I have just installed a Hunter programmable thermostat which operates
by a battery. While this inexpensive unit works beautifully, I am
curious, just in case the thermostat breaks or run out of power (let's
assume I have no backup battery in my home) in the midst of a show
storm in Feburary, is there a way I can wire something up to turn on
the furnance and get heat instantly ?
I remember seeing the following wire connections (please correct me if
I remember incorrectly) :
Can I jump any two of these terminals and gets heat ? For your info I
live in a new house which has a electronic ignition furnance and a
central a/c unit.
Thanks in advance for a knowledgable answer.
Yes. As long as your furnace has power, you can "go manual" by jumping
two of those wires.
Sorry, I'm not going to drag out the manual on my Hunter to find out which
two. I just have a basic high efficiency furnace.
FWIW: my inexpensive Hunter works much better than my expensive, fancy
Honeywell. The expensive Honeywell couldn't be adjusted to compensate for
the lag the high efficiency and electronic ignition brings to the furnace
cycle. The Honeywell had some bells and whistles which ended up oftentimes
shutting the furnace down after 30 seconds of operation. I couldn't adjust
it to delay it's pre-act control to compensate for the no-heat while the
high efficiency and electronic ignifition was doing its thing, i.e.. . .30
second of fan-no attempt to ignite. . . then spark. . . then heating the
pilot light safety bulb . . then finally lighting off the furnace.
Could it be that you don't know WTF you are doing when trying to correctly
program the Honewell??
Could it be that you didn't do the installer set-up programing on the
<< That would mean actually having to read the instructions, OMG noone does
that unless all else fails.
I'm a compulsive instruction-reader. Nevertheless, I can understand people who
aren't--a lot of instruction booklets must have been farmed out to nations who
have a grasp--but a desperate, slipping grasp--on English as a second language.
Either that, or a lot of the people who write booklets dozed through English
THen you had something programmed wrong...but wait..thats right..the full
instruction manuals are not always in with the consumer line of Honeywell
For the record, when some cheapo asks me for a thermostat, we keep about 5
LuxPros on the vans....we GIVE them away...they suck that bad. We also tell
them when they are ready for a real stat, the Honeywell will be cheaper than
the one that HD sells, INSTALLED. and programmed correctly.
BTW...those stats we keep on the truck....they rotate...about every 4 weeks
or so, all the originals are back on it..with Honeywells or Robertshaws in
To the OP, your post originally sounded like you mean no power, therefore,
Pauls reply to you sounded right.
However, IF you have it wired right, and since no one on the internet can
tell, all we can tell you is that RC and RH in a single transformer system
will be jumpered together, and W, will work....but, you will have no way of
controlling the temp, and for that one reason alone, it would have been
smarter to spend the extra $10 on a Robertshaw....since they can be had for
about $40..digital, and no need for backup battery.
this is Turtle.
The reason you have a time setting on the hunter thermostat is the hunter
thermostat are 90% sold to home owners and don't know how to set the time in
the gas furnaces but can read the hunter instruction to set the time with
the thermostat. The reason the Honeywell thermostat does not put it in the
thermostat is honeywell mostly is sold to professional hvac people and they
know how to set time in the furnace and don't need a second timing setting
in the thermostat. I personally don't like time setting in the thermostat
for it is setting the time with the thermostat and then still has to wait
for the furnace timing system to start , too. When your running two timing
system on a furnace. Your odds are great that one will burn the other one
out and neither will work. If your going to use the timing on the
thermostat. you need to go in the furnace and turn the timing system off and
not have two systems fighting each other. Personally i like the 120 second
The problem you described is the two systems fighting each other. If you got
it to work , you got one of them taking control and over riding the other.
Now if the furnace timing system is the one your over riding. your odds are
good in the next 5 to 10 years the timing system of the furnace may fail and
it so it will shut everything down till you change the control board.
From the side lines this thread is actually kind of humourous. :)
Actually, I have seen these, but they're insanely expensive so the
thought that the OP has one setup was dismissed. I have actually seen an
'off-grid' (solar, wind + backup generator) system first hand, and they're a
damn cool idea. A very expensive idea, but cool none-the-less. :)
To be honast, I thought the same thing on first read, but then I thought
that no one would be dumb enough to think thier furnace would run without
electricity. Then again, after reading some of the post on a.h.r. I should
know better by now.. :)
It's all the gas, oil, solvent, and refrigerant fumes... it fries the
brains.. :) Plumbers are the same way, sniffing ABS solvents all day. :)
(this is a joke)
Frankly, I'm beginning to think that the OP was in fact a very clever
troll. He posted to alt.hvac, a group known to roast those who admit
they've installed store-bought stats, and even stated he was worried it
might break, just to start the fire.
You could play with the wiring and get the furnace to turn on, but isn't it
much easier to keep several spare batteries in the refrigerator so you don't
ever have a condition where the thermostat is out of power? Now if it does
break, then spare batteries won't help. In that case, what about the old
thermostat that the Hunter replaced? Hook it back up and forget about the
programmable unit until you can get a replacement. While you will have to
set the temp back manually at night and higher during the day, at least it's
properly controlling the furnace and you'll be comfortable.
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