Hitachi RAM-90QH5 Service Manual page 41

When one unit is operated for heating
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
[NDWN_ON]
[NDWN_OFF]
Turns on
for heating
Outdoor fan
Compressor
rotation speed
20 sec 20 sec
480
0
480
0
480
0
480
0
480
0
—1
Decreases by 100 min /30 sec.
30 sec 30 sec 30 sec
– 50 –
Heating
Increases by 50 min
30 sec 30 sec 30 sec 30 sec
—1
/30 sec.
20 sec 20 sec