Daikin R407C PLUS - Page 63

Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
52 Function R407C PLUS Series Heat Recovery System
3.1.4 Correction of Td with Outdoor Temperature
!
When the outdoor temperature is low, the following correction is conducted to cope with
temperature drop at the temperature sensor (due to cooling by outdoor temperature) or
expanding difference between discharge port temperature inside the compressor and
detected discharge temperature.
Contents
!
When outdoor temperature (Ta)
≤
5°C, the following correction is conducted.
HTdi, HTds1,2 = Value detected Tdi, Tds1,2 + 0.5 x (5.0 - Ta)
The correction factor must be a minimum of 0 deg. and a maximum of 10 deg.
!
Specify HDSHi and HDSHs1,2 for the discharge superheat degree to calculate using the
corrected discharge pipe temperature as shown above.
HDSHi=HTdi-Tcg
HDSHs1=HTds1-Tcg
HDSHs2=HTds2-Tcg
3.1.5 Malfunction Stop by Reverse Phase
!
When the power supply is connected in reverse phase, detects the reverse phase and stops
operation to prevent a damage of scroll compressor due to turning reverse.
Contents
!
Detects reverse phase
→
Stops operation by reverse phase (U1)
Remarks
!
Detects reverse phase to protect commercial power supply compressor
Correction
range
10˚C
0˚C
5˚C0˚C-5˚C-10˚C-15˚C
(V2557)