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5515689 |
Defrosting heat pumps
Methods and apparatus for defrosting the outdoor coil in a variable speed heat pump system including determining, after the end of the last preceding defrosting, the optimal time to begin the next...
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5507154 |
Self-calibrating defrost controller
A self-calibrating defrost controller for use with heat pump. The outdoor heat exchanger coil of a heat pump is defrosted based upon either compressor run-time exceeding 6 hours, or the temperature...
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5479785 |
Electronic defrost controller with fan delay and drip time modes
An apparatus controls an appliance, the appliance including a compressor, a fan, and a heater. The apparatus includes a first switch for selectively coupling a first terminal with one of a second...
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5463875 |
Defrost control system
A defrost control system for use in domestic and/or industrial refrigerators. The system prevents formation of frost due to moisture of the air flow circulating over the evaporation cooling coil of...
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5421399 |
Cool/heat pump control circuit for a room air conditioner
A control circuit for a cool/heat pump in which two separate motors are utilized, each with a main winding and an auxiliary winding. A single dual rated capacitor is provided in series with both...
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5396777 |
Defrost controller
A method and apparatus to refrigerate air in a compartment wherein liquid CO 2 is delivered through a first primary heat exchanger such that sufficient heat is absorbed to evaporate the liquid...
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5396778 |
Thermostat capillary installation on a room air conditioner
Apparatus is provided for mounting a thermostat capillary in close proximity to the inside face of the indoor heat exchanger of a room air conditioner. The air conditioner includes a thermostat...
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5379608 |
Defrosting control unit for showcases
A defrosting control unit for providing centralized control of the defrosting a showcase having showcase units with defrosting devices includes an environmental informer ion signal generation...
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5345775 |
Refrigeration system detection assembly
A detection assembly is for a refrigeration system which has a cooling unit subject to frost build-up and defrost-to-drain. The assembly includes a first thermal sensor normally exposed to air but...
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5329781 |
Frost control system
A frost control system is described for inhibiting and removing frost from the door of a storage locker. Relatively cool air is received by an inlet to the frost control system at an inlet placed...
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5319943 |
Frost/defrost control system for heat pump
A microprocessor based control system for controlling frost accumulation on the outdoor evaporator coil of a heat pumping system during normal heat mode operations. A demand defrost concept is...
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5311927 |
Air conditioning and refrigeration apparatus utilizing a cryogen
A refrigeration system associated with a conditioned space to be controlled to a predetermined set point temperature via heating and cooling cycles. The refrigeration system includes a fluid flow...
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5305825 |
Air conditioning and refrigeration apparatus utilizing a cryogen
A refrigeration system associated with a conditioned space to be controlled to a predetermined set point temperature via heating and cooling cycles. The refrigeration system includes a fluid flow...
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5295361 |
Defrost recycle device
A defrost recycle apparatus and method for use with a temperature control system is provided. The temperature control system includes a heat transfer unit for removing heat from an enclosed space....
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5267450 |
Air conditioning apparatus
An air conditioning apparatus including an indoor device having a first heat exchanger, a second heat exchanger, and a radiant panel. Air circulation mode is switched to radiant mode when a room...
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5257506 |
Defrost control
A defrost cycle for a heat pump system which optimizes the efficiency of the heat pump by initiating defrost depending upon the relationship of both the outdoor coil ambient temperature and the...
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5251454 |
Defrost control apparatus and method for a refrigerating system
A thermistor is mounted between the fins of an evaporator. The thermistor senses the temperature about the evaporator when a blow fan mounted at the evaporator is driven and when it halts. The two...
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5231844 |
Defrost control method for refrigerator
A refrigerator is defrosted by comparing a sensed temperature in the refrigerator with a predetermined temperature when a defrost start time is reached. If the sensed temperature is too high, a...
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5179841 |
Heat reclamation from and adjustment of defrost cycle
A adjustable defrost cycle for a heat pump system which ensures that the outdoor coil is maintained free of frost by adjusting a defrost initiation reference level for the initiation of the next...
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5165249 |
Cool/heat pump room air conditioner control circuits
A control circuit for a cool/heat pump in which two separate motors are utilized, each with a main winding and an auxiliary winding. A single dual rated capacitor is provided in series with the...
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5156010 |
Defrost control method for a heat pump
A method of defrost for an outdoor side heat exchanger in a heat pump having a refrigeration circuit in which a compressor, an indoor side heat exchanger, an expansion device and the outdoor side...
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5150582 |
Multiple air conditioning apparatus
In multiple system type air conditioner, there are provided an auxiliary outdoor heat exchanger provided in an outdoor unit, and defrosting device that, on heating operation, periodically or as...
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5095711 |
Method and apparatus for enhancement of heat pump defrost
A heat pump is provided with a reversible fan motor in its outdoor coil and, after a delay period following initiation of the defrost cycle, the fan is caused to operate in a reverse direction to...
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5090209 |
Enthalpy control for CO2 refrigeration system
A method and apparatus to refrigerate air in a compartment wherein liquid CO2 is delivered through a first primary heat exchanger such that sufficient heat is absorbed to evaporate the liquid...
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5074120 |
Multi-type air-conditioning system with fast hot starting for heating operation
An outdoor unit includes at least a variable-capacity compressor and an outdoor heat exchanger coupled thereto. Each of a plurality of indoor units includes at least an indoor heat exchanger and a...
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5069039 |
Carbon dioxide refrigeration system
A method and apparatus to refrigerate air in a compartment wherein liquid dioxide is delivered through a first primary heat exchanger such that sufficient heat is absorbed to evaporate the liquid...
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5065593 |
Method for controlling indoor coil freeze-up of heat pumps and air conditioners
A heat pump diagnostic and control system for controlling indoor coil freeze-up when in the cooling mode is provided. A low indoor coil temperature is sensed, the indoor fan speed is increased in...
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5046324 |
Defrosting controller for refrigeration systems
A defrosting controller for use with a refrigeration system determines calculating a frost melting period from the measurements of the evaporator temperature during defrosting by means of an...
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5046323 |
Multi-system air conditioner
An air conditioner is disclosed which includes a unit for setting a defrost mode, as required, when the heating operation mode is determined, a unit for enabling the refrigerant which is delivered...
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5046325 |
Refrigerating circuit apparatus with two stage compressor and heat storage tank
A refrigerating circuit apparatus includes a two stage compressor having an upper stage compressing cylinder and a lower stage compressing cylinder, a heat stage tank, an upper stage side variable...
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5038575 |
Refrigerator with defrost override system
A refrigerator having an enclosed compartment for storing food to be cooled, an evaporator including a refrigerant flowing therethrough for cooling the food in the compartment, a defrosting device,...
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5031413 |
Low-temperature foods preserving case and its temperature control method
A low-temperature foods preserving case and a temperature control method therefor, in which a plurality of evaporators, each partitioned by partitioning panels, are arranged correctively in a...
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5003786 |
Refrigerating apparatus
A refrigerating apparatus is conventionally provided with an electric which is fed with an electric current to effect heating and defrosting operations, a defrosting control device including a...
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4993233 |
Demand defrost controller for refrigerated display cases
A demand defrost controller employs temperature measurements taken at the outlet of the discharge air curtain and the inlet of the air return to determine the need for defrost. If the difference...
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4989413 |
Method for controlling the defrosting of refrigerator-freezer units of varying degrees of frost accumulation
A method for controlling the defrosting of evaporators provided for refrigerator-freezer units which are cooled by a single compressor. The method includes the steps of forcedly resetting the...
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4974418 |
Heat pump defrosting operation
The present invention is a technique for a defrosting operation of a heat pump. External air provides the heat for defrosting the exterior heat exchanger by operating the exterior fan during times...
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4944158 |
Method of defrosting a refrigerating circuit for use in cooling a vehicular chamber
A method of defrosting a refrigerating circuit for use in cooling a vehicular chamber comprises two steps. In a first step a frost formed at an outer surface of an evaporator of a cooling unit is...
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4938027 |
Apparatus and method for defrosting refrigerator in vacation mode
Apparatus and method for defrosting a refrigerator in an operator actuated vacation mode wherein, after the operator actuation, the next defrost cycle is executed in accordance with the previously...
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4932217 |
Process for controlling a heater, in particular a defrost heater for refrigerating plants
In the case of a process for controlling a heater, in particular a defrost heater for a refrigerating plant which has a temperature sensor, which is connected to a system for cutting in and cutting...
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4928498 |
Method and device for compression of gases
The invention relates to a method and a device for compression of gases, in particular of air, within a compressed air piping system. The air drawn in for the compressor is cooled below 0° C....
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4916912 |
Heat pump with adaptive frost determination function
The present invention is an adaptive method and apparatus for detecting the formation of frost in a heat pump. The compressor cycle is interrupted and a defrosting operation is begun if the...
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4910966 |
Heat pump with single exterior temperature sensor
The present invention is a method and apparatus for determining the exterior ambient temperature in a heat pump. In accordance with the prior art the heat pump defrosts the exterior heat exchanger...
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4903500 |
Methods and apparatus for detecting the need to defrost an evaporator coil
Defrost control, and a method of determining the need for defrost, of a transport refrigeration system which includes an evaporator coil disposed in an air flow path which returns air from a served...
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4887436 |
Defrosting system for a heat exchanger
A defrosting system for a heat exchanger includes a temperature detector arranged adjacent to the exchanger, a temperature memory for storing temperature data detected by the detector, and a...
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4884414 |
Adaptive defrost system
A defrost system adapted for use with refrigeration or heat pump systems wherein an evaporator coil defrost cycle is adaptively modified in response to changing environmental conditions. Under...
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4882908 |
Demand defrost control method and apparatus
A demand defrost controller for a heat pump. The controller compares the temperature of an outdoor heat exchange coil with an enable temperature. A timer is activated when the coil temperature is...
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4852360 |
Heat pump control system
A control system for controlling a heating system having a heat pump and a source of supplemental heat. The indoor heat exchanger temperature is monitored, such as by a thermocouple or the like,...
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4850200 |
Refrigerating circuit device for air conditioning apparatus and control method thereof
When the temperature of an internal heat-exchanger decreases below a first value in cooling mode, a normal operation, wherein a variable capacity compressor operates in response to the temperature...
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4850204 |
Adaptive defrost system with ambient condition change detector
A defrost system adapted for use with refrigeration or heat pump systems wherein an evaporator coil defrost cycle is adaptively modified in response to changing environmental conditions. Under...
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4843833 |
Appliance control system
This invention relates to a system for the control of electrical apparatus with particular reference to control by electric sensors, and with special reference to a control system for domestic...
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