1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 67 of 149
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 HEAT PUMP MODE
When the evaporator probe (orcondenser pressure or condenser temperature) increase over CO46+CO47
the unloading function is disabled and all compressor are available to work.
Other information about the Unloading in Heat Pump
If the evaporator probe (or condenser pressure or condenser temperature) remains between CO46 and
CO46+CO47, after CO48 time the unloading function is deactivated.
29.3 Low Temperature Of The Evaporator Water Outlet
ACTIVATION
The lower value between the inlet evaporator probe, common outlet evaporator probe or outlet probe for the
circuit, enables the unloading function.
When the value of one of the probes above decrease under the set point CO55 the unloading function is
activated; the number of active compressors/step is determined by the CO49 parameter or CO96 speed in
case of inverter compressor.
The display shows the label
b1EU – b2EU
alternated to a default visualization.
DE-ACTIVATION
Unloading function is disabled when the temperature of all the probes configured rise over CO55 + CO56 or
when the CO57 time is elapsed.
30. SOLENOID VALVE FOR LIQUID INJECTION
It is possible to configure 2 valves for the liquid injection of the screw compressor (compressor 1 and
compressor 2).
When the
compressor is off
the solenoid valve
is always OFF
. When the compressor is on:
if the temperature detected by the probe mounted in the compressor increases over CO51 setpoint,
the valve is switched on
if the temperature detected by the probe mounted in the compressor decreases under C51-CO52
the valve is switched off.
31. EVAPORATOR WATER PUMP / SUPPLY FAN (AIR/AIR UNIT)
Water pump / supply fan operation mode:
CO16=0:
Not enabled: water pump/supply fan is not managed.
Attention:
The air / air unit configured with CO16= 0 does not manage the output for integration heaters.
CO16 = 1:
Continuous control
The water pump / supply fan is ON only if the unit is running (chiller or heat pump).
When the Ichill is switched on in chiller or heat pump, the water pump is immediately activated and the first
compressor is switched on after CO17 delay.
When the Ichill is in STD-BY or remote OFF the water pump is OFF (with a delay if CO18>0).
The parameter Ar09 allows to set the status of the water pump in case of antifreeze if the Ichill is in stand-by.
CO16
= 2:
on compressor demand
The water pump / supply fan is ON only if at least a compressor is ON; in case of compressor activation, the
water pump is switched on CO17 before the compressor.
