Daikin VRV III-S Technical Data Manual page 42

10 Explanations of Power Proportional Distribution
10 - 2 Count Accuracy
10 - 2 - 1Cause of error
• REASON 2
When airconditioners of all the tenants cease operation, the power consumption which were preliminarily registered to all the airconditioners are being
added as described on the section 10.1.1,3).
(Example)
In case of 2 HP indoor unit (FXCQ50M8), it brings the watts for one month during the ceased operation = 20 Wh × 24 hours × 30 days = 14.4 kWh.
But for the different case that 10 HP outdoor unit (RXYQ10P) is connected to three indoor units with 100 % combination rate, it will show as follows;
Outdoor unit
RXYQ10P one unit
Indoor unit FXCQ50M8
≠
W1 Count conclusive total for indoor unit #1~#5 :
≠
W2 Count conclusive total for indoor unit #6~#8 :
iPU counts the power consumption as the following conditions (1)~(6) for the standards. So, the gap to be raised from these conditions may cause the
error. Since these errors vary depending on the surrounded situations, the worst error value can't be drawn out from the computing.
(1) Combination rate of indoor units connected to an outdoor unit (100%)
(2) Outdoor temperature
(3) Indoor unit's suction air temperature
(4) Piping length
(5) Level difference
(6) Pipe diameter
•
Crankcase heater's
power consumption : 66 W
The watts at the ceased
operation (registered data) 20 W
(35°C)
(19°C)
(ø22.2 )
• VRV Systems • Network Solution
Monthly actual power consumption
of outdoor unit 47.52 kWh
(66
Monthly count value
43.2 kWh
(14.4
(5 m)
(0 m)
× ×
24 30 = 47520 Wh)
×
3 = 43.2 kWh)
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