Carrier 42V, 42C, 42S, 42D specifications a42-4176, Coil

On the 3-way motorized valve flow is normally closed to coil and open to system return. Motor closes bypass flow to sys- tem return while opening flow through coil. Water bypasses coil and flows directly to system return when unit is OFF.

The aquastat (A) clips on supply line upstream from 3-way valve (as shown above). It senses system water tempera- ture to prevent cooling operation with hot water in system piping or heating operation with chilled water in system pip- ing. Aquastat(s) required for 2-pipe cooling and heating with automatic changeover control and/or auxiliary electric heat.

A bypass balancing valve may be specified in the bypass line to permit equal flow balancing.

Supply and return connections at coil will be swage fit for field braze (standard) or unions (option).

Check job specifications for system pressure, pressure drop limitations and flow rate prior to selecting valve package components or valve package size (1/2 in., 3/4 in., etc.).

2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYSTEM (Two Valve Packages) Application:

•2 Pipe — Hydronic Heating Only

•2 Pipe — Hydronic Cooling Only

•2 Pipe — Hydronic Cooling with Total Electric Heat

•2 Pipe — Hydronic Cooling and Heating

•2 Pipe — Hydronic Cooling and Heating with Auxiliary Electric Heat

•4 Pipe — Hydronic Cooling and Heating

LEGEND

Balancing Valve

Ball Valve

MBall Valve with Memory Stop Circuit Setter

Gate Shut Off Valve

Motorized 3-Way Valve

*When aquastat is used for automatic changeover, bypass is required as indicated by dashed line.

NOTES:

1.Packages factory furnished and installed.

2.Valves are 5/8-in. ODS unless otherwise specified.

3.If an automatic flow control valve is added, it will be located on supply line between shutoff valve and coil (or motorized control valve, if supplied).

	a42-4176
	MOTORIZED
	M
BALANCING
VALVE	MOTORIZED	BALL VALVE
(1) BALL	3-WAY VALVE
(1) 3-WAY MOTORIZED	R	BYPASS
	M
COIL	S	BALL VALVE
		BALL VALVE
	MOTORIZED	(WITH MEMORY STOP)
(2) BALL (ONE WITH
	3-WAY VALVE	M
MEMORY STOP)
	R
(1) 3-WAY MOTORIZED	M	BYPASS
COIL
	S	BALL VALVE
	MOTORIZED	BALL VALVE
(1) GATE	3-WAY VALVE
(1) BALL	R
(1) 3-WAY MOTORIZED	M	BYPASS
COIL	S	GATE
		SHUT OFF VALVE
	BALANCING	BALL VALVE
(2) BALL
	VALVE
(1) BALANCING
	R
(1) 3-WAY MOTORIZED	M	BYPASS
COIL	S	BALL VALVE
	MOTORIZED
	3-WAY VALVE
	MOTORIZED	CIRCUIT SETTER
(1) BALL
	3-WAY VALVE
(1) CIRCUIT SETTER	R
(1) 3-WAY MOTORIZED	M	BYPASS
COIL
	S	BALL VALVE

Fig. 46 — Three-Way Motorized Control Valve Package

47