5.Individual damper sections shall not have a single dimension (length or height) greater than 48". Provide a minimum of one damper actuator per section.
6.Modulating dampers shall provide a linear flow characteristic where possible. Size the dampers to achieve this characteristic and and consider approved blade dampers fot this application.
7.Dampers shall have exposed linkages.
B. Control dampers shall be parallel or opposed-blade type as below or as scheduled on drawings.
1.Outdoor and/or return air mixing dampers and face-and-bypass (F&BP) dampers shall be combination parallel/opposed-blade, approximately 57% OB, arranged to direct airstreams towards each other.
2.Other modulating dampers shall be opposed-blade type.
3.Two-position shutoff dampers may be parallel or opposed-blade type with blade and side seals.
2.05LOCAL CONTROL PANELS
A. All outdoor control cabinets shall be fully-enclosed, NEMA-1 construction, with hinged door, key-lock latch, baked-enamel finish, removable sub-panels, UL-listed, wall-mounted or free-standing as indicated on plans.
B.Panels shall house the microprocessor, modem, communication interface, all controllers (except those required at VAV boxes), relays, indicators, clocks, switches, pilot lights,
override timers, etc., to allow quick access for adjustment and troubleshooting.
C.Manual switches and indicating devices shall be flush-mounted on panel face.
D. Internal components shall be securely mounted on removable sub-panels. Each component shall be individually labeled with function and device identification, as shown on control/interlock shop drawings.
E. Interconnections between internal and face-mounted devices pre-wired with color-coded stranded conductors neatly installed in plastic troughs and/or tie-wrapped. Terminals for field connections shall be UL-listed for 600-volt service, individually identified per control/interlock drawings, with adequate clearance for field wiring. Control terminations for field connection shall be individually identified per control drawings.
F. Provide on/off power switch with over-current protection and a 1-1/2” main air gauge for control pressure sources to each local panel. Provide a 120-volt duplex outlet inside each control panel that houses a DDC controller (except VAV controllers) if there is not an out-
