Carrier 42CA Installation, Start-Up And Service Instructions Manual page 37

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Coil Connections (Positions A & B) — When isolation valve only is added to supply or return line, the isolation valve will be factory
brazed to the coil stub-out. Addition of any other component or connection to the supply or return line will change the respective coil
connection(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 the
coil. When isolation valve (ball valve or ball valve with memory stop at position H) is used for water flow balancing, do not specify additional
balancing device at position E or F. When balancing device is specified at position E or F, isolation valve does not require balancing feature
at 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 water flow balancing
above). When position H is used for balancing (ball valve or ball valve with memory stop), check specifications for service valve require-
ments.
Fig. 33 — Symbols and Placement of Valves
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