Connect The Drain Pipe - Midea Split Duct Air Conditioner Installation Manual

Table.9-2
Tubing size
Φ6.4mm
Φ9.5mm
Φ12.7mm
Φ15.9mm
Φ19.1mm
Fasten the nut
●
Put the connecting tubing at the proper position, wrench the
nuts with hands then fasten it with a wrench. (Refer to
Fig.9-4
●
Too large torque will harm the bellmouthing and too small will
cause leakage. Please determine the torque according to
Table.9-2.
The necessary filling amount of refrigerant
●
Refrigerant volume to be added is calculated according to
outdoor unit installation manual .Be sure to add refrigerant
measuring by a scale. L: The length of the pipe
●
Please record the quantity added and store it carefully for
future maintenance.
Expel the air with a vacuum pump (Refer to Fig.9-4) (Please
refer to its manual for the way of using manifold valve)
●
Loosen and remove the maintenance nuts of stop valves A
and B, and connect the charge hose of the manifold valve
with the maintenance terminator of stop valve A. (Be sure
that stop valves A and B are both closed)
Connect the joint of the charge hose with the vacuum pump.
●
●
Open the Lo-lever of the manifold valve completely.
●
Turn on the vacuum pump. At the beginning of pumping,
loosen the maintenance terminator nut of stop valve B a little
to check whether the air comes in (the sound of the pump
changes, and the indicator of compound meter turns below
zero). Then fasten the nut.
● When the pumping has finished, close the Lo-lever of the
manifold valve completely and turn off the vacuum pump.
●
When you have pumped for over 15 minutes, please confirm
that the indicator of multimeter is on -1.0X105Pa (-76cmHg)
●
Loosen and remove the quadrangle cover of stop valves A
and B to open stop valve A and B completely, then fasten
them.
●
Disassemble the charge hose from the repair-mouth of stop
valve A, and fasten the nut.
installation manual
15
Torque
14.4~17.2N.m
32.7~39.9N.m
49.5~60.3N.m
61.8~75.4N.m
92.7~118.6N.m
Manifold valve
Multi-meter
-76 cmHg
Lo-lever
Charge hose
Lo-lever
All the stop valves should be opened before test operation.
Each air conditioner has two stop valves of different sizes on
the side of the outdoor unit which operate as Lo-stop value, respec-
tively. (Refer to Fig.9-6)
Flare nut
Valve body
Valve stem

10. CONNECT THE DRAIN PIPE

Install indoor unit drain pipe
The outlet has PTI screw bread, Please use sealing materials
and pipe sheath (fitting) when connecting PVC pipes.
CAUTION
The drain pipe of indoor unit must be heat insulated, or it will
condense dew, as well as the connections of the indoor unit.
Hard PVC binder must be used for pipe connection, and make
sure there is no leakage.
With the connection part to the indoor unit, please be noted not
to impose pressure on the side of indoor unit pipes.
When the declivity of the drain pipe downwards is over 1/100,
there should not be any win ding.
The total length of the drain pipe when pulled out traversely
shall not exceed 20m, when the pipe is over long, a prop stand
must be installed to prevent winding.
Refer to the figures on the right for the installation of the pipes.
1.5M~2M
Pressure meter
Hi-lever
Charge hose
Fig.9-5
Vacuum pump
Stopper
Cap
Fig.9-6
Fig.10-1
Bend
S shap