High Temperature and Low Temperature (Simultaneously). Liebert 3000, Liebert Challenger 3000, CHALLENGER 3000
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Alarm Descriptions
5.1.8 High Temperature and Low Temperature (Simultaneously)
If these two alarms are displayed at the same time, the temperature input signal is lost (or the humidity is out of sensor range: 15 to 85% RH). Dashes will be displayed for the temperature reading.
The control system will initiate 100% cooling. Check for a disconnected cable or a failed sensor.
5.1.9 Humidifier Problem
Infrared Humidifiers
This alarm is activated by the high water float switch in the humidifier pan assembly. The high water float switch is normally closed and opens upon alarm condition. Check for drain clog and, if present, clean drain. Check for float switch stuck high; replace the switch as necessary. Check for proper operation of the humidifier water makeup valve.
Steam Generating (Canister) Humidifiers
This alarm is activated by a signal from the humidifier control indicating that the canister needs to be replaced.
5.1.10 Loss of Air Flow
A differential air pressure switch is used to indicate loss of air flow in Challenger 3000 units.
Check for blockage of unit air outlet or inlet. Check blower motor fuses and overload reset. Check for broken belts. Make sure blower wheels are tight to shaft. Run diagnostics to see if the fan contactor is working properly.
5.1.11 Loss of Power
If the unit has lost power, or the disconnect switch was turned off before the unit ON switch was pressed (to turn the unit Off), this local alarm will occur when power is restored to the unit. A Liebert remote monitoring unit (optional) will immediately indicate loss of power.
5.1.12 Low Humidity
If the return air humidity has decreased to the Low Humidity Alarm setpoint, check to make sure that the unit is setup for humidification (check DIP switch). Check for proper setpoints. Does the room have a vapor barrier to seal it from outdoor humidity? Are doors or windows open to outside air?
Run diagnostics to make sure the humidifier system is working properly.
5.1.13 Low Suction Pressure
A pressure switch monitors the suction pressure at the compressor inlet to monitor whether pressure has dropped below a factory preset point while the compressor is in cooling operation. When pressure drops below a factory preset point, the switch opens. After the positive start kit time delay, and the switch stays open for five minutes, the alarm is activated. The alarm stays active for 90 minutes.
Look for conditions that would cause loss of refrigerant. Check for piping problems such as leaks or crimped lines. Check for inoperative components such as liquid line solenoid valve, low pressure switch, expansion valve, and head pressure control valve. Check for closed service valves in the liquid line or at the condenser or receiver.
5.1.14 Low Temperature
If the return air temperature has decreased to the Low Temperature Alarm setpoint, check for proper setpoints. Run diagnostics to make sure all heating components are operating (contactors and reheats). Are reheats drawing the proper current? (See nameplate for amp rating.)
5.1.15 Main Fan Overload
An optional tri-block overload is required for this alarm, and may or may not replace internal motor overload, depending on your model. The overload device is located next to the main fan contactor in the line voltage section. The alarm is activated when the overload is tripped.
40
DISCONTINUED
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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