01 November 2009
Honeywell has a low-cost means to ensure immediate hot water and reduce water wastage while enabling easier and faster commissioning in buildings with many outlets, such as hospitals, hotels, office blocks and leisure/sports centres. The Kombi 4 throttle and balancing valve is installed in the secondary returns of constant hot water systems to balance the system. An optional thermostatic control attachment additionally maintains constant circulation temperature.
The Kombi 4 is small, costs less than other auto-balancing systems, and is easily fitted using DN15 – DN40 (0.5 inch to 1.5 inch) internal or external threads. Its optional drainage adaptor provides convenient system drainage.
The valve allows easy thermal flushing as required daily for legionella prevention: the temperature control is typically set for 50-55 degrees C and maintains this temperature during normal operation; however, when water at over 70 degrees is flushed through the system for thermal disinfection, the valve automatically opens further to ensure hot water is rapidly distributed in all risers and pipelines, whilst maintaining the balance. When the thermal disinfection process is finished and the water temperature drops, the Kombi 4 returns automatically to its standard control state.
The valve has a visible pre-setting dial with a concealed presetting handwheel.
It is ideal for all potable water applications and is WRAS approved: the housing and all parts with flow-contact are made of corrosion-resistant red bronze. It features a cavity-free cartridge with maintenance-free spindle sealing. The spindle thread is isolated from the flow.