User manual DOMETIC L-2176

[. . . ] 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. [. . . ] Only 0 - 652 PSI pressure transducer can be used. See below on how to select the type of refrigerant gas being used on each chiller 17 Tempered Water Logic Control Operation & Troubleshooting Manual For MPE-VXC Control Panel Some Important Notes To select the type of refrigerant gas used on a chiller unit ­ connect the display keypad to the chiller board that is controlling the chiller unit that is being affected. Under Main menu, scroll down to line item "Refrigerant Gas", press Enter to advance to the Refrigerant Gas menu, then you can select the type of refrigerant gas being used on that chiller unit. The default refrigerant gas type is R22, R407C, and R417. 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. In Heat mode, subtract the common loop water return temperature from the loop water out temperature. If the difference is 18 °F or more for 1 minutes and the common loop water return temperature is above 90 °F, then the chiller that has the fault will go to a sustained shutdown and display (Exceeded Loop Water Temp Diff Max Limit) and indicate which chiller. inlet and outlet sea water maximum temperature differential limit In the cool mode the system compares difference between the common inlet and sea water temperatures and generates a fault due to a wide temperature difference. If the common outlet sea water temperature is higher than the common inlet sea water temperature by more than 16 °F (8. 9 °C) and less than 20 °F (11 °C) for 5 minutes, or more than 20 °F (11 °C) for 2 minutes, the chiller will go to a sustained shutdown and the fault message will be (SeaWtr TD Max Limit), and all chillers are disabled. 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. [. . . ] Make sure the loop water return sensor is secured to the loop water return piping 1. Check for proper sea water flow, and make sure strainers are not clogged 2. Check the chiller unit's sea water headers and the condensor for debri build up 1. loop water temperature difference between common inlet and outlet of the chiller system is too much 1. [. . . ]