Re: Why do a/c thermostats have 5 wires?

Aaron Fude wrote:

> On Jul 18, 4:07 pm, Rick-Meister <Rick-meis...@[EMAIL PROTECTED]
> wrote:
> 
>>Some systems use two transformers and thus two "hots." RH for heating,
>>RC for cooling. If the system only has one transformer, the thermostat
>>has a jumper to go between RH and RC.
>>
>>So, to get to five wires you'd have
>>
>>RH Hot for heat
>>RC Hot for cooling
>>Yellow for compressor
>>White for heat
>>Black for common (to power the clock and electronics in a setback T
>>stat
> 
> 
> 
> Actually, my thermostat is strictly for cooling and it still has five
> wires. Thus my question.
> 
> Thanks.

Hot, common, fan, cool makes four.  Perhaps the fifth isn't really
functional.  What are the terminals to which they're connected labeled?

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