[DeTomaso] A/C deicing switch sensor
Forest Goodhart
forestg at att.net
Sat Jul 16 00:17:18 EDT 2016
That is a description of the operation of the TXV. What Jim asked about was the deicing switch that cycles the compressor to prevent icing up the evaporator.
From: Larry Stock <larrys at panteraparts.com>
To: Forest Goodhart <forestg at att.net>; Jim Gray <grayjim at cox.net>; "detomaso at detomasolist.com" <detomaso at detomasolist.com>
Sent: Friday, July 15, 2016 6:16 PM
Subject: Re: [DeTomaso] A/C deicing switch sensor
* Technically speaking a Thermal Bulb is the probably
best terminology for that sensor tube attached to the expansion
valve since it is not electrically controlled at the evaporator
valve and in a Pantera That expansion valve assembly is also your
sized orifice metering tube that makes it cold, but not too cold.
This metering valve orifice tube size should be different between
R-12 and R-134 systems for best operation.
*
* A thermal bulb has a small line filled with C02 is attached to the
evaporator tailpipe. If the temperature on the tail pipe raises,
the gas will expand and cause pressure against the diaphram. This
expansion will then move the seat away from the orifice, allowing
an increased refrigerant flow. As the tail pipe temperature drops,
the pressure in the thermal bulb also drops, allowing the valve to
restrict flow as required by the evaporator.
* The pressure of the refrigerant entering the evaporator is fed back
to the underside of the diaphragm through the internal equalizing
passage. Expansion of the gas in the thermal bulb must overcome the
internal balancing pressure before the valve will open to increase
refrigerant flow.
* Larry @ Pantera Parts Connection
From: Forest Goodhart <[1]forestg at att.net>
Reply-To: Forest Goodhart <[2]forestg at att.net>
Date: Friday, July 15, 2016 at 5:32 PM
To: Larry Stock <[3]Larrys at PanteraParts.com>, Jim Gray
<[4]grayjim at cox.net>, "[5]detomaso at detomasolist.com"
<[6]detomaso at detomasolist.com>
Subject: Re: [DeTomaso] A/C deicing switch sensor
It is not a thermocouple. It is a gas filled capillary tube. It should
be inserted into the case 4".
__________________________________________________________________
From: Larry Stock <[7]larrys at panteraparts.com>
To: Jim Gray <[8]grayjim at cox.net>; [9]detomaso at detomasolist.com
Sent: Friday, July 15, 2016 5:22 PM
Subject: Re: [DeTomaso] A/C deicing switch sensor
Hey Jim, That tube is called a thermocouple. It senses the temperature
in
the Evaporator to keep it above freezing the coils. It is about 10(c)-:
long,
and should also be packed with a putty substance as far across and as
close to the coils as possible for most accurate operation. The coils
are
back inside quite aways with is why it is as long as it is.
Larry @ Pantera Parts Connection
On 7/15/16, 2:38 PM, "DeTomaso on behalf of Jim Gray"
<[10]detomaso-bounces at server.detomasolist.com on behalf of
[11]grayjim at cox.net>
wrote:
>Reinstalling A/C on-off switch. Approximately how far does the temp
>sensing
>tube go into the fan housing? As I remember the excess tubing was in a
>loose
>coil near to one of the refrigerant hoses.
>
>Thanks in advance.
>
>Jim Gray
>
>_______________________________________________
>
>
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References
1. mailto:forestg at att.net
2. mailto:forestg at att.net
3. mailto:Larrys at PanteraParts.com
4. mailto:grayjim at cox.net
5. mailto:detomaso at detomasolist.com
6. mailto:detomaso at detomasolist.com
7. mailto:larrys at panteraparts.com
8. mailto:grayjim at cox.net
9. mailto:detomaso at detomasolist.com
10. mailto:detomaso-bounces at server.detomasolist.com
11. mailto:grayjim at cox.net
12. mailto:DeTomaso at server.detomasolist.com
13. http://server.detomasolist.com/mailman/listinfo/detomaso
14. mailto:DeTomaso at server.detomasolist.com
15. http://server.detomasolist.com/mailman/listinfo/detomaso
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-------------- next part --------------
That is a description of the operation of the TXV. What Jim asked about
was the deicing switch that cycles the compressor to prevent icing up
the evaporator.
__________________________________________________________________
From: Larry Stock <larrys at panteraparts.com>
To: Forest Goodhart <forestg at att.net>; Jim Gray <grayjim at cox.net>;
"detomaso at detomasolist.com" <detomaso at detomasolist.com>
Sent: Friday, July 15, 2016 6:16 PM
Subject: Re: [DeTomaso] A/C deicing switch sensor
* Technically speaking a Thermal Bulb is the probably
best terminology for that sensor tube attached to the expansion
valve since it is not electrically controlled at the evaporator
valve and in a Pantera That expansion valve assembly is also your
sized orifice metering tube that makes it cold, but not too cold.
This metering valve orifice tube size should be different between
R-12 and R-134 systems for best operation.
*
* A thermal bulb has a small line filled with C02 is attached to
the
evaporator tailpipe. If the temperature on the tail pipe raises,
the gas will expand and cause pressure against the diaphram. This
expansion will then move the seat away from the orifice, allowing
an increased refrigerant flow. As the tail pipe temperature
drops,
the pressure in the thermal bulb also drops, allowing the valve
to
restrict flow as required by the evaporator.
* The pressure of the refrigerant entering the evaporator is fed
back
to the underside of the diaphragm through the internal equalizing
passage. Expansion of the gas in the thermal bulb must overcome
the
internal balancing pressure before the valve will open to
increase
refrigerant flow.
* Larry @ Pantera Parts Connection
From: Forest Goodhart <[1][1]forestg at att.net>
Reply-To: Forest Goodhart <[2][2]forestg at att.net>
Date: Friday, July 15, 2016 at 5:32 PM
To: Larry Stock <[3][3]Larrys at PanteraParts.com>, Jim Gray
<[4][4]grayjim at cox.net>, "[5][5]detomaso at detomasolist.com"
<[6][6]detomaso at detomasolist.com>
Subject: Re: [DeTomaso] A/C deicing switch sensor
It is not a thermocouple. It is a gas filled capillary tube. It
should
be inserted into the case 4".
__________________________________________________________________
From: Larry Stock <[7][7]larrys at panteraparts.com>
To: Jim Gray <[8][8]grayjim at cox.net>; [9][9]detomaso at detomasolist.com
Sent: Friday, July 15, 2016 5:22 PM
Subject: Re: [DeTomaso] A/C deicing switch sensor
Hey Jim, That tube is called a thermocouple. It senses the
temperature
in
the Evaporator to keep it above freezing the coils. It is about
10(c)-:
long,
and should also be packed with a putty substance as far across and as
close to the coils as possible for most accurate operation. The coils
are
back inside quite aways with is why it is as long as it is.
Larry @ Pantera Parts Connection
On 7/15/16, 2:38 PM, "DeTomaso on behalf of Jim Gray"
<[10][10]detomaso-bounces at server.detomasolist.com on behalf of
[11][11]grayjim at cox.net>
wrote:
>Reinstalling A/C on-off switch. Approximately how far does the temp
>sensing
>tube go into the fan housing? As I remember the excess tubing was in
a
>loose
>coil near to one of the refrigerant hoses.
>
>Thanks in advance.
>
>Jim Gray
>
>_______________________________________________
>
>
>Detomaso Email List is not managed by POCA
>Posted emails must not exceed 1.5 Megabytes
>DeTomaso mailing list
>[12][12]DeTomaso at server.detomasolist.com
>[13][13]http://server.detomasolist.com/mailman/listinfo/detomaso
>
>To manage your subscription (change email address, unsubscribe,
etc.)
use
>the links above.
>
>Members who post to this list grant license to the list to forward
any
>message posted here to all past, current, or future members of the
list.
>They also grant the list owner permission to maintain an archive or
>approve the archiving of list messages.
>
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References
1. mailto:[16]forestg at att.net
2. mailto:[17]forestg at att.net
3. mailto:[18]Larrys at PanteraParts.com
4. mailto:[19]grayjim at cox.net
5. mailto:[20]detomaso at detomasolist.com
6. mailto:[21]detomaso at detomasolist.com
7. mailto:[22]larrys at panteraparts.com
8. mailto:[23]grayjim at cox.net
9. mailto:[24]detomaso at detomasolist.com
10. mailto:[25]detomaso-bounces at server.detomasolist.com
11. mailto:[26]grayjim at cox.net
12. mailto:[27]DeTomaso at server.detomasolist.com
13. [28]http://server.detomasolist.com/mailman/listinfo/detomaso
14. mailto:[29]DeTomaso at server.detomasolist.com
15. [30]http://server.detomasolist.com/mailman/listinfo/detomaso
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Members who post to this list grant license to the list to forward any
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list. They also grant the list owner permission to maintain an archive
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References
1. mailto:forestg at att.net
2. mailto:forestg at att.net
3. mailto:Larrys at PanteraParts.com
4. mailto:grayjim at cox.net
5. mailto:detomaso at detomasolist.com
6. mailto:detomaso at detomasolist.com
7. mailto:larrys at panteraparts.com
8. mailto:grayjim at cox.net
9. mailto:detomaso at detomasolist.com
10. mailto:detomaso-bounces at server.detomasolist.com
11. mailto:grayjim at cox.net
12. mailto:DeTomaso at server.detomasolist.com
13. http://server.detomasolist.com/mailman/listinfo/detomaso
14. mailto:DeTomaso at server.detomasolist.com
15. http://server.detomasolist.com/mailman/listinfo/detomaso
16. mailto:forestg at att.net
17. mailto:forestg at att.net
18. mailto:Larrys at PanteraParts.com
19. mailto:grayjim at cox.net
20. mailto:detomaso at detomasolist.com
21. mailto:detomaso at detomasolist.com
22. mailto:larrys at panteraparts.com
23. mailto:grayjim at cox.net
24. mailto:detomaso at detomasolist.com
25. mailto:detomaso-bounces at server.detomasolist.com
26. mailto:grayjim at cox.net
27. mailto:DeTomaso at server.detomasolist.com
28. http://server.detomasolist.com/mailman/listinfo/detomaso
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