User`s manual

ML180-MLT350 Dehumidifiers
190TGB-1034-A 5 Fault Finding 23
5 Fault Finding
5.1 General
The purpose of this chapter is to provide guidance in basic fault finding
and provide instructions for corrective actions so as to remedy faults.
Wiring diagrams can be provided to assist with fault isolation.
5.2 Safety
WARNING! Adjustments, maintenance and repairs may only be carried out by
qualified personnel who are aware of the risks involved during the maintenance
of equipment containing high electrical voltage and high machine temperatures.
5.3 Exchangeability
All electrical equipment in the electrical panel can be exchanged for
new components as provided in the list of components, see Circuit
Diagram Supplement.
The changing of rotors and/or rotor drive mechanism must be carried
out by Munters recommended and trained personnel.
The changing of reactivation heater must be carried out by Munters
recommended and trained personnel.
Drive belts and fans can be changed for one of the same type. After a
fan has been changed, the airflow must be adjusted and an operational
test must be carried out.
Switches and sensors can be changed to one of a corresponding type.
After a change an operational test must be carried out.
5.4 Fault localization
The LEDs alarm message shown on the control panel are the primary
source of information for finding faults when the unit has given an
alarm and stopped automatically.
Go through the following fault localization list below before contacting
Munters’ product service department. The list provides help in
identifying types of faults that are easy to remedy without the assistance
of specially trained personnel.
If the unit is equipped with RH98 Humidity Control System, see section
7.4.4, Process related alarms.