Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Honeywell Thermostat RTH 7500
Assumed all the wiring are correct,
to change from manual switching from heat to cool, press [system] button ( left ) to go into system setting.
then press and hold the [fan] middle button untill option display 120
use up down button to select option 300 ( Manual/Autochangeover) ,
select 0 for manual, 1 for automatic. ( read caution in page 22 of installation manual )
Posted on Oct 14, 2008
It is possible that it's the thermostat. When you turn it into cool mode, does the unit come on at all or is it silent? If nothing is coming on, then it's likely it's the tstat. Did the tech check the refrigerant charge while he was there? He should have checked it with the auxillary heat off and the unit just in heat mode. Make sure that the condenser unit outside is coming on when you are calling for cool, If you turn it on and everything comes on, go outside and put your hand on the large copper pipe coming into the unit. In cool mode, this pipe will be cold to the touch and in heat mode, the pipe will be warm to the touch. There isn't much you can do on your own with the exception of changing the tstat. If you can answer some of the questions I have posed, I can try and give you some more answers. Just remember that a check up doesn't mean its a guarantee that something won't happen the next day, it's just that everything was in working order at the time of the checkup.
Posted on Mar 21, 2009
Is the compressor running? is the outside unit clean and free from debris? does this unit work in the heating mode during the winter, and is it still capable of that now.
Posted on Jun 02, 2009
make sure the system switch is in the cool position, then press run program button and allow a couple of minutes for system to cycle on, if it doesn't come on press the button for lowering the set point, set it to 72 degrees and then press the hold temperature key.
Posted on Jul 26, 2009
RC & RH JUMP WITH R FROM AH & CU
C/U - A/H - T
R - R - R = 24V
C - C - C = COMMON
Y - - - Y = COOLING
G - G = FAN
B O\B = REVERSING VALVE - HEAT
make sure the stat is set up for heat pump
Not sure what b or d are. i would double check the schematic on the condenser for the reversing valve wire.
Posted on Dec 16, 2009
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