Original message
| icom
 |  "Entalphy control on heat pump"
, posted Sat 21 Aug 00:19  
We have a York 2 stage heat pump that takes care of a Transmitter site building. although we never have to use the heat mode on this unit. I would like to know about what temp the entalphy damper motor would open the outside dampers. It is 24 vac damper motor relay and circuit board sensor controlled.
Welder
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Replies:
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| klrogers
| "Re(1):Entalphy control on heat pump" , posted Sun 22 Aug 18:41:
Here's a link to a graph that shows typical settings for Honeywell enthaply controllers, most manufacturers use the same A,B,C,D, settings.
Enthaply Chart
Kevin Rogers
[this message was edited by klrogers on Sun 22 Aug 18:43] |
| Xenos
Webmaster 
| "Re(1):Entalphy control on heat pump" , posted Sun 22 Aug 11:13
As you have just stated it’s not temperature but enthalpy that controls it. Enthalpy controls, basically are used to allow free cooling above 55, if the air is dry enough the ability to be utilizing free cooling at 68 or 70 is possible.
There would be a chart on the unit to show the changover conditions on a graph.
Xenos.
The best way to escape a problem is to solve it.
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| | icom
| "Re(2):Entalphy control on heat pump" , posted Wed 25 Aug 01:18
Although I could not get a service manual for this unit I did get a installation and startup paperwork from York. You were right about the a.b.c.d curve. It could open at 65 degrees if RH was 50%. Motor has 12 terminals on it not sure what I can do to exercise it to see if dampers work or motor is locked. I do have 24 volts on terminals Tr1 and Tr. Took it out to look at it on bench But I had to put it back in unit won't run with molex connector pulled. Blding was getting hot.York paper states I can turn minimum position screw on motor fully clockwise and the energize and deenergize terminals R to G to see if damper blades run smooth. However only terminals I have on motor are So,,Sg,,To,,Tr,,N,,1,,2,,3,,4,,T,,T1,(,P and P1 which are jumpered)Tr ,,Tr1 May have to contact honeywell about this.
Welder
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| | Xenos
Webmaster
| "Re(3):Entalphy control on heat pump" , posted Wed 25 Aug 08:27
What is the model number of the motor?
Xenos.
The best way to escape a problem is to solve it.
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| | icom
| "Re(4):Entalphy control on heat pump" , posted Wed 25 Aug 10:30
Lots on numbers stamped on motor I think its this first one,(M7415A1014) others are as follows--(BWCES025-26250),(W7459A1019),(AX031-00862)
Welder
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| | Xenos
Webmaster
| "Re(5):Entalphy control on heat pump" , posted Wed 25 Aug 19:26
If P and P1 are shorted, open it and the motor should drive. Here is the manual.
http://hbctechlit.honeywell.com./techlit/PDF/63-0000s/63-2484.pdf
Xenos.
The best way to escape a problem is to solve it.
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| | Hal_C
| "Re(6):Entalphy control on heat pump" , posted Sun 29 Aug 15:37
What is the problem your having with it?
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| | icom
| "Re(7):Entalphy control on heat pump" , posted Tue 31 Aug 01:39
Blding engineer at site doesn't think they are working.I haven't had time to unhook P1 and P to to exercise the damper yet. Will try in a couple of days. (college kids are back and I and 7 others have some 34 bldings to service)
Welder
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| | Xenos
Webmaster
| "Re(8):Entalphy control on heat pump" , posted Tue 31 Aug 07:33
If there all connected. There should be a 4x4 black box connected to it. Just turn the little micro dial at the bottom. It’s connected to P1 and p2
Xenos.
The best way to escape a problem is to solve it.
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| | icom
| "Re(9):Entalphy control on heat pump" , posted Wed 8 Sep 21:09
nice cool night tonite with low humidity, rotated minimum damper position to max,dampers moved full range. looks like all is well. Thanks to everyone for the help excellant website.
Welder
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