Point Dictionary: HP

Heat pump point dictionary. Air-side and compressor points carry from the AHU/RTU dictionaries. Thermal power is canonically a host-derived Function output; active electrical power uses the meter pattern. Mode command remains Brick-only until a deployment models its custom enumeration, and defrost status remains provisional. Owning equipment: the packaged heat pump unit. EXPANSION 2026-08-17: refrigerant-side points added for the refrigerant-side HP-0004/0005/0006 family (NIST SP 1087 grounding); the two saturation temperatures are HOST-DERIVED virtual points per SCHEMA.md’s virtual-point convention. ASHRAE 223 mappings are pinned to the public-review artifact 223p-1.0.0-ppr2.1.ttl (owl:versionInfo 1.0.0-ppr.2.1; SHA-256 1f156f9938c0be430d2216e01e31bb183c438ba318d8d4a23d2f074ebcd6f573), not an inferred final 2026 release. That artifact imports QUDT 3.1.8; the quantity-kind and unit local names here were independently checked against the repository-declared QUDT 3.1.4 artifacts.

thermal_power

Delivered thermal output (heating or cooling), kW

• 223P: Host calculation represented as a Function whose hasOutput is a QuantifiableProperty
• QUDT unit: KiloW

Canonical host-derived useful heating or cooling output (for example airflow x cp x temperature difference), represented as a Function output. Record derivation, mode sign convention, averaging, and sensor provenance. A physical thermal meter is a separate observable binding.

elec_power

Compressor electrical input power, kW

• 223P: ElectricityMeter reports a QuantifiableObservableProperty with ActivePower/KiloW at the compressor electrical Connection or ConnectionPoint
• QUDT unit: KiloW

Brick 1.4.4 has no Electrical_Power_Sensor class; Active_Power_Sensor (verified) is the correct real-power reading. Bind the compressor circuit, not the whole unit, or fan energy pollutes the COP.

oat

Outdoor air temperature

• 223P: Sensor observes QuantifiableObservableProperty at the outdoor-air intake
• QUDT unit: DEG_C

Brick spelling is Outside_ (Outdoor_Air_Temperature_Sensor does not exist). Role-OutdoorAirIntake is 223P’s only outdoor role; used by reference instance oa-temp. [HP dictionary] Brick class and 223P pattern carried over (equipment-independent); used by the COP baseline (regression axis) and defrost sanity test.

sat

Supply (discharge) air temperature

• 223P: Sensor observes QuantifiableObservableProperty attached to the AHU supply-air OutletConnectionPoint
• QUDT unit: DEG_C

Brick Discharge_Air_Temperature_Sensor is brick:aliasOf this class. 223P pattern verbatim from reference instance MultipleZoneAhu-sa-temp; medium comes from hasMedium on the owning ConnectionPoint. [HP dictionary] Brick class and 223P pattern carried over (equipment-independent); for HP-0003 the discharge temperature is the reversing-valve witness.

comp_cmd

Final run command for the bound heat-pump compressor or compressor scope

• 223P: EnumeratedActuatableProperty on the bound Compressor via hasProperty

brick:Start_Stop_Command and brick:Compressor are exact Brick 1.4.4 classes. PPR2.1 Compressor, EnumeratedActuatableProperty, and Binary-OnOff are exact, but no public reference-model compressor command instance was found, so the attachment remains provisional. Default binding is one compressor/circuit after normal sequenced permissives; an aggregate OR is a lossy documented exception and must use the identical scope as comp_status.

comp_status

Independent run proof for the bound heat-pump compressor or compressor scope

• 223P: EnumeratedObservableProperty on the Compressor via hasProperty

Brick 1.4.4 On_Off_Status and Compressor are exact generic classes; PPR2.1 EnumeratedObservableProperty and Binary-OnOff are exact, but no public compressor-property instance was found, so the attachment remains provisional. Default to one compressor/circuit. An aggregate OR is allowed only as an explicit matched command/status scope and hides a lag failure while another compressor remains on.

aux_heat_status

Independent active-production status for the explicitly classified auxiliary heat source

• 223P: EnumeratedObservableProperty with Binary-OnOff on explicitly classified auxiliary heating Equipment such as an ElectricResistanceElement or Furnace; Role-Heating and containment/topology establish scope

brick:Heating_Start_Stop_Status and the generic PPR2.1 heating/status terms are exact, but neither ontology has an exact auxiliary role. Deployment must identify separate auxiliary equipment and independent current, fuel-flow, thermal, contactor, or local-stage proof that it is actively producing heat. Do not bind availability, demand, command echo, crankcase heat, base-pan heat, or defrost heat.

defrost_status

Defrost cycle active (true while the unit is in defrost)

• 223P: EnumeratedObservableProperty (Binary-OnOff) on the defrost sequence via hasProperty

Brick 1.4.4 has no Defrost_Status class (grep-verified absent); bind the BAS/unit defrost-active flag and tag the generic Status pattern. Sampling caveat for HP-0002: a defrost cycle shorter than the host tick is invisible to the edge counter — tick well below the ~5-10 min cycle length.

mode_command

Commanded operating mode (host-mapped integer; library encoding 1 = HEATING, 2 = COOLING)

• QUDT unit: UNITLESS

brick:Mode_Command grep-verified in Brick 1.4.4. The 1/2 encoding is this library’s convention (expected_mode precedent); HP-0003 exposes both codes as rule params so hosts with their own enum rebind without editing the graph. PPR2.1 has no standard EnumerationKind for the library’s site-mapped 1/2 mode encoding, so the s223 mapping is null until a deployment supplies a custom enumeration.

suction_temp

Compressor suction line refrigerant temperature (surface-mount acceptable)

• 223P: Sensor observes a QuantifiableObservableProperty at the Compressor suction ConnectionPoint
• QUDT unit: DEG_C

No Brick 1.4.4 suction-temperature class (only Refrigerant_Level_Sensor exists refrigerant-side); null mapping per defrost_status precedent. Superheat = suction_temp - evap_sat_temp.

liquid_temp

Liquid line refrigerant temperature (surface-mount acceptable)

• 223P: Sensor observes a QuantifiableObservableProperty at the condenser liquid-line outlet ConnectionPoint
• QUDT unit: DEG_C

No Brick 1.4.4 class; null mapping. Subcooling = cond_sat_temp - liquid_temp.

evap_sat_temp

Evaporating saturation temperature (HOST-DERIVED: suction pressure via refrigerant P-T lookup, or coil-surface proxy)

• 223P: Function hasOutput a QuantifiableProperty derived from refrigerant pressure and a refrigerant-specific pressure-temperature relation
• QUDT unit: DEG_C

HOST-DERIVED virtual point (zone_reheat_fraction/chw_valve_max precedent): the P-T relationship is refrigerant-specific and lives at the host, never in a rule graph. Derivation MUST match the site’s refrigerant.

cond_sat_temp

Condensing saturation temperature (HOST-DERIVED: discharge/liquid pressure via refrigerant P-T lookup)

• 223P: Function hasOutput a QuantifiableProperty derived from refrigerant pressure and a refrigerant-specific pressure-temperature relation
• QUDT unit: DEG_C

HOST-DERIVED virtual point, same convention and refrigerant caveat as evap_sat_temp.

comp_discharge_temp

Compressor discharge line refrigerant temperature (surface-mount acceptable)

• 223P: Sensor observes a QuantifiableObservableProperty at the Compressor discharge ConnectionPoint
• QUDT unit: DEG_C

No Brick 1.4.4 class models refrigerant-line temperatures (suction_temp precedent; discharge-AIR classes are the wrong medium). Refrigerant side, hot-gas line between compressor and reversing valve. Consumed by the reversing-valve internal-leakage rule (HP-0006): NIST SP 1087 (2008) found leakage raises discharge and evaporating temperature while condensing temperature and subcooling fall, with superheat unaffected.