Carrier 42C, 42S, 42D, 42V specifications Piping Components cont, Symbol/Sketch

Table 5 — Piping Components (cont)

SYMBOL/SKETCH	DESCRIPTION		CV FACTOR			RATING*		STEAM
		1/	2	in.	3/ in.	PSI	F	USE
					4
	STRAINER: Y-type body with 50 mesh stain-
	less steel screen.
	Application — Used for removal of small parti-
	cles from system water during normal system
	operation. Should not be used in lieu of main	9.0			19.0	400	250	N/A
	system strainers. Strainer screen may have to
		Clean			Clean
	be removed during initial high pressure sys-
	tem flushing during start-up. Screen should be
	removed and cleaned per normal mainte-
	nance schedule (provisions for strainer blow-
	down not provided).
	GATE VALVE: Manual shut-off valve.
	Application — Used for unit isolation during	19.8			36.0	200	200	NO
	system flushing, servicing, etc. Do not use for
	water balancing.
	GLOBE VALVE: Standard pattern, manual
	shut-off and throttling valve.
	Application — Used for unit isolation. Not rec-	1.8			3.9	200	200	NO
	ommended for high flow rates due to relatively
	high pressure drop.
	COMPRESSION STOP VALVE:
	Manual shut-off valve.
	Application — Used for unit isolation during	2.3			5.4	150	200	NO
	system flushing, servicing, etc. Not recom-
	mended for high flow rates due to relatively
	high pressure drop.
	BALL VALVE: Manual balance and shut-off
	valve.
	Application — Used for unit isolation and
	water flow balancing. Without memory stop	4.0			7.5	400	200	YES
	feature water balance point must be marked
	by installer (if necessary). Check specifica-
	tions for service fittings required when used
	for water balancing.
	BALL VALVE WITH MEMORY STOP:
	Manual balance and shut-off valve.
	Application — Used for unit isolation and
	water flow balancing. The adjustable memory	4.0			7.5	400	200	N/A
	stop feature allows return to the balance point
	after shut-off. Check specifications for
	service fittings required when used for water
	balancing.

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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