Schrader Under the High Pressure Cutout - Pueblo Chillers

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:

• Reference Literature: (Electronic copies can be pulled from e-library at https://elibrary.tranetechnologies.com/residential/)
  • Service Bulletin: RTHB-SB-4

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