Hitachi RAS-4-HNC - 7. Test run

6. Optional functions
153
SMGB0079 rev.0 - 01/2013
6
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Output signals
Operation signal (01)
This optional signal is used to pick up the operation signal. It can be used to turn on or off complementary units of the air-
conditioning system,such as fans, humidiers, etc.
Connect the cabling and use the materials as shown in Available ports.
Note that the contact of auxiliary relay X3 is closed when an operation signal is issued.
Alarm signal (02)
This optional signal is used to pick up the activation of safety devices.
Connect the cabling and use the materials as shown in Available ports.
Note that the contact of auxiliary relay X3 is closed when an operation signal is issued.
Compressor on signal (03)
This optional signal is used to pick up the signal when the compressor is ON. It can be used to check how the compressor
is running at all times. It is very useful for locking the compressor when the fans are locked.
Connect the cabling and use the materials as shown in Available ports.
Note that the contact of auxiliary relay X3 is closed when an operation signal is issued.
Defrost operation signal (04)
This optional signal is used to pick up when defrosting turns on. It is very useful to check if the indoor unit is in thermo-OFF.
Connect the cabling and use the materials as shown in Available ports.
Note that the contact of auxiliary relay X3 is closed when an operation signal is issued.