117
• Control systems
• intelligent Touch Manager • ED721208
iTM 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 cannot be drawn out from
the computing.
(1) Combination rate of indoor units connected to an outdoor unit (100%)
(2) Outdoor air temperature
( 35°C)
(3) Indoor unit’s suction air temperature
( 19°C)
(4) Piping length
( 5m)
(5) Level difference
( 0m)
(6) Pipe diameter
(f22.2)
(2) The way to reduce errors
The error
➊
cannot be reduced, however this error is small and negligible, therefore so it can generally clear troubles if excusing the reason
caused to tenants.
The way to reduce the error
➋
will be described as follows.
As shown in the drawing below, when the relation between a watthour meter and indoor units are clear, “Power group setting” for each
watthour meter can reduce the error.
On the above example, watts at W1 and watts at W2 are shared by indoor units #1~#5 and indoor units #6~#8, respectively.
The above setting results in the followings:
#1
#2
#3
#6
#7
#8
#4
#5
W1
W2
iTM
W1 Count conclusive total for indoor unit #1~#5
W2 Count conclusive total for indoor unit #6~#8
Caution:
If management staff checks the watts in the procedure mentioned below, they would find the calculation to be incorrect due to an
uncompleted cycle.
Example:
(1) May/24th, read watthour meter and records the watts at 10:00 am
(2) June/24th, read watthour meter and records the watts at 10:00 am
(3) When the count in a period of May/24th to June/23rd is printed out, the total value does not meet the value detected mentioned
above on (2) - (1).
5/24
0:00
10:00
10:00
23:59
5/24
6/22
6/24
iTM stores the information collected in a period of 0:00 am through 23:59 pm as one day information as shown above.
It results in the fact that there are ten hours gaps between on the first day of the counting and on the last day of the count in the above
mentioned column of “Result of detection by management staff” and “Count result”.
As shown in the figure above, this error increases in the season from the intermediate forwarding to the season in which air-conditioning
is highly required.
For more accuracy, it is necessary to compare with the value detected at 0:00 am.
Outdoor unit
Tenant A
Tenant B
Tenant C
Power supply
3 phase
Result of detection by management staff
Count result of iTM
Detection (1)
Detection (2)
Large
Little
Summary of Contents for brp069a42
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