Technical data

101
• Control systems
• intelligent Touch Manager • ED721208
Count Accuracy
(1) Cause of error
(System example)
Watthour meter
(with output)
Power supply
3 phase
#1 #2 #3 #4 #5 #6
#: Indoor unit's address
#7 #8
W2
W1
Outdoor unit
Tenant A Tenant B Tenant C
Legend
: Read on wattmeter
iTM
<Case of arising error>
➊ W1+W2
Count conclusive total for indoor unit #1~#8 Refer to the “REASON”
➋ W1 ≠ Count conclusive total for indoor unit #1~#5
W2 ≠ Count conclusive total for indoor unit #6~#8
Refer to the next page
➊ W1+W2
Count conclusive total for indoor unit #1~#8* : The reason to get and the error size
• REASON
iTM counts every one hour’s power consumption.
Though fraction in case of computation occurs at this time, it is computed after leaving off a 1-W figure to avoid the risk for the owners.
As a result, the error by the leaving-off occurs by 0.5W/ hour in average value as per each indoor unit.
(Calculation example)
(1) Count for errors in 8-day
 TenantA+B:0.5(Wh)×24hr×8days×5units=+0.48kWh
 TenantC:0.5(Wh)×24hr×8days×3units=+0.288kWh
 total=+0.768kWh
(2) Assuming that the reads on watthour meters are as follows:
 W1:readonwatthour meter =490kWh
 W2:readonwatthour meter =200kWh
   total =690kWh
(3) Finallyitisconcludedastotalerror=0.768/690×100=0.11%
➋ W1 ≠ Count conclusive total for indoor unit #1~#5 :
W2 ≠ Count conclusive total for indoor unit #6~#8 :