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Schrader Under the High Pressure Cutout - Pueblo Chillers

Updated

Issue:

Is there a schrader under the high pressure cutout?

Resolution:

  • There is NO schrader valve under the high-pressure cutout switch on current production Pueblo chillers. Therefore, the refrigerant will need to be isolated prior to replacing the switch.

    • Chillers with BPHE (CGAM/ACS) require the entire charge to be recovered for replacement of the HPCO.

    • Chillers with shell and tube evaporators (RTHD/RTWD/RTAC) require the charge to be recovered OR the refrigerant can be isolated into the evaporator for replacement of the HPCO.

 

  • Chillers
    • RTHD - The HPCO is NOT mounted on a schrader valve for chillers built with design sequence M0 and later. Refrigerant handling will need to be performed.
    • RTHD - The HPCO is mounted on a schrader for chillers built with A0 thru L0.
    • RTHC - The HPCO is mounted on a schrader valve.
    • RTHB - The HPCO is NOT mounted on a schrader valve for chillers built with design sequence A0 thru E0. (U97CXXXXX or earlier).  Refrigerant handling will need to be performed.
    • RTHB - The HPCO is mounted on a schrader for chillers built with design sequence F0 and later. (U97DXXXXX or later).
      • Reference service bulletin RTHB-SB-4
    • RTHA - The HPCO is NOT mounted on a schrader valve.  Refrigerant handling will need to be performed.
    • RTAA - The HPCO is NOT mounted on a schrader valve.  Refrigerant handling will need to be performed.
    • RTWA/RTUA - The HPCO is NOT mounted on a schrader valve.  Refrigerant handling will need to be performed.
    • CGW/CCA = The HPCO is NOT mounted on a schrader valve.  The entire charge needs to be recovered for replacement of the HPCO.
    • CGAF = The HPCO is NOT mounted on a schrader valve.  The entire charge needs to be recovered for replacement of the HPCO.

 

 

Notes:

 

Resources Available:

Other Question/Problem/Cause Statements:

  • Is there a schrader under the high pressure cutout?
  • Replacing the high pressure cutout, is there a schrader valve under it?
  • Is there a schrader valve on the high pressure cutout on the discharge line?
  • Does a U94J RTHB have a Schrader valve on the high pressure cutout on the discharge line.
  • Is there a valve under the HPC?
  • Is there a schrader valve beneath the HPC?
  • Is there a schrader valve beneath the High Pressure Cutout?

Facts:

  • Pueblo Screw and Scroll
  • CGAM
  • ACSA
  • ACXA
  • RTAC
  • Water-Cooled Chiller (Pueblo) (RTHD)
  • Water-Cooled Chiller (Pueblo) (RTHC)
  • Water-Cooled Chiller (Pueblo) (RTHA)
  • Water-Cooled Chiller (Pueblo) (RTHB)

 

Original HUB Document : DOC-105458

 

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.

 

 

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