Title:
ENVIRONMENTAL TESTING DEVICE HAVING DEHUMIDIFYING MACHINE OF NON-FROST OPERATION CHANGING-OVER TYPE
Document Type and Number:
Japanese Patent JP3046761
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To expand a range of continuous operation during an operation of a dehumidifying machine.
SOLUTION: When an electromagnetic valve 35 is closed, an evaporating pressure of refrigerant at an upstream side is adjusted to a higher pressure by an evaporating pressure adjusting valve 36 so as to prevent an evaporator from being frosted. An ON/OFF signal for a dehumidifying machine together with a set value such as a temperature or a humidity is inputted to a discriminating part 41 of a non-frost operation control part 4. When the dehumidifying machine is turned off, the electromagnetic valve 35 is closed at an output part 42 only when a point P of the set value is placed within a first range A so as to perform a non-frost operation. However, when the dehumidifying machine is turned on, it is changed over in such a way that its non-frost operation can be carried out even if the setting point P is in a second range B. Accordingly, in the case that the dehumidifying machine is turned on, a non-frost operation state is also set in a second range B, so that it is possible to expand a continuous operation range without attaining any defrosting. In this case, although a dehumidifying capability with a freezer is low, a low temperature operating condition is fulfilled by a dehumidifying capability of the dehumidifying machine.
Inventors:
Masakatsu Ueda
Takehaku Sanmura
Takehaku Sanmura
Application Number:
JP33271595A
Publication Date:
May 29, 2000
Filing Date:
November 27, 1995
Export Citation:
Assignee:
Tabai Espec Co., Ltd.
International Classes:
F24F11/02; F25B1/00; F25B47/02; F25B41/04; F25D21/04; (IPC1-7): F25B47/02; F24F11/02; F25B1/00
Domestic Patent References:
| JP54111848U | ||||
| JP6319134U | ||||
| JP538471Y2 |
Attorney, Agent or Firm:
Kenji Kageyama