Hitachi RAF-25NH5 Instructions De Service page 191

ODEL RA -80QH5
Expansion valves
◇
¥ The expansion valves are initialized when power is supplied. The valve for unit 1 is fully closed (520
pulses), and then that for unit 2 is fully opened (480 pulses). When the valve 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, the TD control is entered. The start openings are set to PSTARTH when
the outdoor temperature at start 40ûC or more, and to PSTART when it is less than 40ûC.
Compressor rotation speed
◇
¥ When the compressor is started, the SDRCT1 speed / TSTKT 1 second is held.
After the steady speed period is finished, the speed increases at the rate of SDSTEP speed / TSKSPT
second until the target speed is reached.
Power
Unit 1
Unit 2
Heating output
Cooling output
Turns on
for cooling
Turns on
for heating
Outdoor fan
1s
Operation
1s
Rush-in
prevention
Power
100ms
approx. 100ms
Compressor
Start enabled
rotation speed
Hold
520
480
Unit 1
0
Hold 500ms Hold 500ms
Hold Hold
520
480
Unit 2
0
TSKT 1, SDRCT1, SDSTEP, TSKSPT, C AX2, PSTART and PSTARTH are EEPRO data.
※
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1s
TSKT 1-C
SDRCT1-C
31.25pps 31.25pps
Outdoor temperature 40ûC
「 ≧
Hold Hold
PSTARTC2$
Initialization finished
Outdoor temperature
「
Hold
PSTARTC2$
Hold 500ms
- 220 -
Cooling
Cooling
Start sequence
SDSTEP min / TSKSPT
-1
sec.
PSTARTC2K$
」
< TD control + ÆN correction + distribution control >
40ûC PSTARTC2K$
≧ 」
< TD control + ÆN correction + distribution control >
C AX2