WDF
These thermostats are of temperature set and reset structure used for various models of direct-cooling, double-door and two-temperature refrigerators.
Operating range: START: +2 -+8C STOP: -31 - -4C
Adjustment range: MAX: 19 C
Diff: 8 -33C

WPF
General purpose thermostat for Refrigerator. It's temperature and differential temperature could be greatly varied, a force-off function will be available.
Operating range: -30 -+15 C
Adjustment range: MAX: 25 C
Diff: 4 -14 C