Common maker wont work.


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Old 10-26-18, 06:40 PM
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Common maker wont work.

Honeywell RA89A relay controls a circulating pump.
This relay doesn't expose C wire. I soldered my own.

When i connect a thermostat directly to RED, WHITE, BLACK (common) everything works.

Using a FAST-STAT common it does not, what could be the reason?
I bypassed the thermostat wire, wired everything at the relay, don't see how it can be done any differently.



 
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Old 10-26-18, 06:52 PM
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Welcome to the forums.

You took that control apart and soldered a black wire to the relay/transformer junction ?
If yes..... you need to measure between that and each TT terminal. The T terminal that shows 24vAC is R and the other is W.
 
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Old 10-26-18, 07:33 PM
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I figured that out.
Reading the FAST-STAT troubleshooting guide, it says the transformer must be between 23 - 28v. Mine reads 22v and change, can that really be the problem?
 
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Old 10-26-18, 08:29 PM
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I have recommended them to people but as a pro..... I just run a new cable.
So.... I can't advise you if that voltage is a problem.

Actually..... I think your problem may be that the transformer in that control may not be large enough to run the relay and your stat. It may only be a 5va or possibly 10va transformer.
 
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Old 10-27-18, 06:31 PM
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I got an external transformer and everything is working
 
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Old 10-27-18, 07:54 PM
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Good job. Thanks for the update.
 
 

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