Hitachi RAF-25NH5 Instructions De Service page 205

FORCED COOLING
The following shows the operation state of forced cooling.
Power
Service switch
Unit 1
Unit 2
Heating output
Cooling output
Turns on
for cooling
Turns on
for heating
Outdoor fan
Operation
In-rush Prevention
Power
Approx. 100ms
Compressor
rotation speed
520
62.5pps
480
Unit 1
0
Hold 500ms
520
480
Unit 2
0
Hold 500ms
Service switch
Unit 1
Unit 2
Heating output
Cooling output
Turns on
for cooling
Turns on
for heating
Outdoor fan request
Operation
In-rush Prevention
Power
Approx. 100ms
Compressor
rotation speed
520
62.5pps
480
Unit 1
0
Hold 500ms
520
480
Unit 2
0
Hold 500ms
※
TSKTM1 and PSTART are EEPROM data.
See other sections for details of expansion valve TD control, ÆN correction and distribution control.
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1s
1s
1s
100ms
TSKTM1
[ ＜ ℃]
Outdoor temperature 40
PSTART
Initialization
[ ＜ ℃]
finished Outdoor temperature 40
PSTART
Forced cooling request from main
1s
1s
1s
100ms
TSKTM1
[ ＜ ℃]
Outdoor temperature 40
PSTART
Initialization
[ ＜ ℃]
Outdoor temperature 40
finished
PSTART
- 234 -
Forced cooling request
Forced cooling request
Lo
-1
4000min
TD control + △ N correction + distribution control
△
TD control + N correction + distribution control
Forced cooling request
Forced cooling request
Lo
4000min -1
△
TD control + N correction + distribution control
TD control + △ N correction + distribution control
Balancing request
Balancing request
30s
sub
15s +
Balancing for 3 minutes
80s
Balancing request
Balancing request
30s
15s
Balancing for 3 minutes
80s