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PiHome - Smart Heating, Ventilation and Air Conditioning (HVAC)
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Zone hysteresis #427

Open sandreialexandru opened 3 years ago

sandreialexandru commented 3 years ago

Zone hysteresis value is not calculated by boiler.php. Having zone and boiler hysteresis is redundant and I suggest deleting column in zone_sensors table and from the GUI.

sandreialexandru commented 3 years ago

Same logic applies to Maximum Operation Time

pihome-shc commented 3 years ago

same comments as Adding boost #426 re: zone hysteresis and max running time. if we dont see this any useable we can delete them.

sandreialexandru commented 3 years ago

Zone hysteresis is redundant with boiler hysteresis. Let's say that a zone runs for 60 minutes, then the boiler stops. Another zone requires heating in the next 3 minutes but boiler won't start untill the hysteresis passes. Zone hysteresis would only be valuable if only one zone is used.

Setting hysteresis for zones doesn't matter as long as boiler could run continuously for different zones. Hysteresis is a boiler property, by definition.

pihome-shc commented 3 years ago

good point, i was thinking in frost protection mode boiler will run indefinitely, may be we need to introduce some time limit on frost protection then, and drop zone hysteresis and zone max operation time. what other think?

sandreialexandru commented 3 years ago

What if time ends for frost protection? Then no protection would occur. Taking a look at other thermostats I see no time limit for frost protection. The logic is that water will not freeze if 2°-3°C are above the set temperature, not to mention that the water circulating in the system will have 60°C or more.

pihome-shc commented 3 years ago

i was thinking to make system more intelligent, i.e if boiler is running for while and there is not temperature change then something else is wrong and shutdown the frost protection and one way could be offer time limit for boiler run for frost protection mode or check if temperature is not changing after 10 15 minuts

sandreialexandru commented 3 years ago

Nevertheless zone hysteresis and zone maximum operation time are not needed in my opinion. Those properties are for boiler only.

pihome-shc commented 3 years ago

Agree, one second thought @twa127 have you used maximum operation time for non heating zone?

twa127 commented 3 years ago

Hi,

No I don't think it is used anywhere

pihome-shc commented 3 years ago

then its safe to remove as hysteresis and zone maximum operation time are not needed

pihome-shc commented 3 years ago

@sandreialexandru any further action required? can we close this issue?