[DeTomaso] A/C deicing switch sensor

Fri Jul 15 21:16:52 EDT 2016

* 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 <forestg at att.net>
Reply-To:  Forest Goodhart <forestg at att.net>
Date:  Friday, July 15, 2016 at 5:32 PM
To:  Larry Stock <Larrys at PanteraParts.com>, Jim Gray <grayjim at cox.net>,
"detomaso at detomasolist.com" <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 <larrys at panteraparts.com>
 To: Jim Gray <grayjim at cox.net>; 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 10² 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"
<detomaso-bounces at server.detomasolist.com on behalf of 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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-------------- next part --------------
     * 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
   >
   >_______________________________________________
   >
   >
   >Detomaso Email List is not managed by POCA
   >Posted emails must not exceed 1.5 Megabytes
   >DeTomaso mailing list
   >[12]DeTomaso at server.detomasolist.com
   >[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: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