Klimor EVO-S - 8. List of most common faults

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EVO-S, EVO-H MODULAR AIR HANDLING UNITS
OPERATION AND MAINTENANCE MANUAL
8. List of most common faults
Table 30 List of most common faults in the units
Item Unit
Signs of malfunctioning of
the unit
Cause Removal
1.
Filtering and mixing
section
insucient airow
excessive pollution of the pre-lter or ne lter cleaning or replacement
housing leakage tighten clamps on the covers
2. Fan section
insucient airow damage to the exible fan stub apply a patch by sticking or replace with a new one
airow stop
motor damage removal of damage or replacement with a new one
no power supply to the motor damage repair on the dashboard or on the power cord
closing of the air damper repair of the damage
increased noise
damage to the fan or motor bearing replacement
mechanical damage to the rotor damage repair or replacement
loosening of screw connections tightening nuts and bolts
increased vibrations
damage to dampers replacement
loose rotor at the shaft x the failure or replace with a new one
3. DX cooling section
air temperature at the unit's outlet
too high
wrongly adjusted thermostatic valve (too little cooling
medium is supplied to the cooler)
perform appropriate adjustment
dirty lter on the DX cooler power supply clean the lter insert or replace it with a new one
defective thermostatic valve or control valve replace the valve with a new one
air cooler oiling remove oil from the cooler by reducing overheating
airlocked cooler intake water temperature too low vent the cooler, check the cause of low water temperature
frosting the cooler medium evaporation temperature too low increase the temperature of medium evaporation
Freon leakage leaks on screwed or welded joints locate the leakage point and seal it
4. Cooling section
outlet air temperature too high
not enough water is fed to the cooler
change the setting of the thermostat valve regulator to the
correct one
water supply pressure too low for the cooler
check the position of the fully open shut-o valves on
the supply line
airlocked cooler
check the position of the fully open shut-o valves on the
outlet line vent the cooler,
air temperature at the unit's outlet
too low
Too much water is fed to the cooler change valve regulator thermostat to the correct setting
5. Heating section
Too low air temperature at
the outlet
Not enough water delivered to the heater adjust the thermostatic valve setting
Too low pressure of water delivered to the heater
check position of the fully open cut-o valves at the
supply pipe
Too high air temperature at the
AHU outlet
Air in the heater (water heater)
check position of the fully open cut-o valves at the outlet
pipe and bleed the heater
Too much water delivered to the heater ajust the thermostatic valve setting
6.
Humidication
section
air humidity at the unit's outlet
too low
too little steam or water supply through the humidier check the patency of the nozzles and clean them
water supply pressure too low
check the operation of the electromagnetic valve or check
the operation of the control valve; reduce pressure on
the reduction valve check the reason for water supply
pressure being too low
check the operation of electric steam generator
outlet air temperature too high too much steam or water supply through the humidier
reduce water supply pressure
check the operation of electric steam generator
7.
Damping and
separation section
no possibility to control the
temperature and humidity of the
air leaving the air handling unit
thermometer damage replace with a new one
malfunction of the hygrostat
perform the adjustment according to the instructions or
replace with a new one
NOTE:
ALL WORKS RELATED TO REPAIR AND ADJUSTMENT OF THE AIR HANDLING UNIT POWER SUPPLY SYSTEMS SHOULD
BE PERFORMED IN ACCORDANCE WITH THE OPERATING MANUAL OF THE ENTIRE AIR CONDITIONING SYSTEM.