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Found belt broken causing y2 to call and bring on mechanical. Thinking about adding an outdoor lockout to stop mechanical cooling from coming on as the compressor were a huge block if ice
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 Originally Posted by HVACTECHND
Found belt broken causing y2 to call and bring on mechanical. Thinking about adding an outdoor lockout to stop mechanical cooling from coming on as the compressor were a huge block if ice
Many units use a low pressure safety, too.
[Avatar photo from a Florida training accident. Everyone walked away.]
2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
Member, IAEI
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 Originally Posted by timebuilder
That is possible. A lot of guys have no interest in learning how an economizer works, or how to troubleshoot it.
So true. Economizers have kept me very busy during the winter over the years. On many new accounts I often find enthalpy sensors disconnected with nothing else wrong. I tell young guys to learn about them because they generate work for the cold months when some get slow. I urge guys to not look at the controller and get overwhelmed. I tell them to break each circuit down and things get much less complicated. That is of course once they get an understanding of them
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 Originally Posted by Dchappa21
Or a freeze stat.
That was my initial thought . .
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 Originally Posted by Dchappa21
Or a freeze stat.
Also a good idea to have that in the chain. We also install a low ambient control for those Y2 calls on cooler days.
[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:
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Economizer would disable 1st stage mechanical cooling if outdoor conditions were suitable (sounds like they are) for free cooling. Suction line freeze stat on 2nd stage compressor or Low ambient thermostat for 2nd stage lockout. These units are not designed to protect the compressors from ANY unit malfunction.
Last edited by Cold shot; 12-31-2012 at 06:15 PM.
Reason: incorrectly described the product that was being talked about.
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I can't say that I know of any design that "protects the compressors from any unit malfunction....."
[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:
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True, but there are several things that can be added. Air proving switch, freeze stat, low & high pressure switches, discharge line thermostats, phase monitors. All to protect the compressor.
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 Originally Posted by Cold shot
True, but there are several things that can be added. Air proving switch, freeze stat, low & high pressure switches, discharge line thermostats, phase monitors. All to protect the compressor.
I'll go with that. You can protect the compressors from SOME malfunctions.
[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:
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 Originally Posted by Cold shot
Economizer would disable 1st stage mechanical cooling if outdoor conditions were suitable (sounds like they are) for free cooling. Suction line freeze stat on 2nd stage compressor or Low ambient thermostat for 2nd stage lockout. These units are not designed to protect the compressors from ANY unit malfunction.
Just to prevent any confusion, when second stage cooling is energized while a system is economizing, first stage compressor energizes and comes on (compressor 1 and not compressor 2)
## + years in the field never made you a know-it-all This industry is far more diverse than you are
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I always shake my head when I see a economizer installed but never hooked up.
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