Is this normal HW behaviour?
Posted: Sat May 27, 2017 8:57 pm
I have just installed an Evohome installation controlling both heating and hot water.
The Evohome controller displays the HW temperature as registered by a thermostat transceiver (CS92) attached to a thermostat insertion sensor.
The sensor is inserted into dry socket in an unvented cylinder.
To test the Hot Water function, I started with a cool cylinder of water 30 Celsius.
The system had been installed 48 hours earlier so everything was at equilibrium temperatures.
The boiler is set to operate at 65 Celsius.
The hot water temperature for this test was set at 50 Celsius.
It took the boiler only 25 minutes to raise the cylinder of water from 30 to 50 Celsius.
My questions is about the temperatures that were displayed on the Evohome controller during this process.
The Evohome controller started out displaying a hot water temperature of 30 Celsius.
This displayed temperature did not update for 8 minutes whereupon it jumped to 36 Celsius.
This displayed temperature did not update for 10 minutes whereupon it jumped to 45 Celsius.
Thereafter the display updated in individual degrees until the temperature of 50 was reached and the boiler duly switched off.
Does anyone know how often the Evohome receives updates from the CS92 (or how often it polls for an update if it acts by polling the CS92)?
Has anyone observed this pattern of infrequent and large temperature jumps when the HW temperature is a long way short of the target temperature followed by frequent but small jumps as the target temperature is approached?
Can anyone explain how the HW temperature display should update?
Thanks
Francis
The Evohome controller displays the HW temperature as registered by a thermostat transceiver (CS92) attached to a thermostat insertion sensor.
The sensor is inserted into dry socket in an unvented cylinder.
To test the Hot Water function, I started with a cool cylinder of water 30 Celsius.
The system had been installed 48 hours earlier so everything was at equilibrium temperatures.
The boiler is set to operate at 65 Celsius.
The hot water temperature for this test was set at 50 Celsius.
It took the boiler only 25 minutes to raise the cylinder of water from 30 to 50 Celsius.
My questions is about the temperatures that were displayed on the Evohome controller during this process.
The Evohome controller started out displaying a hot water temperature of 30 Celsius.
This displayed temperature did not update for 8 minutes whereupon it jumped to 36 Celsius.
This displayed temperature did not update for 10 minutes whereupon it jumped to 45 Celsius.
Thereafter the display updated in individual degrees until the temperature of 50 was reached and the boiler duly switched off.
Does anyone know how often the Evohome receives updates from the CS92 (or how often it polls for an update if it acts by polling the CS92)?
Has anyone observed this pattern of infrequent and large temperature jumps when the HW temperature is a long way short of the target temperature followed by frequent but small jumps as the target temperature is approached?
Can anyone explain how the HW temperature display should update?
Thanks
Francis