ASYSTAT666B is a zone sensor not a thermostat. My suggestion is find a commercial technician that understands the unit you have and can explain control options for it.
We have Trane YCD120's on the roof and the original American Standard ASYSTAT666B thermostats are now failing with age (20+ years old) as the temps are running 3-4 degrees out and fluctuating therefore driving the zone balance between air & boiler base board crazy. I would like to replace the old Am Std thermos with Honeywell RTH 6360 series 5-2 programmable units as they technically seem as they would serve the purpose well and are a fraction of the cost of the overpriced Am Std thermos. Unfortunately our local small town America HVAC crew who we pulled in a couple months ago to troubleshoot & repair couldn't seem to grapple with the concept of failing thermostats so decided to take on the swap-out being a 40 year electro-mechanical tech myself.
I have installed one of the Honewells in a lesser needed zone as a pilot project and although following supplied instructions as best as can be understood can't get it to call for heat/energize blower.
Original Am Std wiring:
Commom=B,
Communication=W,
24vac=R,
Heat status (UCM in)=O,
Cool status (UCM in)=E,
System status (on/off)=G,
Service status (UCM input)=Y.
Nearest I can tell form the somewhat cryptic instux I have this should work but not doing the trick.....
Honeywell unit inputs used:
Y=Yellow,
G=Green,
C=Blue (transformer common),
O/B=Orange,
E=Brown,
W=White,
R=Red.
Where'd I go wrong? Anyone??
ASYSTAT666B is a zone sensor not a thermostat. My suggestion is find a commercial technician that understands the unit you have and can explain control options for it.
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This is not something that we can actually ride herd on over the internet, and in fact our site rules prohibit giving DIY guidance for the most part.
You need someone who understands this type of system, and you may have to bring them in from the next town over or the town after..... and frankly, it will be well worth your trouble and your expense to do so.
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2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
Member, IAEI
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I would highly suggest removing the thermostat you installed and put the old one back until a service technician arrives.
Those boards in that unit are very expensive.
“I haven’t failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison
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"In this house we obey the laws of thermodynamics" - Homer Simpson
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fraction of the cost of the overpriced Am Std thermos
Don't seem so Overpriced now!
R I P Icemeister
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Thank you for the advice,
I will bring in experienced help from a larger nearby locality.
Yeah,
I'm a veteran too and while serving in the 101st AB had to give plasma at one point to afford to feed my infant son that later served in the 82nd AB, 2 tours in Iraq...... In my mind, still over priced-
R I P Icemeister
Supporting our Vet’s
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I will also say thank you for your service....and I know that there are a lot of different MOS jobs in the armed forces and any of those guys can tell you how specialized the knowledge of their MOS will be. You might have one guy who works on rotor systems of helicopters, and you might have another guy who works on the turbine, and another for fire control systems.
HVAC is a lot like that. No one man can contain all of the skills in our field.
[Avatar photo from a Florida training accident. Everyone walked away.]
2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
Member, IAEI
AOP Forum Rules: