Honeywell RTH7500 thermostat problems - http://www.hvacmechanic.com/ Forums

Original message

JohnB!

71.191.55.115

"Honeywell RTH7500 thermostat problems" , posted Sun 20 Apr 00:29

I just replaced my Janitrol HPT18-60 thermostat for my heat pump with a RTH7500. My house is all electric, the heat pump does heating and a/c with an electric heat strip in the air handler for emergency heat. The air handler is inside the house, the compressor outside. I did the wiring according to the manual (red to R (which is also jumpered to Rc in the 7500), yellow to Y, green to G, orange to O, white to C, blue to E (and I also jumpered E to Aux)). The letter designations were the same on the Janitrol, except Aux was W2. For setup function 170, I selected 7, for a heat pump with aux heat. For function 190, I selected 0. The problem is that when I ask for cooling, the air fan starts but the air is not cool. If I change function 170 to 2 (heat pump with no aux heat), everything works fine. But I don't want to lose the ability to have aux heat. Any suggestions? Is this a faulty thermostat?

JohnB
Maryland

Replies:

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dwcaveney

69.104.140.120

"Re(1):Honeywell RTH7500 thermostat problems" , posted Sun 20 Apr 12:14

Set option 170=7, Set option 190=1. Then run furnace and
A/C. A/C probably still wont work. Then set option 190=0. Sometimes this procedure will reset R/V memory.

theduke03

24.250.18.179

"Re(1):Honeywell RTH7500 thermostat problems" , posted Sun 20 Apr 08:44:

You should verify your wiring by checking connections to air handler and outdoor unit. Then set to cool and wait 5 minutes. Then check if your outdoor unit is running. You may have a time delay in the stat or the outdoor unit, or both. If both you can dial down the one in the outdoor unit. If your stat displays "wait" then it is in time delay mode (5 minutes) to protect your comprerssor.

Some of the pictures displayed here are brought to you by Houston204. Be Safe.

[this message was edited by theduke03 on Sun 20 Apr 08:50]

rlj1117

75.183.152.109

"Re(1):Honeywell RTH7500 thermostat problems" , posted Sun 20 Apr 01:52

are you sure the blue wire should go to E , most of the time blue is common on goodman, i think the other wires are right but i would put blue on C and white on E .

Houston204

98.196.66.53

"Re(2):Honeywell RTH7500 thermostat problems" , posted Sun 20 Apr 10:49

"Tip of the Day" Remember to remove power first.

JohnB!

71.191.55.115

"Re(3):Honeywell RTH7500 thermostat problems" , posted Sun 20 Apr 16:47

Thanks for the suggestions. I set function 170 to 7 (heat pump with aux heat) and function 190 to 1 (for the compressor reversing valve). Everything seems to work ok, I'm going to leave it like that. Perhaps my reversing valve is the "energize to heat" type rather than the "energize to cool" type. I know that doesn't explain why it would work with function 170 set to 2 and function 190 to 0, but I won't argue with good results.

JohnB
Maryland

dwcaveney

68.124.71.75

"EDIT: My prior explanation wrong." , posted Tue 22 Apr 02:20:

I've seen that procedure work before. I don't fully understand why it works.
If you did not disconnect power prior to T-stat install, you could have double loaded option 170?
Because option 190 is a sigle DIP, I consider it the root directory as opposed to option 170, which is 10 DIP control.
It seems the procedure checks negative value and re-boots stat.

EDIT:
Above explanation probably wrong. Maybe Honeywell assumes 170=2 single, single is B (Blue) and 170=7 is O (Orange) like you said, energize to heat or energize to cool.

[this message was edited by dwcaveney on Wed 30 Apr 01:02]