what is the default position of the valve this controls - open or closed?

Good Afternoon These valves are spring return to closed (so normally closed) Regards Buy Plumbing Online

My existing one has 3 wire, will this work as a replacement? What happens to the 4th wire?

Mine used the 4 cables....live/neutral, switched live from the thermostat then the switched live to the boiler.

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Danfoss HPA2 Actuator, 4 Wire

Product ID: 48420128

Details

Brand
Danfoss
Colour
White and
Connectivity technology
Wired
Controller type
Push Button
Included components
Valve actuator
Model name
HPA2

⚡230V AC power for reliable performance

🔄Spring return mechanism for fail-safe valve closure

🔌4-wire connectivity for seamless integration

AED 317

Duties & taxes included

In stock

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Description

🔧 Elevate your HVAC game with precision and peace of mind!

DURABLE TRUSTED - Made in the UK with a 12-month warranty and a 4.7-star rating from nearly 1,000 professionals.
FAIL SAFE SPRING RETURN - Automatically closes valve on power loss, safeguarding your HVAC system and boosting automation reliability.
UNIVERSAL COMPATIBILITY - Fits HPV22 22mm valve bodies and replaces major brands like Landis & Gyr, Pegler Sunvic, and Potterton.
INTEGRATED AUXILIARY SWITCH - SPST switch enables smart signaling and smooth integration with advanced control systems.
PRECISION CONTROL AT YOUR FINGERTIPS - Manual push-button operation ensures intuitive and accurate valve actuation.

The Danfoss HPA2 Actuator is a 230V, 4-wire, 2-port normally closed valve actuator featuring a spring return mechanism and an SPST auxiliary switch. Designed for HVAC and industrial fluid control, it offers reliable manual push-button control, universal compatibility with popular valve bodies, and a fail-safe valve closure on power loss. Manufactured in the UK, it comes with a 12-month warranty and is highly rated by professionals.

Specifications

ASIN	B003QZKN26
Best Sellers Rank	23,062 in DIY & Tools ( See Top 100 in DIY & Tools ) 166 in Central Heating System Accessories
Brand Name	Danfoss
Colour	White and Black
Connectivity Protocol	Wired
Connectivity Technology	Wired
Control Method	Push Button
Controller Type	Push Button
Country Of Origin	United Kingdom
Customer Reviews	4.7 4.7 out of 5 stars (985)
Display Type	manual
Included Components	Valve actuator HPA2
Item Type Name	Valve actuator HPA2
Item Weight	0.52 Kilograms
Manufacturer	Danfoss
Manufacturer Part Number	HPA2
Manufacturer Warranty Description	12 months.
Model Name	HPA2
Model Number	HPA2
Mounting Type	Surface Mount
Power Source	230V AC
Special Features	Spring Return Mechanism, Auxiliary Switch
Specific Uses For Product	Boiler
Temperature Control Type	Manual
UPC	772040546052
Voltage	230 Volts

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