FREEZE PREVENTION DEVICE FOR VENTILATOR

摘要

A freeze prevention device for a ventilator is a ventilator (4) supplying low-temperature air, sucked in from a low-temperature air suction opening (1), through a heat exchanger (2) and discharging high-temperature air, sucked in from a high-temperature air suction opening (3), through the heat exchanger (2). A first opening (8) and a first damper (9) are arranged in a low-temperature air path (7) connecting from the low-temperature air suction opening (1) to the ventilator (4). A second opening (12) and a second damper (13) are arranged in a high-temperature air path (11) connecting from the ventilator (4) to a high-temperature air discharge opening (10). A bypass air path is provided, connecting from the first opening (8) to the second opening (12). Since, as above, the air paths are constructed such that high-temperature air having passed through a heat exchange element is again returned to the heat exchange element, icing can be melted in a short time.