Taylor-Wharton 24K w/ AutoTend - Manual (Page 40)

Temperature reading 10 to 20 degrees warm.
1.
Make sure sensor tube is breathing. If Ice build up is a problem in a humid
environment or if you have a clear polycarbonate sensor tube, the thermocouple
may be attached to the outside of the sensor tube with nylon wire ties. Tuck
thermocouple out of harms way on side or back of sensortube. Do Not attach
thermocouple to fill tube.
•
Prepare an ice water slurry with crushed ice and tap water. Dip or pour LN
2
into a
styrofoam cup to prepare an LN
2
bath. Calibrate the controller. Select MENU,
TEMPERATURE, CALIBRATE TEMPERATURE. Follow the on screen instruc-
tions. Hold the thermocouple in each bath until the control completes its self-
calibration.
•
Make sure the thermocouple is clean and dry before and after each bath.
•
Reposition the thermocouple at the elevation the customer wants to monitor or
control.
Fill Solenoid Cycles On and Off
KRYOS features a Freeze-Guard function where by the valve open duration is
limited, allowed to shut for a short warm-up and then opened again. To confirm or
change the valve open duration:
• Select MENU, USER OPTIONS, CONTROL OPTIONS, FREEZE-GUARD
OPTIONS, VALVE OPEN DURATION.
If the controller detects that the valve is stuck in the open position (i.e., continues to
fill after the valve is de-energized), it will attempt to De-Ice the valve by causing a
rapid cycling of the valve in an attempt to dislodge the blockage.
• To activate or de-activate this feature: Select MENU, USER OPTIONS, CON-
TROL OPTIONS, FREEZEQUARD OPTIONS, VALVE DE-ICING.
Repeated cycling of the solenoid valve could be attributable to moisture invasion on
the controller circuit board.
1. Check gasket seals.
2. Access control board and allow time to fully dry.
Fill Solenoid Makes Humming Noise
1.
Turn fill valve on and off using the control panel. If humming continues, it should
continue to operate reliably. If the noise is excessive, replace solenoid valve.
Transformer Makes Humming Noise
This noise is a normal byproduct of most block transformers. The transformer has a
non-renewable internal fuse to protect the transformer output. If the noise is exces-
sive, replace the transformer.
Display Blanks Our During a Fill
This phenomenon can happen if cold vent gases are spilling into the controller face,
or into the cabinet onto the controller back.
1. Check the seal between the blue lid and the beige cabinet top. The black gasket