Nortec NHDI - Manual (Page 24)

REPLACING UNIT FUSES
Warning! Before replacing the unit fuse the
steam humidifier must be switched off and
secured against unintentional re-connection. Take
care that the electricity supply to the main contactor is
disconnected (check with voltage tester).
Warning! Electronic components are very
sensitive to electrostatic discharge. To protect these
components, measures must be taken against
damage from electrostatic discharge when replacing
the unit fuse (ESD protection).
The unit fuses may only be replaced by trained
and qualified personnel.
Important! If the unit fuse blows this is generally
due to a faulty unit component. Therefore you should
check these components before replacing the fuse
(see table below).
Only use the correct type of fuse according to the
following table.
Warning! It is not permitted to use repaired fuses.
Fuse Specification Before replacing,
check
F1 on supply
module 6.3 A,
slow-acting Drain pump (blocked
or coil faulty)
F2 on supply
module 1 A,
quick-acting Inlet valve (blocked
or coil faulty)
F5 on control
board 50mA,
quick-acting Control signal
RESETTING FAULT INDICATION “ERROR”
In order to return the steam humidifier to operation
after fault indication error, you must press and hold
down the drain switch while turning the unit in the off
position for approximately 10 seconds. Then turn the
unit switch back on and release the drain switch after a
10 second interval.
HEATING ELEMENT REPLACEMENT
INSTALLATION INSTRUCTIONS
1. Drain unit.
2. Turn off the unit, and disconnect primary
power to the unit.
3. Open the plumbing door.
4. Let unit tank cool down if needed.
5. Remove steam hose by loosening gear clamp.
6. Disconnect temperature switch. Note there is
no polarity with this cable.
7. Remove gear clamp and remove tank from the
unit
8. Undo cylinder tank strap and remove tank
from unit.
9. Remove lid clamp, open lid and identify
heating elements to be replaced.
10. Remove the nut, washer, plug and gasket
from the top of heating element you are
replacing. Note: Save the hardware for
installing the new heating element.
11. Note the heating element orientations, and
remove heating element by pulling it down
through the lid.
12. Place gasket from step 15 on new heating
element and install new heating element by
inserting it into the lid from the bottom
ensuring orientation matches previous heating
element.
13. Re-install gasket, plug, washer, and nut.
Tighten assembly
14. Connect element pins into the male connector
by pushing in the pins and they should lock
into place, pull to ensure.
15. Ensure all heating element fastening nuts are
tight.
16. Re-install cylinder tank lid, clamp on cylinder
and re-install the tank in the unit. Take care to
ensure that the tank is level in the base and
that the connecting components are aligned.
17. Fasten the cylinder into position using the
cylinder strap.
18. Re-connect steam hose and clamp to steam
output coupling.
19. Connect female connector to the male
connector.
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