Giving further info here.......
Ive recently re-configured a taystat 103A to "unrestricted mode" but also I
added an outdoors stat in order to break the connection from the "W"
terminal coming from the honeywell chronotherm III--( effectively locking
out propane furnace operation until low os ambient is satisfied )
Now wanting to eliminate completely the possibility of ever having the
outdoors stat inadvertanly start the the compressor where the heat pump had
just immediatly been cycled off by said taystat kit.
Given, some hysteresous (sp) will exist in the outdoors stat, ( which would
ordinarilay protect the compressor) I also had added a 3 position manual
1) Heat pump only
2) Heat pump only till low OS is met
3) Normal unrestricted mode.
Anyways, just needing a inexpensive delay here..
Simple delay on break time delay cube should do the trick, they run anywhere
from about $12 - $20 and are available in either fixed or adjustable delay.
Try a Rheem part number 42-ICM201 (fixed 5 minute delay), or PN 42-ICM203
Not quite sure of the exact terminology used, doesnt help that it seems the
terminology also varies by manufacturer.
What I wanting to do is place a delay relay inside the condensor unit wiring
box, such that upon any call for compressor the unit wouldn't start until a
couple minutes have elapsed....as you probably already know, the reasoning
here is because it's hard on compressor to re-start under high head, ( as
your LRA goes through the roof if you do this)...so best to first let
refrigerant pressures equalize for a couple minutes before attempting a
In case your not familiar with the taystat kit, what it designed to do (
unrestricted mode and without an outdoors ambient stat ) is to allow normal
heat pump operation heating mode UNLESS there is also a concurrent call for
the gas backup....at that point, the fossil kit shuts down the compressor
( high heat rise in the plenum would otherwise cause excessive high side
pressure where the evap coil is located downstream from the furnace HX )
So, at this point in time, you have the inside stat calling for both Y and
W, but the taystat has taken over, and shut down Y connection to the
Next, once inside temp is satisfied by the gas furnace, then the inside stat
shuts off W to the taystat, and also provides a delay ( via a std
sequencer )....so the gas quits, then a couple minutes later the heat pump
starts back up (so long as the inside stat is still calling for Y...
Anyways, since Ive broken the connection W with a manual switch and outdoors
stat, there now exists the possibility of inadvertantly causing a compressor
short cycle should someone manually operate the switch to lockout the gas
furnace, say for instance a child flicking the switch several times
FWIW, I did mention for him to shut the system down and wait a couple
minutes before flicking the--and he usually listens to me fairly well...
My brother ( fair lawyer, excellent beer drinker, not very good with things
electrical )...a couple weeks ago he and his neighbor had wired up a
generator during a power outage....had 220 going where there shoulda been
110...took out the 24v transformer and the white-rogers controller in his
furnace ( and ruined several other appliances, etc )...
And before anyone starts in, I did check operation of all safetys after
replacing the WR controller.
Yes and thanks again--btw, your rheem part# panned out for me, I got one on
Also ( in the case anyone here wants to stock up on some outdoor reset
thermostats) there's currently 70+ honeywell units available on ebay.
At a whopping "buy it now" price of $2.50 each then likely won't go wrong on
That's what I thought you were talking about. My suggestion is that a
delay on break would work better. When the
taystat cuts out the compressor it may or may not be running at that time. When
the taystat does switch back over to HP
and the delay time has been already complete it will start right away rather
than wait another five minutes to do so.
a delay on break would work better. When the
When the taystat does switch back over to HP
rather than wait another five minutes to do so.
Well thinking about it, yes there may be a better way to go about this that
involves placing another relay some place within the taystat, but frankly Im
getting kinda burnt out on the whole deal....
Feel free to make further suggestions, I'm gonna try and email you the
taystat schematic shortly.
Page 5 or 6 IIRC
Nevermind my above post, I got you now....basically a one shot delay..on
condition the delay has already occurred then another delay wont occur until
another cycle happens to shutdown the compressor--I just hadn't realized
such a beast existed.
Oh well, a two minute delay where I've placed it in the operational sequence
isn't gonna be a huge deal....there's always next time to do it with better
hardware, I spose.
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