11
UVR-HE Series
10. OPERATING ANOMALIES
SYMPTOMS
CAUSES
SOLUTIONS
Difficult
start-up
Reduced power supply voltage.
Insufficient motor starting torque.
Check the motor plate data.
Close the shutters until full speed is reached. If necessary, replace
the motor.
Insufficient
air flow rate
Insufficient pressure
Clogged pipes and/or obstructed intake points.
Clogged impeller.
Overloaded filter.
Insufficient rotation speed.
Obstructed exchange pack.
Intake and pipe cleaning.
Impeller cleaning.
Clean or replace the filter.
Check the power supply voltage; if necessary, correct.
Exchange pack cleaning.
Performance drop after
An acceptable period of
operation
Leak in the circuit upstream and/or
downstream of the fan.
Damaged impeller.
Circuit check and reset of the original conditions.
Check the impeller and, if necessary, replace with original spare
part.
Fresh air temperature
too cold
Outdoor air below -5°C
Insertion of post-heating devices.
Insufficient exchanger
output.
Clogged exchanger fins
Exchange pack cleaning.
Formation of frost on the
exchanger.
Outdoor air below -5°C
Insertion of pre-heating devices (de-icing).
Air pulsations
Fan that works near
zero flow rate conditions.
Unstable flow, obstruction or
poor connection.
Change of the circuit and/or fan replacement.
Cleaning and/or reset of the intake ducts.
Intervene in the electronic regulator by increasing the minimum
speed (insufficient voltage).
Excessive vibrations
Imbalances of rotating parts
Check the impeller balancing; if necessary, restore or replace it.
