Connecting Drain Piping - Mitsubishi Electric VL-250CZPVU-R-E Installation Manual

4.5 Connecting drain piping

CAUTION
Make sure to connect drain piping by the following
procedure to prevent freezing and dew condensation
forming on the surface of the piping
- Connect the drain piping on the indoor side of the insulation
layer
Insulate the drain piping up to the end of the piping
- Do not let the end of drain piping be immersed in the rain
gutter, etc.
(At times of heavy snow, the rain gutter freezes and
drain water is not discharged, which results in water
leaking from the product.).
This product has two drain pipes for EA and SA.
EA means Exhaust Air side, SA means Supply Air side.
EA drain pipe : Piping required
SA drain pipe : Depend on temperature and humidity, see
the following conditions.
R type
SA drain pipe EA drain pipe
connection connection
Indoor temperature (ºC) 25
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 40
Outdoor temperature (ºC)
L type
EA drain pipe SA drain pipe
connection connection
Piping require area
4.5.1 Connection method of drain hose (EA drain
pipe)
1) S ecurely connect the accessary drain hose to the root of
the connection port.
Securely fix the accessory hose band by tightening with
a flat head screwdriver. (Otherwise, water leakage can
result.)
2) C onnect one edge of the drain hose to the commercially
available drain pipe (Drain pipe for building: hard PVC pipe
(outside diameter: φ22)).
Securely fix the accessory hose band by tightening with a
flat head screwdriver.
3) C onnect the drain pipe so that it has at least three degree
of downward gradient from the lower part of the unit.
(Otherwise, water leakage can result.)
4) M ake sure to attach commercially available check valves.
For how to use, follow their instructions. (If not used
properly, water leakage can result.)
Space for withdrawing the control box
Note
- Do not adhere drain hoses with drain connection ports.
(Otherwise, maintenance cannot be performed.)
- Do not place the drain piping nearby the space for
withdrawing the control box. (If the control box cannot be
pulled out, product maintenance cannot be performed.)
4.5.2 Connection method of drain hose (SA drain
pipe)
1) E xtract the drain cap from the connection port of the SA
drain. The cap is fix with tape.
2) D o the piping following the same procedures as the EA
drain pipe.
Drain hoses are not included; contact your dealer or
contractor.
SA drain pipe
connection
Drain cap
Eng-15
Outside diameter
φ22 Drain pipe
(Field supply)
Check valve
(Field supply)
More than 3°
Drain hose fixture (Included)
Drain hose (Included)