37
DESCTIPTION OF COMPONENTS
GB
GB
GB
GB
8. LOGIC OF OPERATION
Set point 2 climatic curves (to power the fan coils)
If the second set point is activated, via the closing of the "Set-point 2"
contact (terminals 13 - 14 PCB TERMINAL BLOCK,, the temperature of the
requested water from the heat pump is calculated through a further two
climatic curves, a winter one and a summer one. These climatic curves are
built on the same external temperatures, minimum and maximum, set for
the previous curves
(parameters 210, 211, 217, 218)
.
Whereas, the water temperatures are settable on the following parame-
ters:
For the winter climatic curve:
- 215:
Minimum outlet water temperature (default 45°C)
- 216:
Maximum outlet water temperature (default 45°C)
For the summer climatic curve:
- 222:
Minimum outlet water temperature (default 7 °C)
- 223:
Maximum outlet water temperature (default 7°C)
8.7 Inverter frequency modulation
The output signal from the SMART-MT controlling the inverter frequency,
is based on the error between:
- temperature of the requested water from the heat pump (parameter
231
):
• in air conditioning, it is calculated according to the active climatic curve
• in DHW production, it is set through parameter
128
.
- temperature of the delivery water from the heat pump (parameter
109
).
Note:
The output signal from the SMART-MT
parameter 235
represents the re-
quested inverter frequency; the power supply frequency of the compressor
is further controlled by the PCB-MAIN of the heat pump, according to com-
pressor operational limits.
8.8 Outdoor air temperature sensor
To correctly regulate the outlet water flowing temperature to the heat
pump, it is important for the external air temperature to have a significant
value and not be influenced by an incorrect positioning of the sensor.
The heat pump has an "External temperature" sensor found on the opposite
side of the fan, near the finned heat exchanger.
If this position is not significant, another remote probe can be connected to
the unit; this variation requires the following operations:
- purchase the “SAER” accessory (external air remote probe)
- disconnect connector “Air. Ext. S.” and connect the SAER in clamps 1 and
2 of the “PCB Terminal Block” as shown in the following figure.
8.9 Storage DHW heating
The eventual availability of DHW through connection of the HP to a specific
DHW storage, is automatically managed through the SMART-MT and a
specific DHW temperature sensor located in the DHW storage.
The request for DHW can occur in the following ways:
Par 123=0
Connecting a 10k
Ω
temperature sensor at 25 ° C (Cod. 0724510)
between clamps 5-6 of the PCB-TERMINAL BLOCK. In this instance the
production will stop once the set point temperature is reached, defined by
parameter 126, and will resume when the water temperature will have a
value less than par. 126 – par. 127
Par 123=1
DHW request if between terminals 5-6 of the PCB-TERMINAL
BLOCK there is a closed contact. With this solution one should install a
thermostat, with a contact open to a satisfied set, to the aforementioned
clamps.
Par 123=2
DHW request if between terminals 5-6 of the PCB-TERMINAL
BLOCK there is an open contact. With this solution one should install a
thermostat with a contact closed to a satisfied set, to the aforementioned
clamps.
If setting of Parameter
112=ON
(default value), with DHW request, a
powered output “3W.V.SANITARY” activates (clamp H, PCB TERMINAL
BLOCK) and Pump 1 will activate when the delay time set in parameter
130
will have lapsed.
Nota:
The demand for DHW has priority on air conditioning. To limit the priority
of DHW on air conditioning, according to a daily time band, contact an
authorized service centre. In addition, a thermal disinfection system for the
storage of domestic hot water (DHW) is not active.
To activate the scheduled thermal disinfection for DHW storage, contact
the approved service centre.
SAER
Note:
The maximum distance the installation of the outdoor air temperature sensor is 30 m
Summary of Contents for Mirai SMI EH0614DC
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