Earth Notes: 16WW Heat-pump Control
Updated 2024-12-09.Settings and control of the heat pump at 16WW. #heatPump #controls #DHW #spaceHeat
Control and operation of the heating system at 16WW (heat pump, heat battery and diversion/boost), with a note of changes, and initial default settings.
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 8 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).
Cheat Sheet if Something Goes Wrong
If for some reason the heat pump goes wrong and there is no hot water or heat, try these things in this order:
- Take a note of any alarm showing on the heat pump MMI display by the hot water tank.
- Turn the heat pump off for at least 10 minutes at the "main switch" in its separate panel by the front door, then back on.
- If necessary use a fan heater to keep one room warm.
- Ensure that the Eddi rocker switch is "on" and select "boost" for heater 1 on the Eddi front panel: one hour may be enough for a shower or two hours for a bath; feel exposed metal on pipes at the top of the tank to get an idea of water temperature.
- If the Eddi does not seem to be heating the tank (with blue light "1" on) then turn the Eddi rocker switch to "bypass" to try to force some hot water, but please put the switch back to "on" when done.
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 of 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 (OpenTRV/Radbot, per-TRV call for heat, nominal maximum 6°C setback in vacant/dark rooms).
- 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%).
2024-12-09: Pasteurised
The grid-aware pasteurisation cycle kicked in this morning, during 'super-green' and 'L' time, lasting a little under 2h and consuming 2.7kWh, 8 days since the last time the cylinder reached maximum temperature.
The Daikin MMI was reporting the DHW to be 60°C at ~.
Heat battery log sample:2024-12-09T00:01Z MT 0 GI 62 IT 76 F WLGQbvxN ES - 2024-12-09T00:11Z MT 0 GI 62 IT 76 F WLGQbvxsN ES 1 2024-12-09T00:21Z MT 0 GI 62 IT 76 F WLGQbvxsN ES 4 2024-12-09T00:31Z MT 0 GI 62 IT 76 F WLGQbvxsN ES 4 2024-12-09T00:41Z MT 0 GI 62 IT 76 F WLGQbvxsN ES 4 2024-12-09T00:51Z MT 0 GI 62 IT 76 F WLGQbvxsN ES 4 2024-12-09T01:01Z MT 0 GI 63 IT 76 F WLGQbvxsN ES 4 2024-12-09T01:11Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 4 2024-12-09T01:21Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 4 2024-12-09T01:31Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 4 2024-12-09T01:41Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 4 2024-12-09T01:51Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 4 2024-12-09T02:01Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 4 2024-12-09T02:11Z MT 0 GI 67 IT 76 F WLGQbvxsN ES 4 2024-12-09T02:21Z MT 0 GI 67 IT 76 F WLGQbvxsN ES 4 2024-12-09T02:31Z MT 0 GI 65 IT 76 F WLGQbvxsN ES 5 2024-12-09T02:41Z MT 0 GI 66 IT 76 F WLGQbvxN ES 5 2024-12-09T02:51Z MT 0 GI 66 IT 76 F WLGQbvxN ES 1
