Hi guys, I see there are a few Grant threads already but wasn’t sure on forum etiquette for starting a new thread vs hijacking an existing one
I’ve had the heat pump for a few days now and have a few questions
First some info, I have the Grant heat pump, Grant DHW cylinder (not pre-plumbed due to concerns about it fitting into the cupboard) and the Aerona Smart Controller.
It’s on panel version S024.24 & controller version S024.29 - if anyone could provide the update files, if there are any newer, that would be great!
Flow rate
My flow rate never seems to drop below 13.33L/min, even when the compressor and fans are off. I went into the service menu (1234) and set the Standby Pump Speed to 0 (and the Minimum Pump Speed to 20) but my changes seem to be reverted instantly.
Is it a problem that the pump is always running, no matter what? It seems pointless to be running it if the heat pump isn’t doing anything.
When it’s actively heating the flow rate is more like 18-23L/min, with a delta T of around 3c. I would like to try experiment with a lower flow rate, but as I mentioned my changes to those settings are ignore/instantly reverted. I’ve tried changing via the econet24 web interface and the smart controller touch screen, same result
Right now, the heat pump is doing nothing and has a flow rate of 15L/min
Heating demand
No matter what, on the smart controller touch screen the red heating demand icon is active (even if the compressor/fan are off). On the econet24 web interface it says the demand is heating, work state is on, but compressor/fans are at 0
So far my configuration is this
User Parameters
Work modes
Work mode: Winter
Heat pump work mode: On
Silent mode: Schedule (schedule is all day every day, may change this in winter if required)
Silent mode level: Level Two
Circuit 1 H1
Hysteresis: 0.3°C
Circuit H1 operation mode setting: Day mode
Preset day temperature: 19.0°C
Preset night temperature: 18.0°C
Heating curve: 0.9
Heating curve - shift: -2
Boost time: 0min
Service Parameters
Weather sensor
External temp. sensor support: YES
Temp. sensor source: ecoMULTI
Summer mode activation temperature: 19°C
Winter mode activation temperature: 17°C
Hydraulic scheme: Direct (there’s a 50L volumiser)
Main heat source
Cooling support: NO
Heat pump lock: NO
DHW temp. correction: 5°C
Circuit temp. correction: 1°C
Manual defrost: OFF
Reboot the unit: OFF
Purge function: OFF
Purge power: 100%
Circuit crit. temp ignore after DHW: 1min
DHW settings
DHW support: YES
Off circuits during charging: YES
DHW recirculation settings
Recirculation support: NO
Circuit 1 H1
Circuit support: YES
Circuit type: Radiators
Regulation method: Weather
Work mode: Day mode
Decreasing fixed water temperature: 3°C
Heating curve: 0.9
Heating curve - shift: -2
Room temperature correction: 2.0
Thermostat pump blockade: NO
Off circuits during charging: YES
I have been experimenting a bit with Room temperature correction, moving between 0, 2 and 4 but I can’t really seem to work out what it’s doing in reality.
My understand (please do correct me if I’m mistaken) is that with Thermostat pump blockade set to off, the heat pump won’t just shut off when the target temperature is achieved, but will instead decrease the flow temp. by whatever Decreasing fixed water temperature is set to. Only when the flow temp falls below some value (?) will the heat pump stop working.
I’m really not sure what the Room temperature correction does in this scenario. At 0 it’s presumably off entirely, so does it just completely ignore the thermostat? Or does it still use the thermostat value to reduce the flow temp as I outlined in the paragraph above?
My goal is like what many of you strive for, to have the heat pump cycle as little as possible and work ‘low and slow’ to maintain and consistent temperature in the house. Please, if you have any advice on settings I can change to achieve this I’m all ears.