Question on Vision Pro aka TH3220U thermostat - http://www.hvacmechanic.com/ Forums
Original message
| joelr
 |  "Question on Vision Pro aka TH3220U thermostat"
, posted Thu 17 Feb 21:01  
I am hoping Xenos can help me.
I had a Vision Pro installed for
a Trane XV90 gas furnace and a Trane
XL Heat Pump. The installer used
a "fosil fuel kit". I have installed
an outdoor temperature sensor because
I do not like the wait for heat when
it is cold outside, and every subsequent
call for heat. I would like to disconnect
the fosil fuel kit.
Q1: Is there a way for the Vision Pro to
control the W1 and W2 terminals on the
furnace separately, or should I just let
the furnace control module do this automatically?
The "E" terminal on the thermostat is curently
conected to the "X3" on the fosil fuel kit,
while the "AUX" is connected to "W3".
I assume the system type selection on the thermostat
should be for 2 heat/1 cool heat pump as the
selection for 3 heat/2cool heat pump assumes
(AFAIK) 2 state heat pump then 1 stage furnace,
not 2 stage furnace after 1 state heat pump.
Q2: Do I simply connect both "E" and "AUX" to "W1" and W2"
on the furnace? (The furnace instructions say to
wire W1 & W2 together if a 2 stage thermostat is not used.)
Thanks for any help you can provide.
Joel
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Replies:
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| Xenos
Webmaster 
| "Re(1):Question on Vision Pro aka TH3220U ther" , posted Thu 17 Feb 23:07
I can try. :)
Prior to rewiring anything I would first test it’s operation. Since you have installed an outdoor sensor set option 200 to 1, 210 to 0 and set 350 to your changeover point. Now when your below the set point only the Aux should power and the furnace should operate as if the external fossil fuel kit was never there. The problem is the furnace will not operate above the balance point unless the thermostat is switched to emg heat.
Xenos.
The best way to escape a problem is to solve it.
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| | joelr
| "Re(2):Question on Vision Pro aka TH3220U ther" , posted Fri 18 Feb 02:32:
I want to give it a try Friday, but I am still unclear
about how to connect everything without the fossil fuel
kit. I know switching 210 to 0 with the fossil fuel kit
does not work - no heat. I need to remove the fossil fuel kit.
My concern is over the E and AUX terminals.
Even if I leave W1 & W2 jumpered on the furnace,
I need to connect AUX to W1 & W2 to get heat.
So what do I do with E?
I know that Installer test 4 set to 1 only
activates E, while test 4 set to 2 activates
both E and AUX (is not documented in my manual).
Should I leave E open?
Also, I am thinking that 40 degrees is the appropriate
setting for 350.
Thanks for your help.
[this message was edited by joelr on Fri 18 Feb 02:34] |
| | Xenos
Webmaster
| "Re(3):Question on Vision Pro aka TH3220U ther" , posted Fri 18 Feb 10:17
With the changing of your thermostats options there actually shouldn't be any rewiring required, it should operate properly. This is due to how you present fosel fuel kit monitors the Aux terminal. I would first try the obove option prior to making any wiring changes.
Xenos.
The best way to escape a problem is to solve it.
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| | joelr
| "Re(4):Question on Vision Pro aka TH3220U ther" , posted Sun 20 Feb 00:41
Xenos,
I have finished and I needed to remove the fossil
fuel kit. If I left the kit in and only switched
option 210 from 1 (kit) to 0 (outside temperature sensor)
the furnace would not come on, only the heat pump
will work. The kit relies on both AUX and E
(connected to W3 and X3 of the kit - a TEYPLUS103A
from Trane) before energizing W1 to the furnace.
Option 210=0 only uses AUX for second stage heat,
or only E when switched manually to Emergency heat,
never both. I removed the kit and tied both AUX and
E to W1 (&W2) on the furnace.
If only Honeywell would document the thermostat's functions.
I think they would only end up with a few columns (16)
showing different option combinations (system type,
aux heat type, fuel kit) and outputs for fan, cool(1),
cool(2), heat(1), heat(2), heat(3), and emergency heat.
(Please scrool down, I don't know why there is a gap)
Joel
170
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1
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2
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3
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4
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5
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6
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7
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7
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7
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8
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9
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10
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11
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12
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12
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12
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200
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-
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-
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-
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-
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-
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-
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0
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1
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1
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-
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-
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-
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-
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0
|
1
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1
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210
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-
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-
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-
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-
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-
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-
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-
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1
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0
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-
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-
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-
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-
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-
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1
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0
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Fan
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G
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G
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-
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G
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?
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G
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G
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G
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G
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G
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G
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G
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G
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G
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G
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G
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Cool 1
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YG
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YGO
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-
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-
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-
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YG
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YGO
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YGO
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YGO
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YG
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YG
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YG
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YGO
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YGO
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YGO
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YGO
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Cool 2
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-
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-
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-
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-
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-
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-
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-
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-
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-
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YY2G
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-
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YY2G
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YY2GO
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YY2Go
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YY2GO
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YY2GO
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Heat 1
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W
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YG*
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W
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WG
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?
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-
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YG*
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YG*
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YG*
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W
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W
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W
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YG*
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YG*
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YG*
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YG*
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Heat 2
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-
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-
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-
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-
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-
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-
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AUX
|
AUX
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AUX
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W2
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W2
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-
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YY2G*
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YY2G*
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YY2G*
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YY2G*
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Heat 3
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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AUX
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AUX
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AUX
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Emergency
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-
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E
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-
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-
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-
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-
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E
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E
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E
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-
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-
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-
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E
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E
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E
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E
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Emer-2
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-
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-?
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-
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-
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-
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-
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Aux?
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Aux?
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Aux?
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-
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-
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-
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-?
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Aux?
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Aux?
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Aux?
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* if 190=1, O is switched polarity
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| | Xenos
Webmaster
| "Re(5):Question on Vision Pro aka TH3220U ther" , posted Sun 20 Feb 09:34
I don’t quite follow you, I am not quite sure of the question. However do you know the difference between Aux and E ? basically there the same the only difference is when the thermostat is switched to emergency heat the E terminal is used to power a relay to bypass an outdoor thermostat used in some heat pump to hold off Aux or in your case the fossil fuel kit and bring on the Aux heat as first stage. With the kit off the E terminal is redundant.
Xenos.
The best way to escape a problem is to solve it.
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| | joelr
| "Re(6):Question on Vision Pro aka TH3220U ther" , posted Sun 20 Feb 14:10
Xenos,
No more questions. It works fine.
Summary:
If I did not connect E and AUX together
(at least for option 170=7 & 200=1 & 210=0)
either 2nd stage heat (furnace) or
emergency heat (manual) would not work.
The thermostat only activates
AUX for 2nd stage heat and only
activates E when manually set to
emergency heat.
WillR states:
The E terminal only gets turned on when you switch to Emergency. If you only have 2 stages, jumper Aux and E.
In the section on page 19 that says "operation in Emergency heat mode" is wrong. When you program as above, IT WILL NOT SWITCH FROM E TO AUX WHILE IN EMERGENCY MODE"!!!!
The switching must be different when 210=0,
but I don't know how (not shown in table).
The table was just a vain attempt to tell Honeywell
a better way to document their thermostat.
Wishful thinking.
Joel
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| | WillR
| "Re(3):Question on Vision Pro aka TH3220U ther" , posted Fri 18 Feb 08:08
the way Xenos is telling you to set the VP up will let you remove the fossel fuel kit.
When in Standard heat, First it will use the heat pump, then below the balance point will switch to what is on AUX while locking out G (fan) and Y (compressor). When above the balance point, the thermostat will allow the Gas heat to come on (and lockout G and Y while AUX or E is on)if it can't recover fast enough by heat pump. You can regulate this is menu 680 (to find 680 you must change 290 to 3 first).
The E terminal only gets turned on when you switch to Emergency. If you only have 2 stages, jumper Aux and E. This way when you switch to emergency heat you will have gas heat.
the programing directions on Page 19 "Heat PUmp with Fossil Fuel Aux heat" explains this. In the section on page 19 that says "operation in Emergency heat mode" is wrong. When you program as above, IT WILL NOT SWITCH FROM E TO AUX WHILE IN EMERGENCY MODE"!!!! Change 200 to 0 and it will work, but it will not lock out G and Y when AUX turns on. I went around and around with Honeywell until they tested this and admited its a bug and don't work!!! But you only have 2 stage heat, so strap E and AUX together and you will never know the bug is there.
I have my menu 350 set at 30.
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| | joelr
| "Re(4):Question on Vision Pro aka TH3220U ther" , posted Fri 18 Feb 13:55
Thanks to both of you.
I like the thermostat, but I think the
documentation is lacking.
I was trying to figure out the functions
with an ohm meter off base using the test
modes. The test modes seem to be cumulative,
(as stated in the manual) which makes it confusing.
For example, seting 170 = 7, 200=1, 210=0 yeilds:
test 1=1: RC to Y & G, R to O (cooling)
test 2=1: RC to G (fan)
test 3=1: RC to Y & G (heat pump heating)
test 3=2: RC to Y & G, R to AUX (furnace heating, Y&G would not be on in this mode, no test mode for state 2 heat only)
test 4=1: RC to G & L, R to E (emergency heat)
test 4=2: RC to G & L, R to E & AUX (not documented, does this suggest that AUX would be selected if E does not heat?
Perhaps they saw the bug so left this mode out of the manual.)
I will remove the fossil fuel kit and jumper AUX to E
and see how it works.
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