05TA Service Manual
SERVICE OPERATIONS
7/24/13
9-2
Float switch assembly
Part #:
Switch assembly only
Float Switch.
The float switch is installed on a header assembly that is attached to the freezer shell.
Valves are provided for isolation of the float switch assembly if replacement or servicing is
necessary. The float switch closes as the level of refrigerant in the freezer rises and opens as the
level falls.
The float switch is connected to the “A” solenoid valve coil. This is the solenoid valve directly
before the hand expansion valve. Therefore when the refrigerant level in the freezer drops, the float
switch closes, thereby energizing and opening the “A” liquid feed solenoid until sufficient level has
been reached to open the float switch. The float switch has a fixed 1/2” differential.
The float switch is installed at the correct height at the factory and should not need to be adjusted.
The float switch is installed at the position that provides highest capacity. The correct height will
produce compressor superheat which climbs throughout the freeze cycle to approximately 30° F.
FIGURE 9-2
Hansen Refrigerant Float Switch
Float calling for
refrigerant
Float satisfied – Not
calling for refrigerant
Attractor
Lever Arm
Magnet
Spring
s
Summary of Contents for P118F/HE100
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