Daikin R407C PLUS Service Manual page 94

Si33-105
3.5.8 Drooping due to Outdoor Temperature
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Purpose
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Contents
3.5.9 Demand Control
Forcibly reduces the outdoor unit capacity based on an external contact input (demand input) to
decrease power consumption. The following three types of demand control are provided.
Demand control 1
Demand control 2
Demand control 3
RSXYP16KJ
RSXYP18KJ
RSXYP20KJ
RSXYP24KJ
RSXYP26KJ
RSXYP28KJ
RSXYP30KJ
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Function R407C PLUS Series Heat Recovery System
Outline of Control (Outdoor Unit) < Symbols using in this manual >
When the outdoor temperature is high, the temperature inside inverter box does not reach to
the reference value. Therefore, conducts forced drooling.
Provide upper limit compressor operation frequency based on the following conditions.
Normal operation
Note) Inv_A : Current sent from inverter
Compressor upper-limit
frequency
A
B
All compressors in stop mode
Upper-limit frequency (A)
Model
INV STD1
46Hz +ON
52Hz +ON
52Hz +ON
87Hz +ON
87Hz +ON
33Hz +ON
33Hz +ON
Other protection control functions have precedence over the above operations.
Optional PCB is required for this control. (DTA104A61, 62)
Ta≥39˚C
OR
Set the upper limit compressor operation
Inv_A≥28A
frequency to the frequency shown below.
20HP model or lower (in 2 compressor system)
= 87Hz + ON
24HP model or higher (in 3 compressor system)
Ta<37˚C
&
= 87Hz + ON + ON
Inv_A<25A
Capacity reduction guideline
Reduces power consumption to approx. 70%
Reduces power consumption to approx. 40%
Forced thermostat OFF
STD2
— RSXYP16KJ
— RSXYP18KJ
— RSXYP20KJ
+OFF RSXYP24KJ
RSXYP26KJ
+OFF
RSXYP28KJ
+ON
RSXYP30KJ
+ON
Upper-limit frequency(B)
Model
INV STD1
52Hz +OFF
62Hz +OFF
62Hz +OFF
79Hz +OFF
79Hz +OFF
33Hz +ON
33Hz +ON
(V2583)
STD2
—
—
—
+OFF
+OFF
+OFF
+OFF
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