MAXA i-HPV5H 0140, Manual

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Controllo per i-HPV5
Chillers and Inverter Air/Water heat pumps with axial fan
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NOTE: defrosting during winter operation is always performed on the user side, never on the domestic hot water tank.
12.2.1 MEMORISING THE PROBE IN HEATING MODE
When switching from the system to DHW, the reference probe changes from "water outlet probe" to "DHW probe". The display on the machine
shows the temperature read by the probe located inside the DHW tank; once the DHW cycle is over, the display returns to show the water outlet
temperature. In heating mode, before entering DHW mode, the last value read by the flow probe of the heat pump is memorised. Once the DHW
temperature control is satisfied, the reference temperature on the system side returns to the previously memorised one.
The memory function is interrupted:
• when the temperature read by the probe becomes lower than the stored value;
• or a time equal to b06 seconds has elapsed (default b06 = 45).
12.2.2 HEATING MODE ON DHW STORAGE TANK
If parameter H130 = 1 , the machine also uses the DHW storage tank for heating on the system side. Under these conditions, the DHW valve
output is also active during hot operation. The valve is deactivated during defrosting and in cold mode. In this mode (H130 = 1) it is possible to
make the domestic hot water integration resistor also act as integration resistor on the system side.le to make the DHW integration resistor also
act as an integration resistor on the plant side.
13. REMOTE FUNCTION
The terminal block has digital inputs to control the unit via an external consent (see chapter "5. SYSTEM RESOURCES").
13.1 ON/OFF
The function is enabled by default on digital input DI3 (parameter H47 = 2 ), to activate it, the electrical bridge must be removed from the terminal
block. With the contact open, the unit will be in stand-by mode, in this state the message E00 will appear on the display on the machine. When
the contact is closed, the machine comes out of stand-by and the circulator is activated for 2 minutes.
The function is disabled by reinserting the electrical bridge or setting parameter H47 = 0.
NOTE: If the remote off command is activated during defrosting, the unit finishes defrosting and then switches to OFF mode.
13.2 SUMMER/WINTER MODE CHANGE
The control offers the possibility to remotely manage the operating mode of the machine in heating and cooling mode. The function can be set
on digital input is settable D12 via parameter H46 :
Parameter VALUE Function
H46
0 (default) Function disabled
3
Open contact -> cooling mode
Closed contact -> heating mode
The polarity of the digital input DI2 can be reversed by setting H75 = 2.
13.3 DHW CALL DROM DIGITAL INPUT
If DHW operation is enabled and parameter H53 = 28, is set, as an alternative to using the DHW temperature probe (H17 = 0), the DHW function
can be activated by closing/opening digital input DI7. The unit goes into DHW mode when the contact closes and exits DHW production when
the contact opens.
NOTE: this function is not activated if the double set-point management is used.
This function is recommended when using two or more heat pumps in cascade, hydronically connected to the same domestic hot water storage
tank. In this case, the activation of the domestic hot water function can be set on the first machine via the DHW probe of the tank, while the
other machines are automatically enabled thanks to the consent given by the digital input.
CAUTION: The SAN setpoint of the heat pump is not considered; management of this setpoint is delegated to the designer,
who must take into account the DHW protection and the configuration of the entire system.