Duct Work - Toshiba MMD-AP0481HFE Service Manual

5

DUCT WORK

Be sure to apply heat insulation to the duct to prevent dewy condition.
If there is an incomplete duct work, the water leakage into the room may happen.
• In order to prevent short circuits, design the duct work so that the intake and discharge openings are not
adjacent to each other.
• If no air filter is installed, dust will collect in the heat exchanger, which may cause the air conditioner to fail or
to leak. (Local procure)
• Set a filter chamber at air inlet side of the unit.
For a filter chamber, select an air filter with 50% or more (by weighing method) of dust collection efficiency.
• Be sure to set the duct at air inlet side with descending inclination because the suction duct of the this unit is
exposed to outdoors and therefore rainwater, leaves and birds are easy to enter in if it is set horizontally.
Attaching wire netting and others to end of the suction duct is also recommended.
• Connect the duct so that the air inlet sucks fresh air only.
Be sure to apply heat insulation for the duct to prevent dewing.
(Recommended material: Glass wool or foam polyethylene, Thickness: 25mm)
• When welding the duct at the site, sparks may enter in the air filter or thermal insulator.
To avoid spread of the fire, cover the duct with iron plate, etc.
• When penetrating metal lath, wire lath or metal plank with the metal duct, isolate the duct from the wall
electrically.
• Set the canvas ducts at air inlet port and air supply port. It is to avoid conveyance of vibration, abnormal
resonance sound and also to make easy the disassembly of the main unit in service time.
• Connect the ducts so that the ducts do not weight on the main unit.
If connecting the ducts directly to the main unit, the duct vibration abnormal sound from the main unit may
happen, and also the filter and service panel cannot be detached.
• Be sure to fix the ducts by using the hanging bolts.
<Overview of duct connection>
NOTE : Parts except the fresh air intake indoor unit are to be locally procured.
Canvas joint
Air inlet
Duct Work
• After installing the product, perform the duct work according to the working diagram.
REQUIREMENT
Canvas joint
Fresh air intake
indoor unit
Check port
CAUTION
Thermal insulator
(Accessory)
– 28 –
Hanging bracket