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TM_i-BX(-N)_NC05_00_06_20_EN
4.19
NIGHT FUNCTION
The function can be activated from a remote contact and can be used to decrease the unit noise by adjusting the number of revolutions of the inverter
compressor.
It is also possible to enable interruption of the function when the adjustment temperature deviates from the setpoint of a certain differential. The
function is restored when the adjustment temperature drops by an offset value.
The operation diagrams are given in the following charts.
ON
OFF
0521
Chiller activation
setpoint
0522
Interruption of the night function at the system exchanger in chiller
mode.
Differential, offset and resource limitation (inverter compressor revolutions) are defined by a parameter.
The inverter compressor revolution limitation acts as maximum compressor variation limit.
The temperature regulator will continue to adjust normally, while the compressor will be limited downstream the temperature regulator.
With the fan speed limitation based on the external air temperature, in chiller operating mode during the night the speed is always reduced.
The function will be available by setting digital input DI8 as "night limit" using parameter 019C.
The night limitation function forces the machine modulating components to a threshold that can be set using the parameter.
With the limitation active (through digital input), the devices are forced to the limits set using the above parameters.
All the machine protections maintain priority (PAP, defrost, pre-ventilation, etc.).
For the default values of the various parameters, see the parameters table
By default, the compressor is limited to operate at 50% of its maximum speed value (factory value).
The keypad shows the current rps speed of the compressor after the limitation.
MEHITS S.p.A.
●
TECHNICAL MANUAL
ON
T [°C]
OFF
Interruption of the night function at the system exchanger in heat pump
mode.
56
T [°C]
0524
Heat pump activation
setpoint
0523
Version NC05 - Translation of the Original Instructions
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