21
8. OPERATION ANOMALIES
8.1. GENERAL ANOMALIES
Anomaly
Cause
Solution
Diffi cult to start.
Reduced power supply voltage.
Insuffi cient static torque of motor.
Check motor specifi cation plate.
Close the air inlets to reach the maximum speed.
Change the motor is necessary.
Contact the
S&P
Post-Sales service.
Insuffi cient airfl ow.
Insuffi cient pressure.
Blocked pipes and/or inlet points
closed.
Fan obstructed.
Filter overloaded.
Insuffi cient rotation speed.
Exchanger package blocked.
Clean inlet tubes.
Clean fan.
Clean or replace fi lter.
Check power supply voltage.
Clean the exchanger.
Reduction in
performance after a
period of acceptable
operation.
Leaks in the circuit before and/or
after the fan.
Damaged roller.
Check the circuit and restore original conditions.
Check the impeller and if necessary, replace with
an original spare part.
Contact the
S&P
post sales service.
New air temperature too
cold.
Outside air -5ºC or less.
Insertion of post-heating resistances.
Contact the
S&P
post sales service.
Insuffi cient performance
of the exchanger.
Fins dirty.
Clean the exchanger.
Formation of frost on the
exchanger.
Outside air below -5ºC.
Insertion of pre-heating devices (anti-ice).
Contact the
S&P
Customer Advice service.
Air pulsation.
Fan working in excessively low fl ow
conditions.
Flow instability, obstruction or
bad connection.
Modifi cation of the circuit and/or replacement of
the fan. Clean and/or readjust the inlet channels.
Operate the electronic regulator, increasing the
minimum speed (insuffi cient voltage).
Contact the
S&P
Customer Advice service.
There is water inside the
unit.
Drain clogged or wrongly
dimentioned.
Check if exists a body/object obstructing the
passage of water and remove it. Verify that the
drain trap exists and is correctly sized according
to the instructins of this manual.
