Hitachi RPI-0.8FSG1 Service Manual page 272

SERVICING
(2.11 Cleaning Indoor Unit Heat Exchanger)
(9) Cover all components except the drain pan with a vinyl sheet avoid splashed cleaning water.
NOTE:
Wear gloves to avoid any injury during this
work due to sharp edge of fins.
(10) Spray the cleaning water over the fins from the rear side of the heat exchanger.
If the heat exchanger is heavily covered
with dust, use a brush to wipe off.
(11) Cleaning with Clean Water
(a) Operate the pump and clean the heat exchanger with clean water completely.
(b) Adjust pressure of the pump so as not
to damage fins.
NOTES:
1. If the cleaning water remains, fins will be
corroded.
2. Adjust the pressure of the pump at 2.5 to
5.0 kg/cm
(12) Check the insulation of the terminal board with a megohm-meter.
Check to ensure that the insulation is greater
than 1MΩ when 500V is applied.
(13) Check to ensure that water can flow smoothly after pouring water on the drain pan.
NOTE:
Pay attention to the drain pan not to overflow.
(14) Neutralization Treatment after Cleaning
The cleaning agent specified in the item 2.11.1 is of the neutral type. However, the cleaning water
after use may be not neutral. Collect all cleaning water and make necessary neutralization treatment
for the cleaning water.
2-132
TURN OFF all power source switches.
2 so as not to damage fins.
Vinyl Sheet, Tape, Cutter,
Tool
Phillips Screwdriver
Tool Spray, Brush
Tool Clean Water, Pump, Cleaning Water
Tool Megohm-Meter