Connecting Pipes - Mitsubishi Electric CITY MULTI PURY-P72ZKMU-A Manuel D'installation

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.
<Front pipe routing>
When not attaching a low-pressure twinning pipe
<A>
<B>
<Bottom pipe routing>
When not attaching a low-pressure twinning pipe
<A>
<B>
<A> Low-pressure side
Ⓐ Refrigerant service valve piping
Ⓒ Elbow
Ⓕ On-site piping (high-pressure connecting pipe) Ⓖ Twinning Kit (sold separately)
Ⓗ On-site piping (low-pressure connecting pipe: to BC controller)
Ⓘ On-site piping (low-pressure connecting pipe: to outdoor unit)
*1 For the attachment of the Twinning pipe (sold separately), refer to the instructions included in the kit.
*2 Connection pipe is not used when the Twinning Kit is attached.
WT07828X01
Connecting method
Brazed or flared
Brazed
Brazed
Brazed
A
B
C
D
E
F
A
D
E
F
<B> High-pressure side
Ⓑ On-site piping (Adjust the pipe's position to the knockout hole.)
Ⓓ Reducer etc.
GB-19
When attaching a low-pressure twinning pipe *1,*2
<A>
<B>
When attaching a low-pressure twinning pipe *1,*2
<A>
<B>
Ⓔ On-site piping (low-pressure connecting pipe)
G
H
I
F
G
I
H
F