new thermostat question - http://www.hvacmechanic.com/ Forums

Original message

crazz13

67.140.204.39

"new thermostat question" , posted Wed 21 May 10:16

I am changing out my old TRANE BAYSTAT 239 with a HONEYWELL RTH230B.

THE OLD WIREING

X2= BROWN
O= ORANGE
G= GREEN
Y= YELLOW
T= BLACK
R= RED
W= WHITE
U= EMPTY
F= EMPTY
B= BLUE

THE NEW ONE IS

Rh=
Rc=
W=
Y=
G=

AND THATS IT. I DON'T KNOW WHAT TO PUT WHERE.

Replies:

learner

70.73.177.71

"Re(1):new thermostat question" , posted Wed 21 May 10:47

Hi,
Your new one is wrong one for your system. Move upto higher model
to meet the requirement. Houston the good guy here will give you a GOOD advice. Wait until he shows up.

crazz13

67.140.204.39

"Re(2):new thermostat question" , posted Wed 21 May 10:59

well thats 40 bucks in the pisser. Thanks though. I will wait for Houston.

theduke03

24.250.18.179

"Re(3):new thermostat question" , posted Wed 21 May 18:42:

First you need a heat pump thermostat, for 2 stage for heat, 1 stage cool.. If you want a head start you should get this while you're waiting. Houston would recommend a Honeywell Visionpro and I agree but any 24 volt, 2 heat-1 cool heat pump stat will do. Vision pro:

"My dad was the most feared furnace fighter in Northern Indiana."

[this message was edited by theduke03 on Wed 21 May 18:46]

Houston204

98.196.66.53

"Re(4):new thermostat question" , posted Wed 21 May 20:04

In my opinion, The Honeywell Visionpro TH8321 and TH8320 are the best stats available today. I have one on my house and it's great. A bit pricey though..

The Honeywell RTH3100C is a non programmable stat compatible with your system.

The Honeywell RTH7400 and RTH7500 (with autochangeover) are programmable stats compatible with your system.
Option 170 = 7 (multistage heatpump)
option 190 = 0 (O/B terminal is O)
option 240 = 9

Your old B is C (common).
Tape off the wire that went to T (usually brown but it appears that yours is black).

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