Hitachi SAMURAI Series Service Manual page 59

2. Control Functions
Control of the cooling cycle
51
SMGB0082 rev.1 - 07/2015
(From previous page)
Fulfilment of conditions
to finish defrosting
Compressor forced load down
output
In fan operation
No
Fan 7 Hz order output
*Pd: High pressure
(COO72CN-3Pd)
Pd* ≥ 1.5 MPa
No
No
19 seconds have
passed since 7 Hz
order output
Yes
Fan maximum frequency operation start
Pd* ≤ 1.0 MPa
No
No
60 seconds have
passed since maximum
frequency
Yes
Switching of 4-way valve
Compressor startup unload output
60 seconds count
Defrosting control release
Yes
Yes
Yes
2