Hitachi RAF-25NH5 Instructions De Service page 199

ORCED COOLING
¥ In order to accumulate refrigerant, units operate in cooling cycle.
Execution condition and operation status are shown below.
[Execution condition]
¥ With neither indoor unit 1 and 2 not operated, when forced cooling switch is turned ON, forced cooling will be performed.
¥ Always operation status of indoor units are monitored and forced cooling is inhibited when operation of any unit is detected.
[Operation status]
¥ Outdoor unit fan: ixed in LO.
¥ Compressor rotation speed: ixed in 3000min
¥ Expansion valve/reversing valve: Set in normal conditions.
[Note]
¥ During forced cooling, if failure occurs in outdoor unit, thermostat is turned off. However, it is not counted.
¥ Since rotation speed of compressor is fixed in 3000min
not performed.
¥ The following shows the operation state of forced cooling.
Power
Service switch
Unit 1
Unit 2
Heating output
Cooling output
Turns on
for Cooling
Outdoor fan
Operation
In-rush Prevention
Power
Approx 100ms
Compressor
rotation speed
520
480
Unit 1
0
Hold 500ms Hold
520
480
Unit 2
0
Hold 500ms
TSKTM1_C and PSTARTC2$ are EEPROM data.
※
All manuals and user guides at all-guides.com
.
-1
during forced cooling, compressor fixed speed control at start is
-1
1sec.
1sec.
1sec.
100ms
TSKTM1_C
Outdoor temperature 40
¥31.25PPS
[ ＜ ℃]
PSTARTC2$
¥Initialization
Outdoor temperature
finished
[ ＜
PSTARTC2$
Hold
- 228 -
orced cooling request
orced cooling request
Lo
3000min
-1
<TD control + N compensation + Diving control>
△
40
℃]
<TD control + N compensation + Diving control>
△
Balancing request
Balancing request
30sec.
15sec.
＋sub
Balancing period 3min.
80sec.