Carrier 42 SERIES Application Data page 17

Component Sizing — 1
Manual Air Vent — Standard component - Brazed into high point of hydronic cooling and/or heating coil circuit.
Automatic Air Vent — Brazed into high point of coil circuit.
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) to one of the following:
STANDARD: Swage fitting for field braze.
OPTION: Union(s) added by factory for field connection.
Service Fittings (Positions C & D) — Optional fittings for attaching pressure/temperature sensing devices to obtain
pressure drop or temperature differential accross coil. Used with ball valve or balance valve where extremely accurate
water flow balancing is required.
GAGE COCK: Pressure test only - In supply and return lines.
PRESSURE TEST PORT: Pressure test only - In supply and return lines.
INSERTION TEST PORT: Pressure/Temperature test - In supply and return lines.
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 (See exception, 3-way motorized
valve).
CIRCUIT SETTER: May serve as a positive shut-off valve in lieu of isolation valve at position H
(check service requirements).
BALANCING VALVE: Check specifications for service fitting requirements.
FIXED FLOW: No balancing required - When there are more devices on the supply line of the valve
package than on the return line, the factory may move this device to position E to fit valve package
within allotted space. Consult your factory representative to match the available fixed flow valve to your
job requirements.
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). When position H is used for balancing (ball vall or ball valve with memory stop), check specifications for
service valve requirements.
GATE VALVE: Shut-off only - Do not use for balancing.
BALL VALVE: Shut-off/balance - No memory stop.
BALL VALVE WITH MEMORY STOP: Shut-off/balance - Memory stop allows re-opening to balance point
after usage as a shut-off.
LEGEND For Fig. 1
⁄ nominal (for 5 ⁄ OD copper tubing) or
2 8
3 ⁄ nominal (for
4
17
7 ⁄ OD copper tubing).
8