Indoor Unit Functional Concept ESIE05-032–32 Part 2 – Functional Description312452.5 Draft Avoidance Control 1Purpose Avoid draft for the customer by delaying transfer of the flap to the Po0 (horizontal) position for a certainamount of time when defrosting and in heating thermostat OFF.Heating thermostatOFFThe time chart below illustrates the draft avoidance control 1 in heating thermostat OFF.Defrosting The time chart below illustrates the draft avoidance control 1 in defrosting.Used inputs The draft avoidance control 1 uses the following inputs:When the flap starts to move, there can bea draft. The fan speed decreases to LLspeed but it takes some time because ofits inertia.FanFlapThermostatSettingLLSettingPo0ONOFFFlap motor startsto drive the flap.20 sFlap moves fromsetting position to Po0Po0When the flap starts to move, there can bea draft. The fan speed decreases to LLspeed but it takes some time because ofits inertia.FanFlapDefrostingSettingOffSettingPo0YesNoFlap motor startsto drive the flap.20 sFlap moves fromsetting position to Po0Po0Input Connection onindoor PCBConnection onoutdoor PCBLimit switch for flap 33S —No. of fan turns X26A —Outdoor heat exchanger thermistor (defrost control) — R2T
