Vogt HEC-10, Service Manual

Page: 89 / 114

HEC-Series Service Manual
SERVICE OPERATIONS
10/21/01
9-7
FIGURE 9-5
Ice Bin Thermostat (Dual Ice Type)
1. Cover bulb with ice. Use a continuity tester to see if the contacts are open. It should take
approximately 10-15 seconds for the contacts to open.
2. Remove bulb from ice. Check the time it takes for the contacts to close. It should take a
minimum of 3 minutes (4 to 5 minutes preferred) for the contacts to close when the bulb hangs
free in a bin approximately 1/2 full of ice with the bin doors closed.
3. Turning the adjustment screw clockwise raises the setting. This adjustment makes the contacts
open quicker at a higher temperature.
4. Turn the adjustment screw counter-clockwise lowers the setting. This adjustment makes the
contacts open slower at a lower temperature.
5. Make sure the bulb is mounted firmly in the bin bracket after adjustment.
6. Form a “drip loop” in capillary tubing to thermostat bulb. See FIGURE 3-12, Thermostat Bulb
Installation.
If it becomes necessary to install a new bin thermostat, the above procedure should be followed for
making the adjustment.