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Off Topic - Any Home HVAC guys out there?  Dave Hardy
 Jan 01, 2004 12:51 PST 

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I have a York Diamond 80 Central HVAC System with a Heat Pump. My Mercury
type thermostat has decided to go kaput. It can keep the house at 60 or 85,
but it has trouble with anything in between. I decided to replace it with a
Programmable Digital Thermostat. This is all well and good except for since
it is a Heat Pump system the Thermostat is more complicated. My old one has
an "Emergency Heat" setting, but I'm not real sure what it does. It seems
to do exactly the same thing as "Heat" The Emergency Heat Indicator never
comes on, even when it is switched there. The previous owners told us to
switch it to Emergency Heat when the temp dips below 40, so we have blindly
followed those directions.

Anywho, I go to the Depot and one of the boxes says that if the old one has
"Emergency Heat" then I have a multi stage heat pump, and I need the ubber
expensive thermostat. Grrr. So I get the $100 thermostat and I come home
to install it. Reading through the directions, and looking at the old
thermostat though, I got a bit confused. The "E" terminal on the old
thermostat, for Emergency Relay, was not hooked up. I dig deeper, and on
the Timing Control Box (in between the Heater Unit and the Thermostat) the X
Terminal (Which according to the owners manual of the new thermostat is also
"emergency) is not hooked up to anything. This makes me wonder if I really
do have emergency heat, and if I really have a multi stage heat pump, and if
I need the $100 Thermostat.

Any insight?

Thanks,
Dave "Norm Abrams is a god" Hardy
89 SM
DILYSI Motorsports - Drive It Like You Stole It!


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