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3.6 Operation limits
(HA/HE versions)
70
60
50
40
30
20
-30
-20
-10
3.6.1 User heat exchanger water flow rate
The nominal water flow rate given is referred to a ∆t of 5 °C. Maximum flow rate allowed is the one that presents a ∆t of 3°C: higher values
may cause too high pressure drop.
The minimum water flow rate allowed is the one presenting a ∆t of 8°C.
Insufficient values cause too low evaporating temperatures with the action of safety devices which would stop the unit.
3.6.2 User hot water temperature (Winter operation)
Once the system is on temperature, the minimum user water temperature should not be less than 30°C.
Lower values could cause incorrect working operation of the compressor and compressor failure may occur.
The maximum user outlet water temperature cannot exceed 65°C; higher values may call the action of safety devices which would stop
the unit.
3.6.4 Ambient air temperature
The units are designed and manufactured to operate, In winter operation (heating mode ) from -20°C to 43°C.
In cooling mode the units can operate with ambient air temperatures from -10 to 43°C.
1
2
0
10
20
30
40
50
Ambient temperature (°C)
1
Heating mode
2
Heating mode with head pressure control (DCCF)
16
Rev. A 11-2020
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