Operation and Maintenance Manual, TECS 18.
WELCO INDUSTRIES INC CINCINNATI OH
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The Welco Industries Total Environmental Control system TECS 18 operates from multiple frequency power sources to provide solid-state proportional temperature control of both air conditioning and heating. Three independently controlled pulse-width modulated variable frequency inverters provide variable speed control of a compressor, condenser fan and evaporator fan motors. Zero-crossing heat controls provide 5.6Kw proportional heat and 3.8 Kw ON-OFF heat in the two HEAT modes. The electronic controls are located within the four basic modules. The Evaporator Drawer contains the system control logic in addition to the inverter drive circuitry for the evaporator fan. The Power Deck contains the main system power supplies and the CompCond Drawer contains the inverter drive circuitry for both the compressor motor and the condenser fan.
- Air Conditioning, Heating, Lighting and Ventilating