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Parameters of solid fuel fired boiler B
In case of solid fuel fired boiler it is possible to set max. temperature of boiler pump deactivation (below, to the left). Setting
within 10-85°C is possible (factory setting: 65°C). This parameter allows protecting the tank against excessive pressure increase
and too high water temperature in the tank.
The second parameter is minimum boiler pump start-up temperature depending on the T4 temperature at boiler outlet (setting
within 30-60°C, factory setting: 45°C).
Another parameter is the temperature difference for boiler pump activation, set at factory to 8°C (possibility to change the setting
within 5-15°C). This parameter refers to the difference between sensor T4 (boiler outlet), and sensor in the tank at the coil of
solid fuel fired boiler T3 (except of diagram no. 8, where solid fuel fired boiler is connected to upper coil and controlled by sensor
T2). The boiler pump will receive signal to activate, when both conditions are satisfied at the same time, that is temperature T4
is higher than preset value, and temperature difference between the boiler and the tank is higher than preset value.
The last item in this list is the priority of heating with solid fuel fired boiler (below, to the right). If YES value is set and conditions
required for boiler pump activation are fulfilled, all other pieces of equipment operated by the controller (heat pump, heater,
automatic boiler) will switch off, even is they are currently in operation. The priorities are connected with reaching possibly
highest efficiency and economy of the HUW boiler-room system, depending on existing conditions.
Operation parameters of automatic boiler D:
These settings concern gas-fired boiler or another automatically controlled boiler. Analogically to solid fuel fired boiler, the first
parameter allows setting maximum temperature for boiler deactivation (applicable in the case, when heat pump is off or does
not work due to an alarm). In case of parallel operation of heat pump and gas-fired boiler (boiler stoppage during heat pump
operation set to NO) - automatic boiler will keep heating up only to HUW temperature required for the heat pump - heat pump
hysteresis. For example, if heat pump activates for temp. 45°C and heats water to 50°C, then automatic boiler will be heating up
water only to 45°C, provided that it drops to lower value before. It is also one of possibilities of the so-called PARTY mode – in
case of higher demand for hot utility water, besides heat pump it will be also heated up e.g. by gas-fired boiler.
