Inspection And Maintenance (Guf-50-100Rdh4 Only); Preparation Before Cleaning - Mitsubishi Electric Fresh Master GUF-50RDH4 Betriebsanleitungen

3. High efficiency filters (Optional parts)
The high efficiency filters cannot be reused. Always replace with new
filters. For details, consult your dealer.
5. Inspection and Maintenance
If the unit is to be used for prolonged periods of time, please have the following items inspected by an authorized service office at intervals of
about once a year.
Be sure to turn off the isolator of the distribution board before conducting maintenance or inspection.
Part to be inspected
Strainer
Inspect for dust clogging.
Inspect for cracks in O-rings.
Humidifying elements
Inspect for water leakage from the sur-
face of each of humidifying element.
Inspect for dust and particles on the
surface of each humidifying element.
* Note 1: Replacement O-rings: Commercially available O-rings P22A and P20
* Note 2: A small amount of water may form through dew condensation, but it is not abnormal.

Preparation before cleaning

Mounting screw
Maintenance cover
(for humidifying)
Drain pipe
Discharge valve
Description of maintenance and inspection
Inspection item
Remove and clean the dust if clogged.
Replace the O-rings if cracked. *Note 1
Replace the humidifying element if
water spurts from its surface. *Note 2
If the air pathway is covered by dust
or particles, carefully clean it using a
vacuum cleaner, or wash it with water
by referring to the cleaning procedure
on page 12.
Service valve
Assembly after maintenance
Bearing in mind the following points, assemble the parts following
the sequence for their removal in reverse.
- Arrange the Lossnay core with the air filter side as shown in the
name plate on the Fresh Master.
Action to take
1. Close the service valve to prevent residual water from spat-
tering.
2. Take a countermeasure against water leakage.
- Water inside the humidifying elements will leak. Place a vinyl
sheet in the ceiling or take another countermeasure to pre-
vent water leakage.
3. Drain the residual water from the pipe.
- Place a bucket or other container under the discharge valve
and open the valve to collect the residual water in the pipe.
4. Remove the maintenance cover (for humidifying).
- Remove the seven mounting screws, slide the maintenance
cover to the right, and remove it from the potbelly-shaped
holes (six locations for the GUF-50RDH4).
Possible consequence if main-
tenance is not conducted
Unable to humidify
Water leakage
Water leakage
Reduced airflow
Reduced humidifying power
11