Overhauling Procedures - Mitsubishi Electric Lossnay VL-220CZGV-EB Handbook

10. Overhauling procedures

Work precautions
• Before replacing parts, repair troubled sections according to the instructions described in the troubleshooting.
• When servicing, always keep proper footing.
• When servicing, always turn off the power supply isolator. Pay sufficient attention to avoid electrical shock or
injury. Even after the power supply isolator is turned off, the capacitor on the circuit board retains high volt-
age for a while. Therefore, before servicing, wait for at least five minutes, and then use a tester to check that
the voltage has dropped.
• Once the power supply is turned off, be sure to wait for at least five minutes before turning the power back
on again.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• If it is thought that there is a circuit board malfunction, check for disconnected wires in the print pattern,
burnt parts or discoloration.
• If the circuit board is replaced, make sure that the switch settings on the new board are the same as the old
board.
• 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.)
<Internal view and major components>
EA: Exhaust air
SA: Supply air
SA fan assembly
Bottom casing
EA fan assembly
Control unit
Drain pan
Lossnay core
─ 30 ─
RA: Return air
OA: Outside air
Filter assembly (RA)
Filter assembly (OA)
Thermistor