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replacing lennox thermostatic base plate (Q674L-1355) with a RTH7600

replacing lennox thermostatic base plate (Q674L-1355) with a RTH7600

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  #1  
Old 09-23-10, 11:39 AM
V
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Thumbs up replacing lennox thermostatic base plate (Q674L-1355) with a RTH7600

well after lots of research i could not find the info.

So i called honeywell at 1-800-468-1502 but they were close.
So i called them the next day, was on hold for 20 minutes for them to
find out the info for me.

here is the info.
I used the base plate # as there are several thermostats that used the same base plate.

here is the wireing info

old unit new unit

R goes to O/B
Y goes to E
M goes to Y
X goes to C
F goes to G
V goes to R or Rc ( there is a jumper there leave it )
L goes to L
A IS NOT USED ANY MORE

---------------------------------------------

on the old Thermostat
Vr was jumpered to V
E was not hooked up

---------------------------------------------

after installation

function 0170 was set to #7
function 0190 was set to #0
function 0270 was set to #9


hope this helps every one


thanks
Vistec
 
  #2  
Old 09-24-10, 01:02 PM
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replacing lennox thermostatic base plate (Q674L-1355) with a RTH7600

It seems honey well forgot one step

they just call me to inform me

i need to also put a jumper from E on the new unit to AUX

if not the aux heaters will not turn on

but every thing will still work

just will take longer to heat up the place
 
  #3  
Old 09-24-10, 04:50 PM
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R for reversing valve, F for fan, Lennox was a real rebel in their day

An example using common color codes (Which can vary)
 
 

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