1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 66 of 149
29. UNLOADING
29.1 High Temperature Of The Evaporator Water Inlet
It is possibble to use this function if there are at least 2 steps of power (two compressor or 1 compressor with
partialization) for every circuit or with inverter compressor.
UNLOADING ACTIVATION
When the evaporator water inlet temperature is higher than CO40 for CO42 time, the display shows
and
the unit works with the number of compressors selected in CO49 parameter or CO96 speed in case of
inverter compressor.
EXAMPLE
2 circuits and 3 compressors per circuit
6 compressors are running; if CO49 = 2 in case of unloading 2 compressors are switched off and 4
continuous to work.
UNLOAD DE-ACTIVATION
When the evaporator water inlet temperature falls below CO40-CO41 the unloading function is disabled and
all compressor are available to work.
Unloading Information
If the evaporator water inlet temperature remains between CO40 and CO40-CO41, after CO43 time the
unloading function is deactivated.
29.2 Condenser High Pressure, Condenser High Temperature Or Evaporator Low
Pressure
UNLOADING ACTIVATION IN CHILLER MODE
When the condenser pressure or temperature is higher than CO44 the display shows
and the unit works
with the number of compressors selected in CO49 parameter or CO96 speed in case of inverter compressor.
If the compressor is a screw compressor the unloading function works at least CO50 time; if CO50 = 0 this
function is disabled.
EXAMPLE
2 circuits and 3 compressors per circuit
6 compressors are running; if CO49 = 2 in case of unloading 2 compressors are switched off and 4
continuous to work.
UNLOADING DE-ACTIVATION IN CHILLER MODE
When the condenser pressure or condenser temperature falls below CO44-CO45 the unloading function is
disabled and all compressor are available to work.
Other information about the Unloading in chiller
If the condenser pressure or condenser temperature remains between CO44 and CO44-CO45, after CO48
time the unloading function is deactivated.
UNLOADING IN HEAT PUMP MODE
The reference probe for this function is the evaporator probe; if any evaporator probe is configured, the
function uses the condenser probe.
When the evaporator/condenser pressure is lower than CO46 the display shows
and the unit works with
the number of compressors selected in CO49 parameter or CO96 speed in case of inverter compressor.
If the compressor is a screw compressor the unloading function works at least CO50 time; if CO50 = 0 this
function is disabled.
