Carrier 42S, 42C, 42D, 42V specifications Vated. Consult factory for normally open valve Applications

Table 5 — Piping Components (cont)

SYMBOL/SKETCH	DESCRIPTION	CV FACTOR				RATING*		STEAM
		1/	2	in.	3/ in.	PSI	F	USE
					4
	2-WAY MOTORIZED VALVE: Electric 2-position flow
	control valve (open/closed). Normally closed body
	with manual override lever. Installed in supply line to
	unit.
	Application — All standard control and valve pack-
	ages are based upon normally closed valves (valve							YES
	electrically powered open and closed by spring
								15
	return when electric power removed). Manual	2.3			2.3	300	200
								PSI
	override lever allows valve to be placed in the open
								MAX.
	position for secondary (unit) flushing, constant water
	flow prior to start-up, etc. Manual override is auto-
	matically disengaged when valve is electrically acti-
	vated. Consult factory for normally open valve
	applications.
	3-WAY MOTORIZED VALVE: Electric 2-position flow	5.0			5.0
	control valve (closed to coil/open to bypass or open		SERVICE
	to coil/closed to bypass). Normally closed with man-
	ual override lever. Installed in supply line to unit.	2.8			2.8
	Application — Same comments as 2-way motorized			BYPASS
	valve except with manual override lever engaged the
						300	200	N/A
	valve is open to both ports and water flow will take
	the path of least resistance through the valve pack-
	age (not necessarily 100% through the coil).

MODULATING VALVE (Optional)
(Non-Spring Return, Floating Point Actuator):
Modulating valves are designed to control the flow in
the circuit by making incremental adjustments to the
flow path within the valve.
Application — To control fluid flow in fan coil units.	4.0	300	200	N/A
On the 42DD,SG,SJ,SH commercial fan coil units,
the factory-provided modulating valve has applica-
tion restrictions. In these models, the valve packages
are located in the air stream, downstream of the coil.
Due to the ambient temperature limitations of the
modulating valves, the valves can be used in the
units listed above only with a 2-pipe cooling system.
MODULATING VALVE (Requires ETO [Engineer-
ing to Order])
(Spring Return): Modulating valves are designed to
control the flow in the circuit by making incremental
adjustments to the flow path within the valve.				N/A
Application — Same comments as non-spring return	4.0	300	200
except when powered, the actuator moves to the
desired position, at the same time tensing the spring
return system. When power is removed for more
than two minutes the spring returns the actuator to
the normal position.
AQUASTAT: Water temperature sensing electrical
switch.
Application — Clips directly on nominal size 1/2 in. or
3/4 in. copper tubing for water temperature sensing.
Must be correctly located for proper control
operation.

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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