Mitsubishi Electric City Multi R2 Series Installation Manual page 31

9-5-2. Connecting pipes
・The refrigerant pipe from the outdoor unit is branched at the pipe end, and each branch is then connected to an
indoor unit.
Indoor unit
High-pressure pipe
Outdoor unit
Low-pressure pipe
Branched section
・When connecting pipes, make sure the service valves are completely closed.
・Commercially available pipes often contain dust or debris. Always blow them clean with a dry inert gas.
・Take care to prevent dust, water or other contaminants from entering the pipes during installation.
・Reduce the number of bending portions as much as possible, and make the bending radius as big as possible.
・Do not use any commercially available anti-oxidizing agents since they may cause pipe corrosion and degrading of
the refrigerant oil. Please contact Mitsubishi Electric for more details.
・Make sure that the pipes are not in contact with each other, unit panels, or base plates.
・Refer to the twinning kit Installation Manual for how to install the twinning kit.
<Refrigerant piping connection examples>
・Obtain joints and elbows on site as necessary according to the pipe diameter, and connect the pipes as shown in
the figures below.
(1) When routing the pipes through the front of the unit
Ⓓ
(2) When routing the pipes through the bottom of the unit
Ⓑ
<A> High-pressure side
<B> Low-pressure side
Ⓐ
Refrigerant service valve piping
Ⓑ
Reducer etc.
Ⓒ
Elbow
Ⓓ
On-site piping
WT08432X01
Connecting method
Brazed or flared
Brazed
Brazed
Brazed
<A>
<B>
Ⓑ Ⓐ
<A>
<B>
Ⓓ Ⓒ Ⓐ
GB-29