Page 82 - IOM / ROOF-TOP FLEXY™ Series
Before Calling for Assistence
- The network voltage should not vary from + or - 10 % of
the supply required for the equipment,
- The supply variation between the phases should never
exceed + or - 3 %.
1. Check that there is current in the electrical panel,
2. Check that the filters are not clogged,
3. Make sure the fans are in good working order (belts
tensioned, etc...),
4. Test the operation of the compressor(s),
5. If the equipment is fitted with an electrical reset safety
mechanism, reset it and test to see if the fault re-
occurs. If so, have the following checks performed by
trained personnel.
MAIN OPERATING FAULTS
No Air Flow (blower side)
Problem :
- Low performance.
- Danger of one or more compressors cutting out (low
pressure switch cutout).
- Danger of evaporator freezing.
- Possible cutout of the electrical heaters safety thermos-
tat.
Cause :
- The blow sleeve assemblies drop their load excessively
(sleeves too small, closed valves, obstacle).
- Blocked filters or coils.
- Wrongly tensioned or brocken belts.
Solution :
- Check the sleeve assemblies.
- Check the filters, coils and service them, if necessary.
- Check the belts, re-tension or replace them, if
necessary.
No Air Flow (condenser side)
Problem :
- Compressor cutout (high pressure switches).
Cause :
- Dirty coils.
- One or more fans do not work properly.
Solution :
- Clean the coil.
- Change one of more faulty fans.
Fan stops following thermal relay cutout
(indicated via an error code)
Problem :
- The fan and the compressors are not working.
Cause :
- Drive absorbed power too high:
• Air flow too high.
• Belts over tensioned.
• Bearing seized.
• Phase Lost
• Supply voltage too low or unbalanced phases (+/-
3%).
Solution :
- Reset the thermal relay.
If the error recurs:
• Check the thermal relay setting (it must correspond to
the rated current shown on the drive plate).
• Check the flow, belts and bearings.
• Check the supply voltage.
Stopping compressor (indicated via an error code)
Problem :
- Thermal or freezing process drops or stops,
Causes :
- The compressor absorbs very high current (very hot air
on the evaporator and condenser inlet, missing flow,
voltage too low or unbalanced phases (+/- 3%).
- The compressor is manually out of action.
- The coil thermal safety is open.
- The compressor is powered by two phases instead of
three.
Solution :
- Try to restart when the compressor is cold. If the fault
recurs:
• Check the air flows (see lack of air flow).
• Check that the fans are working properly and the
outer heat exchangers are clean.
• Check the supply voltage.
• If the compressor is manually out of action, replace it.
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