Emerson 20/20 service manual Condenser Control, Oil Pump, Oil Cooling, Motor Current Device

Models: 20/20

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Section 19 • Configuration

Condenser Control

The values in this section enables the condenser con- trol feature of the Vission 20/20. Once selected the checkboxes will become available for selection and the condenser control screen will be available via the menu screen. Some of the options check boxes in this section may not be available for selection unless the proper I/O cards are installed and enabled, see Figure 19-2. Configuration Screen - Page 2.

Ambient Sensor:

Enables the ambient temperature option for the con- denser control algorithm.

Wetbulb Sensor:

Enables the wetbulb temperature override option for the condenser control algorithm.

VFD Fan:

Enables the VFD output option for the condenser control algorithm.

Oil Pump

This section defines how the Vission 20/20 will control the oil pump, see Figure 19-2. Configuration Screen - Page 2.

No Pump:

Disables all functions for oil pump control. Cycling:

Enables option for cycling oil pump. Oil pump is cy- cled on and off depending on compressor differential pressure.

Full Time:

Enables option for full time oil pump. Oil pump will always be running while the compressor is running.

# Pumps:

• Not currently used

Oil Cooling

The section defines how the Vission 20/20 will monitor and/or control the temperature of the compressor oil, see Figure 19-2. Configuration Screen - Page 2.

Thermosyphon:

This defines the compressor oil cooling method as thermosyphon.

H20 Oil Cooler:

This defines the compressor oil cooling method as water heat exchange.

Liquid Injection:

This defines the compressor oil cooling method as liquid refrigerant injection.

Solenoids:

Enables the solenoid for liquid injection control. Motorized Valve:

Enables the motorized value for liquid injection con- trolled by PID settings.

Motor Current Device

The Vission 20/20 can read the motor current in a couple of different ways. The following selections defines the method, see Figure 19-2. Configuration Screen - Page 2.

Current Transformer:

This defines the input used for motor current when a current transformer is used.

4-20ma Transformer:

• This defines the input used for motor current.

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 service manual Condenser Control, Oil Pump, Oil Cooling, Motor Current Device

20/20 specifications

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