Using RO81 Solid State relay with Balltop

ChrisJ
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Posts: 2,499

Using RO81 Solid State relay with Balltop May 11, 2021 14:30:02 GMT ckfan likes this

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Post by ChrisJ on May 11, 2021 14:30:02 GMT

I didn't have time to test this yet and I do not know what effect if any it would have on the thermostat but I've found the RO81 to physically fit behind the control box right by the capillary tube for the thermostat.

Here's two poorly drawn wiring diagrams I doodled while thinking about what options I had.

The RO81 being used as an overload and as a start relay
On my control terminal 5 doesn't have a screw but is threaded for one so I would just move one of the unused screws over.

The RO81 being used only as an additional overload. The original start relay continues to operate.

Last Edit: May 11, 2021 14:32:37 GMT by ChrisJ

CA-2-A16 S/N 3326603 Porcelain cabinet with right hand door and capillary tube conversion. Restored and in use.
CA-2-B16 S/N 4126576 Painted cabinet with left hand door. Has bad float valve and needs paint.
CA-2-B16 S/N 41-944-942 Porcelain cabinet with right hand door. Has cracked liquid line, bad float valve and needs paint.
CK-2-B16 S/N 5320471 top only currently being restored

ChrisJ
Administrator

Posts: 2,499

Using RO81 Solid State relay with Balltop May 12, 2021 12:33:15 GMT ckfan likes this

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Post by ChrisJ on May 12, 2021 12:33:15 GMT

Here's my wiring for using the RO81 as an additional overload only. The original start relay is still functioning.
Green is my new run winding and the red is from the RO81 to supply power to the control.

The RO81 tucked behind the control box. When the unit is installed the RO81 will be laying on top of the capillary tube but it doesn't seem to matter.
Using the RO81's PTC relay may be a different story due to the extra heat. Perhaps some silicone tape or similar wrapped around the capillary tube may be in order or extending the wires and trying to locate the RO81 further from it.

Last Edit: May 12, 2021 15:20:47 GMT by ChrisJ

CA-2-A16 S/N 3326603 Porcelain cabinet with right hand door and capillary tube conversion. Restored and in use.
CA-2-B16 S/N 4126576 Painted cabinet with left hand door. Has bad float valve and needs paint.
CA-2-B16 S/N 41-944-942 Porcelain cabinet with right hand door. Has cracked liquid line, bad float valve and needs paint.
CK-2-B16 S/N 5320471 top only currently being restored

coldspaces 27 Cubic Foot Posts: 3,091	Using RO81 Solid State relay with Balltop May 13, 2021 3:50:03 GMT ChrisJ, ckfan, and 1 more like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by coldspaces on May 13, 2021 3:50:03 GMT You got lucky, that is a pretty clean looking CG control compared to the ones I have seen.
	I don't own too much old stuff,I just temporarily take care of it for its next owner. "Hell, there are no rules here--we're trying to accomplish something!" Thomas A. Edison We never really grow up, we just learn how to act in public.

Post by ChrisJ on May 11, 2021 14:30:02 GMT

Post by ChrisJ on May 12, 2021 12:33:15 GMT

Post by coldspaces on May 13, 2021 3:50:03 GMT