Hitachi UTOPIA RAS-4HVRP2E - Defrost Operation RAS-(4-6)H(V)(R;N)(C;P)2 E

5 Control System
Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E
SMGB0136 rev.0 - 07/2021
101
5
5.5.5 Defrost operation RAS-(4-6)H(V)(R/N)(C/P)2E
I.U. :
:
Heating
Operation
Indoor Unit
Actuator
(*)
(*) Refer to Service Manual for the timing diagram of the reversing valve.
Yes
No
(*)
No
Yes
Yes
No
Yes
No
Defrosting
Start Condition is
approved
Power to
RVR
: OFF
"DEFROST" Indication
Defrost Operation
Defrosting
Stop Condition is
approved
"DEFROST" Indication: OFF
Heating Operation
Pd < 261 psi
(1.8MPa)
Elapsed Time:
≥ 3min.
IU Air Outlet Temp.
< 77°F
(25°C)
≥ 86°F
(30°C)
MIF
Operation at Slo Fan
Speed
≥ 77°F (25°C) and
< 86°F (30°C)
Power to
RVR
: ON
MIF
Operation at Low Fan
Speed
MIF
Operation at Set Fan Speed
MOF
Operation: ON
MOF
Operation: OFF
MIF
Operation: OFF