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4.2 Heating settings
The Heating buffer sensor setting determines the heat source used by heating circuits: either the heat
pump's condenser or a buffer tank. Select other circuit equipment from each circuit's settings.
Heating buffer
sensor
Buffer
Start delay
Stop delay
Device settings → Service → Heating → Compressor (with buffer tank)
Heating setting
Start difference
Start limit
Stop difference
Stop limit
Charging difference
Charging setpoint
Minimum
temperature
M8004 2308EN
Device settings → Service → Heating
Not connected
The heat pump is connected directly to the building's heating system without a
buffer tank. No buffer tank sensor is connected. There can be an (unpowered)
instantaneous water cylinder, but not a buffer tank regulated by the heat pump.
Connected
The heat pump is connected to a buffer tank which is regulated by the heat pump.
The tank is equipped with a temperature sensor which is connected to the heat
pump. Any heating circuits in the system are connected to the buffer tank.
Buffer tank temperature.
Device settings → Service → Heating → Compressor (no buffer tank)
The compressor's start delay in space heating. Once the delay has elapsed, the
compressor will start.
● Typical setting, floor heating: concrete floors 120, wooden floors 80–60
● Typical setting, radiator heating: 80–40
● Increase the delay to extend the interval between starts and to have the
compressor run for longer at a time.
● The delay is properly set when room temperature stays even and the
compressor starts 2–3 times per hour.
The delay is based on degree minutes, and it applies when flow water temperature
is below its setpoint. Once the measured temperature is above the setpoint, the
delay will be reset.
● Delay calculation: flow setpoint – measured flow temperature.
The compressor's stop delay in space heating. Once the delay has elapsed, the
compressor will stop.
● Typical setting: approx. 5
● Increase the delay to have the compressor run for longer at a time.
● If the delay is greater than 0, flow water temperature can be above the setpoint.
The delay is based on degree minutes, and it applies when flow water temperature
is above its setpoint. Once the measured temperature is below the setpoint, the
delay will be reset.
● Delay calculation: flow setpoint – measured flow temperature.
Flow temperature determined by the heating curve.
This setting determines the threshold for starting the heat pump in relation to the
heating setting.
● Negative value: The setting determines how much the temperature in the buffer
tank needs to fall below the heating setting before heating starts.
● Positive value: The seting determines how much above the heating setting can
the temperature in the buffer tank be before heating starts.
The heat pump will start heating the buffer tank when buffer tank temperature falls
below this temperature (heating setting – start difference value).
The stop difference determines how many degrees above the start limit the buffer
tank will be heated.
Once the buffer tank temperature exceeds this temperature (start limit + stop
difference), the heat pump will stop heating the tank.
The amount by which the setpoint for the heating water used for heating the buffer
tank will be increased in relation to the stop limit.
The setpoint for the heating water which is used for heating the buffer tank.
The minimum buffer tank temperature regardless of any other settings or the heating
curve.
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