3.01-7: Kelvinator 1933 High Side Float Flow Control

HHCC Accession No. 2006.051HHCC Classification Code: 3.01-7

An early high side float control for household cabinet refrigerator, housed in refrigerant receiver and used for metering liquid refrigerant, through an insulated liquid line, into the evaporator, Model E1, Kelvinator of Canada, London Ont., Circa 1933. The high side float refrigerant metering system enjoyed a flurry of excitement in the mid 1930’s - easier to calibrate and more robust than its cousin, the low side float. Both would soon give way, however, to more compact automatic, less costly and more reliable expansion valve engineering, designed for cabinet refrigerator market. Ultimately with the advent of hermetic system refrigeration technology to calibrated capillary line, evaporator refrigerants flow control would come to prevail. [Rev. 08-03-20]

Image Gallery (3 Images)

3.01 Refrigerant Flow Controls - Household




Kelvinator of Canada, London, Ont



Serial No.:

4 round x 11 in h


4 lbs




Education, and research quality, illustrating the engineering design, construction, and operating principles, of high side float refrigerant flow control devices. These devices, employed for the metering refrigerant flow into cooling units in mechanically cooled household and small commercial refrigeration applications in Canada, where a brief blip in the history of refrigerant metering technology.

Patent Date/Number:

From York County (York Region) Ontario, once a rich agricultural hinterlands, attracting early settlement in the last years of the 18th century. Located on the north slopes of the Oak Ridges Moraine, within 20 miles of Toronto, the County would also attract early ex-urban development, to be come a wealthy market place for the emerging household and consumer technologies of the early and mid 20th century.

This artifact was discovered in the 1950’s in the used stock of T. H. Oliver, Refrigeration and Electric Sales and Service, Aurora, Ontario, an early worker in the field of agricultural, industrial and consumer technology.

Type and Design:

Liquid level float ball controlled

Special Features:

Liquid line valve moulded foam rubber insulated cover

Performance Characteristics:
Control and Regulation:
Targeted Market Segment:
Consumer Acceptance:
Market Price:
Technological Significance:

Typical of the technology of the period, a series of high side floats were developed and used in various applications by Kelvinator, principally in their household cabinet refrigerators in the mid and latter 1930’s - including their model series D and E float assemblies.
A brass float valve and needle seat assembly was located in the base of the refrigerant, liquid receiver, from where the liquid was metered into an insulated liquid line carrying it to the inlet of the evaporator. The float opens the valve at a predetermined level of refrigerant in the receiver, as it is returned from the high side of the compressor. The system is subject to critical refrigerant charge, much like the capillary tube device to follow. However maintaining the critical charge necessary for trouble free operation in open type condensing units, subject to compressor seal and other leaks was always a challenge.

Industrial Significance:

The high side float refrigerant meter system, used for flooded evaporators, was the source of some engineering interest and production in the mid 1930’s, but was then largely abandoned, along with the low side float, for the mainstream of household and small commercial refrigeration applications - for reasons of cost, reliability and serviceability and the engineering design constraints it introduced. By this time much simpler trouble free metering technology was at hand.

Socio-economic Significance:
Socio-cultural Significance:

It was a period in which machinery in the home was often not at all welcome, being viewed with the suspicion that comes with novelty. Machinery belonged on the farm and on the factory floor, but not in the Canadian home. Here it was considered noisy and hazardous, a potential threat to personal and private property. The mere notion of a self regulating, mechanical device that could be trusted to stop and start and self regulate itself reliably, over long periods of time was simply not part of popular experience of ordinary Canadians of the time. Thus, in addition to the immense array technical problems which remained to resolved, there was an equally large array of socio- cultural challenges to be over come by manufactures in convincing their public to be early adopters of refrigeration technology in the home - in the face of massive mistrust and apprehension. Conversely however, for those that were in a financial position of enjoying the many benefits of the technology, there were multiple factors tending to attract advocates and early adopters. Included were: the human need to be recognized as an early leader in adoption, the need for socio-economic status in the community, as well as the allure of new taste sensations, a break with the overwhelming, often desperate boredom of the daily dietary offerings of the period.


G. Leslie Oliver, The T. H. Oliver HVACR Collection

HHCC Storage Location:
Bibliographic References:

Kelvinator Service Manual, Domestic, Water cooler and beverage Cooler Section, January 1935, Kelvinator Corporation Detroit Mich.


See CMX02 and CMX04 exhibit catalogues, Item R9

Related posts