LMC340i

Q: Why does the condensing unit not start?

Q: Why is the failure code 'Requesting data' active?

Q: Why has the high pressure switch cut out? (failure code C600)

Q: Why has the compressor overheat device cut out? (failure code C601)

Q: Why is the oil level too low? (failure code C602)
Q: Why are fan 1 or fan 2 or both overheated ( Failure code W603/W604/W605)

Q: Why is the external setpoint adjustment beyond allowed limits? (Failure code W606)
Q: A sensor, transmitter or a cable belonging to it is damaged (Failure code C607)
Q: Why is the Tdis limiter repeatedly activated? (Failure code C608)  
Q: Why is the FI current limiter repeatedly activated? (Failure code C609)
Q: Why is the FI current limiter repeatedly activated? (Failure code C610)

Q: Why is to, suction temperature repeatedly activated? (Failure code C611)

Q: Whys is the dual switch alarm? (Failure code C620)

Q: Compressor 1 failure (dual compressor mode) (Failure code C621)

Q: Compressor 2 failure (dual compressor mode) (Failure code C622)

Q: Why is the heat pump not working? (Failure code C623)

Q: Why is there liquids in the suction line (Failure code W624)

Q: Why is there liquids in the suction line? (Failure code C625)

Q: Why is there liquids in the discharge line? (Failure code W626)

Q: Multible liquid in discharge line (Failure code C628)

Q: Multible liquid in suction line (Failure code C629)

Q: How to copy parameter settings from one LMC340i to another LMC340i

Q: How to activate LMT license




Q: Why does the condensing unit not start?

 

A: There are several possibilities; however, the status information gives a good hint to what the problem is. See Status line on the Main menu.

1) Is the external signal set to On? The signal must be applied.

2) Is the unit in On mode? Set the unit in On mode.


3) Is there an active alarm that prevents start of the unit? Check the alarm list and solve possible alarms.


4) There has been an alarm and the unit is in restart – wait mode. After the restart timeout period of 10 min or 15 min the unit will make a restart attempt again – except in case of low oil level alarm. Check the alarm list and solve problems if there are any.

5) There is not enough charge on the system. Check the sight glass in the receiver if the refrigerant level is sufficient.

6) The connection to the FI has been interrupted and a restart attempt will be done. The alarm 500 FI missing will be in-active in this period. Check the communication cable to the FI and the FI.

7) The expansion valve is closed and the To limiter prevents a start. Check that the evaporator temperature is ok. Check if the expansion valve is operating properly.

8) The condensing unit is the coldest place in the system and at low ambient temperatures the refrigerant may stay in the unit and an opening of the expansion valve does not lead to at change in the suction pressure. Check that the winter start function is enabled in suction pressure mode.

9) The oil level is too low. Activate the oil return function. The compressor is running long periods at speeds below power frequency (50 Hz/ 60Hz) and as a result the oil stays in the evaporator due gas speed below the designed criteria. Activate the oil return function.

10) A control sensor has a malfunction. Check that the control sensor is valid. Suction pressure transmitter in suction pressure control mode and coldstore temperature sensor in room temperature control mode.

11) Only one compressor in dual compressor mode is used. The load is too low to start the other compressor and the load levelling has not yet reached the level of switching over to use the other compressor. Check also possible alarms for the compressor as there are no restart attempts due to the missing distinction between low oil level and compressor overheat.


To the top

Q: Why is the failure code 'Requesting data' active? >  Communication between display and controller faulty or interrupted. Check cable and connector LMC340i:CN7/1/4/5/6 <-> LUP200. Controller LED must be blinking


Q: Why has the high pressure switch cut out? (Failure code C600)  Check if the the condenser fans are blocked. Check the condenser. Is the operating point within the application limits?


Q: Why has the compressor overheat device cut out? (Failure code C601) Compressor overheat protection device has cut out or relay module LOM301 is defect. Check signal voltage (230VAC) 



Q: Why is the oil level too low? (Failure code C602) Check oil level. Check and protect oil return. Check oil level detector circuit.



Q: Why are fan 1 or fan 2 or both overheated? (Failure code W603/W604/W605) Check if fans are blocked. Check cables and fan thermostat. Replace fan if necessary.


Q: Why is the external setpoint adjustment beyond allowed limits? (Failure code W606) Check cables, signal and power supply. Check potential levels.



Q: A sensor, transmitter or a cable belonging to it is damaged (Failure code C607)
Search alarm messages for failure and eliminate cause. Switch of main switch and restart after 2 minuttes. 



Q: Why is the Tdis limiter repeatedly activated? (Failure code C608)
 Check if the fans are operating ok.


To the top

Q: Why is the Tc, condenser temperature limiter repeatedly activated? (Failure code C609)
 Check if the condenser is blocked/dirty. 



Q: Why is the FI current limiter repeatedly activated? (Failure code C609) Interrupt supply voltage to FI. Wait 10 minuttes and restart. Replace FI or compressor if necessary.



Q: Why is to, suction temperature repeatedly activated? (Failure code C611) The capacity of the compressor is too high or too smallexpansion valves. 


Q: Whys is the dual pressure switch active (Failure code C620) High or low pressure fault. Check fans and expansion valves. Unit restarts when signal is valid again.


Q: Compressor 1 failure (dual compressor mode) (Failure code C621) Check temperature and oil level. Safety chain for compressor 1 is faulty.



Q: Compressor 2 failure  (dual compressor mode) (Failure code C622) Check temperature and oil level. Safety chain for compressor 2 is faulty.

To the top

Q: Why is the heat pump not working? (Failure code C623) HP faults. Too many successive high pressure fault. Unit stops.


Q: Why is there liquids in the suction line? (Failure code W624 active) Check injection regulators on the evaporator. Check the defrost interval.


 

Q: Why is there liquids in suction line? (Failure code C625) Check injection regulators on the evaporator. Check the defrost interval.


Q: Why is there liquids in the discharge line? (Failure code W626 and C627) Check injection regulations on the evaporator. Check the defrost interval.


 

Q: Multible liquid in discharge line (Failure code C628) Check injection regulators on the evaporators or adjust settings for detection of multible times liquid in the discharge line.


Q: Multible liquid in suction line (Failure code C629) Check injection regulators on the evaporators or adjust settings for detection of multible times liquid in the suction line. 


To the top