System control Si18-201
158 Main Functions
Regarding target superheated degree SH
(Example) The following example is based on room A.
When the sum of heat exchanger temperature (DCA) and target superheated degree is
smaller than gas pipe lower limit temperature, the following condition is set: DSH = Gas pipe
lower-limit temperature – DCA.
When DLA < DCA (when liquid pipe temperature is exceeded due to heat exchanger
intermediate superheating), the motorized valve is opened based on the fixed value
determined by QRSHA = (0.12 Nm³/hr), with QRSHA being the flow rate operating amount
(relative value) provided by the SH control.
In normal condition (DLA
≥
DCA), when SHA = (DGA – DCA) – DSH and the previous value
is SHAZ QRSHA = 0.05 × ((SHA – SHAZ) + 0.32 × (SHA + SHAZ))
= 0.05 × (SHA – SHAZ) + 0.016 × (SHA + SHAZ)
Where QRSHA
≤
QHENCS, QRSHA = QHENCS1
Notes: 1. In Sky Air models, the indoor units are equipped with distribution capillary tubes ; therefore,
the heat exchangers may superheat even when the condition is met.
2. In Sky Air models, the heat exchanger intermediate position is provided on the liquid
connection pipe side; as a result, superheated condition is difficult to detect.
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