Hitachi RAF-25NH4 Données Techniques page 123

MODEL RAM-70QH4
RAM-80QH4
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 / TSTKTM1 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
Rush-in
prevention
Power
100ms
approx. 100ms
Compressor
Start enabled
rotation speed
Hold
520
480
Unit 1
0
Hold 500ms
520
480
Unit 2
0
¥ See other sections for details of expansion valve TD control, ÆN correction and distribution control.
※
¥ TSKTM1, SDRCT1, SDSTEP, TSKSPT, CMAX2, PSTART and PSTARTH are EEPROM data.
¥ Unit 3 and 4 operation is the same as unit 1 and 2.
However, the outdoor unit fan is operated with the type A compressor.
¥ Wiht RAM-70QH4, type B compressor operates unit 3 only.
1s
1s
TSKTM1-C
SDRCT1-C
31.25pps Outdoor temperature
「
Hold
Initialization finished
Hold
Outdoor temperature
「
Hold
Hold 500ms
Cooling
Cooling
Start sequence
SDSTEP rpm /
TSKSPT sec.
40ûC
≧ 」
PSTARTC2$
40ûC
≧ 」
PSTARTC2$
142
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CMAX2