| 摘要 |
PURPOSE:To make it possible to prevent a drop in the velocity of blowoff air and blast a blowoff air at a specified temperature by driving an indoor fan, opening a shut-off valve which shuts off a circulation air passage in an air duct portion on a blowoff side and allowing a blowoff air flow to circulate in an indoor unit without blasting the blowoff air at least from an air outlet, though a small amount of blowoff air is unavoidable. CONSTITUTION:A part of blowoff air flow from a horizontal fan 13 is introduced into an opened circulation air duct 16 by a guide which throttles the air duct with a side piece 17 on the base end without blowing off from an air outlet 7 while the indoor air flows back on the upper stream side of an indoor heat exchanger 11, passing through the circulation air duct 16, thereby partially circulating blast air. The blowoff air flows past the indoor heat exchanger 11 together with the indoor air blown from an air inlet 6 and heat- exchanges again at the indoor heat exchanger 11. This repeated heat exchange increases the temperature of hot air to produce high temperature. The hot air at a high temperature is blown indoors from the air outlet 7. |
