Hitachi

Control Wiring Termination

In some cases with relatively big HVAC systems, where the total length of the wiring is high, control wire termination may be required. Termination can also be helpful if a control communication is noisy as a result of external electromagnetic influence. Termination can be easily made on CoolMasterNet side. To do it turn ON DIP Switch S2 - for line L1 and/or S3 - for line L2 as shown below. Rest of the DIP Switches should not be changed.

Malfunction Code	Category	Content of Abnormality	Leading Cause	Cool Automation Encoding
01	Indoor Unit	Activation of Protection Device (Float Switch)	Activation of Float Switch (High Water Level in Drain Pan, Abnormality of Drain Pipe, Float Switch or Drain Pan)	01	01
02	Outdoor Unit	Activation of Protection Device (High Pressure Cut)	Activation of PSH (Pipe Clogging, Excessive Refrigerant, Inert Gas Mixing)	02	02
03	Transmission	Abnormality between Indoor and Outdoor	Incorrect Wiring, Loose Terminals, Disconnect Wire, Blowout of Fuse, Outdoor Unit Power OFF	03	03
04	Transmission	Abnormality between Inverter PCB and Outdoor PCB	Inverter PCB - Outdoor PCB Transmission Failure (Loose Connector, Wire Breaking, Blowout of Fuse)	04	04
04	Transmission	Abnormality between Fan Controller and Outdoor PCB	Fan Controller - Outdoor PCB Transmission Failure (Loose Connector, Wire Breaking, Blowout of Fuse)	04	04
05	Supply Phase	Supply Phase	Incorrect Power Source, Connection to Reversed Phase, Open-Phase	05	05
06	Voltage	Abnormal Inverter Voltage Abnormal Fan Controller Voltage	Outdoor Voltage Drop, Insufficient Power Capacity	06	06
07	Cycle	Decrease in Discharge Gas Superheat	Excessive Refrigerant Charge, Failure of Thermistor, Incorrect Wiring, Incorrect Piping Connection, Expansion Valve Locking at Opened Position (Disconnect Connector)	07	07
08	Cycle	Increase in Discharge Gas Temperature	Insufficient Refrigerant Charge, Pipe Clogging, Failure of Thermistor, Incorrect Wiring, Incorrect Piping Connection, Expansion Valve Locking at Closed Position (Disconnect Connector)	08	08
0A	Transmission	Abnormality between Outdoor and Outdoor	Incorrect Wiring, Breaking Wire, Loose Terminals	10	0A
0b	Outdoor Unit	Incorrect Outdoor Unit Address Setting	Incorrect Outdoor Unit Address Setting	11	0B
0C	Outdoor Unit	Incorrect Outdoor Unit Main Unit Setting	Two (or more) Outdoor Units Set as “Main Unit”	OC	OC
11	Sensor on Indoor Unit	Inlet Air Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	11	11
12	Sensor on Indoor Unit	Outlet Air Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	12	12
13	Sensor on Indoor Unit	Freeze Protection Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	13	13
14	Sensor on Indoor Unit	Gas Piping Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	14	14
19	Fan Motor	Activation of Protection Device for Indoor Fan	Fan Motor Overheat, Locking	19	19
21	Sensor on Outdoor Unit	High Pressure Sensor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	21	21
22	Sensor on Outdoor Unit	Outdoor Air Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	22	22
23	Sensor on Outdoor Unit	Discharge Gas Thermistor on Top of Compressor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	23	23
24	Sensor on Outdoor Unit	Heat Exchanger Liquid Pipe Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	24	24
25	Sensor on Outdoor Unit	Heat Exchanger Gas Pipe Thermistor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	25	25
29	Sensor on Outdoor Unit	Low Pressure Sensor	Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short Circuit	29	29
31	System	Incorrect Capacity Setting of Outdoor Unit Indoor Unit	Incorrect Capacity Code Setting of Combination Excessive or Insufficient Indoor Unit Total Capacity Code	31	31