Emerson Liebert Challenger With Liebert iCOM Control 3000/ Manual do Utilizador Página 45
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Component Operation and Maintenance
39
7.2 Filters
Filters are usually the most neglected item in an environmental control system. To maintain efficient
operation, they should be checked monthly and changed as required. Because replacement intervals
vary with environmental condition and filter type, each unit is equipped with a filter clog switch. This
warns of restricted airflow through the filter compartment by activating the Change Filter alarm.
Turn power Off before replacing filters.
Liebert Challenger 3000 Liebert and Challenger ITR filters are 28-1/2" by 29-1/2", either 2" or 4"
thick, plus an optional 2" thick pre-filter. The filter is replaced from the front of the unit. On upflow
units, the filter is vertical, in front of the lower compartment. Pull the filter out toward you to remove
it. On downflow units, the filter is horizontal, above the electrical panel. Slide the filter out toward
you to remove it.
After replacing the filter(s), test the operation of the filter clog switch. Turn the adjusting screw coun-
ter clockwise to trip the switch — this will energize the Change Filter alarm. To adjust the switch pro-
ceed as follows: With the fan running, set the switch to energize the light with clean filters. The unit
panels must all be in place and closed to accurately find this point. Then turn the adjusting knob one
turn clockwise, or to the desired filter change point.
7.3 Blower Package
Periodic checks of the blower package include: belt, motor mounts, fan bearings, and impellers.
7.3.1 Fan Impellers and Bearings
Fan impellers should be periodically inspected and any debris removed. Check to see if they are
tightly mounted on the fan shaft. Rotate the impellers and make sure they do not rub against the fan
housing.
Bearings used on the units are permanently sealed and self-lubricating. They should be inspected for
signs of wear when the belt is adjusted. Shake the pulley and look for movement in the fan shaft. If
any excessive movement is noticed, bearings should be replaced. However, the cause of the wear must
be determined and corrected before returning the unit to operation.
7.3.2 Belt
The drive belt should be checked monthly for signs of wear and proper tension. Pressing in on belts
midway between the sheave and pulley should produce from 1/2" to 1" (12 to 25 mm) of movement.
Belts that are too tight can cause excessive bearing wear.
Belt tension can be adjusted by raising or lowering the fan motor base. Loosen nut above motor
mounting plate to remove belt. Turn nut below motor mounting plate to adjust belt tension. If belt
appears cracked or worn, it should be replaced with a matched belt (identically sized). With proper
care, a belt should last several years.
NOTICE
Risk of improper adjustment. Can cause equipment damage.
After adjusting or changing the belt, check to ensure that the motor base nuts are tightened.
The bottom adjustment nut should be finger tight. The top locking nut should be tightened
with a wrench.
- Precision Cooling 1
- 2
- TABLE OF CONTENTS 3
- SAVE THESE INSTRUCTIONS 7
- 1.0 INTRODUCTION 9
- 2.0 STARTUP 10
- 3.1 Features 12
- Viewing Data 17
- 4.1.3 Entering the Password 17
- 4.1.4 Accessing Submenus 18
- RETURN AIR TEMPERATURE 22
- RETURN AIR HUMIDITY 22
- Small Displays 23
- Large Displays 24
- Wall-Mount Large Display 24
- Liebert iCOM 28
- I/O Board 28
- Optional Large 29
- Graphics Display 29
- (Rear View) 29
- 5.0 OPERATION 33
- Autorestart 34
- Loss of Power Alarm 34
- Low-Pressure Time Delay 34
- High Pressure Alarm 35
- 5.1.3 Compressor Timing 35
- 5.2 Control Types 36
- Operation 37
- 6.0 ALARM DESCRIPTIONS 38
- Alarm Descriptions 39
- 6.2 Optional Alarms 41
- 6.3 Set Alarms—User Menus 41
- 7.1 System Testing 42
- Control Transformer and Fuses 43
- Fan Safety Switch 43
- High-Temp Sensor 43
- Smoke Detector 43
- Water Detection Sensor 43
- Liebert Unit 44
- Recommended Liebert 44
- Liqui-tect location 44
- Floor drain 44
- 7.2 Filters 45
- 7.3 Blower Package 45
- 7.4 Refrigeration System 46
- 7.4.2 Discharge Pressure 47
- 7.4.3 Superheat 47
- Adjustment 47
- 7.4.6 Air Cooled Condenser 48
- Coaxial Condenser 49
- Service menu 50
- 7.4.10 Drycooler Settings 52
- 7.5 Compressor Replacement 53
- Mechanical Failure 54
- Electrical Failure 54
- Glycol Solution Maintenance 55
- 7.7 Humidifier 56
- Changing Humidifier Lamps 57
- Autoflush Operation 57
- Autoflush Controls 58
- Controls 59
- Replacing the Canister 60
- Circuit Board Adjustments 61
- Drain Tempering Feature 61
- 8.0 TROUBLESHOOTING 62
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