Ultimate Chiller Troubleshooting Guide: Fix Common Issues Fast

Your chiller’s out of whack, isn’t it? Few things will crush your operation faster than a cooling system that’s just gone on what seems to be a permanent vacation. We’re talking lost productivity, unplanned costs, and a whole bunch of headaches. But here’s the thing: most of the trouble-shooting that comes our way doesn’t require some mysterious beast be slain. They are often predictable, and with the right intel, you can both diagnose, repair and even prevent a boatload of hurt.

Chillers are essential for meeting those temperature targets in industrial settings, and they gobble up quite a bit of energy. So, the trick to getting them running right and keeping them that way? That’s your path to peak performance, a longer life for your gear and slashing those energy bills. This is not just about picking up whatever is broken; it is about understanding the whole game.

Why Do Chillers Even Act Up? Common Culprits

Consider your chiller as a high-performance athlete. If you don’t feed it properly, if you don’t train it properly, if you don’t recover it properly, it’s gonna break down. Most common causes If your chiller is down, it is most likely caused by one of a few key culprits:

1. Improper Operation

Listen: Every chiller has a manual, no? It’s not just kindling. It has the manufacturer’s playbook for operating the thing the way it should be run. Ignore it at your peril. Poor operating habits not only ding your chiller’s efficiency; they shave years off its life. Your system may grate by for a while, but take it from me, you’re priming yourself to be saddled with much greater, uglier and far larger headaches in the future. The play here? Train everyone on the proper way to maintain and operate a chiller. Small investment for a huge payout.

2. Maintenance Neglect

This is a big one. Skipping proper maintenance? That’s akin to driving your car without the oil changes. Not just a straight shot to underwhelming performance, but an energy bill capable of bringing a tear to the eye. You’ve got to stay on top of it: Regular inspections, monitoring those operating logs for diagnostics, and making sure the preventive and corrective maintenance gets done like clockwork. It is not an option; it is a necessity.

3. Incorrect Sizing

Tried to force a square peg into a round hole before? It’s what happens when a chiller isn’t sized properly.

• Undersized chillers? They’re fighting a losing battle and the worst in the equation will win the fight, which will result in proving that they are trying to cool more than they can do. The end result of this is insufficient cooling, poor airflow, and systems that aren’t very efficient. It’s a bit like trying to cool a mansion with a window AC unit.
• Oversized chillers? You may think “more power is better,” but these units don’t perform well at low load, so they’re burning more energy than they should. That’s a blow to your pocketbook.

The solution? Verify that your chiller’s cooling capacity corresponds in lockstep with your processing needs.

Your Chiller’s SOS Calls: Common Problems & How To Fix Them

Even the most attentive care can’t protect all chillers from going downhill after many years in use. Having a few troubleshoot techniques in your back pocket can prevent problems from becoming full-fledged disasters.

Now here are some of those popular calls and how to deal with them.

Chiller Won’t Start

This is a classic. You flicked on the switch, and … crickets. Before you start to panic, try these basics:

Common Causes:

• Loose Wiring: Connections work loose through vibration over the years, severing the juice.
• Blown Fuse or Tripped Circuit Breaker: Congratulations, your electrical system safety device is working. These can be tripped and shut everything down by an overload.
• Power Switch Off: Stupid, but sometimes it’s off, or not really turned back on after you worked on it.
• Control System Problems: Bad relays, unreliable sensors, or a rogue PLC can prevent startup.
• Insufficient Refrigerant Pressure: If the system has low pressure, safety controls will not allow the system to start.
• Active Compressor Overload: The compressor overload tripped and it will not start.
• Bad Thermostat: In particular when it’s really cold a broken thermostat can be the cause for it to not start.
• Incorrect Line Voltage or Bad Connection: If the voltage is off kilter (Not within 10% of rating) or you have a bad connection will kill one.
• Wrong Phase Connection: That’s definitely a big No! for 3-phase units.

Do this (Troubleshooting Action):

• Examine Electrical Connections: Make sure no wires are loose and tighten those that are.
• Fuses and Breakers: Test any blown fuses or tripped breakers and replace or reset it.
• Power Switch: Ensure that it is in the “on” position.
• Parking Ticket: Check control panel. Newer chillers have great ways of letting you know what’s wrong by specific error codes.
• Refrigerant Pressure: Verify pressure levels are where they should be.

If it’s still playing dead, you are going to need a technician to do a deeper dive into the electrical and mechanical intestines.

Lack or Absence of Cooling

Okay, so your chiller is running, but it’s not cooling the way it should, or at all. This reeks of poor temperature control or lack of eficiency.

Common Causes:

• Evaporator Icing: An overload of moisture or insufficient refrigerant can freeze over the evaporator, inhibiting heat exchange. The unit constantly runs, you are receiving warm air from the registers, and you can also have ice or frost on the indoor unit.
• Impure Coolant Fluid: If coolant has lost its magic (either because it is timestamped, or because it has become grotty) it cannot absorb heat as regularly.
• Dirty or Blocked Condenser: Dirt or debris may restrict airflow or water flow, reducing the amount of cooling.
• Wrong Setpoints: Your temperatures could be wrong, these could ask not match what your process is calling for.
• Refrigerant Leak: Low amounts of refrigerant cause the air conditioning system to struggle to absorb sufficient heat, resulting in colder than normal coils which can result in freezing.
• High Ambiance Temperature: Also, if the external temperature is extremely high, it can make cooling difficult.

Your Move:

• Inspect Outlet Temperature: Hold it against your setpoint. Is it even close?.
• Evaporator Check: Seek out that ice. If it’s there, let it thaw. Don’t ever chip the ice off — you’ll damage the coil.
• Coolant Fluid: If it is compromised, then change it out with new, manufacturer recommended coolant.
• Condenser Cleanliness: Clean your coils. For the water-cool units of course, make sure that the water is running through.
• Fine-tune Setpoints: Tweak the temperature controls to your operating requirements.

If the system is still not chilling adequately, a complete system inspection is probably in order.

Lack of Pump / Bad Flow Of Coolant

If coolant is not circulating properly through your system, it might as well be dead in the water. This screws with the entire refrigeration cycle and cuts efficiency. Water flow is everything; if it’s too low — let’s say you’re below 15 — cooling efficacy plummets, and some chillers will even throw a warning.

Common Causes:

• Inadequate Coolant Quantity: Without the required coolant, there will be no circulation at all.
• Partly Open Valves: If a valve is not completely open, flow is restricted.
• Pump Failure: A faulty pump simply can’t circulate coolant.
• Process Line Restrictions: Pipes or heat exchangers plugged or choked down.
• Blocked Fluid Filter: A dirty or clogged filter reduces water flow; some chillers contain two filters to inspect.
• Air in Water Circulatory System: Air lock, underpower pump, low in-water inlet pressure, the air may like to get out the block.

Your Move:

• Coolant Reservoir: Inspect and add if necessary.
• Valves: Check and open all valves.
• Pump Check: If the pump is making an odd noise it is wearing out.
• Process Piping: Backwash to cleanse any obstructions.
• Purge Air: What I do is fill the tub to the top of the outlet port, turn on the chiller and keep adding water via a hose directly into the outlet port. This hose pressure assists in pushing air out, and you will see bubbles.

Still no flow? Now it was time to take a long look at the pump and piping.

Low Coolant Level

A low coolant level detection is obviously an indication – the liquid in your chiller has fallen out of the safety zone. This means bad heat transfer and a potential system failure if you don’t react quickly.

Common Causes:

• Evaporation: Duh — this is a given with open systems, especially.
• Leaks: Hoses, seals, fittings — scrutinize ‘em all for cracks or wear.
• Poor Upkeep: Simply neglecting to monitor and fill when required.
• Leak of refrigerant: This can also act as low voltage prblem.

Your Move:

• Leak Hunt: Check for visible leaks and repair or replace leaking parts.
• Hoses, Seals, Fittings: Look at them closely to see if they’re worn.
• Refill: Refill the coolant level with the prescribed amount of the right kind.
• Monitor: Watch readings for any persistent dips.

If you are still losing coolant, you may in fact have a hidden leak, and that means you need a pro.

Interpreting Chiller Alarms: What Are They Telling You?

Modern chillers are smart. They blink error codes and fault displays to let you know exactly what’s going on. Specifically, these codes are a gold mine for quick diagnosis. Let’s parse a few common alarms:

Alarm High Temperature / Over Temperature

The temperature of the process rising above your setpoint. This shouts “I’m trying too hard” or “something is getting in the way of my recovery.

Common Causes:

• Too Much Heat Load: You’re expecting the chiller to provide more cooling than it’s capable of.
• Limited Heat Dissipation: Its ability to shed heat is being choked by dirty condensers, weak airstream or low water flow.
• Wrong Temperature Setpoint: Perhaps your setpoint is too high for your application, resulting in a false alarm, or too low, working the system too hard.
• Refrigerant: Low refrigerant levels or leaks cause a lack of proper heat absorption.
• Mechanical Failures: These failures are likely to be with either the compressor, the fans, or the pumps.
• Limited Circulation of Coolant: Filters are blocked and there is a problem with the pump or the pipes which is preventing correct heat transfer.
• Bad Sensors or Settings: A malfunctioning sensor or improper temperature settings on a building management system can cause a false alarm.

Your Move:

• Cut Down on Heat Load: If you’re stressing it out too much, ease up.
• Clean cooling condensers: Unil ventilation and water ou) tflow are as close to their design as possible.
• Check Setpoints: Re-adjust setpoints if necessary.
• Refrigerant: Look for leaks and check level.
• Pumps and Fans: Make sure these are running.

When the alarm doesn’t stop, it’s time to call in the pros.

Low Temperature Alarms

This is the opposite: Your process temperature is under setpoint.

Common Causes:

• Not Enough Heat Load: The chiller is simply too large for what the process is producing.
• Incorrect SetPoint Settings: Perhaps your setpoint is a bit too low so the alarms are triggering without need.
• Incorrect Temperature Sensors: A sensor may be feeding false data to the system.
• Refrigerant Charge Over: Excessive refrigerant can result in overcooling.

Your Move:

• Turn It Up We’re talking heat or adjustments in process conditions.
• Calibrate and Set Setpoints: This will allow you to get them dialled.
• Examine/Calibrate Sensors: Ensure they are precise.
• Refrigerant Levels: Test, and correct if overcharged.

If you have a freeze, turn it off, allow it to thaw, then turn it on again.

High Discharge Pressure

This is due the pressure in the exhaust side of the compressor being high, possibly activating the high pressure protection relay. Normal ranges of vWF are between 1.4 and 1.8 MPa, and the protection ratio is less than 2.0 MPa. Prolonged high stress may also be a source of compressor damage due to excessive operating current.

Common Causes:

• Cuased by: Dirt Condenser Coils/Tubes: Twisting lowers heat transfer rate resulting in higher condensing pressure.
• Low Air/Water Flow Across Condenser: Condenser cannot reject heat properly.
• Hot Return Condenser Water: If your cooling is water cooled and your water is returning into the system too warm, your system will become less efficient at exchanging heat.
• Partially closed discharge shut off valve: This makes your pump work harder against restricted flow and pressure.
• High Ambient Temperature: Difficult for condenser to get rid of heat.
• Overcharging of Refrigerant: Excessive refrigerant raises the suction and the discharge pressure.
• Scale or Blockage on Condenser: Tap water can cause scaling while dust or foreign objects may clog the condenser, degrading heat exchange.
• Non-Condensables (Air, Nitrogen): These gases may enter the system through inadequate evacuation following service; they raise pressure.

Your Move:

• Clean Condenser: This one is big. provide optimal ventilation or water flow Revise provide optimal ventilation or water flow.
• Verify Refrigerant: If refrigerant is over charged, evacuate refrigerant until pressures return to normal.
• Discharge Air: If noncondensable gases are suspected, vacate and recharge. After shut down, you might want to try blowing down the air at the top of condenser.
• Water Pump Check: Make sure it is the right size and not too low gpm.
• Cleaning Filters: Clean the filters of alm -led pipes.

Low Pressure Alarms

This usually means things like low refrigerant or failing expansion valve. It’s consequences of being neglected are diminished cooling, higher energy usage, compressor wear, and in severe cases the evaporator produces ice.

Common Causes:

• Low Refrigerant Charge/Leak: Not enough refrigerant inside the system.
• Replace Expansion Valve: A malfunctioning or blocked valve will limit refrigerant movement.
• Dirty/Frozen/FouledEvaporator Coil: Restricts air flow & reduces cooling capacity, air velocity and pressure.
• Limited Refrigerant Flow: This can be caused by an obstruction such as a plugged filter drier.
• Low Ambient Temperatures: May decrease the rate of refrigerant evaporation, which causes low pressure.
• Bad Pressure Transducers or Sensors: These could be providing inaccurate readings.
• Compressor Problems: A compressor that is going bad will have difficulty in keeping the suction pressure where it needs to be.
• V-Partially Closed Suction Valve: Limits the suction to the compressor.

Your Move:

• Check Refrigerant Levels: Test for leaks with detectors or UV dye; examine the sight glass. When it leaks, repair and recharge.
• Check Expansion Valve: Verify that its functioning properly and it isn’t obstructed.
• Inspect Evaporator Coil: Check for ice buildup or dirt. Clean it and improve airflow.
• Refrigerant Circuit: Determine whether the filter drier is blocked, if there are kinks in the piping, or oil.
• Inspect Compressor Operation: Check pressures and listen for any unusual sounds.
• Confirm Sensor Readings: Compare with other gauges.

Deep Dive: When Individual Parts Go Rogue

In this instance, general troubleshooting points to something crying out for help. This is what some of those deeper issues look like:

Compressor Failure

The heart of your chiller. When the compressor dies, it’s typically because of mechanical reasons or electrical issues.

Mechanical Causes:

• Oil Dilution / No Oil: This results in excessive bearing wear, a galled scroll set. Possible causes are: (1) a horizontal or no vertical traps in the line set; (2) short cycling; (3) flooded starts; or (4) liquid flood back.
• Refrigerant Floodback: Refers to the entry of liquid refrigerant into the compressor while it is running. That can snap the scroll set – you can’t compress a fluid – and ruin contact parts through lack of lubrication.
• Flooded Starts: During the system’s off cycle, the vapor refrigerant will move to the coldest part of the system and condense in the compressor sump. Oil is sucked up into the scroll instead of gas at startup.
• Misaligned Parts: things were simply not lined up as they should have been.
• Overheating: This is a killer. It’s also horrible for the mechanical as well as electrical parts longevity of the goblet. Possible causes are high compression ratio, high return gas temperature,s high superheat, undercharge/loss of charge or scroll wrap.

Electrical Causes:

• Mis-Wire: Incorrect wiring.
• Bad Starting Components: Problems with the start capacitors, relays or any “external to the motor” features.
• Low: Voltage outside the 10% tolerance.
• Voltage Spike: Rapid increase in electric potential.
• Bad Contactor Contacts: Issues with the contactor which is in charge of sending power.

Consequences of Compressor Failure (Usually Burnt Windings): The common occurrence, as you might expect, is that the motor windings are burned. It usually consists of the following steps:

1. Bearing wear.
2. Rotor mis-alignment.
3. Rotor rubbing on stator.
4. Debris build-up on the motor.
5. Finally, electrical failure.

There’s a certain kind of motor burn that does tell a story:

• Burn Out: Whole windings burned, frequently because of voltage issue or no motor cooling.
• Spot Burn: A burn in a particular locati0n often caused by a voltage surge or the introduction of foreign material.
• Start Winding Burn: The only the start winding, blown, that could be a problem with the start components.
• Leads Shorted: Dead short in the motor leads.

For A Failed Compressor: The Hard Reset This is not a fast swap. You need to fix the causes of the breakdown, or you’re going to get another breakdown.

For Mechanical Failure:

• Recover refrigerant.
• Remove the old compressor from the system (DO NOT SWEAT IT OUT)
• ReInstall your new compressor and the start components.
• Install a new liquid line dryer.
• Test the pressure of the system for 30 minutes.
• Evacuate to 500 microns.
• Recharge with appropriate amount and kind of refrigerannt.
• Check the proper function by measuring the Superheat (SH) and SC (Sub cooling).
• CORRECT THE FUNDAMENTAL FLAW THAT CAUSED THE FAILURE!.

For Electrical Failure:

• Recover refrigerant to a dirty tank with residue, water and acid as it likely contain sludge, other contaminants.
• Remove the old compressor from the system.
• Fit the new compressor and starting kit.
• Fit a suction line drier (if required for acid extraction).
• Install a new liquid line filter drier.
• Pressure test for 30 minutes.
• Evacuate to 500 microns.
• Recharge with the correct quantity and type of refrigerant.
• Confirm normal operation with SH and SC.
• SOLVE THE ACTUAL CAUSE OF THE FAILURE!.
• VERY IMPORTANT Not cleaning the system correctly after an electrically burnt up compressor will cause another failure.

Frozen Evaporator Coil

This is a problem that happens a lot, but that has an obvious symptom: unit operates continuously, you’re getting warm air, ice or frost begins to develop, and you may even experience leaks of water. Frost is not the norm, by the way.

Causes:

• Poor Airflow: Insufficient air passing over the coil means refrigerant won’t boil and absorb heat like it should, and that allows the coil to freeze.
• Insufficient Refrigeration: No matter how long you can hand models for 90 second with 5 seconds of a clean setup, if the refrigerant charge is less than it needs, it can’t remove enough heat, and the coil will get too cold, causing frost or ice.
• Low Heat Load: Icing can happen when the weather isn’t too extreme, if the temperature is close to your setting, an issue with airflow, or a refrigerant problem is bad enough.

Diagnosis:

1. Thaw the Coil: Turn off the power to the system. You can also run the fan only and defrost faster. Do not chip ice – you will crack the coil! Just let it thaw naturally and make sure the drain pan is not blocked.

2. Measure Temperature Drop: Once it’s up and running again, check the difference between supply and return air.

• High temperature drop? You have an airflow problem.
• Low temperature drop? Likely a refrigerant problem.

Investigating Poor Airflow:

• Clogged air filter.
• Filter that’s too restrictive (such as some HEPA filters).
• Dirty coil: dirt acts as an insulator over the fins, impeding air flow.
• Blower motor or fan problems.
• Duct problems: holes, obstructions, or poor design.
• Closed registers.

Studying the Poor Cool:

• Refrigerant leaks: A leaking charge in the coil through holes or cracks.
• Metering device issues: If your refrigerant is improperly flowing into the evaporator, this metering device is on the fritz.

Water Leakage

Not good. Water where it does not belong is a problem.
Common Causes:

• Leakage from Pump: Typically, a bad or loose shaft seal.
• Leaking Water Tank -Possibly bad weld or just old.
• Bad Ball Valve: Shut off valves can go bad.
• Leak at floating ball position: This is another common leak area.

Unusual Noises

Your chiller does not need to sound like a washing machine on its last legs.

Common Causes:

• Loose parts.
• Fan and belt vibration.
• Broken bearings.
• Tube vibration.
• Refrigerant undercharge.

Low-Voltage

When that chiller of yours is running on electric fumes.

Common Causes:

• Refrigerant leaking.
• Broken pressure controller.
• Faulty control board.
• Blocked filter.

Compressor Constantly Working

If the compressor never shuts off, that’s a bad sign. It’s either inefficient or overburdened.

Common Causes:

• Insufficient chiller capacity (it’s too little for the job).
• Iced-up evaporator.
• Dirty condenser.
• Contaminated or restricted filter drier.
• High ambient temperature.
• Loose or not working expansion valve.

Frozen Suction Line

This occurs when too much refrigerant passes into places it shouldn’t.

Common Causes:

• The power too high, more refrigerant is left at the expansion valve.
• Faulty evaporator fan.
• Refrigerant overcharge.

Frozen or Sweaty Liquid Line The only thing worse than a frozen liquid line is a condensation-covered one.

Another indication of restrictions in refrigerant flow.

Common Causes:

• Blocked filter drier.
• Restricted or closed liquid line valve.
• Leaking solenoid valve.

Air / Non-condensible Gases in System

Your refrigerant system is a sealed system with refrigerant and oil. Anything else is bad news.

Causes:

• Vacuum wasn’t good enough: The system was not evacuated well enough.
• Vacuum leaks: Air pulls into the system.
• Evacuation incomplete during maintenance: The system didn’t remove all the air.

Results:

• Copper plating on components.
• Oxidation.
• Pitting of components.

Solutions:

• Evacuate the system properly once again.
• Replace the dryer filter.
• The condenser has a void of atmosphere at top.

Foreign Debris in Compressor

Small pieces of things that do not belong can do terrible damage.

Causes:

• Copper shavings from an installation of a line set.
• Motor went in the trash. Copper shred.

Results:

• Copper in flankings of components.
• Floating bits of copper.

Condenser Tube Fouling and Failure

Condensers have to be clean to function. Fouling is what happens when stuff accumulates within a set of tubes, killing system efficiency and capacity. It is a major source of problems and even failure for power plants.

Types of Fouling:

• Bio-fouling: Slime from the growth of microorganisms.
• Scale: Difficult mineral deposits such as calcium carbonate or calcium phosphate; particularly at water temperatures above 30°C.
• Particles (also Particulates): Sediment of mud, sand or debris.
• Corrosion: When the metal is damaged due to chemical reactions.
• Erosion-corrosion: A mix of hydraulic wear and rust.

Reasons for fouling and tube failure:

• Bad water management: Not controlling water chemistry leads to scale, corrosion, and biology.
• Low water flow: Low flow rate may result in scaling and attacking.
• Improper operation: Stuff like operating in a vacuum can seem like a good idea.

Results:

• Less effective in transmitting heat.
• Increased energy consumption.
• Reduced chiller lifespan.
• Tube leaks, pitting, cracking, bulging.

Mitigation:

• Cleaning: chemical cleaning or mechanical cleaning (brushes, scrapers).
• Water Treatment Program: Test water frequently, observation by sight and drain dirty water to assure a continuous supply of new water.
• Maintain Proper Flow Rates: Critical to prevent depositing and corrosions.
• Predictive Services: Eddy Current Tube Analysis can bi-pass by destructive testing to see the condition of the tubing, to check pitting, cracking, and to see bulging, before the leaks show up.

The Real Cheat Code? Root Cause & Proactive Maintenance

Treating the symptom is like putting a band-aid on a bullet wound. You have to get to the root cause if you are going to prevent repeat failures. Figuring out why something broke is the true superpower.

Predictive Maintenance: A Health Plan For Your Chiller

This is where you steal a march. Rather than waiting for something to break, you leverage data to anticipate issues and act before they’re catastrophic. That translates to less down time, longer equipment life and reduced operating costs.

Here is the roster of services that are your chiller’s best friends:

• Vibration Analysis: We also look at your chiller’s “vibration signature” and compare it to a massive database to detect things like bearing wear or alignment issues. This is telling you the manner of wear of the component.
• Oil Analysis: This isn’t just for seeing how much oil you have. It’s a matter of finding out what exactly is wearing on your chiller the hardest, whether it be the oil itself, the compressor, contaminants messing with your system, or some sort of wear and tear ridden part.
• Refrigerant Analysis: A lab inspects your refrigerant for acidity, moisture, oxides and percent of oil to make sure that it’s in perfect condition. Dirty refrigerant can lead to problems such as copper plating, oxidation and pitting.
• Motor Current/Electrical: The analysis of the electrical condition of the power to the motor which can reveal shorted rotor bars, high resistance connections or damaged end rings.
• Eddy Current Tube Analysis: Economical non-destructive method of inspecting condenser and evaporator tubes for wall thinning, pitting, cracking, or bulging, which could lead to leaks.
• Alignment & Balance Service: Technicians wield laser technology to rectify misalignment and unbalance and confirm that success with vibration analysis.
• Water Treatment: Resolves scale, corrosion, biological growth and sludge, all of which increase energy use and decrease equipment life.
• Lithium Bromide Testing: We do this to make sure your lithium bromide charge works correctly as well as corrosion protection for absorption chillers.
• Vibration Alarming App: Monitors your chiller, pump, fan, and other rotating equipment 24/7 and notifies you when vibration is outside limitsICollectionViewLib.

This means they’re not just Fancy Tech, they’re the intel you need to make smart, timely repair recommendations and max your cooling system.

Wrapping It Up: When to Tap Out and Call in a Pro

Troubleshooting a chiller can be frustrating. Now, this guide provides the map, but some problems are complicated, dangerous or simply besidethatsof a simplefix. If you are not eligible, or if the problem continues after you conduct your initial self-checks, consult a professional. Seriously, chillers are costly and dangerous. Don’t try to be a hero; know when to bring in the pros.

FAQ

Here are some frequently asked questions you may have about keeping your chiller in check:

Q: What are the top 3 reasons a chiller fails? A: The most common problem is improper operation, failure to maintain or having the wrong size chiller for the job.

Q: My chiller isn’t cooling. Starting with anything I can look at? A: I’d begin by looking at the outlet temperature of the chiller in comparison to the setpoint. Then check the evaporator for ice, and the condenser for being clean, with good airflow/water flow. You should also inspect whether the coolant fluid is worn out, and if your refrigerant level is low.

Q: Why is my chiller so loud? A: Rattling noises can indicate loose parts or fan or belt vibrations, broken bearings, or vibrations in the tubes. It could also indicate low refrigerant charge.

A Dirty Filter Can Your Avoidably Filthy Filters Even Really Cause Big Chiller Problems? A: Absolutely. A dirty filter, whether air, fluid or filter drier, severely impedes flow (air, coolant or refrigerant) — it degrades efficiency, overworks components, and can lead to freezing and pressures that are too high or too low.

Q: My compressor is tripping. What’s going on? A: This could be several things such as there being a loose connection, low refrigerant pressure, a defective thermostat, incorrect line voltage, or even a run capacitor being connected backwards. The problem could be electrical, like a mis-wire, bad start components, or voltage spikes.

Q. Refrigerant floodback and flooded starts – what gives? A: Floodback occurs during compressor operation when liquid refrigerant flows into the compressor. Flooded starts happen when refrigerant vapor condenses in the compressor’s sump during the off-cycle and on start-up, oil instead of refrigerant is drawn into the scrolls. Both damage is significant as a mechanical damage.

Q: How crucial is a cleanup of the system after a compressor breakdown? A: It’s vital. If your compressor broke because of an electrical problem, then the refrigerant has sludge, water and corrosive acid. And they paint that compressor on it and send you down the road, not cleaning it right and not replacing that driers; your running probably right back to your compressor failure.

Q Why Does My Chiller Keep Alarming for High Pressure? A: High discharge pressure can be a result of dirty condenser coils, restricted air and/or water flow across the condenser, high ambient temperature, or an overcharge of refrigerant or noncondensables in the system.

Q: What is predictive maintenance? A: These are higher level diagnostics, such as vibration analysis, oil analysis, refrigerant analysis and eddy current tube analysis. They can also predict when a component might fail so you can schedule repairs before something breaks, saving you money and downtime. Proactive strategy at its best.