Honeywell VC PRODUCT DATA

VC Series

Zone Valves

BALANCED 2-WAY AND 3-WAY HYDRONIC VALVES

PRODUCT DATA

VC actuator

2-way	3-way
VC valve body	VC valve body

Design

Application

Honeywell VC Series balanced 2-position hydronic valves are used in domestic and small commercial heating and cooling applications to control the flow of hot and/or cold water. They consist of an actuator, valve and a cartridge assembly

2-way valves are designed for on-off zone control of domestic systems. 3-way valves can be piped for either diverting or mixing valve applications in domestic central heating and/or cooling systems. Both versions can be used to control individual fan coil, radiator, space heater or convector applications. Depending on the model selected they can be controlled by a low or line voltage SPST or SPDT controller such as a room thermostat, aquastat or flow switch.

VC Series hydronic valves are designed to take advantage of sinusoidal valve actuator travel, and therefore operate silently and reduce water hammer. Through internal logic the actuator only takes power while driving the valve to the commanded position.

The actuator head is removable without affecting the integrity of the water system. All actuator versions are interchangeable with any valve body, offering the highest flexibility for boiler production line assembly, and maintenance. The valve piston construction allows for port sealing that is independent of the differential pressure across the valve. Flow through the 2-way valve can be in either direction, so the ports are not designated. 3-way valves are suitable for both diverting water from AB to A or B, and from A or B to AB.

VC Series zone valves consist of:

•2-way or 3-way valve housing available with various connection ends

•Spindle and cartridge assembly

•Actuator with cable or Molex™ socket

•Pipe fittings (most versions)

Materials

•Valve housing made of bronze

•Spindle made of stainless steel

•Cartridge made of Ryton™ (polyphenylene sulphide) and Noryl™ (polyphenylene oxide)

•O-ring seals made of EPDM rubber

•Actuator cover made of Noryl™ (94V-0)

•Actuator base made of Ryton™ (94V-0)

Features

•Rugged design

•Control by a low or line voltage SPST or SPDT controller

•Minimal actuator power consumption

•Pressure differential up to 4 bar

•Double insulated actuator

•Quick connect electrical connections

•Quick and easy replacement of moving parts

•Actuator head installation does not require draining of the system

•High flow rate capacity

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VC SERIES

Specifications

Medium	Water or water-glycol mixture
	(max. 50% glycol content),
	quality to VDI 2035
pH-value	8...9.5
Operating temperature	1...95°C (34...203°F)
	120°C (248°F) short duration
	peak
Ambient temperature	max. 65°C (149°F)
Operating pressure	max. 20 bar (290 psi) static
	max. 100 bar (1,450 psi) burst
Differential pressure	max. 4 bar (58 psi)
kvs (cv)-values	see chapter “Dimensions” below
Flow	2-way: flow can be in either
	direction. When actuator is not
	mounted valve is in closed
	position
	3-way: bottom port is marked
	AB. End ports are marked A and
	B. When actuator is not
	mounted port A is closed.

Function

VC Series 2-position hydronic valves are used in domestic and small commercial applications to control the flow of hot and/or cold water. They consist of an actuator, valve and a cartridge assembly.All moving and sealing parts of the valve are constructed in the cartridge assembly. The ports are sealed with O-rings on the outer surface of the piston.

When the valve stem is driven down to open port A the water will flow through the hollow piston to the other port. In case of

Voltage	24 V, 50-60 Hz (blue label)
	200-240 V, 50-60 Hz (red label)
Power consumption	4 VA
	(when valve position changes)
Auxiliary switch rating	1.0 A @ 250 V, 50-60 Hz
	(minimum 0.05 A @ 24 Vdc)
Nominal timing	Valve opens in 7 seconds
	(20% faster for 60 Hz)
Electrical termination	1. Molex™ socket: requires
	mating connector,
	alternatively
	2. With integral 1 m leadwire
Shipping temperature	-40…65°C (-40…149°F)
Humidity rating	5…95% RH (non-condensing)
Atmosphere	non-corrosive, non-explosive

a 3-way valve with the piston driven down port B is sealed, allowing flow between port AB and port A. With the stem up the flow is between port AB and port B.

The valve family offers a variety of versions of pipe connections to suit the different applications. The valve pressure loss characteristic is dependent on the pipe connections/ dimensions. For the actual valve rating please refer to the specification section.

2-way valve

With an SPDT (3-wire) actuator

On a call for heat, the NO controller contacts close and the valve opens. When the valve is fully open, the cam closes switch SW1 and opens switch SW2. When the need for heat is satisfied the NC controller contacts close, energising the valve through SW1 and closing the valve. When the valve is fully closed, the cam closes SW2 and opens SW1. The valve is ready for the next call for heat.

With an SPST (2-wire and common) actuator

On a call for heat, the controller contacts close, RLY1 is e- nergized making the NO contacts in switch SW3 causing the valve to open. When the valve reaches the fully open position the cam closes switch SW1 and opens switch SW2. When the need for heat is satisfied, the controller contacts open, RLY1 is de-energized and the valve motor is driven through SW1 and the NC contacts of SW3. When the valve reaches the fully closed position, the cam closes SW2 and opens SW1. The valve is ready for the next call for heat.

For both types of actuator a power failure will leave the valve at the position it was when interrupted. When power is restored, the valve will respond to controller demand.

Fig. 1. Fluid flow through 2-way VC valve

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3-way diverter valve

With an SPDT (3-wire) actuator

On a call for heat, the NO controller contacts close, the valve closes port B and opens port A. When port A is in the fully open position the cam closes limit switch SW1 and opens limit switch SW2. When the need for heat is satisfied the NC controller contacts close, energising the valve through SW1, causing port A to close. When port A is fully closed the cam closes SW2 and opens SW1. The valve is ready for the next call for heat.

With an SPST (2-wire and common) actuator

On a call for heat the controller contacts close, RLY1 is energized making the NO contacts in switch SW3, causing port B to close and port A to open. When port A reaches the fully open position the cam closes switch SW1 and opens switch SW2. When the need for heat is satisfied, the controller contacts open. RLY1 is de-energized making the NC contacts in SW3 and port A is driven closed through SW1 and the NC contacts of SW3. When port A is in the fully closed position the cam closes SW2 and opens SW1. The valve is ready for the next call for heat.

For both types of actuator a power failure will leave the valve at the position it was in when interrupted. When power is restored, the valve will respond to controller demand.

Fig. 2. Fluid flow through 3-way VC valve

Wiring

Figures 3 and 4 show wiring connections for 2-way and 3-way valves. Port A open and closed denotes valve open and closed for 2-way, and AB-A open and AB-B open for 3-way valves respectively. A means for disconnection from the supply having a contact separation of at least 3 mm in all

Fig. 3. Logic sequence diagram with 3-wire actuator for SPDT contoller

poles must be incorporated in the fixed wiring. On Molex™ connector models, actuator and auxiliary switch voltages must be the same to meet the approval requirement. For mixed voltages, the cable assembly version is recommended.

Fig. 4. Logic sequence diagram with 2-wire + common actuator for SPST contoller

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