Refrigerant Piping Connection; Important Note On Pipe Length; Connection Instructions - Refrigerant Piping; Step 1: Cut Pipes - Bosch Climate 5000 RAC 2,6-2 OU Installation Manual

Refrigerant Piping Connection

7 Refrigerant Piping Connection
Fig. 27.
1.13

Important Note on Pipe Length

The length of refrigerant piping will affect the performance and energy
efficiency of the unit. Nominal efficiency is tested on units with a pipe
length of 5 meters. A minimum pipe run of 3 metres is required to
minimise vibration & excessive noise.
Refer to the table below for specifications on the maximum length and
drop height of piping.
Maximum Length and Drop Height of Refrigerant Piping per Unit
Model
Model Max. Length (m)
RAC 2,6-2 25
RAC 3,5-2
RAC 5,3-2 30
RAC 7-2 50
Table 5.
1.14 Connection Instructions – Refrigerant Piping

1.14.1 Step 1: Cut pipes

When preparing refrigerant pipes, take extra care to cut and flare them
properly. This will ensure efficient operation and minimize the need for
future maintenance. For R32 refrigerant models, the pipe connection
points must be placed outside of room.
1. Measure the distance between the indoor and outdoor units.
2. Using a pipe cutter, cut the pipe a little longer than the measured
distance.
3. Make sure that the pipe is cut at a perfect 90° angle. Refer to Fig. 28
for bad cut examples
90°
Oblique
Fig. 28.
18
Max. Drop Height
(m)
10
20
25
Rough Warped
WARNING
DO NOT DEFORM PIPE WHILE CUTTING
Be extra careful not to damage, dent or deform the pipe while cutting.
This will drastically reduce the heating efficiency of the unit.

1.14.2 Step 2: Remove burrs

Burrs can affect the air-tight seal of refrigerant piping connection. They
must be completely removed.
1. Hold the pipe at a downward angle to prevent burrs from falling into
the pipe.
2. Using a reamer or deburring tool, remove all burrs from the cut
section of the pipe.
Point down
Fig. 29.

1.14.3 Step 3: Flare pipe ends

Proper flaring is essential to achieve an airtight seal.
1. After removing burrs from cut pipe, seal the ends with PVC tape to
prevent foreign materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make sure they are facing in
the right direction, because you cannot put them on or change their
direction after flaring. See Fig. 30.
Flare nut
Copper pipe
Fig. 30.
4. Remove PVC tape from ends of pipe when ready to perform flaring
work.
5. Clamp flare form on the end of the pipe. The end of the pipe must
extend beyond the edge of the flare form in accordance with the
dimensions shown in the table below.
Climate 5000 – 6720886909 (2018/04)
Pipe
Reamer