Mitsubishi Electric PURY-(E)P-YLM-A (-BS) Installation Manual page 29

<A> Refrigerant service valve (high-pressure/brazed)
<B> Refrigerant service valve (low-pressure/brazed)
<C> (EP models only)
Refrigerant service valve (low-pressure gas/brazed)
Used only when a separately-sold unit is attached. Refer to the Installation Manual of the unit for details.
Ⓐ Valve shaft
The unit is shipped with the valve closed. Keep the valve closed while connecting pipes or evacuating the system. Open the valve upon
completion of this work.
Turn the shaft counterclockwise as far as it will go (90˚) to open the valve, and clockwise to close it.
Ⓑ Stopper pin
Prevents the shaft from turning 90˚ or more.
Ⓒ Service port
Through the service ports, you can charge refrigerant, remove the gas in the pinched connecting pipes, or evacuate the system.
Ⓓ Cap
Remove the cap before turning the shaft. Put the cap back on upon completion of all work.
Ⓔ Severed section of the pinched connecting pipe
Ⓕ Brazed section of the pinched connecting pipe
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
・Refer to section 5 "Package contents" for details about the supplied connecting pipes.
・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.
(1) P models
When routing the pipes through the front of the unit
Ⓑ
Ⓐ
* The figure shows a unit on which an outdoor unit twinning kit
(low-pressure side) is not installed.
WT07282X01
Connecting method
Brazed or flared
Brazed
Brazed
Brazed
Ⓒ
Ⓓ
Ⓔ
Ⓕ
Ⓖ
Ⓗ
Ⓑ
Ⓐ
Ⓘ
Ⓙ
Ⓚ
Ⓗ
* The figure shows a unit on which an outdoor unit twinning kit
(low-pressure side) is installed.
GB-27