Chiller Diagnostics & Theory Of Operation

Chiller Diagnostics & Theory Of Operation

Preface: This article contains a lot of Chiller related information about troubleshooting, replacing and acquiring parts. Be sure to use the table of contents to go to the pertinent area.


Identifying An Alarm Status


If the chiller control panel is showing normal but you have an alarm status (red light, audible buzzer, and the alarm output which indicates water protect warning on the laser control panel) it can be a few things. We will explore the basic operation of the chiller's electrical systems and some things to check, as well as information on maintaining and repairing the unit.


V1 Beeping Alarm Reasons (Flow only)
V2 Beeping Alarm Reasons



V1 Chiller Red Alarm Light ON Reasons




System Overview & Precursory Power Checks

Video Overview

Here is a video explaining the systems of the chiller and some thinks to look for when troubleshooting your 5000 series chiller



Wiring Diagram

Here is the wiring diagram for the V1-CW5000 series chiller 




Alarm Troubleshooting Videos:

Alarm Description Troubleshooting Videos
E1 Alarm indicates a High Ambient Air temperature. This could be caused by:
  1. Room temperature being too high, higher that the value controlled by the F6 Parameter
  2. Air Temperature Sensor Failure, it is reading the air temperature incorrectly
  3. Dirty Filters

E2 Alarm indicates a High Water temperature. This could be caused by:
  1. Water temperature being too high, higher that the value controlled by the F4 Parameter
  2. Water Temperature Sensor Failure, it is reading the water temperature incorrectly
  3. Dirty Filters
  4. Dirty Water
  5. Low Water
  6. High Usage

E3 Alarm indicates a Low Water temperature. This could be caused by:
  1. Water temperature being too high, higher that the value controlled by the F5 Parameter
  2. Water Temperature Sensor Failure, it is reading the water temperature incorrectly
  3. Dirty Filters
  4. Dirty Water
  5. Low Water
  6. Super Low Ambient Temperature

E4 Alarm indicates a Room Temperature Sensor Failure. This could be caused by:
  1. Sensor has failed



Troubleshooting E6 Alarm

E6 alarm stands for water flow alarm. When the alarm is triggered, the alarm code and the water temperature will be displayed alternatively  with beeping. In this case, users can stop the beeping by pushing any button, but the alarm code can’t be removed until the alarm conditions are eliminated.


There are many causes for the water flow alarm. It could be the clogging inside the internal/external waterway. It could be that there are impurities inside the water pump. Or it might be wearing out of the pump rotor or wearing out of the pump itself. After the real cause is located, the alarm can be removed. 

Checking the coolant level

ALWAYS CHECK THE COOLANT LEVEL FIRST! Verifying that there is enough clean distilled water in the system is critical. The Preventative Maintenance Checklist advises that you drain the system and refill with fresh distilled water every month.


Water Flow Sensor Failure

Water circulation is normal, but chiller still alarms.
Please open the cover of the chiller to check the water flow switch.





Cut off the four wires, then connect red and red wire, connect black and yellow wire without water flow switch, then check if the alarm will stop after restart the chiller.


If the alarm stops, the switch is broken and needs replacement.

Flow Rate Check:

A good check to perform when getting an E6 Flow alarm is to actually see if the flow from the pump matches the documentation. To perform the test, you will need a gallon jug and a stopwatch (Smartphone app). Make sure the chiller is full, even beyond the green line so that there is a gallon of water to spare.

1. Turn the Chiller Off
2. Disconnect the Inlet Hose off the laser machine and place into an empty gallon jug
3. Prepare the stop watch. Turn the Chiller on
4. When water starts flowing into the Jug, start the timer
5. Stop the chiller and stopwatch when the jug is nearly full (1 Gallon of water in the jug)
6. Compare the stopwatch time to the values in the table below

Chiller Model
Peak Flow Rate L/Minute (gal/minute)
Fastest Time
Target Time
CW-5000
10L/min (2.65gal/min)
22.64 seconds
Under 35 Seconds
CW-5200
13L/min (3.43gal/min)
17.5 seconds
Under 30 Seconds

Checking for proper circulation

Please connect a water hose between water inlet and outlet on chiller to check the water circulation, like below: 




Does alarm stop?


If alarm stops, so maybe the water hose in the laser machine was blocked somewhere, please check like below:







If alarm continues, check if the water circulation is normal from the water hose between water inlet and outlet on chiller (Abnormal condition—intermittent water circulation or without water circulation). 




How To Check The Compressor For Operation


Touch the position shown in the picture with his hand, and see if there is regular vibration after the water chiller is powered on.





How To Check The Capacitor

According to the instructions in the video, use a multimeter capacitance mode to measure whether the capacitor of the water chiller is damaged. (If the measured value shows 0μF, it means the capacitor is damaged).






How To Check & Clean Hall Effect Flow Meter



How To Measure Hall Flow Switch



Alarm Output Continuity Check


Identifying The Components (and links to parts)

Water Pumps

CHILLER PUMP IMAGE WATTAGE CURRENT MAX FLOW MAX LIFT SOURCE
S&A G SERIES P2430 30 1.6A 10L/MIN 10M LINK
S&A H SERIES P2450 50 2A 13L/MIN 12M LINK

24V Power Supplies

CHILLER PSU MODEL IMAGE VOLTAGE CURRENT SOURCE
S&A G SERIES GM42-240160-D 24 1.6A
S&A H SERIES GM48-240200-D 24 2A
S&A I SERIES GM120-2400500-D 24 5A

Water Flow Sensor

CHILLER SENSOR IMAGE VOLTAGE TYPE SOURCE
S&A G, H, AND I SERIES HL-30 24 HALL EFFECT LINK

V1 Chiller Flow Sensor Wiring



Temp Controller

CHILLER CONTROLLER IMAGE DEFAULT SETTING SOURCE
CW 5000 SERIES T-503 INTELLIGENT



Checking, Cleaning, & Replacing Components


Warning
Remove all power prior to performing repairs on the chiller.

Parts Replacement Videos
Parts Replacement Videos






(Be sure to get the fuse from the current socket just in case the new one doesn't have a fuse in it. there is also usually a spare fuse in the toolbox, just in case)






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