Select Options. Vertiv Liebert Deluxe System 3, Refrigerator DH, DE, DH, VH, VE

Advanced Microprocessor with Graphics Control Setup

4.7.2 Select Options

The following table is a list of features that should match the options installed with your unit and should not need to change during normal operation.

Table 10 Select options

Heating

Option

Humidifier

Dehumidifier

Humidifier Pan

Hot Gas Reheat

Heat Stages*

Dehumidification Stages

Selection

Yes or No

Yes or No

Yes or No

Small or Large

Yes or No

2 or 3

1 or 2

*If heat stage is set to 2 on a chilled water unit, the reheat 3 output is energized on a call for dehumidification.

4.7.3 Calibrate Sensors

The temperature and humidity sensors can be calibrated by selecting this menu item. “SENSOR” shows the actual sensor reading or raw reading. “CALIBRATED” shows the sensor reading after the calibration offset has been added. The temperature sensor can be calibrated ±5 degrees Fahrenheit and the humidity sensor can be calibrated ±10% RH. When calibrating the humidity sensor, the value shown will always be % RH, even though absolute humidity control may be selected. If absolute humidity control is selected, the Normal Status Display will display the adjusted reading and may not agree with the relative humidity reading displayed while in calibration.

4.7.4 Calibrate Valve Actuator

For systems that use a valve actuator for chilled water or glycol cooling, the actuator timing may be calibrated or adjusted through this feature. This is the time it takes for the valve to travel from full closed to full open. It is programmable from 0 to 255 seconds. The factory default time is 165 seconds and should not be changed unless the actual valve travel time is not correct. The full valve travel time is used by the control to determine the appropriate valve position. For example, if the valve travel time is 165 seconds and 50% cooling is being called for, the valve will open for 83 seconds to achieve

50% open. To change the valve travel time, first enter the “CALIBRATE VALVE ACTUATOR” screen.

The display will show the present period used by the control for valve actuator full travel. Press

ENTER and adjust the time using the UP/DOWN arrows. When the correct time is displayed, press

ENTER to store the new time in memory.

4.7.5 Select Control Algorithm

The type of system control method used by the microprocessor can be selected from the front panel.

The default setting is INTELLIGENT, which approximates the actions that a human operator would take to maintain precise, stable control. The control logic uses Artificial Intelligence techniques including “fuzzy logic” and “expert systems” methods to maintain precise, stable control and increase reliability by reducing component cycles. PROPORTIONAL is a standard control method that uses one gain factor (temperature sensitivity adjustment). TUNABLE PID (Proportional, Integral, and

Derivative) uses three gain factors selected by the operator. PID allows precision tuning, but requires an experienced operator and seasonal adjustments. Note that if PID is selected, it is used for temperature control while humidity will continue to use Proportional Control. For chilled water units with the optional Variable Speed Drive, Intelligent is required for proper operation. Refer to 5.0 -

Response by Control Type—Advanced Microprocessor Controls

for more details on types of control.

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