管路防冻：在水温降到 2 °C 前开启远端细流并预警

自动化 YAML water-freeze-trickle-warning.yaml 复制

# HearthNodes recipe 23 - pipe freeze guard
alias: "Water - freeze guard trickles the far tap"
id: hn_water_freeze_trickle
description: "Warn at 4 C, trickle at 2 C, close after 15 minutes above 6 C"
mode: restart
max_exceeded: silent

trigger:
  - platform: numeric_state
    entity_id: sensor.exposed_pipe_temperature
    below: 4
    id: warn
  - platform: numeric_state
    entity_id: sensor.exposed_pipe_temperature
    below: 2
    id: trickle
  - platform: numeric_state
    entity_id: sensor.exposed_pipe_temperature
    above: 6
    for: "00:15:00"
    id: release

variables:
  tap: valve.far_tap
  trickle_lpm: 0.4
  max_runtime_h: 10
  wind_chill: >-
    {{ states('sensor.outdoor_temperature') | float(10)
       - (states('sensor.wind_speed_kmh') | float(0) * 0.12) }}

condition:
  - condition: template
    value_template: >-
      {{ states('sensor.outdoor_temperature') | float(10) < 1
         or states('sensor.forecast_overnight_min') | float(10) < -3 }}
  - condition: template
    value_template: >-
      {{ is_state('person.primary','home') or is_state('input_boolean.away_freeze_guard','on') }}
  - condition: template
    value_template: >-
      {{ (now() - states.sensor.exposed_pipe_temperature.last_updated).total_seconds() < 300 }}

action:
  - choose:
      - conditions:
          - condition: trigger
            id: warn
        sequence:
          - service: notify.mobile_app
            data:
              title: "Freeze risk"
              message: >-
                Exposed run at {{ states('sensor.exposed_pipe_temperature') }} C,
                wind chill {{ wind_chill | round(1) }} C. Trickle arms at 2 C.
      - conditions:
          - condition: trigger
            id: trickle
        sequence:
          - service: valve.open_valve
            target:
              entity_id: "{{ tap }}"
            data:
              flow_limit_lpm: "{{ trickle_lpm }}"
          - wait_for_trigger:
              - platform: numeric_state
                entity_id: sensor.exposed_pipe_temperature
                above: 6
                for: "00:15:00"
            timeout: "{{ max_runtime_h }}:00:00"
            continue_on_timeout: true
          - service: valve.close_valve
            target:
              entity_id: "{{ tap }}"
      - conditions:
          - condition: trigger
            id: release
        sequence:
          - service: valve.close_valve
            target:
              entity_id: "{{ tap }}"

# Pipe clamp failure -> fall back to outdoor below -2 C with wind above 15 km/h.
# Tap fails to open -> escalate the notification with instructions to open a tap
# by hand. Tap fails to close -> 30 minute maximum runtime plus a notification.