Hitachi RAS-25QH1 Technische Information Seite 99

BASIC MODE
} Expansion vaives
+ The expansion valves are initialized when power is supplied. The vaive for unit 1 is fully closed (520 pulses), and then that for unit 2 is
fully opened(480 pulses). When the vaive for unit 1 is fully closed (0 pulse), start-up is possible.
+ The start openings are held during the steady speed period when the compressor is started. After the steady speed period is finished,
theTD control is entered. The start openings are set to PSTARTH when the outdoor temperature at start 40°C or more, and to PSTART
when it is less than 40°C.
} Compressor rotation speed
- When the compressor is started, the SORCT1 speed/TSKTM1 second is held.
Aner the steady speed period is finished, the speed increases at the rate of SOSTEP speed/TSKSPT second until the target speed is
reached.
peaing output H
Cooling output
£i 1 Eee,
7
; H
i
7
t
}
H i
H
Compressor
rotation speed
pebagee <TD control + AN correction + distribution contro!)
a ARH
Expansion valve
eesaerk <TO control + AN correction + distribution contro' >
See bre
- 106 -
HITA-02911 / Druck:14