Author Topic: calibrated orifice DFS2A  (Read 9934 times)

Offline Icehouse

  • Technician
  • Member Since: Oct 2008
  • Posts: 569
    • hvacbob
Re: calibrated orifice
« Reply #10 on: May 28, 2009, 09:42:43 AM »
 :) Sorry I get long winded.
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline Icehouse

  • Technician
  • Member Since: Oct 2008
  • Posts: 569
    • hvacbob
Re: calibrated orifice
« Reply #11 on: June 01, 2009, 03:22:13 PM »
pat, I see you also went on "Romans" site. There you said it happens on hot days also.
Here is a little more for you to digest.

Diagnosing A Restricted Feed Device
To diagnose the problem, it is easy as 1,2,3.
1. Shut the blower section off
2. Start the compressor
3. View the evaporator coil and be sure that there is a "full frost" pattern from the enterance of the evaporator to the exit.

If there is a restriction, part of the evaporator coil will be free of frost.
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline JWWebster

  • Technician
  • Member Since: Jan 2008
  • Posts: 8781
  • Country: us
  • SublimeMasterJW
    • Buy me a beer through paypal
    • JW's Sublime Appliance Advice
Re: calibrated orifice
« Reply #12 on: June 01, 2009, 10:30:08 PM »
OK so far we have learned how to diagnose a restriction now onwards toward a solution? Now what must we do to be saved?
« Last Edit: June 01, 2009, 10:32:30 PM by JWWebster »
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline Icehouse

  • Technician
  • Member Since: Oct 2008
  • Posts: 569
    • hvacbob
Re: calibrated orifice
« Reply #13 on: June 02, 2009, 09:32:51 AM »
Give the correct information, those pressures are way off for R22.  ;)
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline Icehouse

  • Technician
  • Member Since: Oct 2008
  • Posts: 569
    • hvacbob
Re: calibrated orifice
« Reply #14 on: June 02, 2009, 10:27:05 AM »
Read the following:  :)
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline patvac

  • VIP Member
  • Member Since: May 2009
  • Posts: 18
Re: calibrated orifice
« Reply #15 on: June 05, 2009, 03:22:54 PM »
high       Low

165         40

150          25

150         23    (psi)





Temperature external of evaporator 49.5F at 23 psi   (shoud be -2F)

Temperature external of condenser 97 F at the fan at 150 psi (shoud be -82.5F)



Fitting at the condenser are full of ice and evaporator his starting to fill up too.



Thank you

Offline patvac

  • VIP Member
  • Member Since: May 2009
  • Posts: 18
Re: calibrated orifice
« Reply #16 on: June 05, 2009, 03:25:32 PM »
The top part of the evaporator his freezing faster and with a lot more ice than the bottom one

Offline Icehouse

  • Technician
  • Member Since: Oct 2008
  • Posts: 569
    • hvacbob
Re: calibrated orifice
« Reply #17 on: June 05, 2009, 04:53:51 PM »
high       Low

165         40

150          25

150         23    (psi)





Temperature external of evaporator 49.5F at 23 psi   (shoud be -2F)

Temperature external of condenser 97 F at the fan at 150 psi (shoud be -82.5F)



Fitting at the condenser are full of ice and evaporator his starting to fill up too.



Thank you

Where are you getting your information from ? The evaporator is internal (inside the room) and condenser is external (outside the room)
Those pressures are too low for R22 period
NATE, NCCER, PHCC,HVAC Certified Instructor
Member RSES, US Army Refrigeration Specialist(Retired), Former Refrigeration Teacher NYC Board of Ed.
a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/

Offline JWWebster

  • Technician
  • Member Since: Jan 2008
  • Posts: 8781
  • Country: us
  • SublimeMasterJW
    • Buy me a beer through paypal
    • JW's Sublime Appliance Advice
Re: calibrated orifice
« Reply #18 on: June 05, 2009, 07:33:06 PM »
Brang yer low side pressure up to 68.5 PSI and see if that don't fugging git it right. verify it by checking the amp draw.
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline patvac

  • VIP Member
  • Member Since: May 2009
  • Posts: 18
Re: calibrated orifice
« Reply #19 on: June 14, 2009, 09:54:52 PM »
hi, i have try icehouse method and the result make no sens, ( i am probable not doing it correctly). With the help of a friend i have check where i tough they was a restriction. there is notting. We applied vaccum for 2 hours and charge the unit. The unit said 3.1pounds up to 25 feet of refrigerant lines. Is that combine lines or each one (example 25 suction and 25 pressure would make 50 or 25) Because i have 20 on each side and we consider it would make 40 so we add 0.9 oz per 3 feet of pipping. Problem is still there. My friend doesn't  have the tool for the wet temp bulb ( sorry icehouse). I decided to try something. I have covered the partially the condenser with one of my jackets.because the temperature of the air blown by the condenser was similar to the exterior temp. The air now is hotter( Du to the increase of the pressure ) the unit inside is not freezing up any more ( tested only a couple of hours) evaporator temperature is a bit hotter then it was but no more freezing. It Increase low pressure  like one of you asked me. Is my unit over or under charge thank you