Connect The Drain Pipe - Midea MFA-12HRN1 General Information Manual

Connect the Drain Pipe

4.2.2 Additional Refrigerant Charge
Caution:
Refrigerant cannot be charged until field wiring has been completed.
Refrigerant may only be charged after performing the leak test and the vacuum pumping.
When charging a system, care shall be taken that its maximum permissible charge is never exceeded,
in view of the danger of liquid hammer.
Charging with an unsuitable substance may cause explosions and accidents, so always ensure that the
appropriate refrigerant is charged.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when charging refrigerant.
The outdoor unit is factory charged with refrigerant. Calculate the added refrigerant according to the
diameter and the length of the liquid side pipe of the outdoor unit/indoor unit connection.
R(g)
L(m)
Less than 5m (One-way)
Added refrigerant when over 5m (One-way)
R(g): Additional refrigerant to be charged
L(m): The length of the refrigerant pipe(one-way)
D(mm): Liquid side piping diameter
5. Connect the Drain Pipe
5.1 Install the drainpipe of the indoor unit
The outlet has PTI screw bread, Please use sealing materials and pipe sheath(fitting) when connecting PVC
pipes.
Caution:
1) The drain pipe of indoor unit must be heat insulated, or it will condense dew, as well as the connections
of the indoor unit.
2) Hard PVC binder must be used for pipe connection, and make sure there is no leakage.
3) With the connection part to the indoor unit, please be noted not to impose pressure on the side of indoor
unit pipes.
4) When the declivity of the drain pipe downwards is over 1/100, there should not be any winding.
5) 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.
6) Refer to the figures on the right for the installation of the pipes.
48
D(mm)
Φ6.4
—
11g/m×(L-5)
MCAC-UTSM-2009-03
Φ9.5
—
30g/m×(L-5)
Installation