MAXA HWA1-A 0140, Manual

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HWA1-A
Air/water chillers with axial fans
12
8.3 Operation under thermoregulator call with periodic activation
The function is disabled if P17= 0 (default). If the pump is set to operate by thermo-regulator actuation ( P03 = 1 , default), it will be
activated periodically for a duration given by the parameter P17 (in seconds) after a counting time set by the parameter P16 (in
minutes), activated when the thermoregulation is fulfilled and the pump turned off.
In case of activation of the flow switch alarms with automatic reset the pump is still ON even if the compressor is off.
The periodic function is interrupted also in case of intervention of the antifreeze thermo-regulator which leads to the forced
operation of the pump.
8.4 Hydraulic pump in anti-freezing operation
If the setting temperature is too low and the pump is off, the pump will be activated automatically.
Pa
P04 set antifreeze pump activation
Pa P05 hysteresis pump in antifreeze
8.5 Continuous operation
In this mode of operation (active if P03 = 0), the pump is always ON. It turns off only when the unit stops to operate.
8.6 Linear regulation of the circulator – double ΔT
Water
–
The analog output varies according to difference in temperature between water inlet and water outlet of the heat exchanger.
•
P06 set ΔT
Water inlet/outlet
of modulating pump in heating mode
•
P07 maximum speed of the modulating pump
•
P08 minimum speed of the modulating pump
•
P09 set ΔT
Water inlet/outlet
of the modulating pump in cooling mode.
•
P10 Modulating pump linear band
−
In cooling mode: [T
Water inlet
] – [T
Water outlet
]
−
In heating mode: [T
Water outlet
] – [T
Water inlet
]
ON
OFF
Sonda regolazione
Set antifreeze o pompa P04
P05