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Operation with Advanced Microprocessor with Graphics Control
3.7.2 Select Options
The following table is a list of options which should match the options installed with your unit and should not need to change during normal operation.
Table 10 Unit options
Option
Reheat 1
Humidity
Dehumidify
Hot Gas Reheat 2
Stages of Reheat 3
Selection
YES or NO
YES or NO
YES or NO
YES or NO
2
1
Heating cannot be disabled on units with SCR reheats.
2
Hot gas reheat not available on units with SCR reheats.
3
Heat stages not selectable on units with SCR reheats.
3.7.3 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°F 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.
3.7.4 Calibrate Valve Actuator
For systems that use a valve actuator for chilled water or GLYCOOL cooling, the actuator timing may be calibrated or adjusted. 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 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 to memory.
3.7.5 Select Control Algorithm (Chilled Water and SCR Reheats only)
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 4.0 - System
Performance with Advanced Microprocessor Controls for more details on types of control.
22
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Table of contents
- 9 System Descriptions
- 9 Compressorized Systems
- 9 GLYCOOLâ„¢ (Chilled Glycol Cooling) Systems
- 9 Chilled Water Systems
- 10 Start-Up Procedure
- 11 Basics
- 13 Status Display
- 13 Main Menu
- 13 Status/Alarm Data
- 13 Active Alarms
- 13 Operating Status
- 13 Alarm History Log
- 14 Run Hours Log
- 14 Analog Sensors
- 14 Setpoints/Setup
- 14 View Setpoints
- 15 Setup System
- 20 Run Diagnostics
- 21 Change Passwords
- 21 Date and Time
- 21 Status Display
- 21 Control Circuit Board
- 21 LCD Display Contrast
- 22 Non-Volatile Memory
- 22 DIP Switches
- 22 Control Outputs
- 23 Basics
- 25 Status Display
- 25 Main Menu
- 25 View/Set Alarms
- 25 Active Alarms
- 25 Alarm History Log
- 26 Setup Alarms
- 27 Setup Custom Alarms
- 27 View Water Detect Floor Plan (for Optional LTM1000/LT750)
- 27 Setup Water Detect Floor Plan
- 28 Operating Status
- 28 View/Set Control Setpoints
- 28 System Setup
- 28 Setup Operation
- 30 Select Options
- 30 Calibrate Sensors
- 30 Calibrate Valve Actuator
- 30 Select Control Algorithm (Chilled Water and SCR Reheats only)
- 31 Select Humidity Sensing Mode
- 31 Set Status Display
- 31 Change Passwords
- 31 Run Diagnostics
- 32 Show Inputs
- 32 Test Outputs
- 32 Test Control Board
- 33 DIP Switches
- 33 Date and Time
- 33 Plot Graphs
- 33 3.10.1 Modify Plot Scales
- 34 Analog/Digital Inputs
- 34 3.11.1 Read Analog Inputs
- 34 3.11.2 Setup Analog Inputs
- 34 3.11.3 Read Digital Inputs
- 34 3.11.4 Setup Digital Inputs
- 34 View Run Hours Log
- 35 3.12.1 View 24 Hour Run Time History
- 35 3.12.2 View Total Run Hours
- 35 Control Circuit board
- 35 3.13.1 LCD Contrast
- 36 3.13.2 Nonvolatile Memory
- 36 3.13.3 DIP Switches
- 36 3.13.4 Control Outputs
- 37 Temperature Control
- 37 Cooling/Heating Required, in Percent (%)
- 37 Response to Control Types
- 38 Cooling Operation
- 39 Heating Operation
- 39 Humidity Control
- 39 Dehumidification/Humidification Required, in Percent
- 39 Response to Control Types
- 39 Dehumidification Operation
- 40 Humidification Operation
- 40 Control Types
- 40 Proportional Control
- 40 PID Control (Chilled Water or SCR Reheats only)
- 41 Intelligent Control (Chilled Water only)
- 42 Load Control Features
- 42 Short Cycle Control
- 42 Sequential Load Activation Control
- 42 Additional Features
- 42 Connecting the Analog Sensors
- 43 Water Detection Display
- 45 Communications
- 46 Standard Alarms
- 46 Change Filter
- 47 Compressor Overload
- 47 Custom Alarms
- 47 High Head Pressure
- 47 High Humidity
- 47 High Humidity and Low Humidity (Simultaneously)
- 47 High Temperature
- 48 High Temperature and Low Temperature (Simultaneously)
- 48 Humidifier Problem
- 48 5.1.10 Loss of Air Flow
- 48 5.1.11 Loss of Power
- 48 5.1.12 Low Humidity
- 48 5.1.13 Low Suction Pressure
- 48 5.1.14 Low Temperature
- 48 5.1.15 Main Fan Overload
- 49 5.1.16 Short Cycle
- 49 Optional/Custom Alarms
- 49 Loss of Water Flow
- 49 Smoke Detected
- 49 Standby GC Pump On
- 49 Standby Unit On
- 49 Water Under Floor
- 50 System Testing
- 50 Environmental Control Functions
- 52 Filters
- 53 Blower Package
- 53 Fan Impellers and Bearings
- 53 Air Distribution
- 54 Refrigeration System
- 54 Suction Pressure
- 54 Discharge Pressure
- 54 Superheat
- 55 Thermostatic Expansion Valve
- 55 Hot Gas Bypass Valve
- 56 Air Cooled Condenser
- 57 Water/Glycol Cooled Condensers
- 59 Compressor Functional Check
- 59 Compressor Replacement