Carrier 42C Series Product Data

Also see for 42C Series: Installation, Start-Up and Service Instructions Installation instructions Product data Product data Installation and start-up instructions

Carrier 42C Series Product Data Manual pdf 27 page image

27Valve packagesThere are limitations on physical size of pneumatic valves,quantity and type of matching components, and requiredcontrol interface. See Symbols and Placement of Valvesdiagram.Consult factory before ordering any special valve pack-age components that are not covered in this book.Valve packages are shipped with the units or in unit car-tons. Valve packages include belled ends for field solderingto coil connections.All factory-furnished cooling valve packages arearranged to position as much of the package as possibleover an auxiliary drain pan or drip lip. This helps minimizefield piping insulation requirements.a42-213tfSYMBOLS AND PLACEMENT OF VALVESCoil Connections (Positions A & B) — When isolation valve only is added to supply or return line, the isolation valve will be factorybrazed to the coil stub-out. Addition of any other component or connection to the supply or return line will change the respective coilconnection(s).Service Fittings (Positions C & D) — Optional fittings for attaching pressure/temperature sensing devices to obtain pressure drop or tem-perature differential across coil. Used with ball valve or balance valve where extremely accurate water flow balancing is required.Water Flow Balancing (Positions E, F, & H) — Only one device per total valve package to be used for balancing water flow through thecoil. When isolation valve (ball valve or ball valve with memory stop at position H) is used for water flow balancing, do not specify additionalbalancing device at position E or F. When balancing device is specified at position E or F, isolation valve does not require balancing featureat position H (with a 3-way motorized valve, a bypass balancing valve may be specified in the bypass line to permit equal flow balancing).Strainer (Position G) — Does not include blow down fitting and should not be used in lieu of main piping strainers.Isolation Valves (Positions H & J) — Normally requires one each on supply and return line (see exception under circuit setter). Whenposition H is used for balancing (ball valve or ball valve with memory stop), check specifications for service valve requirements.a42-4222