Forced Cooling - Hitachi RAF-35NH5 Service Manual

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
480
Unit 1
0
Hold 500ms
520
480
Unit 2
0
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
480
Unit 1
0
Hold 500ms
520
480
Unit 2
0
※
TSKTM1 and PSTART are EEPROM data.
See other sections for details of expansion valve TD control, ÆN correction and distribution control.
1s
1s
1s
100ms
TSKTM1
[
Outdoor temperature
62.5pps
PSTART
Initialization
[
finished Outdoor temperature
Hold 500ms
1s
1s
1s
100ms
TSKTM1
[
Outdoor temperature
62.5pps
PSTART
Initialization
[
Outdoor temperature
finished
Hold 500ms
Forced cooling request
Forced cooling request
Lo
4000min
＜ ℃]
40
△
TD control + N correction + distribution control
＜ ℃]
40
△
TD control +
PSTART
Forced cooling request from main
Forced cooling request
Forced cooling request
Lo
4000min
＜ ℃]
40
△
TD control + N correction + distribution control
＜ ℃]
40
△
TD control +
PSTART
- 234 -
-1
N correction + distribution control
-1
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