in the water level in the receiver. Float switches shall be adjustable to permit the controlled water level to be changed. Floats and connecting rods shall be copper, stainless steel, or bronze. Provide adjustable vacuum switches mounted on receiver tank to start and stop air pumps in response to vacuum requirements of the heating system. Air and water pump controls shall include alternators and also controls to automatically start the second air or water pump when the first pump fails to meet the air or water demand. Starters: Provide combination magnetic starters with fusible disconnect switches or circuit breakers. Provide low voltage control circuits (120-volt maximum). Indicating Lights: Provide red lights for each pump to show that the pump is running, green lights to show power is on. Manual Selector Switches: Provide "on-off-automatic" switch for each pump. Electrical Wiring: Shall be enclosed in liquid-tight flexible metal conduit. Wiring shall be suitable for 93 degrees C (199 degrees F) service. Control Cabinet: NEMA 250, Type 4 or better, enclosing all controls, with manual switches and indicating lights mounted on the outside of the panel. Attach to pump set with rigid steel framework unless other mounting is shown on the drawings. Accessories Required: Thermometer on receiver below minimum water level. Thermometer shall conform to requirements in Section 23 05 51, NOISE AND VIBRATION CONTROL FOR BOILER PLANT. Basket-type inlet strainer with bolted cover, designed for 275 kPa (40 psig), 100 degrees C (212 degrees F). Provide basket with 3.2 mm (1/8 inch) diameter perforations. Water level gauge on each compartment of receiver. Provide gauge cocks which automatically stop the flow of water when the glass is broken. Provide gauge glass protection rods and drain on lower gauge cock. Compound pressure/vacuum gauge which shall conform to requirements in Section 23 09 11, INSTRUMENTATION AND CONTROL FOR BOILER PLANT.
in the water level in the receiver. Float switches shall be adjustable to permit the controlled water level to be changed. Floats and connecting rods shall be copper, stainless steel, or bronze. Provide adjustable vacuum switches mounted on receiver tank to start and stop air pumps in response to vacuum requirements of the heating system. Air and water pump controls shall include alternators and also controls to automatically start the second air or water pump when the first pump fails to meet the air or water demand. Starters: Provide combination magnetic starters with fusible disconnect switches or circuit breakers. Provide low voltage control circuits (120-volt maximum). Indicating Lights: Provide red lights for each pump to show that the pump is running, green lights to show power is on. Manual Selector Switches: Provide "on-off-automatic" switch for each pump. Electrical Wiring: Shall be enclosed in liquid-tight flexible metal conduit. Wiring shall be suitable for 93 degrees C (199 degrees F) service. Control Cabinet: NEMA 250, Type 4 or better, enclosing all controls, with manual switches and indicating lights mounted on the outside of the panel. Attach to pump set with rigid steel framework unless other mounting is shown on the drawings. Accessories Required: Thermometer on receiver below minimum water level. Thermometer shall conform to requirements in Section 23 05 51, NOISE AND VIBRATION CONTROL FOR BOILER PLANT. Basket-type inlet strainer with bolted cover, designed for 275 kPa (40 psig), 100 degrees C (212 degrees F). Provide basket with 3.2 mm (1/8 inch) diameter perforations. Water level gauge on each compartment of receiver. Provide gauge cocks which automatically stop the flow of water when the glass is broken. Provide gauge glass protection rods and drain on lower gauge cock. Compound pressure/vacuum gauge which shall conform to requirements in Section 23 09 11, INSTRUMENTATION AND CONTROL FOR BOILER PLANT.
235011.docx