Thermal Care Accuchiller KSE, Operation, Installation, And Maintenance Manual

27 

Step 8 – Initial Unit Operation 

Enter the desired leaving fuid temperature on the 
chiller HMI. Unless otherwise specified, the chiller is 
factory set to deliver coolant at 50°F. Adjust to the 
desired operating temperature. The chiller should 
now be controlling to the selected temperature. 
Please note that if there is insufficient load the 
compressor may cycle on and off causing swings in 
temperature. 
 

WARNING: Under no circumstance should the High 
Refrigerant Pressure or the Low Compressor Pressure 
switch be deactivated. Failure to heed this warning 
can cause serious compressor damage, severe 
personal injury or death. 

 
Operate the system for approximately 30 minutes. 
Check the liquid line sight glass. The refrigerant flow 
past the sight glass should be clear. Bubbles in the 
refrigerant indicate either low refrigerant charge or 
excessive pressure drop in the liquid line. A shortage 
of refrigerant is indicated if operating pressures are 
low and subcooling is low. Normal subcooling 
ranges are from 10°F to 20°F. If subcooling is not 
within this range, check the superheat and adjust if 
required. The superheat should be approximately 
10°F. If the operating pressures, sight glass, 
superheat, and subcooling readings indicate a 
refrigerant shortage, charge refrigerant as required. 
With the unit running, add refrigerant using industry 
best practices until operating conditions become 
normal. 
 

CAUTION: A clear sight glass alone does not mean 
that the system is properly charged. Also check system 
superheat, subcooling, and unit operating pressures. If 
both suction and discharge pressures are low but 
subcooling is normal, a problem other than refrigerant 
shortage exists. Do not add refrigerant, as this may 
result in overcharging the circuit. 

 
Once proper flow and temperature are achieved, 
press the Stop button. The unit is now ready to be 
placed into service. 
 

Preventive Maintenance 

Once your chiller is in service, follow the 
maintenance procedures as closely as possible. 
Specific site conditions may require repeating certain 
tasks more frequently. The importance of a properly 
established preventive maintenance program cannot 
be overemphasized. Taking the time to follow these 

simple procedures will result in substantially reduced 
downtime, reduced repair costs, and an extended 
useful lifetime for the chiller. Any monetary costs of 
implementing these procedures will usually more 
than pay for itself. 
 
To make this as simple as possible, prepare a 
checklist with the recommended service operations 
and record the date and time when performed. At 
the end of this manual, you will find a checklist for 
this purpose. Please notice that there are locations 
for voltage readings, amperages, etc. for monitoring 
over time. With this information, maintenance 
personnel may be able to correct a potential 
problem before it causes any downtime. For best 
results, take these readings with a full heat load from 
process, preferably with similar operating conditions 
each time. The following is a list of suggested 
periodic maintenance. 
 

Once a Week 

1.

Check to make sure that the To Process 
temperature is reasonably close to the Set Point 
temperature. If the temperature stays more than 
5°F away from the set point, there may be a 
problem with the chiller. If this is the case, refer 
to the Troubleshooting Chart or contact our 
Customer Service Department. 
 

2.

Check the optional integral chiller and/or 
process pump discharge pressures. Investigate 
further if the pressure starts to stray away from 
the normal operating pressure. 

3.

Check the suction and discharge refrigerant 
pressure at the compressor. 
 

4.

Check each refrigerant sight glass for air bubbles 
or moisture indication. Bubbles in the refrigerant 
indicate either low refrigerant charge or 
excessive pressure drop in the liquid line. If the 
sight glass indicates that there is a refrigeration 
problem, have the unit serviced as soon as 
possible. 

5.

Check the compressor oil level in the sight glass. 
View the oil level through the sight glass while 
the compressor is running. The level will vary as 
the compressor loads and unloads.