User manual DOMETIC TEMPERED WATER LOGIC CONTROL FOR MPE-XC

[. . . ] Tempered Water Logic Control English OPERATION l TROUBLE SHOOTING For MPE-XC Control Panel TEMPERED WATER SYSTEMS Rev. 20080223 L-2197 Tempered Water Logic Control Operation & Troubleshooting Manual For MPE-XC Control Panel *** IMPORTANT NOTICE *** Chiller board replacement On multiple chiller units systems with more than one chiller boards networked together, if a defective board is replaced by a new board, you will need to know if the new chiller board is compatible with the other chiller boards. Read the instruction sheet that comes with the replacement board to determine if your board is compatible with the others. Also, you will need to initialize the boards again after the new board is connected to the system. [. . . ] Loop water out sensor - senses loop water out temperature Common loop water supply sensor - senses common loop water supply temperature; this sensor is hooked up to chiller 1; additional common loop water supply sensor can be added to the system, which is limited by the amount of chiller boards; the system monitors the common loop water supply sensor that is connected to chiller 1 at default, if this sensor fails, it will monitor the next available common loop water supply sensor Common immersion heater loop water sensor - senses common immersion heater loop water temperature; this sensor is hooked up to chiller 1; additional common immersion heater loop water sensor can be added to the system, which is limited by the amount of chiller boards; the system monitors the common immersion heater loop water sensor that is connected to chiller 1 at default, if this sensor fails, it will monitor the next available common immersion heater loop water sensor Flow switch - monitors loop water flow High pressure switch - monitors the compressor's discharge pressure; it can be replaced with a 0-652 psi pressure transducer Low pressure switch - monitors the compressor's suction pressure; it can be replaced with a 0-652 psi pressure transducer Additional Sensors Additional sensors can be added to the system, such as: Compressor current transducer, sea water pump current transducer, loop water pump current transducer, sea water out temperature sensor, common sea water in temperature sensor, loop water pressure transducer, and sea water pressure transducer Chiller System Monitors for the Following Faults flow switch ­ when opens for more than 2 seconds, it generates a fault. After 5 consecutive flow switch faults, the chiller will go to a sustained shutdown loop water out low limit ­ when the loop water out reaches 37 °F (2. 77 °C) or below, it generates a fault. After 3 consecutive loop water out low limit faults, the chiller will go to a sustained shutdown loop water out high limit ­ when the loop water out reaches 130 °F (54. 4 °C) or above, it generates a fault. After 3 consecutive loop water out high limit faults, the chiller will go to a sustained shutdown 19 Tempered Water Logic Control Operation & Troubleshooting Manual For MPE-XC Control Panel sea water out low limit ­ when the sea water out reaches 38 °F (3. 33 °C) or below, it generates a fault. After 3 consecutive sea water out low limit faults, the chiller will go to a sustained shutdown immersion heater loop high limit ­ when the immersion heater loop water reaches 150 °F (65. 5 °C) or above, it generates a fault. After 3 consecutive immersion heater loop water high limit faults, the chiller will go to a sustained shutdown high pressure ­ generates a fault as soon as high (discharge) pressure switch opens or exceeded 426 PSI, if R22, R417, or R407C is selected as the refrigerant gas type. If R410A is selected as the refrigerant gas type, then the high pressure fault would occur at 574 PSI. After 3 consecutive high pressure faults, the chiller will go to a sustained shutdown low pressure ­ in the cool mode, if low (suction) pressure switch opens or drops below 30 PSI (if R22, R417, or R407C is selected as the refrigerant gas type) or below 60 PSI (if R410A is selected as the refrigerant gas type) for more than 1 minute, it generates a fault. In the heat mode, if the suction pressure switch opens or drops below the PSI value stated above for more than 5 minutes, then it generates a fault. After 3 consecutive high pressure faults, the chiller will go to a sustained shutdown. system network - if the system has a network problem, it will display a fault message (Loss of Network), each chiller unit still continue to operate independently. inlet and outlet loop water maximum temperature differential limit In the Cool mode, subtract the loop water out temperature from the common loop water return temperature to obtain the difference. If the difference is 15 °F (-9. 44 °C) or more for 2 minutes and the common loop water return temperature is between 65 °F (18. 33 °C) or less, 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. 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. [. . . ] Check for proper loop water flow, and make sure strainers are not clogged 1. Sensor is opened, shorted, or sensing a temperature that is out of range 1. Check sensor wires for shorts and opens and compare temperature reading with a digital thermometer 1. Sensor is opened, shorted, or sensing a temperature that is out of range 1. [. . . ]