I’m looking at retro-fitting a dehumidifier with a condensate removal pump to eliminate the need to empty the bin (daily during the summer); specifically this pump. This pump has a safety switch designed to be connected to a class II low voltage circuit in series with a thermostat circuit. However, the dehumidifier doesn’t have a low voltage thermostat and the humidistat runs on line voltage:
Based on this, I’m thinking of replacing the bucket shut-off switch with a relay control that is connected to the safety switch and a step-down transformer. However, I’m concerned that without the expected thermostat (and the resistance that would be associated with it) the current in the circuit would be higher than the relay could tolerate. What size resistor should I be using to replace the non-existant thermostat?