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Page 51
2008-12-03
1.5 RESETTING THE MAINTENANCE INDICATION
When maintenance work has been completed the maintenance indication must be reset
on the unit models flow MHTC Flow, and MHTC Reflow (yellow LED lights). For that
purpose, please observe the information given in the separate operating instructions for the
MH control unit.
2.0 TROUBLESHOOTING
Important! Most operational malfunctions are not caused by faulty equipment but rather by
improper installation or disregarding of planning guidelines. Therefore, a complete fault
diagnosis always involves a thorough examination of the entire system.
2.1 TROUBLESHOOTING LIST
PROBLEM CAUSE SOLUTION
Residual water in the
section of the duct behind
(downstream) the Nortec
MH
Air velocity above the
humidification boxes is too
high. Units without mist
eliminator max. (750 Fpm)
3.8 m/s, Units with a 4”
(100 mm) mist eliminator
max. 885 fpm (4 .5 m/s),
with a 7.87” (200 mm) mist
eliminator max. 1082 fpm
(5.5 m/s).
Install mist eliminator or
reduce air velocity in the
duct.
Water drain is leaking.
Check/seal water drain.
Humidity/Cooling
demand present however
the Nortec MH does not
humidify.
Shut-off valve in the water
supply line closed.
Open shut-off valve.
Reflow Models: Circulation
pump defective.
Replace circulation pump.
Maximum
humidification/cooling
capacity is not reached.
System incorrectly
dimensioned (insufficient
capacity).
Contact your Nortec
supplier.
Insufficient water supply
capacity
Check water supply,
increase water pressure.
Models with MH control
unit: Output limitation
active.
Deactivate output
limitation (see separate
operating instructions for
MH control unit).