Drain Piping; Flaring Work And Pipe Connection - Mitsubishi Electric MFZ-KA25VA Manual De Instrucciones

2-8. DRAIN PIPING

• If the extension drain hose has to pass through a room, be sure to
wrap it with commercially sold insulation.
• The drain hose should point downward for easy drain flow. (Fig. 1)
• If the drain hose provided with the indoor unit is too short, connect it
with drain hose (I) that should be provided at your site. (Fig. 2)
• When connecting the drain hose to the hard vinyl chloride pipe, be
sure to insert it securely into the pipe. (Fig. 3)
• When routing the drain piping, make sure that the drain hose (1) is
routed as shown. (Fig. 4)
• Insert the drain hose all the way to the base of the drain pan. (Fig. 5)
Make sure that the drain hose is securely caught on the projection in
the hole in the drain pan.
Fig. 4
2-9. FRONT PANEL INSTALLATION
1) Open the horizontal vane for the upper air outlet.
2) Fit the front panel onto the indoor unit from the front, and then push
the upper and lower areas that are marked with arrows.
3) Push the areas below the upper air outlet and the areas above and
below the lower air outlet that are marked with arrows.
4) After installing the front panel, install the 2 screws below the upper
air outlet.

3. FLARING WORK AND PIPE CONNECTION

3-1. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2) Completely remove all burrs from the cut cross section of pipe. (Fig. 3)
• Put the end of the copper pipe to downward direction as you
remove burrs in order to avoid to let burrs drop in the piping.
3) Remove flare nuts attached to indoor and outdoor units, then put
them on pipe having completed burr removal. (Not possible to put
them on after flaring work.)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension
shown in the table. Select A mm from the table according to the tool
you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is noted to be defective, cut off the flared section and do
flaring work again.
Pipe diameter Nut
(mm) (mm)
type tool
for R410A
ø 6.35 (1/4") 17
ø 9.52 (3/8") 22
0 to 0.5
ø12.7 (1/2") 26
ø15.88 (5/8") 29
6
Make sure to
Protrusion*
hook the catch
Drain hose
* The protrusion is located behind the
drain connecting portion when seen
from the front of the unit.
Fig. 5
A (mm)
Clutch Clutch type Wing nut
tool type tool
for R22 for R22
13.7 to 17.7 140 to 180
1.5 to 2.0
34.3 to 41.2 350 to 420
1.0 to 1.5
49.0 to 56.4 500 to 575
2.0 to 2.5
73.5 to 78.4 750 to 800
Downward
slope
Fig. 1
Do not make drain piping as shown below.
Do not raise
Water
leakage
Tip of drain
hose dipped
in water
Water
leakage
Copper
pipe
Fig. 1
Burr
Fig. 3
Tightening torque
N•m kgf•cm
Die
Flare nut
Fig. 5
Drain hose
Drain
hose
Hard vinyl chloride
70 cm or
pipe I.D. 30 mm
more
Soft hose
Insert
I.D. 15 mm
securely
Different
diameter joint
Fig. 2 Fig. 3
Accumulated
drain water
Air
Water
Waving
leakage
At least
50 mm
gap
Ditch
Good
Tilted Uneven Burred
Flaring tool
Copper pipe
Spare reamer
Pipe cutter
Clutch type
Smooth all
around
Copper pipe
Even length
all around
Fig. 6
No good
Fig. 2
Wing nut type
Fig. 4
Inside is shin-
ing without any
scratches.