Tube Fan
INS00062-B
Original instructions
ENGLISH | 9
CAUTION
The fan motor can get hot during operation
Do not touch it to prevent burns
8
Maintenance
DANGER
Switch off and completely isolate the fan from the electrical
supply before commencing maintenance.
WARNING
All moving parts must be at a complete standstill before com-
mencing maintenance.
WARNING
Even when electrically isolated, fans may be subjected to free
spinning or „wind milling“. Secure the impeller physically to re-
strict rotational movemenent where this poses a risk.
8.1
Maintenance schedule
►
Maintenance tasks – TO BE CARRIED OUT EVERY MONTH
1. Examine the fan housing for defects and remove any dirt that has accu-
mulated.
2. Examine the motor and remove any dirt that has accumulated on the
motor and between the motor cooling fins.
3. Examine the impeller for defects and remove any dirt that has accumu-
lated.
4. Examine the condition of the guards (if fitted) and remove any dirt that
has accumulated.
►
Maintenance tasks – TO BE CARRIED OUT EVERY 3 MONTHS
1. Check the condition of the bearings.
2. Check the tightness of fasteners and fixings.
►
Maintenance tasks – TO BE CARRIED OUT ANNUALLY
1. Only for 1~ fan motors: check the capacitor capacitance.
8.2
Maintenance subjects
Cleaning
In areas of application where high levels of contamination are present,
cleaning intervals should be adjusted accordingly.
Cleaning is preferably done using a soft brush. Do not use any aggressive
detergents, solvents or chemicals for cleaning.
Wet cleaning
Wet cleaning is allowed using low pressure clean water spray. Avoid directing
water jets at bearings and electrical connections as much as possible.
When wet cleaning is planned, close any open condensate drain holes before
commencing wet cleaning.
WARNING
Do not use a high pressure cleaner.
Water may penetrate electrical connections and bearings.
►
After wet cleaning
1. Open the condensate drain hole at the lowest point of the fan motor.
2. Run the fan for 2 hours at full speed to remove any moisture that may
have entered the fan motor.
Bearings
The bearings used in the fan and/or fan motor are maintenance free and
greased for life. Average lifespan during normal operation is >30.000 hours.
Defects in the bearings can usually be detected by listening. When the shaft /
impeller is rotated by hand, it should move freely with a smooth uniform
sound. Squeaking or grinding noises indicate the bearings may require
replacement.
Impeller
Cleaning the impeller is very important. A dirty impeller will suffer from
imbalance resulting in vibrations. A dirty impeller will also result in reduced fan
performance and reduced fan efficiency.
Capacitor (1~ fan motor)
Capacitor capacitance decreases slowly over time. Average lifespan is ±
30.000 hours. Replace the capacitor when the capacitance has dropped
below the value as listed on the capacitor.
Start capacitor (1~ fan motor)
The start capacitors’ lifespan is 500.000 starts. Replace the start capacitor
when the number of starts has reached 500.000.
The start capacitor cannot be serviced or repaired. The start capacitor must
be replaced if it is not functioning properly anymore.
9
Troubleshooting and repairs
WARNING
Troubleshooting and repairs must be performed by
Fault
Possible cause
Possible remedy
Airflow too high
Fan speed (rpm) too high
Check supply voltage and frequency
System resistance lower than specified
Reduce fan speed (if fan can be speed controlled)
Choose alternative fan
Airflow too low
System resistance higher than specified
Choose alternative fan
Lower system resistance
Excessive vibration
Impeller imbalance -> impeller damaged
Replace the impeller
Impeller imbalance -> impeller dirty
Clean the impeller
Bearings are damaged or worn
Replace the bearings
Fan does not start
No power supplied to fan
Check all power supplies
Check fuse/circuit breaker
