Daikin J Series Service Manual Page 81

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System control SiE18-201
70 Main Functions
3.6.2 BP Unit Command Conversion
1. D (room temperature temperature setting) signals from BP units are converted to α
values.
D signals from BP units are used as the α value in frequency commands (excludes when
Powerful function is in operation).
2. Processing during Powerful operation mode
(1) When Powerful command is received from indoor units (one or more units)
(2) Thermostats are not OFF in room units from which Powerful commands are issued
When the above conditions are met, the Powerful operation mode is activated, and the
following processes are conducted.
(3) Based on the α value determined by D signal from indoor unit, the following calculation is
performed.
α value = α value + α PWR
3. Determination of S value
There are two types of indoor unit capacities from individual BP units. One is the ΣS value of the
connected indoor unit, and the other is the ΣS value of the indoor unit which receives an
operation demand for the same mode as that of the outdoor unit. They are called H/U
connection ΣS value and BP operation ΣS value, respectively. The sums of those S values of
BP units are called outdoor unit connection ΣS value and outdoor unit operation ΣS value.
In this manual, outdoor unit connection ΣS value is referred to as ΣS value, and outdoor unit
connection ΣS value is referred to as ΣS value.
D Signal α Value
Temperature
Difference
000Thermostat OFF
100.5
211.0
321.5
432.0
542.5
653.0
763.5
874.0
984.5
A95.0
BA5.5
CB6.0
DC6.5
ED7.0
FE7.5 Regarding thermostat OFF
Temperature difference between BP thermostat OFF
point and room temperature
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