
Refrigerant
SWM60 20 g × (refrigerant piping length (m) -10)
to be added
SWM80 20 g × (refrigerant piping length (m) -10)
(1) Table below shows the specifications of pipes commercially available. (Fig. 5-2)
Outside diameter
Model Pipe
mm
For liquid 6.35
SWM40
For gas 12.7
For liquid 6.35
SWM60
For gas 12.7
For liquid 6.35
SWM80
For gas 12.7
(2) Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
(3) Refrigerant pipe bending radius must be 100 mm or more.
Caution:
Using careful insulation of specified thickness. Excessive thickness prevents
storage behind the indoor unit and smaller thickness causes dew drippage.
• Be sure to have appropriate ventilation in order to prevent ignition. Furthermore,
be sure to carry out fire prevention measures that there are no dangerous or flam-
mable objects in the surrounding area.
• R32 maintenance refilling: Before servicing refilling the equipment with R32 to
ensure that there is no risk of explosion from electrical sparks it must be ensured
that the equipment machine is 100% disconnected from the mains supply.
(B) Height (C) Number of
difference bends (one way)
Max. 30 m Max. of 10
Maximum
amount of
refrigerant
Min. wall Insulation Insulation
thickness thickness material
inch
1/4 0.8 mm 8 mm
1/2 0.8 mm 8 mm
Heat resisting
1/4 0.8 mm 8 mm
foam plastic
0.045 specific
1/2 0.8 mm 8 mm
gravity
1/4 0.8 mm 8 mm
1/2 0.8 mm 8 mm
en
1.6 kg
1.6 kg
1.6 kg
5