Metro Therm Microbooster P, Manual

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Note: the unit can be turned off switching to HOLIDAY mode.
Code Set point name Description
P1 AUTO The heat pump heats the water when required using the heat pump
operation. Under normal conditions, the compressor works until A1
T AUTO set point is reached. If the source temperature is below D7
Source T min, the electric heater starts and the heat pump shuts-
off. Hysteresis can be changed in the installer menu D35 (Water
hysteresis).
P2 ECO The heat pump consumes as little energy as possible. The heat pump
operates at a lower water temperature set point A2 (T ECO). Hyster-
esis can be changed in the installer menu D35 (Water hysteresis).
P3 BOOST The heat pump and the electrical heater operate simultaneusly when
possible (interim mode is forced from the beginning of the heat up
cycle). If D28 (T HP max) is greater than A3 (T BOOST) the compres-
sor stops at the temperature setpoint D28 (T HP max), otherwise the
compressor stops at A3 (T BOOST).
P4 BACKUP This is an emergency mode. In BACKUP mode the water is heated up
by the electric heater at a lower temperature than the desired one.
The Legionella control is active in any case.
P5 HOLIDAY The heat pump is turned off and only the LCD display is active.
The heat pump does not start when water heating is required. The
compressor is OFF exept during LEGIONELLA control in which it can
be activated. The HOLIDAY mode is connected to B3 (Hot on time)
function. After the B3 (Hot on time) timer is over, the unit goes back
to the previous mode of operation.