Point Dictionary: FPB

Fan-powered-terminal point dictionary for series (SFPU) and parallel (PFPU) VAV terminal units. Brick 1.4.4 has generic Terminal_Unit but no exact fan-powered subtype; model a Terminal_Unit containing the exact Fan/Reheat_Valve/coil points and topology. ASHRAE 223 PPR2.1 has exact FanPoweredTerminal and Role-Primary; series/parallel remains deployment topology. ASHRAE 223 local names were checked against 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; quantity-kind and unit names were independently checked against repository-declared QUDT 3.1.4. Brick 1.4.4 was checked against Brick.ttl SHA-256 b65720b7b9b64c646745c689777e6138c0d59ce0088df0aeb78fbd444d04d8e7.

fan_cmd

Final command requesting operation of this fan-powered terminal’s fan

• 223P: EnumeratedActuatableProperty with Binary-OnOff on the Fan contained by the FanPoweredTerminal via hasProperty

Attach brick:Start_Stop_Command to the contained brick:Fan, not the terminal or AHU enable. PPR2.1 s223:FanPoweredTerminal requires a contained s223:Fan and the Boolean property terms are exact. Bind after subtype sequence ownership, intentional delays, and normal interlocks.

fan_status

Independent run proof for this fan-powered terminal’s fan

• 223P: EnumeratedObservableProperty with Binary-OnOff on the same Fan contained by the FanPoweredTerminal via hasProperty

Attach brick:Fan_On_Off_Status to the same contained fan as fan_cmd. Require independent current, speed/rotation, airflow/pressure, or auxiliary-contact proof; command echo is invalid. For PFPU rules the proof must establish airflow through the fan/reheat branch.

primary_airflow

Measured AHU-fed primary air entering the fan-powered terminal, excluding induced/plenum branch flow

• 223P: FlowSensor observes a QuantifiableObservableProperty at the FanPoweredTerminal primary inlet ConnectionPoint whose hasRole is Role-Primary
• QUDT unit: L-PER-SEC

brick:Supply_Air_Flow_Sensor is exact for the AHU-fed supply/primary stream. PPR2.1 FanPoweredTerminal, FlowSensor, VolumeFlowRate, L-PER-SEC, Fluid-Air and Role-Primary are exact; Role-Primary belongs on the ConnectionPoint via hasRole, not in this property’s aspects array. Do not bind total discharge or the PFPU induced branch.

primary_airflow_sp

Final active primary-airflow setpoint after occupancy, ventilation, and heating/cooling logic

• 223P: QuantifiableActuatableProperty with Aspect-Setpoint linked by hasSetpoint from the primary inlet airflow property of the FanPoweredTerminal
• QUDT unit: L-PER-SEC

Brick and PPR2.1 setpoint/property terms are exact. Bind the active delivered target, not design minimum or maximum unless it is currently selected. Primary scope is established by the paired property and inlet ConnectionPoint topology.

rht_vlv_cmd

Hydronic reheat valve command, 0 closed to 100 fully open

• 223P: QuantifiableActuatableProperty with Binary-Position on the hydronic reheat Valve; actuator and Role-Heating/topology identify the coil branch
• QUDT unit: PERCENT

brick:Valve_Position_Command and brick:Reheat_Valve are exact in Brick 1.4.4. PPR2.1 QuantifiableActuatableProperty, DimensionlessRatio, PERCENT, Binary-Position, Valve, and Role-Heating are exact; equipment role/topology is not serialized as a property aspect. Electric-reheat-only terminals cannot bind this point.

rht_coil_entering_temp

Air temperature immediately entering the hydronic reheat coil

• 223P: TemperatureSensor observes a QuantifiableObservableProperty of Fluid-Air at the reheat coil inlet ConnectionPoint: downstream of the SFPU fan or inside the PFPU fan/reheat branch
• QUDT unit: DEG_C

Brick 1.4.4 has only generic Air_Temperature_Sensor for this coil-local location. PPR2.1 temperature terms are exact, but series/parallel topology and the branch-local sensor attachment require deployment evidence. AHU SAT or plenum temperature is only a documented proxy when bias is characterized.

rht_coil_leaving_temp

Air temperature immediately leaving the hydronic reheat coil before downstream mixing

• 223P: TemperatureSensor observes a QuantifiableObservableProperty of Fluid-Air at the reheat coil outlet ConnectionPoint before downstream mixing
• QUDT unit: DEG_C

Brick provides only the generic class and PPR2.1 location is topology. For PFPU bind inside the fan/reheat branch before primary/branch mixing; mixed zone discharge is not equivalent unless a validated host Function derives the coil-leaving estimate. For SFPU bind immediately at coil outlet.

fan_airflow

Measured airflow through the terminal-fan path

• 223P: FlowSensor observes a QuantifiableObservableProperty of Fluid-Air at the terminal Fan path: PFPU secondary fan/plenum branch or SFPU series-fan flow path
• QUDT unit: L-PER-SEC

brick:Air_Flow_Sensor and PPR2.1 FlowSensor/VolumeFlowRate/L-PER-SEC/Fluid-Air are exact generic terms. Deployment topology identifies PFPU branch flow (ConnectionPoint Role-Secondary where applicable) or SFPU series-fan path. Do not bind total mixed discharge for PFPU. For SFPU, do not duplicate primary_airflow unless topology proves the same flow and the expected model remains independent.

fan_airflow_expected

Expected terminal-fan-path airflow at the current operating condition (host-fitted baseline)

• 223P: Host model represented as a Function whose hasOutput is a QuantifiableProperty for Fluid-Air VolumeFlowRate
• QUDT unit: L-PER-SEC

HOST-DERIVED SITE_FITTED baseline. Train on a known-good period, record model version/fit interval/error/update policy and inputs, and publish only while ready, fresh, and in-domain for fan command/speed, pressure, subtype, damper/topology, and operating state. Actual and expected must cover the same fan path. Brick has no exact expected-airflow point; PPR2.1 Function/hasOutput/QuantifiableProperty are exact but there is no exact predicted/expected aspect.

primary_airflow_reference

Independent or redundant host estimate of the terminal’s primary inlet airflow

• 223P: Independent host Function hasOutput a QuantifiableProperty for Fluid-Air VolumeFlowRate at the FanPoweredTerminal primary inlet
• QUDT unit: L-PER-SEC

HOST-DERIVED or redundant reference used only for sensor disagreement. Valid examples include a certified redundant sensor, independent calibrated damper/pressure model, or validated upstream branch balance. It must not consume primary_airflow or any direct transform of it; circular evidence guarantees agreement. Record derivation, inputs, same-stream/location proof, accuracy, readiness, domain, freshness, and time alignment. A physical redundant sensor may use brick:Supply_Air_Flow_Sensor instead of this derived form.

rht_delta_t_expected

Expected air-side temperature rise across the hydronic reheat coil at the current operating condition

• 223P: Host model represented as a Function whose hasOutput is a QuantifiableProperty for Fluid-Air TemperatureDifference
• QUDT unit: K

HOST-DERIVED SITE_FITTED baseline. Train on known-good coil operation and publish a positive value only while ready/fresh/in-domain for coil airflow, entering temperature, valve/full-heat state, and hot-water temperature/flow/pressure. Record model version, fit period, error, inputs, and freeze/update policy. Brick has no exact expected delta-T point; PPR2.1 Function/hasOutput/QuantifiableProperty and QUDT TemperatureDifference/K are exact, but no expected/derived aspect exists.