Earth Notes: 16WW Heat-pump Control

Updated 2024-12-06.
Settings and control of the heat pump at 16WW. #heatPump #controls #DHW #spaceHeat
Control settings and operation of the heat pump at 16WW, and changes to the regime, once it is installed!

Some current energy system settings are made available automatically.

Current Heat-pump System Settings

The defaults of 2024-11-29, with changes:

2024-11-29: Default Set-up from Daikin and Octopus

A summary of the basic 'defaults' for the EDLA04E2V3 system as produced by the Daikin MMI (Man Machine Interface) and the Octopus installation team, subject to my requests, as today:

  • No Madoka (wired remote control) fitted.
  • Space heating activated by external call for heat from Radbots via OpenTRV unit; no schedule is possible in conjunction with this unlike the old combi heating clock.
  • Radiator system pressure 1 to 1.5 bar on the mechanical gauge (the digital MMI value is lower, eg 0.9 in MMI vs 1.0 shown on the gauge).
  • Does not have the Thermino heat battery connected up.
  • The DHW cylinder immersion heater is driven from Eddi output 1 rather than the heat pump system, with a scheduled early Sunday morning boost ( (UTC) for 3h30) for pasteurisation, with the immersion heat thermostat set hot enough (5) for pasteurisation.
  • DHW on (with DHW priority): to .
  • Weather compensation for LWT/flow set to 50°C at -2°C external (design temp), 25°C at 12°C external (Daikin recommends defaults of external -7°C and 20°C end-points).
  • Space heat: space heating OFF temperature (breadcrumb 4.3): 22°C adjusted.
  • Space heat: pump operation mode (breadcrumb 4.5): request.
  • Tank: schedule (breadcrumb 5.5): to eco temperature daily as above adjusted.
  • Tank: disinfection (breadcrumb 5.7): no (because handled via Eddi).
  • Tank: maximum (breadcrumb 5.8): 60°C.
  • Tank: setpoint mode (breadcrumb 5.8): fixed.
  • Tank: heat up mode (breadcrumb 5.6): schedule and reheat.
  • Tank: comfort set-point (breadcrumb 5.2): 48°C.
  • Tank: eco set-point (breadcrumb 5.3): 45°C.
  • Tank: reheat set-point (breadcrumb 5.4): 43°C (minimum temperature: reheats from this when not otherwise covered by a schedule) adjusted.
  • Tank: hysteresis (breadcrumb 5.5): 8°C.
  • Sensors: external sensor (breadcrumb 9.8.1): outdoor.
  • Balancing: space heating priority (breadcrumb 5-02): disabled.
  • Balancing: anti-recycle timer (breadcrumb 8-02): 1h.
  • Balancing: maximum DHW running timer (breadcrumb 8-01): 45m.
  • DHW: pump installed (breadcrumb 9.2.2): no.
  • System: number of zones (breadcrumb 4.4): 1.
  • Main zone: emitter type (breadcrumb 2.9): fancoil (5KDT, rather than radiators).
  • Main zone: control (breadcrumb 2.9): external room thermostat.
  • Main zone: WD curve type (breadcrumb 2.5): 2-point.
  • Main zone: 2-point curve (breadcrumb 2.5): Y2=50°C, Y1=25°C, X1=-2°C (design temp), X2=12°C as above adjusted.
  • Setpoint range: heating minimum (breadcrumb 2.8): 25°C.
  • Setpoint range: heating maximum (breadcrumb 2.8): 55°C.
  • Setpoint range: thermostat type (breadcrumb 2.A): 1 contact.
  • Space heat: increase around 0°C: increase 2°C, span 4°C.
  • Space heat: overshoot: 4°C.
  • Space heat: antifrost: yes.
  • Main zone: delta T: 5°C.

2024-11-30: Proposed updates

  • Tank: schedule (breadcrumb 5.5): daily to eco, to comfort, to eco, reheat outside those times (default to eco temperature daily). However, times are in multiples of 10 minutes, and I could not set more than four actions per day, so daily eco, stop, eco, stop is used for now.
  • Space heat: space heating OFF temperature (breadcrumb 4.3): 15°C (default 22°C; to trim the nominal heating season closer to our usual).
  • Tank: reheat set-point (breadcrumb 5.4): 42°C (minimum temperature: reheats from this when not otherwise covered by a schedule) (default 43°C; lowered to reduce standing losses ~5%).