User manual DOMETIC L-2197 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. [. . . ] 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. Chiller unit in lock-out mode ­ Under Chiller On/Off menu, if the item line displays "call for service", which indicates the chiller unit is in a lock-out mode, and it cannot be enabled. Only authorized dealer and factory personnel can unlock the chiller unit. Three consecutive sustained shutdowns on a chiller unit within 48 hours will cause it to go to a lock-out mode. Chiller Board Outputs Each chiller board contains 6 outputs to control external devices such as compressor relay, loop water pump contactor, sea water pump contactor, immersion heater contactor, fault alarm relay, and reversing valve The following outputs are: Compressor - activates the compressor contactor or relay Reversing valve - activates the reversing valve coil Loop water pump - activates the loop water pump contactor; on single chiller panels systems, it will activate a loop water pump trigger Sea water pump - activates the sea water pump contactor; on single chiller panels systems, it will activate a sea water pump trigger 18 Tempered Water Logic Control Operation & Troubleshooting Manual For MPE-XC Control Panel Immersion heater ­ activates the immersion heater contactor Fault ­ activates a relay that can drive any alarm indicator Temperature Sensors Loop water return sensor - senses loop water return temperature; on multiple chiller units systems, the system monitors the loop water return sensor that is connected to chiller 1 at default. If this sensor fails, it will monitor the next available chiller's loop water return sensor. If all the loop water return sensors failed it will use the system's common loop water supply sensor to monitor stage set points. 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. [. . . ] 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. 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. [. . . ]