9. Fault Finding, Correction and Spares
Page
18
of
28
9. Fault Finding, Correction and Spares
MFH Fan Assisted Heater
See Maintenance instructions for procedures relating to these faults.
Fault
Check
Resolution
Vibration
De-energise the heaters
- Ensure that all feet are
properly seated on the
ground and that the heater
is positioned on a clear
and level surface.
- Visually inspect the
impeller and check for
centralised revolution.
- Using a hand spanner, adjust
the legs in turn until the heater
sits on all four feet.
- Remove the fan guards and
casing lid and check that the
impeller grub screws are tight.
The Impeller does
not spin
Immediately isolate the heater from
the power supply.
-
Inspect all electrical
connections.
-
Open the Ex d enclosure
and check if the MCB is in
the open position.
-
Tighten any loose connections.
-
Switch the MCB to the closed
position.
The impeller
spins clockwise
(looking from fan
end) (3 Phase
heaters only)
Immediately isolate the heater from
the power supply.
-
Access the Ex e enclosure
and ensure that phase
numbering is correct.
-
Swap the cables between two
of the incoming phases, L1 and
L2 only.
There is no heat
Isolate the heater from the power
supply.
-
Check the wiring of the
heating elements.
-
Remove the element
connection cable and
check the resistance values
of each phase.
Ensure you are using the correct wiring
diagram in section 12.
-
Tighten any loose connections.
-
If an imbalanced reading is
found, or an infinite value,
contact EXHEAT Industrial Ltd.
The Heater
suddenly
de-energises
Immediately isolate the heater from
the power supply.
-
Check the ambient has not
exceeded 40°C.
-
Check for any signs of
damage.
-
Check for any electrical
fault.
-
Open the Ex d enclosure
and check if the MCB is in
the open position.
-
Undertake a 6 monthly
inspection of the equipment to
ensure no fault.
-
Switch the MCB to the closed
position.
A rattle or other
unusual noise
Isolate the heater from the power
supply.
-
Check all fasteners are
tight.
-
Check for signs of scuffing
between the impeller and
casing.
-
Using hand tools, tighten any
loose fasteners.
-
Take out of service and contact
Exheat Industrial Limited.
