Drain Piping Work; Confirming Drain Discharge; Duct Work - Mitsubishi Electric CITY MULTI PEFY-P-NMHU-E2 Installation Manual
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7.2. Drain piping work
• Observe the following precautions when installing drain piping.
• Make sure the drain piping has a downward slope of at least 1:100.
• To prevent the heat exchanger from being corroded and foul odor from being
emitted, do not place drain pipes in a drainage channel where sulfuric gas is
generated.
• Install drain piping so that there are no leaks from piping connections.
• Adequately insulate the pipes to prevent condensation water from dripping.
- When running a drain hose in a ceiling where it is high in temperature and
humidity (dew-point temperature of 26 °C [79 °F] or higher) and operating
the units for a long time at a time, condensation may form on the drain
hose. Insulate the drain hose or take other appropriate measures to pre-
vent condensation water from dripping.
• Insulate the drain pipe that runs through a room with commercially available
insulator (polyethylene foam with specific gravity of 0.03 and a minimum
thickness of 10 mm [7/16 in]).
1 When installing a unit on the top floor or in a high-temperature high-
humidity environment, use an insulator with greater thickness than what
is specified above.
2 Follow the specifications specified by your client, if any.
• At the completion of installation, visually check that drain water is properly
drained by looking through the sight glass on the unit and checking the exit
of the drain pipe.
Precautions for drain piping installation
• Make sure the drain piping has a downward slope of at least 1:100 (drainage
side down).
• Insulate the drain pipe with a commercially available insulator.
• The horizontal run of drain piping must be 20 m [65 ft] or shorter.
(If the pipe run is long, install pipe supports to keep the piping from twisting.)
Don'ts
• Do not install an air vent. (Drain water may spew out.)
• Do not make an upward run or a trap in the piping.
Centralized drainage system
• Approximately 10 cm [3-15/16 in] below the drain water outlet.
• Use a VP30 pipe, and provide a downward slope of at least 1:100.
[Fig. 7.2.1] (P.3)
Correct piping
Wrong piping
A Insulation (9 mm [3/8 in] or more)
B Downward slope (1/100 or more)
C Support metal
K Air bleeder
L Raised
M Odor trap
Grouped piping
D O. D. ø32 mm [1-1/4 in] PVC TUBE
E Make it as large as possible. About 10 cm [3-15/16 in].
F Indoor unit
G Make the piping size large for grouped piping.
H Downward slope (1/100 or more)
I O. D. ø38 mm [1-1/2 in] PVC TUBE for grouped piping.
(9 mm [3/8 in] or more insulation)
J Up to 700 mm [21-9/16 in]
N Drain socket (accessory)
O Horizontal or slightly upgradient
1. Insert the drain hose (accessory) into the drain port (insertion margin: 25 mm
[1 in]).
(The drain hose must not be bent more than 45° to prevent the hose from
breaking or clogging.)
(Attach the hose with glue for the hard vinyl chloride pipe, and fix it with the
band (small, accessory).)
8. Duct work
• When connecting ducts, insert a canvas duct between the main body and the
duct.
• Use non-combustible duct components.
• Install sufficient thermal insulation to prevent condensation forming on air
inlet and air outlet duct flanges, and air outlet ducts.
[Fig. 8.0.1] (P.4)
A Air inlet
C Duct
E Access door
G Ensure sufficient length to prevent short cycling
H Air outlet
B Air filter (supplied at site)
D Canvas duct
F Ceiling
2. Attach the drain pipe (O.D. ø32 PVC TUBE, field supply).
(Attach the pipe with glue for the hard vinyl chloride pipe, and fix it with the
band (small, accessory).)
3. Perform insulation work on the drain pipe (O.D. ø32 PVC TUBE) and on the
socket (including elbow).
4. Check the drainage. (Refer to [Fig. 7.3.1])
5. Attach the insulating material (accessory), and fix it with the band (large, ac-
cessory) to insulate the drain port.
[Fig. 7.2.2] (P.3)
A Indoor unit
B Tie band (large) (accessory)
C Visible part
D Insertion margin
E Drain socket (accessory)
F Drain pipe (O.D. ø32 mm [1-1/4 in] PVC TUBE, field supply)
G Insulating material (field supply)
H Tie band (small) (accessory)
7.3. Confirming drain discharge
u Make sure that the drain-up mechanism operates normally for dis-
charge and that there is no water leakage from the connections.
• Be sure to confirm the above in a period of heating operation.
• Be sure to confirm the above before ceiling work is done in the case of a new
construction.
1. Remove the maintenance panel.
2. Pour 1000 cc of clean water into the drain pan.
Note: If using a pump to supply water, adjust the water flow rate to 0.4 L/min
or slower by adjusting the valve. Supplying water at a faster rate may
cause water leakage from indoor units or damage the drain pump.
3. Operate the units in the emergency mode, add clean water as necessary,
and check for proper drain water drainage through the drain water sight
glass.
To operate the units in the emergency mode, disconnect the connector from
the OFF side of SWE on the control board in the control box. Then, connect
it to the ON side to supply power and simultaneously operate the drain pump
and the fan.
SWE
OFF
ON
At the completion of work, be sure to place the connector back to its original
position.
Note: Before covering the sight glass on the drain port with an insulator,
flash a light on it to check for proper drainage.
4. When done, be sure to place the connector on SWE back to its original (OFF)
position, and place the maintenance panel back on.
SWE
OFF
ON
•
After removing the insulator to check the drain water through the sight
glass, replace the insulator.
[Fig. 7.3.1] (P.3)
A Insert pump's end 2 to 4 cm [13/16-1-5/8 in].
B Maintenance panel
C About 1000 cc
D Water
E Filling port
Caution:
Inlet duct is 850 mm [33-1/2 in] or more necessary to construct.
Always install horizontal.
SWE
OFF
ON
SWE
OFF
ON
9
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