Mitsubishi Electric GUG-02SL-E Operating Instructions Manual page 11

Maintenance
For prolonged use, ask your dealer to perform the following inspections about once per year.
When the unit is used for several years, its inside becomes dirty and the performance impairs. This
often causes foul odors as well as water leakage from and malfunctions on the unit, and clogging
in the drain hose due to dirt and dust.
Before performing inspection and maintenance, turn the unit's main power supply OFF by the circuit breaker. (This prevents the
protective mode from being activated during inspection.)
Inspected parts
Water drainage performance.
Pump inlet port for dirt or dust.
Drain pump
Precautions When Cleaning Drain Pan and Drain Pump
• Do not use solvents such as thinner, acidic, alkaline detergents or nylon scrubbing brushes. (Failure to heed this warning will degrade the
plastic.)
• If cutting oil or other oil is adhering, wash off with sufficient water. If the drain pan is particularly dirty, clean with a neutral detergent. Then
thoroughly wash off the detergent. (Remaining detergent will degrade the plastic.)
• Do not use detergent or water with 40 ºC or higher. (Failure to heed this warning may lead to deformation.)
How to Clean around Drain Pump
Drain pan Drain pump
Replacement of the Drain pump
• The drain pump is a consumable part and must be replaced.
• Replace the drain pump when stopping operation due to the shortage of pumping. (Expenses must be borne by the customer.)
• After operating the unit in cooling mode for 2,100 hours (approximately five years), the LED on the circuit board blinks. Perform inspection and
replace the drain pump, if necessary. For details on work procedures, see the Installation Manual.
• When assembling, do not twist the hose.
• Consider the indicated operation hours as a guide for the replacement.
It is based on the use of ten hours per day or 420 hours per year, which is the equivalent of two months, in the cooling mode.
Note: The above hours does not indicate the term of guarantee.
Consider for early replacements if operating the unit at the following sites:
• Locations with high temperature/humidity or the change of it is severe
• Locations where the power fluctuates (such as voltage, frequency or wave form distortion) severely. Never use the unit outside the tolerance.
• Locations where oscillation or impulse is severe
• Locations with a large amount of dust or salt
• Locations where power supply starts/stops frequently, or for prolonged operation (e.g. 24 hours of air conditioning)
Eng-10
Maintenance and inspection
Inspection items
If dirt or dust is found, wipe the recess on the drain pan
surface, suction area, and pump inlet port clean. If the drain
pump is particularly dirty, replace parts. If water drainage
performance has been impaired after cleaning, replace
parts.
Screw
Maintenance cover
Corrective action
1. Remove the maintenance cover.
(7 screws for GUG-01, 02SL-E, 6 screws for GUG-03SL-E)
2. Wipe off any dirt or dust adhering to the recess on the drain pan
surface, suction area, and pump inlet port or for drain blockage.
3. After wiping clean, rinse with sufficient water (approx. 1,000 cc).
Turn the unit power supply ON. Check if water is drained by
controlling the drain pump trial operation switch (set unit circuit
SW11-1 to ON).
* Do not to lose removed screws.
If maintenance is neglected
Defective water drainage