Installation Of Ducts - Toshiba MD-VNK802HEXE Service Manual

8

Installation of Ducts

CAUTION
Insulate the ducts to prevent condensation.
Inappropriate installation results in water leaking into the room and furniture may be damaged.
Suction duct length must be longer than 850 mm.
Installing ducts
1
Insert the duct into the duct connector, then fix the duct using aluminum tape to prevent air from
leaking.
2
Hang the duct from the ceiling so that excessive force is not applied to the unit.
3
Leave sufficient space between the room air discharge and the room air intake.
4
Install 2 ducts to the outside inclined downward between 1/100 and 1/50 so that water does not
enter the ducts.
Aluminium tape
Heat insulator
Duct
Duct connector
5
Insulate 2 ducts to the outside and the SA (supply air) using a heat insulator to prevent
condensation.
(Material of insulator: glass wool, 25 mm thick)
NOTE
• Refrain from the following duct installation works.
1) Excessive bending
• When metallic ducts pass through a wooden construction covered with a metal lath, wire lath, or metal plate, install
the ducts so that they are not electrically in contact with the metal parts of wooden construction.
• Keep the temperature in the ceiling cavity at 5 °C or more; otherwise, freezing and water leakage may occur due to
the built-in humidifier. (VNK type only)
• Even while the unit is not in operation, outside air may enter the room due to a pressure difference between the
outside air and inside air, or outside wind. Using an electric damper is recommended.
• Install a ventilator in the ceiling cavity when it is hot and the humidity is high.
• When the outdoor hood for the air intake is located near a window and small insects gather around the light, they may
get through the pipes and enter the room. Before installation, consider countermeasures such as setting up a filter
box (Locally procured).
• Arrange the pipes so that supply air and exhaust air are not mixed.
• When a vent cap or a round hood for an outdoor hood is used, do not attach the hood to a place where rain may fall
directly. In this case, using a rectangle hood is recommended.
• Stuff the cracks in the pipe penetration part with a noncombustible material such as mortar.
Unit
Slope
(1/100 to 1/50)
2) Multi-times bending
Heat insulator
(Insulates the adapter and the aluminium tape)
Outside air intake duct, Air discharge duct
Aluminium tape
3) Making the connecting duct
smaller
150
Installation Manual
Aluminium tape
4) Bending near the exhaust air
duct