Picco R32
Inverter air/water heat pumps with axial fan
38
12.2
UNIT AND AUXILIARY ELECTRICAL DATA
Unit power supply
V/~/Hz
400/3PH+PE/50
On board controller circuit
V/~/Hz
12/1/50
Remote controller circuit
V/~/Hz
12/1/50
Fan power supply
V/~/Hz
400/3PH+PE/50
NOTE: The electrical data are subject to change due to updates. It is therefore always necessary to refer to the technical specifications label
applied on the right side panel of the unit.
13. OPERATING LIMITS
13.1
EVAPORATOR WATER FLOW RATE
he nominal water flow rate refers to a 5°C temperature difference between the evaporator inlet and outlet. The maximum permitted flow rate
features a 3°C temperature difference while the minimum one has an 8°C temperature difference at the nominal conditions as shown in the
technical sheet.
Insufficient water flow rates can cause excessively low evaporation temperatures causing the safety devices to trigger and
stopping the unit and, in some extreme cases, forming ice in the evaporator and resulting in serious failures to the cooling
circuit.
For greater details, we have attached a table below with the minimum flow rates for the plate heat exchanger to guarantee proper operation
according to the model (please note: the water flow switch is applied to protect against failed triggering of the antifreeze probe due to the lack
of flow but does not guarantee the minimum water flow rate required for correct operation of the unit).
Model
Heat pump
140
250
260
270
Minimum water flow to be assured in chiller mode (condition (1) technical sheet) [l/s]
0,9
1,1
1,4
1,6
Maximum water flow to be assured in chiller mode (condition (1) technical sheet) [l/s]
2,4
2,9
3,8
4,2
Minimum flow switch water flow rate* [l/s]
0,56
0,77
0,92
0,92
Maximum flow switch water flow rate* [l/s]
0,58
0,80
0,95
0,95
* When the flow rate drops below the indicated limit (flow switch minimum water flow rate) the flow switch issues an alarm, which may be reset
only upon reaching the maximum indicated flow rate.
13.2 COLD WATER PRODUCTION (SUMMER MODE)
A minimum temperature of 5°C is allowed at the evaporator outlet for standard units. For BT units (low temperature) minimum temperature is
-8°C. In this case glycol water must be used. A maximum temperature of 20°C can be maintained at the evaporator outlet in steady-state oper-
ation.
13.3 HOT WATER PRODUCTION (WINTER MODE)
When the system has reached steady state, the water inlet temperature must not drop below 20°C: lower values, not due to transient phases
or reaching steady-state, can cause system failures and could possibly break the compressor. The maximum outlet water temperature must not
exceed 58°C. Temperatures higher than those indicated, especially in conjunction with low water flow rates, could result in malfunctioning of
the unit, or in the most critical cases safety devices could be triggered.
13.4
AMBIENT AIR TEMPERATURE AND SUMMERISED TABLE
The units are designed and built to operate in summer mode, with condensation control, at outdoor air temperatures between -10°C and 46°C. I
heat pup mode, the allowed temperature range of the outdoor air is from -19°C to +39°C depending on the outlet water temperature as shown
in table below.
Operating limits
Water chiller mode
Room temperature
Minimum -10 °C
M46 °C
Water outlet temperature
M5°C
M20°C
Room temperature BT version
Minimum -10 °C
M46 °C
Water outlet temperature BT version
Minimum -8 °C
M20°C
Heat pump mode
Room temperature
Minimum -19 °C
M20°C
Outlet water temperature
M25 °C
M58 °C
Heat pump mode for domestic hot water 140 / 270
Room temperature with water at m58 °C
Minimum -8 °C
M24 °C
Summary of Contents for Picco R32-140
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