MITSUBISHI ELECTRIC PFD-P250 • 500VM-A - Manual (Page 10)

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10. Checking Drainage
Check that water is able to drain smoothly. If water is unable to drain smoothly, check for blockage of the grooves in the drain pan and the piping trap by paper particles etc.
Carefully clean the grooves in the drain pan and the piping trap to prevent further blockage.
Ensure that the trap is always water-sealed.
11. Checking V Belts
1. Adjust parallel of the fan and motor pulleys in accordance with Fig.B-1.
2. Adjust the tension of each V belt so that the deflection load (W) at the optimum deflection ( r= 5 mm) is as shown in Fig.B-2.
3. It is recommended that the belt be adjusted to the optimum tension as shown in Fig.B-2 after it has been run-in on the pulley (24 - 28 hours operation). When a new belt
is fitted, adjust the deflection load (W) to approximately 1.3 times the maximum value.
4. It is recommended that the V belt be replaced every 8000 hours. It has reached the end of its life when it has stretched by approximately 2% (including an initial stretch
of approximately 1%) of the initial circumference.
[Fig. B-1] (P.4)
12. Cleaning the Indoor Unit Heat Exchanger
When dust adheres to the heat exchanger after the unit has been used for a long time, reducing the efficiency of heat exchange, and resulting in deterioration of cooling
performance.
Please ask your dealer how to clean it.
13. Greasing the Fan Bearings
Replenish bearing grease annually to ensure that the bearings may be used with
confidence a long time. Such replenishment extends the life of both the grease and
the bearings. Use the following grease. Shell
Quantity Albania Grease 2
10.5 g
14. When the Unit is to be out of Use for a Long Time
(1) Run the unit in Fan mode for a period of 4 - 5 hours to dry the indoor unit.
(2) Turn the indoor unit power OFF.
s s s s s Check the following (1) - (4), then turn the power supply on.
(1) Clean and fit the filter.
(2) Check that the inlets and outlets on the indoor and outdoor units are not blocked.
(3) Check that the earth wire is connected. The earth wire may be connected with the indoor unit as well in some cases.
Caution:
Do not connect the earth wire to gas pipes, water pipes, lightning rods, or telephone earth wires. If earthing work is not conducted carefully it may result in
electric shock, smoke, flame, or mis-operation due to electrical noise. Please ask your dealer before beginning earthing work.
(4) Check to ensure that the drain hose is not bent, the tip is not raised or blocked, and that the trap has not been damaged, and fill the trap with water.
(5) Turn the power supply on before 12 hours or more.
Parallel
Pulley
Cast iron pulley
K (minutes)
10 or less
Remarks
Equivalent to 3 mm displacement per meter.
[Fig. B-2] (P.4)
A Deflection load (W) 3 - 4kg