DIVISION 1 - GENERAL REQUIREMENTS - IDEAS-EC

C. Electronic Operators: Operator selected for full shutoff at maximum pump differential pressure.2 .9 CONTROL DAMPERSA. AMCA rated, parallel or opposed blade design. Form frames from not less than 16 gaugegalvanized steel with mounting holes for flange and enclosed duct mounting. Form damper bladesfrom not less than 16 gauge galvanized steel, with maximum blade width of 6 inches.1. Blades secured to 1/2-inch diameter, zinc plated steel shaft, with nylon or oilite bearings.Blade linkage hardware to be zinc-plated steel and accessible for maintenance. Endssealed against spring loaded stainless steel blade bearings.2. Inflatable seal blade edging or replaceable butyl rubber or neoprene seals at all blade edgesand top, bottom, and sides of the frame. Seals to provide leakage at less than 10CFM/square foot of damper area, at differential pressure of 4 inches wg in accordance withAMCA 500.3. Size damper linkage to provide linear flow of equal percentage.2 .10 CONTROL VALVESA. General: Factory fabricated, quiet in operation, and arranged to fail in either a normally open ornormally closed position in the event of power failure. The open or closed position shall be asspecified or as required to suit job conditions.B. Globe Pattern:1. Up to 2 inches: Bronze body, bronze trim, rising stem, renewable composition disc,screwed ends with backseating capacity repackable under pressure.2. Over 2 inches: Iron body, bronze trim, rising stem, plug type disc, flanged ends, renewableseat and disc.3. Hydronic Systems: Service rating at 125 psi WSP and 250 degree F. Stainless steel orbrass replaceable plugs and seats. Two-way valves shall have equal percentage flowcharacteristics and three-way valves shall have linear flow characteristics.C. Butterfly Pattern: Iron body; bronze, aluminum-bronze, or stainless steel disc; resilient,replaceable seat, wafer or lug ends; extended neck.. Service rating at 125 psi WSP and 250degrees F. Use for two position control only.D. Terminal Unit Control Valve: Bronze body, bronze trim, replaceable plugs and seats, servicerating at 125 psi WSP and 250 degrees F. Two-way valves shall have equal percentage flowcharacteristics and three-way valves shall have linear flow characteristics.1. Two-Position Operator: Synchronous motor with enclosed gear train, dual return springs,valve position indicator. Valves spring return to normal position.2. Modulating Operator: Self contained, linear motor, actuator with 60 second full travel,with transformer and single throw, double pole contacts.E. Hydronic Valve Sizing:1. Two-Position Valves: Select line size valve.15915-4ELECTRIC AND ELECTRONIC CONTROLS