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

Table 5 — Piping Components (cont)

SYMBOL/SKETCH		DESCRIPTION		CV FACTOR			RATING*		STEAM
			1/	2	in.	3/ in.	PSI	F	USE
						4
		PRESSURE TEST PORT: Brass body 1/ in.
		4
		service access fitting with removable depres-
		sor type core.
		Application — Installed on both sides of the	N/A			N/A	400	210	NO
		coil to allow for pressure sensing. Attach
		pressure gages to facilitate close tolerance
		water balancing.
		GAGE COCK: Brass shut-off valve with
		1/ in. FPT fitting for attachment of pressure
		4
		gages.
		Application — Installed on both sides of the	N/A			N/A	200	250	N/A
		coil to allow for pressure sensing. Attach
		pressure gages to facilitate close tolerance
		water balancing. May be used in bleed
		bypass line to regulate water flow.
		CIRCUIT SETTER: Variable water flow bal-
		ancing valve with manual adjustment knob,
		pointer, percent-open scale, memory stop
		and integral pressure read-out ports.	2.12			3.9	300	250	NO
		Application — Used for close tolerance water
		flow balancing. Positive shut-off ball valve
		feature allows usage as combination balanc-
		ing and shut-off valve.
		BALANCE VALVE: Variable water flow man-
		ual balancing valve with screwdriver slot
		adjustment screw.
		Application — Often used in conjunction with
		test port fittings for water flow balancing. Bal-	3.0			8.9	150	200	NO
		ance by temperature differential or coil pres-
		sure drop (check specifications for service
		fittings required if balancing by pressure
		drop). May be used in 3-way valve bypass
		line to permit equal flow balancing.
		FIXED FLOW VALVE: Flexible orifice type	Valve orifice size
		(non-adjustable).	determines CV fac-
		Application — Used for water flow balancing.	tor. The orifice of
		Valve automatically adjusts the flow to within	these fixed flow
			valves changes as
		10% of set point. Requires 15 psi
			flow is regulated.
		(35 ft) of additional pump head for proper
			As the water pres-
	FLOW	operation.
			sure increases,				150	160	NO
			the orifice size
			decreases,
			thereby automati-
			cally limiting the
			flow rate to the
			specified gpm
			(±10%).

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.

51