Hitachi FSG Series Service Manual page 167

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WARNING: TURN OFF all power source switches
6. Suspend the cleaning water collector from the indoor unit.
a. Connect a rope to the suspension bracket of the indoor
unit put is downwards.
b. Insert the support bar into the cleaning water collector
hole.
c. Suspend the cleaning water collector with the rope from
the indoor unit.
d. Connect a hose to the boss for the cleaning water
collector and put the other end in a bucket.
7. Spraying Cleaning Water
Spray the cleaning water over the fins of the heat
exchanger.
8. Cleaning with Clean Water
Insert the spray nozzle through the hole of the cleaning
water collector.
Operate the pump and clean the fins with clean water.
Adjust the water pump pressure so as not to damage the
fins.
NOTE:
If the cleaning water remains, fins will be corroded.
Adjust the pressure of the pump at 2.5 to 5.0 kg/cm² so as
not to damage fins.
9. Attach the fan assembly and drain pan after cleaning is
completed and dropping of cleaning water is stopped.
10. Check the insulation of drain-up pump by megohm-meter.
Check to ensure that the insulation is greater than 1 MW
when 500V is applied.
11. Connect the wiring as it was. Mount the air distribution
chamber and optional air panel
12. Neutralization Treatment after Cleaning
The cleaning agent specified in the item, 2.10.1 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.
Indoor Unit
Rope
Suspension Bracket
Hose
Bucket
2
SERVICING
53
Support
Bar
Cleaning
Water
collector
Boss
Hose
Bucket
Nozzle
Spray
Pump