Hitachi RAS-10FSXN - Excessive High Discharge Air Temperature Prevention Control

Temperature conditions under defrosting operation:
A: Outdoor evaporating temperature °C.
B: Defrost operation stop area.
C: Outdoor temperature °C.
D: Defrost operation start area.
5.2.9
Excessive
high discharge air temperature prevention control (only for RCI, RCD and
RPI (≤ 6 HP))
No
Yes
Yes
No
Thermo ON/OFF Control of Indoor Unit
Thermo-OFF
Thermo-ON
Heating Operation
Discharge
Air T
emp. of
Indoor Unit
Is it continuous
more than 3 min.?
Discharge Air Temp.
of Indoor Unit
Is setting temp.
lo
w
er than inlet air temp.
of Indoor Unit?
10
5
0
15
-6
-10
-10 -5
-15
-15
-2
5
6
10 15
-21
A
B
D
C
5 Control system
105
SMGB0065 rev. 1 - 12/2010
5