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Operation with Advanced Microprocessor Controls
2.5.3 Run Diagnostics
By selecting Run Diagnostics, maintenance personnel can check system inputs, outputs, and complete a test of the microcontroller circuit board, all from the front panel. Review of the system inputs and the microcontroller test can be done without interrupting normal operation. To test the system outputs, the normal system control is temporarily suspended. DO NOT leave the unit in the diagnostics mode any longer than is necessary for troubleshooting. The control system will return to normal operation in 5 minutes, automatically, if no key is pressed.
Show Inputs
With the unit on and the fan running, the input state for the following devices may be displayed:
• Air sail switch: normally off unless Loss of Air Alarm is active
• Custom alarm #1: normally off unless this alarm is active
• Custom alarm #2: normally off unless this alarm is active
• Custom alarm #3: normally off unless this alarm is active
• Custom alarm #4: normally off unless this alarm is active
• Humidifier problem: normally on unless this alarm is active
• Filter clog: normally off unless Change Filters Alarm is active
• Main fan overload: normally on unless Main Fan Overload Alarm is active
• Shutdown device: normally on unless unit is off through the Fire Stat or Remote Shutdown
Device
• Low press switch: normally on if compressor circuit is in operation
• Comp overload: normally on unless Compressor Overload Alarm is active
• High head comp: normally off unless High Head Pressure alarm Compressor is active
Test Outputs
When this feature is selected, the unit is effectively turned off. When stepping from one load to the next, the previous load, if on, is turned off automatically. The loads can also be toggled ON/OFF by selecting “ENTER.” Once turned on, the output will remain on for 5 minutes unless toggled off or the
Test Outputs function is exited by selecting “MENU/ESC.” (The compressor is limited to 15 seconds on to prevent damage.) The outputs are as follows:
• Main fan: main fan contactor
• Comp: compressor contactor
• LLSV: liquid line solenoid valve
• HGBP/CUV: hot gas bypass or compressor unloader valve (on certain units)
• Part coil: part coil solenoid valve
• CWV/CGV: chilled water or GLYCOOL valve
• R5 Relay: Relay 5 (heat rejection)
• Reheat 1: Reheat 1 contactor (also energizes fan for safety) or SCR Reheats
• Reheat 2: Reheat 2 contactor (also energizes fan for safety)
• HWR: hot water solenoid valve
• Humidifier: humidifier contactor (also energizes humidifier makeup valve and fan for safety)
• HMV: humidifier makeup valve
• Comm alarm: common alarm relay
!
CAUTION
Do not test a compressor output for more than a few seconds. Compressor damage could result!
Test Control Board
By selecting this function, the microcontroller will perform a self test lasting approximately 10 seconds. At the end of the test, the ROM checksum, ROM part number and version number will be displayed.
12
DISCONTINUED
PRODUCT
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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