Hitachi UTOPIA RAS-4HVRP2E - External Input Function Setting

6 Optional functions
RAS-(4-6)H(V)(R/N)(C/P)2E
SMGB0136 rev.0 - 07/2021
127
6
6.2.2.3 External input function setting
The following signals can be received by the outdoor unit PCB1.

Fixing heating operation mode (Control function nº 1) / Fixing cooling operation mode (Control
function nº 2)
When the input terminals for setting the operation mode of the outdoor unit PCB1 are short-circuited, the operation mode
can be xed for cooling or heating mode.
• Short-circuit between terminals 1 and 2 (input 1) of the CN1 to x heating operation mode.
• Short-circuit between terminals 2 and 3 (input 2) of the CN1 to x cooling operation mode.
During the setting of heating (or cooling) mode, cooling (or heating) mode will not be available. The indoor units in
cooling or dry operation (or heating operation) will be switched to Thermo-OFF condition during the setting of the
operation, and stoppage code number “20” is given.
Setting example:
• Fixing Heating Operation at Input 1 (between 1 and 2 pins of CN1).
• Fixing Cooling Operation at Input 2 (between 3 and 2 pins of CN1).
a 3-pin connector
b Outdoor unit PCB1
c Control circuit
d Power source
X1 Auxiliary relay (cool)
X2 Auxiliary relay (heat)
SS3 Switch for xing the operation mode
SS2 Switch for changing the operation mode

Demand stoppage (Control function nº 3) / Forced stoppage (Control function nº 5)
When the input terminals for demand stoppage or forced stoppage on the outdoor unit PCB1 are shortcircuited while
running, the compressor(s) is stopped. The fan motor of indoor unit(s) is operated as shown below.
Demand Stoppage (Control Function Number 3) Indoor fan
Forced Stoppage
(Control Function Number 5)
Function Setting “FE”=0 Stop
Function Setting “FE”=1 Cooling: Airow Setting, Heating Lo Setting
• Short-circuit terminals 1 and 2 (input 3) of CN2 to set the stoppage demand.
• Short-circuit terminals 1 and 2 (input 3) of CN2 to set the stoppage forced.
• The stoppage code is number 10. By disconnecting the demand switch contact, restarting is available.
? NOTE
Incasethecontroldemand(ON/OFF)iscompleted,itisrecommendedthatthecontrol(ON/OFF)timecongurationissetaccordingto
theheatloadrecommendation.Alsosetthedemandcontroltimeoncein15minutes,theminimumtosaveenergy.
Setting example
• Demand Stoppage at Input 3 (between 1 and 2 pins of CN2).
• Forced Stoppage at Input 3 (between 1 and 2 pins of CN2).
a 3-pin connector
b Outdoor unit PCB1
c Control circuit
d Power source
X1 Auxiliary relay
SS3 Demand stoppage switch