Emerson Dixell iChill IC207D - PUMP DOWN BY TIME; UNLOADING; HIGH TEMPERATURE OF THE EVAPORATOR WATER INLET

1592015610 User manual IC200D EVO GB rel1.0 10.11.2015_rev10 IC200D 66/192
CO36 = 4 Pump down enabled during the switching off and switching on only in chiller mode (low
pressure probe)
The pump douwn procedure works as CO36=1 but only in chiller mode; in heat pump mode the solenoid
valve is activated when the first compressor is ON and de-.activated when the last compressor is OFF.
ATTENTION
If the pump down function is enabled, during the unit start-up from digital input as pump down
pressure switch and also from analogue input as low pressure transducer, the compressor will
restart only if both the inputs are satisfied.
21.3 PUMP DOWN BY TIME
The pump down can be enabled also by time; in this case the compressor is activated after CO58 from
solenoid valve switching on and de-activated after CO59 from solenoid valve switching off.
CO 58
Maximum time for the activation of the pump-down during the
switching off
CO58 = 0 Not enabled
0
250
Sec
CO 59
Maximum time for the activation of the pump-down during the
switching on
CO59 = 0 Not enabled
0
250
Sec
22. UNLOADING
22.1 HIGH TEMPERATURE OF THE EVAPORATOR WATER INLET
It is possible 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 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.
22.2 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 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