A face$-$and$-$bypass damper assembly at a cooling coil is sometimes used in humid climates to achieve greater dehumidification for a given amount of sensible cooling, instead of permitting all the air to pass over the cooling coil. Given the hardware in the following figure, arrange the control system to regulate the temperature at $24$C and the relative humidity at $50$ percent. If both the temperature and humidity cannot be maintained simultaneously, the temperature control should override the humidity control. The spring ranges available for the valve and damper are $28$ to $55$ and $48$ to $76$ kPa. Draw the control diagram and specify the action of the thermostat and humidistat, whether the valve is normally open or normally closed, and which damper is normally closed.