ECH 200 BD
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Diagram illustrating anti-freeze/supplementary electrical heater control
Power: power
Temp: temperature
8.5.6 External anti-freeze electrical heater control
Control is based on probe AI3 with a set point which may be set using parameter Pa r12 and a hysteresis of Pa r11.
Control is similar to that of internal electrical heaters.
8.5.7 Supplementary electrical heater control
If Pa r15=1 in heat mode, electrical heaters are activated on their control, and are activated even if AI1 < (SET Heating Pa
r14).
Control hysteresis is Pa C04 (hysteresis of heating control).
8.5.8 Boiler control
SUPPLEMENTARY BOILER:
The boiler is turned on in heating mode if outdoor temperature drops below Pa r13.
In this case the compressor and fan are turned off and heating is achieved using only the boiler.
The heat pump is turned back on if the outdoor temperature exceeds Pa r14+Pa r13.
If the boiler is working, temperature control is achieved using the boiler output; control is similar to compressor control in
HEATING mode.
BOILER IN HEATING MODE:.
Temperature control in heating is achieved using the boiler output, and is similar to compressor control in heat.ing mode;
The compressor and the external fan are turned off.
The boiler is turned off if:
• in cooling mode
• on stand-by or OFF
• there is a boiler shutdown alarm (refer to table of alarms)
Diagram
ON
OFF
Power
Temp (IA1/IA2/IA3)
Pa r11
Pa r07 (heating) o Pa r08 (cooling)
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