I have CT3500 thermostat. As it looks like you know a lot about
thermostats, would you know what "feature 37" is on this thermostat? This is
one of setable features on thermostat that defaults to 0 and I could not
find anywhere what it does.

Thanks


"David Efflandt" wrote in message
...
On Thu, 04 Nov 2004 21:11:05 GMT, Shrek wrote:
I have a hydro-air system and I need a few questions answered for the
correct
setup of the Ct3600 for my system

The system is a Oil Boiler (Weil-McLain) with hydro air (hot water pumped
to an
air handler coli which a fan blows over to deliver hot air thru the
house)

2 Questions:

For this type of system, what should the E-F switch be set to? According
to the
honeywell web site, it should be E, but they refer to this system as a
"Fan
Forced Hot Water" system. Is this the same as a Hydro-Air system?
This is the note on the Honeywell site :

"This type of system should place the E-F switch to the E position. This
means
that the fan will come on immediately with a call for heating because the
thermostat is controlling the fan. "

It depends whether the water stays warm and the thermostat controls the
fan (E), or if the thermostat controls the boiler, and the fan comes by
itself when the water gets warm (F).

Also, what should I set the System Type to? My options are

1 - Gravity or steam system
3 - Hot water, high efficiency furnace (90 % or better), or single stage
heat
pump
6 = Gas or oil forced air furnace
9 = Electric furnace

Those numbers actually refer to cycles per hour. A system that heats
quicker (water stays warm and just controls the fan), can use a higher
number (6). A system that takes awhile to heat up and/or radiates heat
longer would use a lower number (3).

I have a similar CT3500 on steam (5-1-1 instead of 7 day). I should have
gotten the CT3600 which can log how long your heating system runs, so you
can tell how effective setback is.