Nortec MH Series - Manual (Page 75)

Troubleshooting | 72
General Troubleshooting
The following section provides general guidelines for troubleshooting the MHTC/B humidifier
and auxiliary components. For detailed troubleshooting information refer to the manuals that
were provided with the auxiliary equipment, to Table 6: Troubleshooting Warnings and Faults,
and to Error! Reference source not found. later in this chapter.
Table 5: General Troubleshooting
MH Unit
Problem Cause Solution
Residual water in the section
of the duct behind
(downstream) the NORTEC
MH
1 Air velocity through the media boxes is
too high.
Reference
Units without mist eliminator max. (750
fpm) 3.8 m/s.
Units with a mist eliminator max. 1082
fpm (5.5 m/s).
1 Install mist eliminator or
reduce air velocity in the
duct.
2 Water drain is leaking.
2 Check/seal water drain.
Humidity/cooling demand
present however the NORTEC
MH does not humidify.
1 Shut-off valve in the water supply line
closed.
1 Open shut-off valve.
2 Reflow models: circulation pump
defective.
2 Replace circulation pump.
Maximum
humidification/cooling
Capacity is not reached.
1 System incorrectly dimensioned
(insufficient capacity).
1 Contact your NORTEC
supplier.
2 Unit improperly configured. 2 Check unit configuration.
3 Safety opens intermittently. 3 Defective sensors.
4 Inlet temperature low. 4 Increase the temperature of
the air passing through the
MH.
5 Insufficient water supply capacity
5 Check water supply, increase
water pressure.
6 Models with MH control unit: output
limitation active.
6 Deactivate output limitation
(see separate operating
instructions for MH control
unit).
Pump running (>5 min.)
however no water out of
staging valves. 1 Blockage in the bypass tube in the
manifold block preventing the pump
from purging air from the system.
1 Check for dirt or debris in the
bypass tube in the manifold
block. Use a small wire or
pipe cleaner to clean the
bypass channel in the
manifold block (stage 2 valve
will need to be removed).