Emerson X-web300 Manual de usuario descargar pdf (Pagina 71)

1592015300 User manual iCHILL 200 L GB r1.3 09/09/2005

30.4 UNLOADING WITH PRESSURE, CONDENSING TEMPERATURE OR EVAPORATING

PRESSURE CONTROL

The function is always enabled for both the running mode in order to reduce the load and helps the unit to start: in chiller for high

temperature of the external air to avoid high pressure alarms, in heat pump for low temperature of external air to avoid the low pressure

alarms.

The compressor unloading in chiller mode is managed by the analogue input configured as condenser probe circuit 1 or 2 and

determined by CF07 (0=temperature, 1 = pressure)

The compressor unloading in heat pump mode is managed by the analogue input configured as evaporator probe circuit 1 or 2. If not

configured the heat pump unloading is managed from the condenser transducer.

30.5 REGULATION

UNLOADING IN CHILLER MODE

When the chiller thermoregulation request begins to start the compressors, if the condenser pressure/temperature is equal or bigger

than CO44 setpoint the unloading process, of that circuit probe, is engaged. The bottom display shows, alternated with the

measurement, the b1Cu or b2Cu labels. The number of active compressors/step is determined by the CO49 parameter.

EXAMPLE

Unit with 2 circuits with 3 compressors each.

If Par. CO49 = 2, 2 power steps per circuit, in case of unloading there will be 4 compressor running.

With capacity compressors and with unloading active, to avoid having a not well balanced circuit after reducing the power (step valve

on) the resource (the valve) is activated for the time set in CO50 even if the unloading function is not more activated and the

thermoregulation requires 100% of power. If CO50=0 the function is disabled and if necessary the valve is turned immediately off to

have the 100% of the power.

UNLOAD DE-ACTIVATION in CHILLER MODE

If the temperature decreases under the value determined by (CO44-CO45) setpoint – differential, the unloading is disengaged, the

compressors are all available for the thermoregulation.

30.6 OTHER INFORMATION ABOUT THE UNLOADING IN CHILLER

To avoid having long period of unloading function activated when the temperature or the pressure value is continuously within the SET

and SET+ differential, if the temperature or the pressure is higher than CO40, the CO48 time delay forces the unloading off for timeout

even if the temperature / pressure is not lower than CO44-CO45.

UNLOADING IN HEAT PUMP MODE

The compressor unloading in heat pump mode is managed by the analogue input configured as evaporator probe circuit 1 or 2.

When the heat pump thermoregulation request begins to start the compressors, if the evaporator pressure/temperature is equal or

bigger than CO46 setpoint the unloading process, of that circuit probe, is engaged. The bottom display shows, alternated with the

measurement, the b1Cu (crcuit2)or b2Cu (crcuit2)labels. The number of active compressors/step is determined by the CO49

parameter.

EXAMPLE

Unit with 2 circuits with 3 compressors each.

If Par. CO49 = 1, 1 power steps per circuit, in case of unloading there will be 2 compressor running, 1 per circuit.

With capacity compressors and with unloading active, to avoid having a not well balanced circuit after reducing the power (step valve

on) the resource (the valve) is activated for the time set in CO50 even if the unloading function is not more activated and the

thermoregulation requires 100% of power. If CO50=0 the function is disabled and if necessary the valve is immediately off to have the

100% of the power.

UNLOAD DE-ACTIVATION in HEAT PUMP MODE

If the evaporator temperature increases the value determined by (CO46+CO47) setpoint +differential, the unloading is disengaged, the

compressors are all available for the thermoregulation.

30.7 OTHER INFORMATION ABOUT THE UNLOADING IN HEAT PUMP

To avoid having long period of unloading function activated when the temperature or the pressure value is continuously within the SET

and SET+ differential, if the temperature or the pressure is higher than CO46, the CO48 time delay forces the unloading function off for

timeout event, even if the temperature / pressure is not lower than CO46+CO47.

31 SOLENOID VALVE FOR LIQUID INJECTION

There are two outputs relay that can be configure as solenoid valve compressor 1 and 2. The function is enabled when:

• For compressor 1: one output relay is configured as solenoid valve compressor 1 and one analogue input is configured as

discharge temperature of compressor 1.

• For compressor 2: one output relay is configured as solenoid valve compressor 2 and one analogue input is configured as

discharge temperature of compressor 2.

31.1 FUNCTIONNING

When the compressor is off the solenoid valve output is always OFF. When the compressor is on: if the PTC temperature of the

compressor discharge reaches CO51 setpoint the valve turns ON, while if the temperature decreases under C51-CO52 (set- differential)

the valve turns off.

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Emerson X-web300 Manual de usuario Pagina 71

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