Residential HVAC tech has question

[HVAC/Stud]

I sometimes repair domestic refrigerators. The last one had a defective motor start relay. It is a klixon, the compressor motor is a induction start and induction run. No capacitors.

I went to an parts house and the counter help said we recomend to put a start capacitor in place of the relay. He said thats what all the appliance techs do, it's cheaper.

I like to allways go back with OEM parts. I would think the start winding maybe damaged by the start cap. I know the start winding are dropped out by the relay, and the start cap has a relay.

What do the refer techs say? Is it y'all policy to skip the relay and just put in a start cap?

Thanks,
STUD

[Six]

Some appliance motors use a centrifugal switch to drop out the start winding.

That said is is it any different putting a start relay on that motor than putting a hard start on a compressor ?

[HVAC/Stud]

I would think a PSC motor would be built with stronger windings and can handle a hard start.

A small HP IS/IR motor would not be built to handle a start cap.

The key is to drop out the start winding. My question is it normal for ref tech to use a hard start instead of OEM relay to take out start winding.


STUD

[76olds]

Back when I did work on res. refrigerators, I would normally use a Supco RO-81 or 41 to replace the start components. Other options were a IC-G1 relay and a RSC-10 (when the others wouldn't work).

Don't remember ever using oem relays.

[timebuilder]

When my PTCR decided to break into several small pieces on my home unit, I installed a 3 in 1, and it has worked great ever since.

[2sac]

When my PTCR decided to break into several small pieces on my home unit, I installed a 3 in 1, and it has worked great ever since.

this

[HVAC/Stud]

I don't put a start cap in when all you need is a relay.
Seems like a waste of a start cap.

I deal mostly with PSC motors, not induction start and induction run. Sometimes a shaded pole.

I was just wondering what refrigeration pro's do when relays fail.

STUD

[timebuilder]

I don't put a start cap in when all you need is a relay.
Seems like a waste of a start cap.

I deal mostly with PSC motors, not induction start and induction run. Sometimes a shaded pole.

I was just wondering what refrigeration pro's do when relays fail.

STUD

That's what "I" did. Because of what I know about this stuff, and how the refrigerator is designed. I also knew that the PTCR was a cheap production cop-out, when in reality, they should have used a potential relay.

Use the 3-in-1, and you're done.

[John Markl]

Use the 3-in-1, and you're done.

Yup

I used dozens of these while running service on ice merchandisers in the 80's and 90's....

Just one part to carry on your truck, no ordering, no waiting....

[HVAC/Stud]

Do you leave the external overload on. The start cap doesn't include a over temp safety. Its dropped out of the system.

If you remove O/L and install the start cap, where is your compress safety?

STUD

[John Markl]

Do you leave the external overload on. The start cap doesn't include a over temp safety. Its dropped out of the system.

If you remove O/L and install the start cap, where is your compress safety?

STUD

That's EXACTLY what I did, left the factory overload on there....

[timebuilder]

Do you leave the external overload on. The start cap doesn't include a over temp safety. Its dropped out of the system.

If you remove O/L and install the start cap, where is your compress safety?

STUD

The 3 in 1 has an overload.

[Phase8]

Can never go wrong with oem.

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