Drainage Piping Work - Mitsubishi Electric City Multi PMFY-P NBMU-E Série Manuel D'installation

4. Drainage piping work

Max. 65ft.(20m)
2.5 to 5ft.(0.75–1.5m)
Fig. 4-1
Max. 6in.(15cm)
Fig. 4-2
1-7/16
1-5/16
(33) (37)
Fig. 4-3
Fig. 4-4
Ceiling panel
Max. 23-5/8 in. (60 cm)
Position of drain outlet
Make as short as possible (Max. 6 in. (15 cm))
Make as small as possible
Downward slope (1/100 or more)
Make as great as possible (Min. 4 in. (10 cm))
Drainage pipe vertical section
Water bottle (procure locally)
Fig. 4-5
in. (mm)
4.1. Drainage piping work
• Use O.D. ø1"(ø26) PVC TUBE for drain piping and provide 1/100 or more
downward slope.
• Be sure to connect the piping joints using adhesive of polyvinyl chloride
family.
• Observe the fi gure for piping work.
• Use attached drain hose to change the pipe extraction direction. (Fig. 4-1)
Correct piping
1
Wrong piping
2
Insulation (3/8 in. (9 mm) or more)
A
Downward slope (1/100 or more)
B
Support metal
C
Air bleeder
K
Raised
L
Odor trap
M
Make as little as possible
N
Make as great as possible (approx. 4 in. (10 cm))
O
Grouped piping (Fig. 4-2)
VP20 (O.D. ø1" (ø26) PVC TUBE)
D
Make it as large as possible
E
Indoor unit
F
Make the piping size large for grouped piping.
G
Downward slope (1/100 or more)
H
O.D. ø1-1/2" (ø38) PVC TUBE for grouped piping.
I
(3/8 in. (9 mm) or more insulation)
Up to 19-11/16 in. (50 cm)
J
1.Connect the drain socket (supplied with the unit) to the drain port. (Fig. 4-3)
(Fix the tube using PVC adhesive then secure it with a band.)
2.Install a locally purchased drain pipe (PVC pipe, O.D. ø1"(ø26)).
(Fix the pipe using PVC adhesive then secure it with a band.)
3.Insulate the pipe. (PVC pipe, O.D. ø1"(ø26))
4.Check that drain fl ows smoothly.
5.Insulate the drain port and drain socket with insulating material 9 , then secure
the material with a band. (Both insulating material and band are supplied with
the unit.) (Fig. 4-4)
[Fig. 4-3]
Unit
A
Insulating material
B 9
Band (long)
C 4
Drain port (transparent)
D
Insertion margin
E
Matching
F
Drain pipe (O.D. ø26 PVC TUBE)
G
Insulating material (purchased locally)
H
O.D. ø26 PVC TUBE (Slope 1/100 or more)
I
Band (middle)
J 4
Drain socket
K
[Fig. 4-4]
Drain port sectional view
A
Band (long)
B 4
Insulating material wrapping starting position (Top side)
C
Insulating material
D 9
Ceiling panel
E
In cases of upward drainage
• The largest dimension possible for the vertical section at
from the lower surface of the ceiling. Make this vertical section as short as pos-
sible.
Water drainage check
1. Fill the drainage pan with about 1/8 gal. (0.5 liters) of water. (Do not pour water
directly into the drain pump.)
2. Make a test run of the unit (in Cooling mode).
3. Check for water drainage at the transparent check window and the outlet of the
drainage pipe.
4. Stop the test run. (Don't forget to turn off the power.) (Fig. 4-5)
is 23-5/8 in (60 cm)
B
7