Parameter Meaning
CONST. FL. CIRC.
If TEMP DIFF CIRC. is set to the flow is continuous with this value in the heating
system. Value indicated in Volts.
Factory setting: 7V, range: 3V – 10V
MIN FLOW CIRC. Lowest permitted voltage (speed) of the circulation pump in the heating system.
Factory setting: 3V, range: 3V – 10V
MAX H.W CHARGE HW Highest supply temperature during water heating.
Factory setting: 55°C, range: 45°C – 65°C
MIN CHARGE. HW Lowest desired supply temperature during water heating.
Factory setting: 50°C, range: 30°C – 65°C
10.10 BUFFER TANK
Parameter Meaning
CONFIGURATION With integral control heating is produced according to the house's heating
demand. With tank control a fixed value is stated for the buffer tank.
Factory setting: INTEGRAL CONTROL, range: INTEGRAL CONTROL – TANK CONTROL
RET. LINE. HP SHUNT When the heat pump is inactive the heat is shunted from the buffer tank to the
heat pump at set temperature.
Factory setting: 25°C, range: 20°C – 30°C
SHUNT TIME RET.
Indicates shortest permitted time between control signals to the return line shunt.
Factory setting: 30S, range: 10S – 99S
TANK HYST. HP Indicates the number of degrees from the desired buffer tank temperature when
the heat pump must start to heat the buffer tank. A condition is that CONFIGURA-
TION = TANK CONTROL.
Factory setting: 4°C, range: 2°C – 20°C
TANK HYST. IMM Indicates the number of degrees from the desired buffer tank temperature when
the immersion heater must start to heat the buffer tank. A condition is that CON-
FIGURATION = TANK CONTROL.
Factory setting: 7°C, range: 2°C – 20°C
TANK HYST. EXT Indicates the number of degrees from the desired buffer tank temperature when
the external auxiliary heater must start to heat the buffer tank. A condition is that
CONFIGURATION = TANK CONTROL.
Factory setting: 10°C, range: 2°C – 20°C
62 – Installation instructions VMGFD102
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