Programmable Thermostat wiring question -rth7500
 

Happy New Year!

I'd like to ask for help with my Honewell RTH7500 thermostat.

I am replacing a White-Rogers 1F35-910 thermostat in my house. The
RTH7500 was suggested by Honeywell support. I have a gas boiler system
for heat.

The wiring on the white-rogers is to terminals R5, Y6 and 4. None of
the literature that I could find on the RTH7500 has these
terminals...they're either R, rc, rh, or y and y1...but no R5 and Y6.
I cannot find an association for the "4" either.

The informational page on the white-rogers can be found he
http://www.whiterogers.com/pdfs/cata...t_page_012.pdf

I tried searching the Honeywell site, but the online wiring assistance
doesn't include the newer models and when I called, their tech support
for homeowners is only available M-F 8-5?!

Can someone describe the wiring correlation between the WR model and
the rth7500?

Thank you,
Dave

wrote:
Happy New Year!

I'd like to ask for help with my Honeywell RTH7500 thermostat.

I am replacing a White-Rogers 1F35-910 thermostat in my house. The
RTH7500 was suggested by Honeywell support. I have a gas boiler
system for heat.

The wiring on the white-rogers is to terminals R5, Y6 and 4. None of
the literature that I could find on the RTH7500 has these
terminals...they're either R, rc, rh, or y and y1...but no R5 and Y6.
I cannot find an association for the "4" either.

HNY to you, too.

The 1F35-910 is an SPDT thermostat used for 3-wire Zone Valve Heat Only
applications.
http://www.white-rodgers.com/pdfs/in.../0037-1215.pdf
see page 1

The Honeywell stat should work fine.
http://hbctechlit.honeywell.com/tech...0s/69-1730.pdf
see page 18

4 = Call for Heat = W
5 = Hot side of transformer (power) = R
6 = Thermostat satisfied = Y

Don't forget to configure installer setting 0170 for the 3-wire zoned hot
water application.

Hope this helps.

Travis Jordan wrote:
wrote:
Happy New Year!

I'd like to ask for help with my Honeywell RTH7500 thermostat.

I am replacing a White-Rogers 1F35-910 thermostat in my house. The
RTH7500 was suggested by Honeywell support. I have a gas boiler
system for heat.

The wiring on the white-rogers is to terminals R5, Y6 and 4. None
of
the literature that I could find on the RTH7500 has these
terminals...they're either R, rc, rh, or y and y1...but no R5 and
Y6.
I cannot find an association for the "4" either.

HNY to you, too.

The 1F35-910 is an SPDT thermostat used for 3-wire Zone Valve Heat
Only
applications.
http://www.white-rodgers.com/pdfs/in.../0037-1215.pdf
see page 1

The Honeywell stat should work fine.
http://hbctechlit.honeywell.com/tech...0s/69-1730.pdf
see page 18

4 = Call for Heat = W
5 = Hot side of transformer (power) = R
6 = Thermostat satisfied = Y

Don't forget to configure installer setting 0170 for the 3-wire zoned
hot
water application.

Hope this helps.

Travis,
May I ask why Page 18 of the honeywell manual show that RH, 4, or V =
R, versus what you show as 4=W?

Thanks,
Dave

Travis Jordan wrote:
wrote:
May I ask why Page 18 of the honeywell manual show that RH, 4, or V
=
R, versus what you show as 4=W?

I noticed that too, Dave. All I can conclude is that some thermostat
manufacturer out there must use the 4 terminal to designate the
transformer
hot side. By looking at the WR schematic you'll see that on your
thermostat
terminal 4 is used to actuate the heat valve (the W terminal).

Wire it up and let us know how it works.

Travis,
Thank you, sir. It appears to be working and the house is still
standing :-)

I do have a question...when a terminal is designated "Y6," is that
terminal "Y" or "6" or is it considered a specific "Y6" value? Just
curious.

Again, Thank You for your assistance!

Dave