FTS MAXI-COOL - Page 60

Appendix A: Troubleshooting
Maxi-Cool
52 Rev 007, 04/12
© SP Scientific 2012
CAUTION! ONLY QUALIFIED PERSONNEL SHOULD PERFORM MAINTENANCE ON THE
REFRIGERATION SYSTEM, AND ONLY EPA CERTIFIED TECHNICIANS SHOULD EVACUATE
OR CHARGE REFRIGERANTS.
Problem
Possible Cause
Solutions
Unit not cooling
properly
Heat load is above unit’s rating
Check so see that all lines have adequate insulation,
and that there are no local sources of heat that may be
contributing to the load.
Refrigerant leak.
Enlist a qualified, certified refrigeration technician to
connect gauges and check static charge. If this
confirms a leak, have the system leak checked, repair
leak, and recharge system to proper level. Contact SP
Scientific Service for assistance in leak checking and
charging the system if needed.
Ball valve is closed
Open ball valve
Fluid flow is inadequate
See "FLUID FLOW IS INADEQUATE
Temperature
Controller will not
control
Cooling valve is sticking
Adjust temperature set point to cycle the cool indicator
on/off. This should result in a 'clicking' sound from
inside the machine
Temperature
Controlling but not
very well? See
controller
instructions for PID
tuning
Open Sensor.
Measure resistance of sensor. It should be
approximately 100 ohms. If it is not, a new sensor is
needed. Contact SP Scientific Service for new sensor
Connection on controller has
come loose
Check all connections on controller inside the unit. If
any are loose or disconnected, reconnect them
Low voltage to solenoid valves
The controller is operating properly but because of
inadequate voltage to solenoid valve, the valves are
not opening and closing as needed. Correct voltage
supplied to the unit.
Defective solenoid valve
The controller operating properly, but the solenoid
valve is not responding because of a defect. Replace
coil. If problem persists, contact SP Scientific Service.
Fluid flow is
inadequate
Viscosity of fluid is too high for
intended temperature range
Change fluid to a fluid with lower viscosity.
Pump screen blocked (if using
a high pressure pump such as
HPP2)
The inlet to the pump has a screen filter that is
accessed by removing the insulation from the pump
and removing the large nut on the pump housing.
Ball valve is closed
Open ball valve
Plumbing lines have become
restricted or broken
Check plumbing lines and repair as necessary
Impeller of pump has been
damaged
Remove pump and check impeller, contact factory for
replacement pump or impeller. Determine cause of
damage and correct cause to prevent future damage