proposed changes to ptcs air source heat pump specifications april 18, 2006 rtf meeting bob davis,...
TRANSCRIPT
![Page 1: Proposed Changes to PTCS Air Source Heat Pump Specifications April 18, 2006 RTF Meeting Bob Davis, Ecotope](https://reader035.vdocuments.net/reader035/viewer/2022062806/56649e255503460f94b14854/html5/thumbnails/1.jpg)
Proposed Changes to PTCS Air Source Heat Pump Specifications
April 18, 2006 RTF Meeting
Bob Davis, Ecotope
![Page 2: Proposed Changes to PTCS Air Source Heat Pump Specifications April 18, 2006 RTF Meeting Bob Davis, Ecotope](https://reader035.vdocuments.net/reader035/viewer/2022062806/56649e255503460f94b14854/html5/thumbnails/2.jpg)
Overview of Changes
• PTCS Provider requirements/duties enumerated (major addition)
• Technician reporting requirements more completely described
• Duct location designation made more generic• Controls section slightly expanded and clarified• Refrig. charge section expanded and clarified• Wording changes added throughout to distinguish
between new installs and service
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PTCS Provider Reqs
• Expanded Section 1• Text addresses PTCS
Provider role– Training on specs
– Data mgmnt
– Tech registry
– Data review
– Field QA
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Duct Language Changes
• Section 3.2
• Unconditioned/cond-
itioned space language taken out (left up to specific programs to define)
• New section 8.2.3 says new duct systems should meet PTCS tightness requirements
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Controls Changes/Addition
• Was Section 4.3/4.4; now Section 5• Aux heat staging/sequencing language removed• Added sentence to clearly specify no aux heat
allowed in Stage 1 call• Single capacity compressor: added explicit
sentence saying discharge air sensor control not allowed
• Multi-stage compressor: added option to allow discharge air sensor staging temperature warmer than 85° F (current req) as long as ODT is installed
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Refrigerant Checks (formerly Section 5.4, now Section 7)
• Complying methods now more specific:– Operating pressures (year-
round)– Capacity check (ditto)– Superheat/subcooling
(summer)
• Documentation– CheckMe– ACRx– New HP start up form– “other approved method”
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Summary
• Recommend acceptance of revised/amended HP specs
• Need to come up with language for dual-fuel “hybrid” systems
• Need to revise/amend ground/water-source HP specs