Danfoss ARV22 Data sheet

Datasheet

ARV22

Automatic By-Pass Valve

Introduction	The ARV22 is an automatic by-pass control valve
	intended for use in domestic central heating
	systems. Its function is to allow a minimum flow
	to be maintained through the boiler as the water
	flow through the pump is reduced by, for example,
	radiator thermostats. The ARV22 automatically
	opens and closes depending on system load.
	Whentheradiatorthermostatsareopenandcalling
	for heat the ARV22 remains closed, allowing the
	full boiler/pump output to circulate; as radiator
	thermostats start to close so the ARV22 opens to
	allow a flow through the by-pass.
	The ARV22 automatic by-pass control valve must
	be adjusted at the time of installation to suit the
	central heating system.
	The ARV22 will protect most domestic boilers
	against low flow rates.
	O	Automatic operation
	O Supplied complete with ¾" BSP and 22mm
		compression fittings
	O	Ensures quiet operation
	O Suitable for domestic system with boiler sizes
		up to 22 kW
Application
Feed and	Wiring
Expansion Tank	Centre Programmer
Mains
Water

Zone

Valves

Cylinder

Thermostat

Room

Thermostat

ARV22

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<![endif]>Boiler

Heatplan control system utilises two 2-port H Series valves

Order Code

Type	Code Number
ARV22	099-1063

Part No. 380v06 04/08

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Datasheet

ARV22 Automatic By-Pass Valve

Specifications

Maximum Working Pressure	4.0 Bar
Maximum Working Temperature	100°C
Setting Range	10 - 50 kPa
Connection Size (inlet)	22mm
Connection Size (outlet)	22mm

Capacity

ARV22 Setting Diagram

70

60
50
40
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30
20
10
0
								0.35
0.00		0.05	0.10	0.15	0.20	0.25	0.30		0.40	0.45	0.50	0.55
						Litres/second

Capacity	The valve can be installed in any attitude. The flow
	through the valve must be as per the direction of
	the flow arrow stamped into the valve body.
	The valve is supplied with two 22mm compression
	couplings for use with 22mm copper tubing.
	Dimensions are shown right.
	IfreplacingapreviousARV22theexistingpipework
	may need a small adjustment to fit a new ARV22.
Setting Instructions	Before running the boiler, set the ARV22 to the
	maximum setting by turning the white knob
	clockwise until the knob is mechanically stopped.
	Ensure that the radiator thermostats are set to
	their normal control temperature.
	Turn on the boiler, and allow the temperature to
	stabilise, at this stage the ARV22 will be closed.
	Turn the ARV22 knob slowly counter-clockwise
	until the valve begins to open, this can be
	monitored by feeling the temperature of the
	outlet connection of the valve. At this stage turn
	the knob clockwise half a turn to complete the
	setting process.
	Once the right setting has been established the
	setting can be locked using the transparent cap.

Danfoss can accept no responsibility for possible errors in catalogues, brochures, and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.

All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

Danfoss Randall Ltd.

Ampthill Road

Bedford MK42 9ER

Tel: [phone]

Fax: [phone]

Email: [e-mail]

Website: www.danfoss-randall.co.uk

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Part No. 380v06 04/08

VDPBA212