Carrier 42D, 42C, 42S, 42V specifications Piping Components

Table 5 — Piping Components

SYMBOL/SKETCH	DESCRIPTION	CV FACTOR				RATING*		STEAM
		1/ in.	3/	4	in.	PSI	F	USE
		2
	MANUAL AIR VENT: Threaded brass needle
	valve with screwdriver slot for adjustment.
	Application — Body brazed into high point of	N/A	N/A			400	100	NO
	heating and cooling coils for bleeding air from
	coil. Standard item on all hydronic coils (not
	used on steam or DX coils). Should not be
	used in lieu of main system air vents.
	AUTOMATIC AIR VENT: Nickel plated brass
	valve, fiber-disc type, with positive shut-off ball-
	check and quick vent feature via knurled vent
	screw.
	Application — Optional replacement for man-
	ual air vent. Automatically passes minute
	quantities of air through the fiber discs which	N/A	N/A			125	240	NO
	expand upon contact with water, completely
	sealing the valve. As air accumulates, the fiber
	discs dry and shrink, repeating the cycle. Not
	recommended for removing large quantities of
	air encountered during initial start-up or subse-
	quent draining and refilling. Should not be
	used in lieu of main system air vents.
	SWAGE: Copper tube end expanded to accept
	a copper tube of the same size for factory or
	field brazing.	N/A	N/A			300	200	YES
	Application — Used where possible for all tub-
	ing joints for best joint integrity.
	UNION: Combination wrought copper/cast
	brass union assembly, solder by solder.
	Application — Used for quick connect (and dis-	N/A	N/A			300	200	YES
	connect) of valve package components to min-
	imize field labor and facilitate servicing of unit.
	INSERTION TEST PORT: Brass body valve
	for acceptance of test probe (up to 1/ in.
	8
	diameter).
	Application — Installed on one (or both) sides	N/A	N/A			250	250	NO
	of the coil to allow for temperature or pressure
	sensing. Used for close tolerance water bal-
	ancing and service analysis.

LEGEND

Cv — Coefficient of Velocity

DX — Direct Expansion

*Check all system component pressure ratings (coils, values, pumps, etc.) with manufacturer and any applicable local or national piping codes prior to specifying system pressure rating.

NOTES:

1.Motorized 2-way valves have a maximum close-off differential of 25 psi.

2.Motorized 3-way valves have a maximum close-off differential of 10 psi.

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