8
VARD / VARW.. – High-Pressure In-Line Duct Fans
Installation and Operating Instructions
UK
4.1 Cleaning
WARNING
An insulation fault may result in electric shock!
Before cleaning, isolate the fan from the mains power supply and protect against being switching on again!
– The disassembly of the unit or parts of the unit may be necessary for the cleaning.
This must be carried out by suitable specialist personnel cf. section 1.6!
– Clean fan flow area, impeller, struts and motor.
– Do not use aggressive cleaning agents that could damage the paintwork!
– High pressure cleaners or water jets are not permitted!
4.2 Information – Fault causes
The safety instructions specified in chapter 1, section 1.2 must be observed!
The elimination of faults must only be carried out by specialist personnel, cf. chapter 1.6!
4.3 Spare parts
Only original Helios spare parts are to be used. All repairs may only be carried out by authorised specialist
personnel/companies.
Abnormal noises
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Grinding impeller
Clean, replace if necessary
Bearing damage
Replace bearing
Mechanical damage
Carry out maintenance
Incorrect direction of rotation
Check, modify connection
Power consumption too
high
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Grinding impeller
Clean, replace if necessary
Bearing damage
Replace bearing
Fan does not perform
(speed)
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Incorrect voltage
Check/modify connection
Defective capacitor
Check/replace capacitor
Bearing damage
Replace bearing
Contamination
Clean
Insufficient backflow
Widen backflow openings
Incorrect direction of rotation
Check/modify connection
WARNING
nm
ATTENTION
l m p r n
Error/Fault
Causes
Solution
Fan does not start
No voltage, phase missing
Check mains voltage
Defective capacitor
Check/replace capacitor
Impeller blocked
Clear blockage, clean, replace impeller if
necessary
Motor blocked
Check motor, replace if necessary
Fuse tripped
Short-circuited coil/ground fault in motor
Replace motor
Supply line/connection damaged
Replace parts, replace motor if necessary
Connected incorrectly
Check connection, change
Residual current device
tripped
Motor insulation damaged
Replace motor
Supply line insulation damaged
Replace supply lines
Motor protection switch
triggered
Tight bearing
Replace bearing
Impeller touching
Clean, replace impeller if necessary
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Vibrations
Contamination
Clean
Bearing damage
Replace bearing
Incorrect operating point
Check suitability of fan, Check/keep inflow
and outflow clear
Attachment-related resonance
Check or repair attachment, use vibration
damper
Incorrect direction of rotation
Check/modify connection
