Service manual

11.4.3 Install the connecting pipe
Select the connecting pipe according to Table 11-2.
Table 11-2
Pipe Size(mm)
Item
Model
Gas Pipe Liquid Pipe
Max.
Length
(ｍ)
Max. Height
Difference
between
Indoor and
Outdoor(ｍ)
Adding of
Refrigerant
(For Extra
Length)
ASD-09A 1/4＂ 3/8＂ 20 15 15
ASD-12A
ASD-18A
1/4＂ 1/2＂ 20 15 20
ASD-24A φ9.52 φ16 30 15 60g/m
ASD-36A
ASD-41A
φ12 φ19 50 30 120g/m
ASD-60A φ12 φ22 50 30 120g/m
The layout of connecting pipes must be in accordance with site conditions by referring to the following
principles:
1. Shorten the length of connecting pipe to its minimum, better within 5m.
2. Reduce the height difference between indoor unit and outdoor unit to its minimum.
3. Minimize the number of elbows on connecting pipe.
4. If the connecting pipe is over 20m, it is required to check if the system lubricant is sufficient.
Add if necessary.
5. The quantity of refrigerant inside the unit is applicable to the connecting pipe 7m long. For
extended length of connecting pipe, more refrigerant shall added. For every 1-meter extra
length, the quantity of refrigerant to be added is shown in the table below. The maximum
allowable pipe length is 30m.
6. If the height difference between indoor unit and outdoor unit is over 10m, one trap elbow shall
be installed every 6 meters.
If the indoor unit and outdoor unit are on different height, please arrange the pipes by referring to the
illustration below.
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