Midea DLFSDA Installation Instructions Manual page 9

INSTALLING DUCTWORK
Connect the return and supply ducts to the duct collars provided on the
unit. Adequate distance between the return and supply diffusers should be
maintained to avoid short circulation of air within the space.
The filter is located on the return side of the unit, on the rear or bottom
depending on the return air inlet arrangement.
Fig. 13 - Installing Duct
OUTSIDE AIR CONNECTION
If necessary, an outside air connection knockout is located on the side of
the unit downstream of the air filter. It is recommended to field supply and
field install a booster fan on the duct work used for outside air. A booster
fan may be powered by the connection on the PCB board CN43. The
maximum input for the motor is 200W. The output of the NEW FAN will
be active while the indoor fan is active.
NOTE: The amount of outside air is dependent on different factors as
the booster fan, outside air duct work type and length, static pressure,
conditions, etc..
Ø4.92" (125mm)
Fig. 14 - Outside Air Connection
CONDENSATE PIPE INSTALLATION
The unit is supplied with a 1 1/4−in. OD drain connection to connect
copper or PVC drain piping. When installing condensate piping, follow
these recommendations:
S
Install drains to meet local sanitation codes.
S
The Ducted Style Indoor unit is supplied with a condensate lift pump
that is capable of lifting water 29.5in. (750mm).
S
The highest point in the condensate piping should be as close to the
unit as possible (see Fig. 17).
S
Condensate piping should slope downward in the direction of
condensate flow, with a minimum gradient of 1/100.
S
When multiple units are connected to a common condensate drain,
ensure the drain is large enough to accommodate the volume of
condensate from all units. It is also recommended to have an air vent
in the condensate piping to prevent air lock.
32801000302
A150671
Ø6.3"(160mm)
Specifications subject to change without notice.
S
Condensate piping must not be installed where it may be exposed to
freezing temperatures.
S
To prevent the pipe from sagging, space hanging wires every
39−59in. (1−1.5m).
S
If the outlet of the drainpipe is higher than the body's pump joint,
provide a lift pipe for the exhaust outlet of the indoor unit. The lift
pipe must be installed no higher than 21.7in. (55cm) from the ceiling
board. The distance between the unit and the lift pipe must be less
than 7.9in (20cm). Incorrect installation could cause water to flow
back into the unit and flood.
S
To prevent air bubbles, keep the drain hose level or slightly tiled up
<3in. (75mm).
1. Cover the drain hose with heat insulation to prevent
condensation and leakage.
2. Attach the mouth of the drain hose to the unit's outlet pipe.
Sheath the mouth of the hose and clip it firmly with a pipe clasp
(see Fig. 15).
Drain hose
Drainpipe
Pipe clasp
connecting port
Fig. 15 - Indoor Drainpipe Installation
Fig. 16 - Condensate piping without a pump
Ceiling
Fig. 17 - Condensate piping with a pump
When connecting multiple drainpipes, install the pipes as illustrated on
Fig. 18.
0-53cm
(20.8")
≥10cm
(4")
Fig. 18 - Connecting Multiple Drain Pipes
Insulation
1-1.5m
<20cm
(39-59")
Lean over 1/50
(7.9")
0 - 75mm
(3")
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