Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1988-12-27
1990-01-30
Bennet, Henry A.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
237 123A, G05D 2300
Patent
active
048968293
ABSTRACT:
In the air circulation system for thermostatic chamber, a plurality of circulation ports are provided in the thermostatic chamber near the door and an intake port is formed in the wall of the chamber opposite the door. A plurality of air shutters installed in air ducts are controlled to be opened and closed in response to the opening and closing of the door. Control of various components of the system is performed as follows. When the door is open, hot air is blown out from the circulation ports on one side of the chamber and then drawn into the circulation ports on the other side, thus forming a powerful air curtain at the door portion of the chamber. When the door is closed, the hot air is blown out from the circulation ports on both sides of the chamber into the thermostatic chamber and then drawn into the intake port. In this way the hot air is circulated to keep the interior of the chamber warm. Furthermore, when the door is open, the amount of fuel and combustion air supplied to the burner is increased to operate the burner at the maximum capacity, and at the same time the hot air circulation blower is powered up to deliver the maximum amount of hot air.
REFERENCES:
patent: 4613072 (1986-09-01), Kikuchi et al.
Bennet Henry A.
Isuzu Motors Limited
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