Pressurizer station for closed heating and air conditioning system, lets off or adds expansion water under electronic control to adjust for water volume fluctuations due to temperature changes

摘要

Pressurizer station uses intermediate expansion tank (11) in the water cycle to supply amount of water needed to adjust for fluctuations in water level due to seasonal temperature changes. Probe (17) detects water level and electronic control unit (23) uses signals from probe and signal generators (19,20) to determine need to add or run off expansion water by operating run off or refill valves (25,30). Expansion tank (11) has desired value signal generator (19) for heating level (19a) and desired value signal generator (20) for air conditioning level (20a). Both signal generators are connected to electronic control unit (23) to adjust expansion water level in tank. Signal generators (19,20) have common level probe (17) connected to control unit. Air conditioning signal generator is mounted above heating signal generator in expansion tank (11). Level probe has a lowest level signal generator (18) which with generators (19,20), has common sensing line (21) to level probe (17). Control unit is connected with run off valve control (26) and refill valve control (31) for tank.