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HP_OWER ONE 140R - 140RK - 160RT -160RTK – 180RT - 180 RTK
15 OPERATING LIMITS
15.1 EVAPORATOR WATER FLOW RATE
The 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 cas
es, 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
70R-70RK 90R-90RK 120R-120RK 140R-140RK
assured in chiller mode (condition
(2) technical sheet) [l/s]
0,15 0,17 0,25 0,34 0,34 0,41
assured in chiller mode (condition
(2) technical sheet) [l/s]
0,40 0,46 0,68 0,92 0,92 1,10
Minimum flow switch water flow
rate* [l/s]
0,117 0,117 0,153 0,153 0,262 0,262
Maximum flow switch water flow
rate* [l/s]
0,132 0,132 0,175 0,175 0,293 0,293
Performance referring to the following conditions:
(2) Cooling: outdoor air temperature 35°C; in/out water temperature 12/ 7°C.
* 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.
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