Earth Notes: 16WW Heat-pump Control
Updated 2024-12-06 09:26 GMT.By Damon Hart-Davis
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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:
- The DHW cylinder immersion heater is driven from Eddi output 1 rather than the heat pump system, on a grid-sensitive 7 to 14 day interval generally starting at midnight when it runs, with the immersion heat thermostat set hot enough (5) for pasteurisation (no longer on fixed Sunday-morning slot; changed 2024-12-05).
- Weather compensation for LWT/flow set to 50°C at -2°C external (design temp), 25°C at 15°C external (living room was not reaching 21°C when mild outside ~14°C and curve RHS set for 25/12; changed 2024-12-01).
- 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%; changed 2024-11-30).
- Space heat: space heating OFF temperature (breadcrumb 4.3): 15°C (default 22°C; to trim the nominal heating season closer to our usual; changed 2024-11-30).
- Tank: schedule (breadcrumb 5.5): daily eco, stop, eco, stop, reheat outside those times (default to eco temperature daily; changed 2024-11-30).
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%).