Overhauling Procedures - Mitsubishi Electric LGH-250RVXT-E Handbook

7. Overhauling procedures

Work precautions
• When touching the electric components such as circuit boards and fan motors, do not touch the components
for more than 5 minutes after power-off, and then start working. If LED4 on the circuit board is lit, do not
touch the electric components.
• Before replacing parts, repair troubled sections according to the instructions described in the troubleshooting.
• When servicing, always keep proper footing.
• When servicing, the power supply isolator must be turned off. Pay sufficient attention to avoid electrical
shock or injury.
• Always connect the power wire properly.
• After completing repairs, check that the unit operates properly.
• Always wear gloves when servicing.
The part names in the texts are standardized with the part names in the parts catalog. (There are some
exceptions.)
<Names of the components>
Maintenance cover
Hinge
Damper plate
Fix piece
Hinge
Air filter for OA
Damper plate
Lossnay core
LGH-150RVXT-E: 2 pieces
LGH-200/250RVXT-E: 3 pieces
( 1 ) Turning power off
1 Shut down the unit.
2 Turn off the power supply isolator.
Precaution
When servicing, power supply to M-NET must be turned
off. Live-line working may cause a circuit board failure.
( 2 ) Fan parts
1 Unscrew the black screws (three special screws 4×8,
indicated by ) to remove the cover plate.
Control cover
Air filter for RA
Cover plate
Air supply fan (SA) (outside unit)
Maintenance cover (for the motors)
─ 35 ─
Air supply fan (SA) (inside unit)
Air exhaust fan (EA) (inside unit)
Air exhaust fan (EA) (outside unit)
OA: Outdoor air
RA: Return air
Control cover Cover plate