Midea CSU 12HCAA, Installation And Maintenance Manual

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Installation & Maintenance Manual
4-3 Pipeline connection
4-4 air purge Leak test
Connect liquid/gas fitting pipes to indoor unit.
Pipeline diameter
6.35mm(1/4")
9.52mm(3/8")
Torque (N M)
12.7mm(1/2")
13.7--17.6
34.3--41.2
49.0--56.4
Pipeline connection for indoor unit
As per the same method for indoor unit, connect the fitting pipe to pipe joint.
of shutoff valve (2-way and 3-way valves) on outdoor unit.
Use torque -adjustable spanner or wrench to fasten it at same moment as that for indoor unit.
Pipe connection of outdoor unit
Air purge procedures
Connect the coolant pipeline (liquid and gas pipelines)
between indoor unit and outdoor unit.
Remove the access door cover of shutoff valve aside the gas pipeline of outdoor unit. (The shutoff valve
reserved in factory-leaving state cannot function, because it is still completely sealed by a cap).
Connect the gauge manifold valve and vacuum pump to the access
door of shutoff valve aside the gas pipeline of outdoor unit.
Rotate the vacuum pump (vacuumize it for 15 minutes at least).
Use gauge manifold valve to check the vacuum degree,
and close the gauge manifold valve, stop the vacuum pump.
Lay it aside for one two minutes, and then check if the pointer of gauge manifold valve still points
to the original position. Check if the pressure is -0.1mega pascal (-76cm mercury column).
Close
Open
Allen wrench Shutoff valve
Shutoff valve
Liquid pipeline
Allen wrench
Gas pipeline
Cap
Shutoff valve
Access door
Vacuum pump
Connecting pipeline
Gauge manifold valve
Apply a layer of sealing oil on surface of pipe saddle (put it inside
installation attachments) .
Firstly align it to the center and connect it, and then manually screw down
the conical nut for 3-4 turns.
Refer to the following moment table; use 2 pcs of spanners to fasten the
pipe joints at side of indoor unit.
15.88mm(5/8") 73.0--78.0
VI. Installation instructions