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I can't get power to a pump from the honeywell R8845U

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Posted on Oct 22, 2008

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How do I replace an old White Rodgers thermostat with new honeywell TH5220


The Orange wire for the reversing valve and used with a Heat Pump
If you have a heat pump, then yes. If you have a gas furnace then no. If you have a HP and the reversing valve is not connected, then you might just be using the emergency electric heat strips. :-o

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Honeywell wiring diagrams


WE R GOING FROM A HONEYWELL TAYSTAT500 THERMSTAT (HEAT PUMP) TO A NEW HONEYWELL to (WHOLE NEWHEATING/AIR CONDITIONER) WITH A HONEYWELL RTH8580WF1007 THERMOSTAT? WHERE WOULD THE C WIRE BE. WE DO NOT HAVE A WIRING SCHEMATIC FOR THE OLF THERMOSTAT. IT HAS 7 WIRES. HELP?

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Wiring a thermostat


Are you changing out thermostat? If so you must turn off power to your furnace or air handler. You should mark or write down each color and what terminal it was removed from. example= red from term r=green from term.=g yellow from y... Be careful, some thermostats are wired different according to type of system you have. Heat pumps are different than straight cools and the thermostats sometimes have setting or little switches. Honeywells have installer set up guides in package. Read it carefully

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1 Answer

Label describing switch positions missing


when you remove the cover of the heat pump stat there used to be operating instructions on the inside of the cover.

Apr 15, 2010 | Honeywell Air Conditioners

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Heat pump -> installing digital thermostat.


sounds like the thermostat is not energizing the reversing solenoid , unless you have some experience with electrics i recommend that you call a trades person, to check this problem a multi meter is required and requires the user to know how to work with power , please do not attempt it yourself ...

May 10, 2009 | Air Conditioners

3 Answers

Hunter 44100A programmable thermostat


Yes you will need the orange (o) wire for the reversing valve in your heat pump. T-stat color code is red (r) for 24v power from transformer. Blue (x or c) is the common or the other 24v power from transformer and this will power your programmable t-stat. Orange is for the reversing valve that will switch your heat pump from cooling and heating. Green (g) controls your inside blower. Yellow (y) brings on your outside unit. White is your backup heat.

Sep 28, 2008 | Air Conditioners

1 Answer

Replace Carrier tstatccshp01 builders standard thermostat with Honeywell rth7500 series and wiring not matching Does O wire go to Aux..? fan working but no cool air.


No... Aux. is auxiliary heat strip. This is usually a white or black wire its up to the choice of the installers preferance. O or orange wire. is used to the reversing valve on a heat pump. If you do have a heat pump there is a programing section inside the Honeywell t-stat. which should say heat pump or straight cool, then another section that will ask if you want the reversing valve to energize in heat or cool. most Heat Pump brands energize in cool the exception is Rheem and Ruud they energize in heat.

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