The relay plays the role of indirect protection equipment, compressor normal suction pressure is generally 0.4 ~ 0. If the wire to end goes UP the pump is spinning CW and if DOWN CCW. For more information CLICK HERE. . What problems can be caused by low-pressure failure of a chiller? The chiller therefor turns off to protect itself from damage. This is because most components around a chiller panel are usually AC. Blocked condenser coil. Make sure your pump is turning in the correct direction. A micro reset can be achieved in two ways. Even when your chiller is inspected and maintained regularly, its performance can degrade or deteriorate over time. If that does not work, turn main supply power to the chiller OFF for one minute and then back on. Light load conditions. On large air cooled chillers, the panel is quite big to control all of … If it is too small, the pressure of the condenser in front will be too high. If there is any excess wire shielding on the gray transducer cables showing, tape the area with black electrical tape. The possible causes for this alarm could cause compressor and evaporator failures, and should be investigated as soon as the alarm is detected. What Is Glycol Chiller And Why Glycol Is Used For Cooling. 7. a high or low pressure or temperature. First, by pressing the power button for 2-3 seconds. The chiller consists of four main components: compressor, evaporator, condenser and expansion valve, thus achieving the cooling and heating effect of the unit. Problem: SYS # HIGH DSCH displayed (High discharge pressure trip) Possible Cause: Poor airfl ow through condenser coils. 2MPa, it will lead to low-pressure protection relay action, the chiller will stop running. Chiller Problems - Microprocessor Low Pressure error, Laser Chillers – Medical, Military and Custom. Make sure your LP micro trip point is set at 54 PSI. Your email information will be kept strictly confidential with us. Check oil pump and power supply. is near the minimum or below the minimum allowed in the IOM, it may be causing the low suction pressure fault. Current fault query, historical fault query, antifreeze protection device, high-precision high and low pressure controller, high and low pressure gauge. Make a mark on the gauge where the pressure is when the chiller is in good working order. First, by pressing the power button for 2-3 seconds. The most common cause for low water system pressure is a blocked strainer. More importantly, injury and even death can occur. Is the refrigeration system low on charge? If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to … On PACT and EST systems with integrated water storage tanks a common problem is a plugged strainer located just above the tank recirculation pump discharge. Solution: Properly increase the opening of the expansion valve. In extreme cases, evaporator freeze-up can cause catastrophic system failures; for example, a ruptured evaporator can not only ruin your entire chiller … FREEZE, FLOW, OR LOW PRESSURE ALARM Sometime during the life of your chiller system you may encounter a freeze alarm. And sometimes the low-pressure relay will work out of order due to moisture, broken circuits, and other faults. If both pressures are low, a leak inspection may be advisable. Blow though with compressed air or nitrogen, jet wash etc. When your wire tie makes contact with the plastic cooling fan the end will be forced up or down depending on the direction of spin. Make sure your SP micro setting is no lower than 45F. You can use this mark to notice if the pressure is starting to drop off. High pressure fault of chiller. So amazing ,detailed, brief but with adequate content am loving this, Your email address will not be published. Check for damaged fi ns/return bends. You pump MUST be spinning the same direction. Check oil level. Celsius), which will trigger the chiller alarm.The following causes are possible. Relay failure, Electrical System False Alarm, Industrial Chiller Low Pressure Alarm Troubleshooting. Suction pressure low - Low superheat at evaporator outlet. LOSS. Before holiday my operator have check lubrication oil level always on operation range. Compressor oversized and the evaporator is undersized. Low Pressure Fault on a Carrier Chiller ACES have a team of highly experienced engineers based in London 24/7. SUMMARY This article describes how to fix a chiller system that, after startup, has a stopped compressor and a low pressure error. This article is... High pressure faults. Evaporator coil is icing. 2. Located at the end of the pump there is an arrow embossed into the SS head of the pump. 143->Line Phase Loss P ower loss has been detected in any phase. 5. Coils On all chiller models, the factory recommends a filter or strainer on the FROM PROCESS loop line to prevent debris from entering the chiller. Before processing with any other steps, turn the power to the chiller off and clean the strainer. Pumps can fail, process lines can clog, refrigerant can leak, and any number of problems associated with component aging or changing environmental conditions can occur (table 1). I have experienced a low pressure fault 2 times in the last 2 weeks. A ball park for design high side pressure is ambient +30 converted to PSIG. RESOLUTION ********* Important Update ******** On 12-31-15, PSG Controls (makers of chiller controls from 2000 to 2012 for both Legacy and Drake brand chillers) went out of business. Number 16 pressure probes 4-20 mA 0-30 bar. The micro will then display the above faults and lock out the chillers cooling system(s). What cuase a low pressure evap alarm on air cool chiller - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. 851 Tech Drive Telford, PA 18969 Email: support@legacychillers.com Toll-Free: 877.988.5464. The first fault I had showed at the time of the fault my discharge and suction were equalized and that my oil pressure was at 5 psid indicating to me that at the time of the fault the compressor was off. What are the causes of low pressure in chillers? G. Proof of flow — either flow or pressure switches in water circuit are suffering from low or no flow, blocked water filter, water valve shut off, water piping too small, flow switch paddle broken (very common). Individuals who lack such experience can cause damage to this equipment that would not be covered under warranty. The high-pressure fault of the chiller means that the compressor exhaust pressure is too high, which causes the high-pressure protection relay to operate. Dirty coils causing high head pressure on a carrier chiller. Ambient temperature too low – The ambient temperature could be below the programmed operating temperature. 6. The above is the disposal method of the high-pressure fault of the air-cooled chiller, If you want to get more information about good quality chiller… I can almost guarantee, that sometime during the life of your chiller system you will experience a Freeze Alarm. Check oil filter. We have started use it 7 months ago. Note: A PDF version of a TP chart for most common refrigerants has been linked to this article below. AC Chiller Fault Finding & Diagnosis. When there are too many impurities, the filter will be clogged, the refrigerant passage and return air will be reduced, and a low-pressure fault will occur. Check for partially or closed shut-off valves. are AC too. Poor distribution of refrigerant thru the evaporator nozzle and circuits. Insufficient refrigerant will lead to pressure malfunction in the system, resulting in lower suction pressure. Too small an expansion valve opening will allow less refrigerant vapor to pass through. Action: Check for airfl ow restrictions caused by blockages on intake faces of air coils. Required fields are marked *. Generally there are above-mentioned reasons for water chiller low pressure faults. Component failure. 143 AUTORESTART. Industrial Chiller High Pressure Alarm Troubleshooting. © 2021 Legacy Chillers, Inc. All Rights Reserved. This may be caused by refrigerant leakage, clogging of the condenser tubing, under-charging of the refrigerant system, or low ambient temperatures. E.g. After the compressor is turned on, the control has a 15 second buffer for the low pressure fault. If at any time during a run cycle the micro sees low-side pressure below the LP set point for more than 90 seconds, the micro will lock out the chillers compressor until the micro is reset. We have experts waiting to take your call After power up and compressor start, compressor stops before reaching the SP1 or SP2 set point and the micro processor indicated a �Lo 1� or “Lo 2” in the top screen, the trip pressure in the bottom screen and the low pressure indicator light on the micro is lit. The most often used function on our multi meters is AC. If it is blocked, make a note of how … On Single-phase chillers, if your pump is running the wrong direction, please call the factory for further instruction. Too warm: The flow to the camera’s is too low. Example: An R-22 system at 60F ambient 50F chiller leaving temperature will run a high side pressure of about 175 PSI and a low side pressure of about 60 PSI. According to the system fault phenomenon, step-by-step investigation is helpful to quickly find the cause of the fault and resume normal production as soon as possible. Check for foaming oil at start-up. On THREE PHASE systems only, if your pump is spinning the wrong direction, STOP turn the main power OFF to the chiller and reverse any two legs of power on the main buss. This arrow will indicate the design rotation. If the reading isn’t comparable, the sensor will … Water Chiller Faults Water Chiller faults and diagnostics.. Common faults, High pressure, Low pressure and component faults. Low pressure faults. Make sure … Strainer. Usually the bottom rows of the evaporator will freeze up when this occurs. The chiller will sound a low-pressure alarm and the unit will stop. When there is a low-pressure failure of the chiller, you can contact the manufacturer for assistance. Check transducer wiring and accuracy. Measured pressure is incorrect. Check the following items BEFORE resetting from a Low Pressure trip: 1. Check Oil Filter. I don’t why is cause my chiller … If the chiller is started at this time, a low-pressure fault alarm will be issued. If 1-7 above does not solve the low-pressure trip issue it is recommended that you call the factory for further support at 877-988-5464. Legacy Chillers, Inc., manufactures of process chillers for industrial and commercial fluid cooling applications. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Cause. My company have 3 chiller Mcquay WSC100MAZ71F. Our chillers are specially engineered with components designed for mission critical cooling applications and 24/7/365 service duty. The normal value should be 1.4 ~ 1.8MPa, and the protection value setting is recommended not to exceed 2.0MPa. How to solve it? The chiller reports a low-voltage fault Refrigerant leaking from the system (check the low pressure gauge first, check if there is any pressure, if there is no pressure or the pressure is low, it means the leaking snow) Solution: Check for leaks and make up for leaks, check each copper pipe connection to see which location is leaking A chiller warning message can have the following causes: A): The water level in the chiller is too low. Turn power back on and recheck rotation. Problem: Chiller FAULT: LOW AMBIENT TEMP displayed. These valves are shipped in the closed position from the factory. Check the following items BEFORE resetting from a Low Pressure trip: 1. Running a single system on the chiller and checking the temperature differential across the evaporator (return minus leaving water temp) is also a quick means for checking for low flow, if the flow cannot be measured using a flow Low pressure is normally caused by a broken power assembly capillary, insufficient water flow, mud coating on the tubes, a blocked water filter, or low refrigerant. PENDING. It is inevitable that impurities will seep into the system when the chiller is assembled, and after using it for a long time, various impurities will also enter the system. SYMPTOMS Low pressure (Lo1 or lo2) error message on microprocessor controller. Regular preventative maintenance and knowing what to look for when the performance of your chiller deteriorates During Tet holiday i have stopped provide power for 3 sets. A quick why to determine a low charge is to install a manifold gauge set on the high and low side of the refrigeration system. After holiday my company re-production I have run chiller machine. Low-pressure trips should not happen provided the system is started up properly therefore further investigation is unusually needed. The compressor discharge pressure reflects the condensing pressure. MORE INFORMATION Recommendations in this article should be preformed by QUALIFED service personnel who have extensive experience with high voltage/control electrical and plumbing systems. As of 1-1-2013, Legacy Chiller Systems has developed a retrofit package for the PSG process chiller control system. Low-pressure trips should not happen provided the system is started up properly therefore further investigation is unusually needed. Factory Address: 851 Tech Drive Telford, PA 18969. Page 35 CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons Low Pressure Fault. You can check for pump direction by CAREFULLY sliding a nylon wire tie through the air vent at the end of the pump housing. After resetting the chiller and compressor starts, carefully watch your gauges. Expert specializing in industrial chiller machines for more than 10 years, good at water cooling solutions in the energy, aerospace, automotive, electronics, manufacture processing, medical industries etc. The chiller can also encounter a high-pressure issue if the water-cooled condenser has a buildup of minerals that affects the water quality, or if the condenser has little or no flow. Solution: If the cooling water temperature is too low, close the cooling tower fan or throttle the cooling water to … If your chiller is equipped with a flooded condenser option, make sure both liquid refrigerant king valves entering and leaving the receiver are fully back seated � OPEN. I'm fairly new to the forum so I am reaching out to anyone with centrifugal experience. When the outside temperature is low, the cooling water and compressor oil temperature will also be relatively low. Make sure ALL wire connections on the back of the microprocessor are tight. This refers to the chiller turning off by itself, through the internal controls, due to a detected fault or if it has reached the limits of a design setpoint. Too little refrigeration steam will make the compressor inlet pressure low, resulting in a low-pressure fault. *4. But the strategy to increase lift (head pressure) to maintain chiller stability sacrifices chiller efficiency in situations where low-lift conditions would be available to slash operating costs. 6MPa, when the suction pressure is lower than 0. If that does not work, turn main supply power to the chiller OFF for one minute and then back on. Make sure that NO stray wires from the micro are touching the case or any other wire connection on the back of the micro. These alarms can not … LINE PHASE. A tech will compare the temperature reading on the display to a thermometer reading at the sensor. After troubleshooting, the problem can be solved by charging the right amount of refrigerant. Low Differential Refrigerant Pressure - Circuit 1: 1AF: Low Differential Refrigerant Pressure - Circuit 2: 583: Low Evaporator Liquid Level - Circuit 1: 5B6: Low Evaporator Liquid Level - Circuit 2: 194: Low Evaporator Refrigerant Temperature - Circuit 1: 195: Low Evaporator Refrigerant Temperature - Circuit 2: 6B3: Low Evaporator Temp – Ckt 1: Unit Off: 6B3 SCY Chiller is a professional manufacturer of industrial chiller, air-cooled chiller, water-cooled chiller, glycol chiller from China. Chillers and Radiology – What’s the Buzz. Current fault query, historical fault query, antifreeze protection device, high-precision high and low pressure controller, high and low pressure gauge. Low refrigerant pressure Shuts down the chiller and requires manual reset e) Low water flow through evaporator Shuts down the chiller and automatically resets when flow is restored FREEZE, FLOW, OR LOW PRESSURE ALARM . Broken ambient sensor – Have an authorized technician check if the ambient sensor is broken. A micro reset can be achieved in two ways. Expansion Valve Opening Too Small or Damaged, 5. A ball park for design low side pressure is chiller leaving fluid temp � 5F converted to PSIG. If you have an ES,PAC system such filters and strainers must be cleaned, as they WILL cause low flow errors. Excessive refrigerant charge. If the compressor is running at low pressure, the motor load will become smaller and a chiller with a low-pressure fault will waste power for nothing under the same cooling conditions. Because the long-term pressure is too high, it will cause the … Low Discharge Pressure Alarm The refrigerant discharge pressure is too low. With the chiller off and the water system valves closed, unscrew it and check for debris. * If your process requirements require settings lower that above, glycol freeze protection must be used to prevent Lo 1 trips and provide freeze protection. The part of refrigerant leakage can be diagnosed from the piping connection of accessories such as compressor, condenser, filter, expansion valve and evaporator. Expansion valve is a refrigeration system throttling device. If the chiller is started at this time, a low-pressure fault alarm will be issued. Page 9: Pressure Probes TECHNICAL MANUAL CVM 3000 C 5030 CV/04-99 GB Pressure probes The 16 4-2 mA type pressure transducers have a different meaning depending on the software configuration given to the machine’s configuration parameters. 4. CHECK OIL FILTER 142->Low Oil Pressure Alert. It is usually a ‘Y’ type with a bolted fitting. If the chiller suction pressure is low and the return air volume is reduced, the cooling capacity can not reach the target. Clean ALL filters and strainers: Restrictions to flow through the chillers cooling system WILL cause Lo 1 trips. The safety chain including the low pressure, high pressure and flow switches are usually fed by a 230v supply. Keep in mind that these are common, but certainly not all the problems that can cause a chiller … The 415v line volts to fans, pumps compressors etc. *3. B): The water temperature of the chiller is above or below the setpoint (usually 20 deg. Your email address will not be published. As a result, replacement parts for this process chiller control system are expected to run out in 2016. Page 10: Low Voltage Digital Inputs CAUSE Upon compressor start, the micro processes monitors the Suction or Low-Side pressure of the refrigeration system. Chiller Fault: Low Ambient Temperature. all of it has fault as ” COMPR STOP – Oil detal pressure low # 1″. 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