Carrier 42D, 42C, 42S, 42V a42-4174, Two-WayMotorized Control Valve Package, a42-4175, Coil

The 2-way motorized valve motor drives valve open and a spring returns valve to normally closed position (no water flow with unit OFF).

Supply connection at coil will be swage fit for field braze (standard) or union (option). Return connection at coil will be factory brazed if isolation valve only. Addition of any other component will require swage fit for field braze or optional union connection.

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

•4 Pipe — Hydronic Cooling and Heating

NOTE: A 1/4-in. bypass line is included in the piping pack- age when a 2-way valve is specified with a control package containing an automatic changeover device.

a42-4174

MOTORIZED

M

LEGEND

Ball Valve

Motorized 2-Way Valve

Fig. 44 — Two-Way Motorized Control Valve Package

The 2-way motorized valve motor drives valve open and a spring returns valve to normally closed position (no water flow through coil with unit OFF).

The aquastat bleed bypass bleeds a small amount of water from supply to return when control valve is closed (required for system water temperature sensing by aquastat). Aquastat (A) clips on supply line upstream from aquastat bleed bypass (as shown at right). It senses system water temperature to prevent cooling operation with hot water in system piping or heating operation with chilled water in system piping. Additional aquastat required to lock out the optional auxiliary electric heat when hot water in system.

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.).

a42-4175

MOTORIZED

M

		BALL VALVE
(1) GATE
(1) BALL	R
(1) 2-WAY MOTORIZED	MOTORIZED
COIL	2-WAY VALVE	GATE
	M	SHUT OFF
	A
	S
	BYPASS

2-PIPE SYSTEM (One Valve Package) Application:
• 2 Pipe — Hydronic Cooling and Heating		BALANCING	BALL VALVE
• 2 Pipe — Hydronic Cooling and Heating with Auxiliary	(2) BALL
		VALVE
Electric Heat	(1) BALANCING	R
	(1) 2-WAY MOTORIZED
NOTES: Additional aquastat required as noted above.
	COIL		BALL VALVE
		M
		S	BYPASS
LEGEND			A
		MOTORIZED
Balancing Valve		2-WAY VALVE
Ball Valve			CIRCUIT SETTER
	(1) BALL
Circuit Setter	(1) CIRCUIT SETTER	R
Gate Shut Off Valve	(1) 2-WAY MOTORIZED	MOTORIZED
	COIL	2-WAY VALVE	BALL VALVE
		M
Motorized 2-Way Valve		S	A
		BYPASS

Fig. 45 — Two-Way Motorized Control Valve Package with Aquastat Bleed Bypass Line

46