Turn on the Heat
% start synopsis % start main
A heating controller for a hybrid system: a Solvis buffer and heating circuit, a heat pump, and a KWB pellet burner. Independent units on MoaT-Link compute the heating curve, pick the heat source, and drive the heat pump, the burner, the heating valve and the water pump.
% end synopsis
The controller consists of these units, each a separate MoaT-Link service:
| Unit | Role |
|---|---|
target |
heating curve and heat demand |
heat_valve |
heating circuit on/off |
flow |
the heat pump's water pump (PWM) |
pump |
the heat pump's state machine and load |
pellet |
the pellet burner's load and temperature |
selector |
which heat sources may run |
errors |
the heat pump's errors and their severity |
frost |
frost protection of the idle heat-pump loop |
passthru |
handing the heat pump to its original controller for maintenance, and back |
watchdog |
shuts the heat pump down when the pump unit dies (optional, on another host) |
moat dev heat run runs all units but the watchdog in one process;
moat dev heat run UNIT… runs some of them. Each unit waits until no
other process runs it, so a second instance is a hot standby. The
units read their sensors from, and write their commands to, the Modbus
pollers (moat modbus dev poll) of the heat pump and the Solvis
controller; moat dev heat pwm drives the water pump's PWM output, and
moat dev heat modbus_mon restarts a stuck Solvis poller. The package
moat-dev-heat-service has systemd units for all of these.
Other commands:
moat dev heat stopstops the units in an orderly way: the heat pump is switched off and cooled down before the water pump stops.moat dev heat offshuts the heat pump down at once (emergency).moat dev heat overridesets or clears an operator override, e.g. to keep the heat pump off.moat dev heat migrateconverts the legacy controller's configuration and state to the units' MoaT-Link items (once).moat dev heat recordrecords MoaT-Link data for tests.moat dev heat sim, in the separatemoat-dev-heat-simpackage, runs a plant simulator on MoaT-Link.
The units' configuration lives in MoaT-Link (cfg.app.heat.UNIT),
overlaid on the package defaults, and takes effect without a restart.
Safety depends on the flow unit: an emergency shutdown, whether by
the pump unit, the watchdog or moat dev heat off, asks the flow unit
to keep the water running until the heat pump has cooled down. If the
flow unit is dead too, the water pump keeps its last PWM. That protects
the heat pump from overheating, but nothing stops the water pump
afterwards.
% end main
1 maintainer
Metadata
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Release files for moat-dev-heat 1.0.0
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