AIR Tubing and Control Wiring | APC UCCS Temperature Control

2.02AIR TUBING AND CONTROL WIRING

A.Air tubing shall be either copper (ACR) in exposed areas, or Type FR polyethylene (within conduit). Soft copper is acceptable in concealed areas.

B.Cables shall be shielded when so recommended by manufacturer. Conductor size shall be in accordance with manufacturer's recommendations subject to specified minimum size. See Part 3 for allowable types.

C.All insulated wire to be copper conductors, UL labeled for 90C minimum service.

D.Raceway for both wiring and pneumatic tubing shall be per Division 16.

E.The Contractor shall provide and install:

1.TVSS surge protectors for incoming 120 VAC power to all controllers. Surge protectors furnished shall be UL 1449 listed.

2.Transient voltage protection for all twisted pair and coaxial data communication lines between controllers. Provide all required repeaters to assure signal integrity.

2.03CONTROL VALVES

A.Shall be two-way or three-way type for two-position or modulating service as scheduled, shown on drawings, or as specified in Sequence of Operation.

B.Closeoff (differential) Pressure Rating: Valve actuator and trim shall be furnished to provide the following minimum closeoff pressure ratings:

1.Water Valves:

a.Two-way - 150% of total system (pump) head.

b.Three-way - 300% of pressure differential between ports A and B at design flow or 100% of total system (pump) head.

2.Steam Valves: 150% of operating (inlet) pressure.

C.Water Valves: [Note to Consultant: The consultant shall provide a schedule for the

Controls Contractor listing the available pressure drop to be used for valve sizing for each control valve in the project, unless it is a reverse-return system. It is not acceptable to list a single pressure drop to be used for all valves. For a piping system in which modulated two-way valves are used, for example, the valves nearest the pump will have a larger available pressure drop than those farther away from the pump.]

1.Body and trim style and materials shall be per manufacturer's recommendations for design conditions and service shown, with equal percentage ports for modulating service, except where stated otherwise.

JANUARY 2008

UCCS STANDARDS

15950-17