Carrier 42BVC, 42BHC manual Application data, Basic definitions, Unit Hand Piping Components

Application data

Basic definitions

Unit hand — When facing the supply air outlet from the front of the unit (air blowing in your face), your right hand will be the right hand side of the unit and your left hand the left hand side of the unit.

UNIT HAND

PIPING COMPONENTS

SYMBOL/SKETCH	DESCRIPTION	CV FACTOR		RATING*
		1/2	3/4	PSI	F
	MANUAL AIR VENT: Threaded brass needle valve
	with screwdriver slot for adjustment.
	Application — Body brazed into high point of heat-	N/A	N/A	400	100
	ing and cooling coils for bleeding air from coil. Stan-
	dard item on all hydronic coils (not used on steam
	or DX coils). Should not be used in lieu of main sys-
	tem air vents.
	AUTOMATIC AIR VENT: Nickel plated brass valve,
	fiber-disc type, with positive shut-off ballcheck and
	quick vent feature via knurled vent screw.
	Application — Optional replacement for manual air
	vent. Automatically passes minute quantities of air
	through the fiber discs which expand upon contact	N/A	N/A	125	240
	with water, completely sealing the valve. As air
	accumulates, the fiber discs dry and shrink, repeat-
	ing the cycle. Not recommended for removing large
	quantities of air encountered during initial start-up
	or subsequent 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
	Application — Used where possible for all tubing
	joints for best joint integrity.
	CIRCUIT SETTER: Variable water flow balancing
	valve with manual adjustment knob, pointer, per-
	cent-open scale, memory stop and integral pres-
	sure read-out ports.	2.12	3.9	300	250
	Application — Used for close tolerance water flow
	balancing. Positive shut-off ball valve feature allows
	usage as combination balancing and shut-off valve.

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.

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