User manual DOMETIC L-2175

[. . . ] Follow the steps below to initialize the boards. EPROM chip replacement On multiple chiller units systems with more than one chiller boards networked together, if an EPROM chip is being replaced on any chiller boards, you will need to initialize the boards again after the new EPROM is inserted on the board. Follow the same steps above to initialize the boards. Notice that the software version number should be written on the EPROM chip. [. . . ] If R410A is used on that chiller unit, you will need to select R410A. You will have to repeat the above process for each chiller unit / chiller board. To calibrate the control AC voltage on a chiller board - connect the display keypad to the chiller board that is being affected, then measure the input power voltage feeding the chiller board. Under Main menu, scroll down to line item "Parameter Setting", press Enter to advance to the Parameter Setting menu. On the first line item "VAC Calibrate", press Enter and use the Up and Down buttons to change the value to be the same as the measured input power voltage value. You will have to repeat the above process for each chiller board. To disable a chiller ­ go to the Chiller On/Off menu and scroll down to the chiller you want to disable and push Enter, to enable it again push Enter again. A disabled chiller is indicated on the system screen as D#. To clear a system fault ­ push Enter to clear a fault and it will automatically jump back to the Default screen Sustained shutdown on a chiller ­ a chiller will go to a sustained shutdown due to exceeding a limited amount of the same consecutive faults or due to a particular fault, and the chiller will be disabled also. The system screen will indicate this by displaying F# (the second character indicates which chiller number). To enable the chiller to turn back on go to the Chiller On/Off menu and scroll down to the chiller you want to enable and push Enter. You will need to go to the Chiller On/Off menu to enable all the chillers to make them run. Temperature Sensor Faults The chiller system monitors for defective temperature sensors that are opened, shorted, or sensing a temperature that is out of range. common loop water return sensor - if this sensor is defective, the keypad will display a fault message, and also the fault light and the beeper should turn on. Immediately, the system will monitor the next available common loop return sensor. If all the common return sensors failed, then it will monitor the common loop supply sensor and use it to monitor loop water temperature set points. This way the system does not need to go to a sustained shutdown and keeps running. So, the system would use the common loop supply sensor for monitoring and controlling the loop water temperature. The chillers would still turn on and off according to the stage set points. The user will 20 Tempered Water Logic Control Operation & Troubleshooting Manual For MPE-XC Control Panel have to acknowledge and reset the fault in order to turn the fault light and the beeper off. If the common loop supply sensor is also defective, then the system should display the sensor faults. common loop water supply sensor - if this sensor is defective, the keypad will display a fault message, and also the fault light and the beeper should turn on. [. . . ] Mak e s ur e the l oop wate r re tur n s ens or i s s ec ur ed to the lo op water return pi pin g 1. Check for proper sea water flow, and make sure strainers are not clogged 2. Chec k the c hil le r uni t's s ea wa ter he ader s an d the c onde ns or for de br i build up 1. loop water temperature difference between common inlet and outlet of the chiller system is too much 1. [. . . ]