Proposed Changes to PTCS Air Source Heat Pump Specifications

April 18, 2006 RTF Meeting

Bob Davis, Ecotope

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

PTCS Provider Reqs

• Expanded Section 1• Text addresses PTCS

Provider role– Training on specs

– Data mgmnt

– Tech registry

– Data review

– Field QA

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

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

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”

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