Hitachi RAS-2-HVNP Service Manual page 166

6. Optional functions
RAS-3HVNPE / RAS-(4-12)H(V)N(P/C)(E)
1 Fixing operation mode (heating / cooling)(1/2)
This input function is fixed in terminals CN1 or CN2 of the PCB of the outdoor unit, to use it as a cooling and heating mode.
CN1 must be set up as follows.
Short circuit between the terminals 1 and 2 of CN1: set heating mode.
Short circuit between the terminals 2 and 3 of CN1: set cooling mode.
After having pre-fixed the established mode, the remote control can only be used to adjust the temperatures. Stoppage
code "d1" "20" will be displayed if an attempt is made to change the operation mode of any of the indoor units with the
remote control.
Example of wiring diagram of fixing the operation mode.
A
• A: 3P connector cable.
• X1: Cooling.
• X2: Heating.
• SS1: Fixing operation mode switch.
• SS2: Change over switch
2 Demand thermo OFF (3)
This is an input function to control the maximum power that the compressor can consume. When this option is turned on,
the outdoor units are stopped completely, and the indoor units go into thermo-OFF. Alarm "10" is displayed on the remote
control. If the switch of this function is disconnected it becomes available again.
Connect the cabling and use the materials as shown in
3 Forced stoppage (5)
This is an input function that turns on when the switch receives a signal that causes the compressor and the fan motor of
the indoor unit to stop; alarm "10" displays on a remote-controlled when this option turns on. If the switch of this function is
disconnected it becomes available again.
Connect the cabling and use the materials as shown in
4 Current control demand (6/7/8/9)
This is an input function that turns on when it detects that the frequency of the compressor reaches 60%, 70%, 80% or
100%.
The frequency of the compressor is determined when the maximum current reaches the established limit.
Connect the cabling and use the materials as shown in
If the running current of the outdoor unit exceeds the maximum limit, the unit changes to the thermo-OFF condition. Stop-
page cause code "10" will appear. When the input terminal is opened during the demand current control, the control of the
input terminal is reset.
152
SMGB0079 rev.0 - 01/2013
Outdoor unit PCB
Available ports.
Available ports.
Available ports.
Power
supply