CLIVET AQX CLA Series - Troubleshooting Guide; General and Start-up Issues; In Operation Issues

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9 - TROUBLESHOOTING
GENERAL
The aim of the following sections is to provide possible solutions to
a number of anomalies that may arise on the unit.
The information provided does not cover the entire range of
possible cases.
The activation of a safety device indicates abnormal operation;
before resetting it, check and eliminate the causes.
The following is a list of possible problems and the corresponding
causes and solutions.
CAUTION
These operations must be carried out by specialist technical
personnel possessing the legal requirements and in compliance
with the safety standards in force.
Before performing any checks on moving or live parts, switch the
unit off at the mains isolator switch.
ON START-UP
POOR AIR FLOW-RATE:
 Damper not calibrated
 Incorrect direction of rotation of the fan
 Loose belts
 Power supply voltage lower than envisaged
 Resistance of the circuit higher than envisaged or accidental
obstructions
INSUFFICIENT HUMIDIFICATION
 Incorrect direction of rotation of the pump. Reverse two phases
powering the motor
 Dirty nozzles
 Insufficient water level in the tank, due to defective control by
the float
WATER DRAGGED THROUGH THE ELIMINATOR
 Excessive air flow-rate
 Excessive water flow-rate to the humidifier
 Defective seal on the eliminator
EXCESSIVE NOISE
 Fan assembly locking devices still in place
 Defective bearings
 Magnetic howling of the motor due to a voltage drop or
manufacturing defect
 Foreign material in the fan shroud
 Vibration of the damper fins
 Howling due to vibration of the ducts, baffles, outlets, diffusers
 Fan "pumping" (excessive back-pressure in respect to the flow-
rate)
 Excessive air flow-rate
POOR COIL HEATING CAPACITY
 Insufficient temperature or flow-rate of the thermal carrier fluid
 Incorrect water connections
 Air in the coil. Vent.
 Automatic control malfunctioning
 Unsuitable condensate discharge (steam coils).
EXCESSIVE AIR FLOW-RATE
 Resistance of the circuit lower than envisaged
 Dampers not calibrated
 Filters not installed
 Doors open or panels missing
ELECTRIC MOTOR
 Power input higher than the rated value. Check the problems
related to excessive air flow-rate.
 Incorrect direction of rotation. Reverse two phases powering
the motor
EXCESSIVE AIR FLOW-RATE
 Decrease in circuit resistance due to non-calibrated dampers
 Decrease in circuit resistance due to missing or damaged filters
 Decrease in circuit resistance due to open doors
 Decrease in circuit resistance due to non-calibrated outlets
ELECTRIC MOTOR
 Power input higher than the rated value. Check the problems
related to excessive air flow-rate.
 Incorrect direction of rotation. Reverse two phases powering
the motor
IN OPERATION
DECREASE IN AIR FLOW-RATE
 Increase in circuit resistance due to dirty filters or the formation
of frost
 Increase in circuit resistance due to fin coils blocked by
deposits
 Increase in circuit resistance due to non-calibrated dampers
 Increase in circuit resistance due to deposits in the wet deck
 Increase in circuit resistance due to dirty heat recovery unit
 Faulty transmission
 Accidental obstructions or blocked components in the air
distribution network