RDZ UMHPI, User Manual

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UMHPI
Industrial inverter air/water heat pumps with axial fans
20
For the models UMHPI 60, this function can be activated only with the presence of the optional “GI” module.
7.14 REMOTE FUNCTIONS
The terminal block provides two digital inputs for supervising the unit via an external consent.
7.14.1 ON/OFF
The ON/OFF function is already enabled by default. Remove the bridge of the terminal block then the unit will be placed in stand-
by mode (in such status the display of the on-board unit controller will show the "
E00 " item). When the contact is closed, the
machine exits from standby mode and the circulation pump will be activated for 2 minutes.
In order to change this function, you should enter into the parameters
PRG

PSS

PRG

(insert the service password)

PRG

Par

PRG

CnF.
See paragraph 11.2.
Parameter Unit Value Description Terminals Notes
H39 Num
2
(default)
Remote On/Off digital input ON - OFF Voltage free contact input
If the domestic hot water is enabled and the parameter “ H10” is set as below:
- If H10 = 1 . The remote on-off function does not have any effect on sanitary operating mode, it only disenables the heating and
cooling on the plant system side (in such case the code " SAN " will be shown on the display of the on-board unit controller).
- If H10 = 2 , the remote on-off function disenables the production of domestic hot water and the operation of the heat pump in
heating and cooling mode on plant system side.
7.14.2 SUMMER/WINTER MODE COMMUTATION
You can manage remotely the operating mode in heating or in cooling of the heat pump.
In order to enable this function, you should enter into parameters
PRG

PSS

PRG

(insert the service password)

PRG

Par

PRG

CnF.
See paragraph 11.2.
Parameter Unit Value Description Terminals Notes
H40 Num
3
(default)
Digital input for mode selection.
At Open/Closed Contact condition the
heat pump in set “heat”/”cool” mode.
DI3-DI3 Free voltage contact input
H76 Num 1 Selection of operating mode
7.14.3 SANITARY MODE CALL FROM DIGITAL INPUT
If the domestic hot water mode operation is enabled and the parameter used as alternative of the temperature sensor, the
activation of the domestic hot water operation can be performed through the opening/closing of a digital input of the unit. This
function is recommended in the case of utilization of two or more UMHPI units installed in cascade configuration and linked
through a hydronic connection to the same accumulation tank of domestic hot water; in this way the activation of the domestic
hot water function will be selected through the sensor of the accumulation tank connected to the first unit, while the other units
will be automatically enabled by a digital consent.
The system enters in domestic hot water mode when the digital input closes and the system quits it when the digital input opens.
In order to enable this function, you should enter into the page of parameters
PRG

PSS

PRG

(insert the service password)

PRG

PAr

PRG

CnF.
I/O Ports - Parameter Value Function
H54 128 Digital inputs polarities
*H44 28
Closed contact

Heat pump in DHW mode.
Open contact

Heat pump in heating or cooling mode of the environment (plant system
mode).
(*) Alternatively, it is possible to use another digital input, see paragraph 6.5.
- In the case where a digital input is configured for sanitary function call (as sensor’s alternative), the heat pump is will be placed
in sanitary mode when the digital input is closed and quits the DHW production when the digital input is open.
The
SAN setpoint is not considered because, its management should be done by the designer, who must take into account the
domestic hot water protection, (see paragraph 10.4) and the configuration of the whole system.
Note:
- You can reverse the polarity of the digital input, putting the maintainer (service) parameter to be H54 = 0 .