SiEBE18-526 Basic Control
Function 57
∆D Control Receiving the capacity request signal from the indoor unit, the outdoor unit corrects its target
pressure for capacity control.
Controls ∆D signal from indoor unit as follows.
UP control : When the UP command come from more than one indoor unit among
thermostat-ON indoor units.
Down control: When the down command come from all indoor units among thermostat-ON
indoor units.
Keep control: Except for the above
About detail of ∆D signal, refer to P75
Cooling Operation
TeS = TeS initial value + KTe2
KTe2 : Correction value by ∆D signal in cooling.
∆ D control
Keep the current KTe2
KTe2 = KTe2 – 0.5 KTe2 = KTe2 + 0.5
(Q0396)
During compressor frequency PI
control (KTe2 = 0)
Not during compressor frequency PI
control
KTe2 = 0
(without correction)
Up control by ∆ D signal
continues 120 sec.
Down control by ∆ D signal
continues 120 sec.
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