DSA WALL & DSA HOME heating substation for indirect systems

Standard heating substations guaranteeing high system performance

The DSA WALL and DSA HOME heating substations are designed for indirect central heating systems, domestic hot water, floor heating, air conditioning, and more. The substations are equipped with all the necessary devices to regulate heat for the building in accordance with the specifications of the heat supply agreement.

DSA HOME is suitable for single-family homes, apartment buildings, commercial, and industrial facilities. It combines DN20 piping suitable to convey 25 kW for heating and a separate circuit offering up to 40 kW for domestic hot water, with a compact design for efficient installation and operation.
DSA WALL caters to apartment buildings, commercial, and industrial buildings, delivering up to 145 kW for heating and 120 kW for domestic hot water. The DN 25-40 piping to heating circuits supports higher capacity demands. It ensures compatibility with high-parameter district heating networks.

DSA HOME and DSA WALL meet over 90% of technical connection requirements for typical district heating networks. Their modular design allows for configuration of one or two circuits, with easy expansion to a three-circuit substation, ensuring adaptability to diverse heating needs.

Features and benefits

Easy Access to Key Components: Facilitates quick servicing and maintenance, minimizing downtime and ensuring continuous operation.
Advanced Sealing System: Ensures safe, leak-free primary connections, enhancing safety and system integrity.
Optional Insulation: Minimizes heat loss, enhancing energy conservation and reducing utility expenses.
ECL Comfort Electronic Controller: Provides precise control of heating and domestic hot water circuits, ensuring optimal system performance and energy efficiency.
SCADA Access via ECL Portal: Enables remote monitoring and management, offering convenience and enhanced operational oversight.
MicroPlate™ Brazed Heat Exchangers: Incorporates patented plate technology for superior heat transfer, maximizing thermal efficiency and system reliability.
Class A Circulation Pumps: Delivers high performance with low energy consumption, reducing operational costs and environmental impact.

High performance district heating solutions – DSA HOME, DSA WALL & DSE FLEX

Experience efficient, reliable district heating with DSA HOME, DSA WALL, and DSE FLEX. This brochure reveals how each pre‑configured Danfoss substation delivers heating and domestic hot water with ease, energy efficiency, and lasting quality.

DSA HOME is tailored for single‑family homes, DSA WALL suits residential, commercial, and industrial buildings with space‑saving wall‑mounted convenience, and DSE FLEX offers versatile connections for multifamily residential, commercial, and industrial applications.

All feature high‑efficiency MicroPlate™ heat exchangers, precise ECL Comfort control, and remote monitoring via Leanheat® Monitor. Dive into the technical specifications and find the perfect fit for your next project.

Download the brochure

Explore the DSA WALL – Unique features, smart installation & easy maintenance

Discover the DSA WALL district heating station – easy to mount, versatile, and built for efficient heating. This animation pans over the station, highlighting its unique design, modular flexibility, and advanced features.

Learn mounting options, multiple pipe connections, pump protection, draining, cleaning strainers, and replacing the heat exchanger. Check out the animation for practical tips that make installation and servicing simple, safe, and efficient.

Play animation

Documents

Documents
Type	Name	Language	Updated	Download	File type

FAQ

Installer Troubleshooting FAQ – DSA WALL & DSA HOME

The heating circuit is not working – no heat in radiators or floor heating.

Check if the heating circulation pump is running. If not, verify power supply and control signal from the ECL Comfort controller.
Inspect the heating curve settings in the controller – incorrect settings can prevent heat supply.
Bleed air from the heating circuit.
Clean primary and secondary sides filters – blockages reduce flow.
Confirm district heating supply valve is open and supply temperature is within specification.

No domestic hot water (DHW) is being produced.

Check DHW circulation pump operation and electrical connections.
Verify DHW program in the ECL Comfort controller is active.
Test DHW temperature sensor – replace if faulty.
Inspect DHW heat exchanger for scaling or fouling – clean if necessary.
Confirm district heating supply temperature meets DHW requirements.

Heating or DHW temperature is too low.

Adjust heating curve and DHW setpoint in the ECL Comfort controller.
Check supply pressure and temperature from the district heating network – contact utility if below spec.
Clean heat exchanger and filters.
Increase pump speed or replace pump if defective.

Leakage on the primary side pipe connections.

Shut down system and relieve pressure before inspection.
Check gasket seating – reseat or replace if needed.
Tighten connections to Danfoss torque specifications.
Replace damaged gaskets or O‑rings.

ECL Comfort controller or SCADA (ECL Portal) is not communicating.

Verify controller power supply.
Check network cable and connections.
Confirm IP settings match network requirements.
Reconfigure SCADA tool according to Leanheat® Monitor setup guide.

The system is noisy (pumps, pipes, or heat exchanger).

Bleed air from heating and DHW circuits.
Check inlet pressure to pumps (expansion vessel gas pressure) – low pressure can cause cavitation.
Secure mounting brackets and check vibration dampers.

Energy consumption is higher than expected.

Review heating curve and DHW setpoint – overly high settings waste energy.
Enable pump control via ECL Comfort controller to avoid continuous running.
Inspect insulation – replace if damaged or missing.
Clean heat exchanger to restore efficiency.

DHW temperature fluctuates during use.

Check DHW temperature sensor accuracy – replace if faulty.
Verify controller settings for DHW hysteresis and control mode.
Inspect DHW pump for intermittent operation.
Clean DHW heat exchanger – fouling can cause unstable temperatures.

Heating circuit pressure drops frequently.

Inspect for leaks in secondary circuit.
Check expansion vessel charge pressure – recharge if needed.
Bleed air from system.
Verify fill valve operation.

What’s the quickest way to isolate a fault in a multi‑circuit DSA WALL?

Close valves to each circuit one at a time.
Observe system response – if heating or DHW returns, the isolated circuit is the source of the fault.
Focus troubleshooting on that circuit’s pump, controller settings, and heat exchanger.

Are there any common mistakes to avoid during service?

Replacing sensors without checking controller diagnostics – many “sensor faults” are wiring or setting issues.
Forgetting to clean filters before suspecting heat exchanger fouling.
Over‑tightening primary connections – can damage gaskets.
Not checking district heating supply parameters before adjusting internal settings.

What spare parts should installers keep on hand?

Gasket and O‑ring kit for primary connections
DHW and heating temperature sensors
Circulation pump (A‑rated)
Filter elements
Controller backup battery (if applicable)

Related products

Valves

Take control of water flows in HVAC and District energy systems with our hydronic balancing and control valves, motorized control valves, shut-off valves and butterfly valves.

Energy metering

Keep accurate track of energy consumption in any heating or cooling system for transparent cost allocation with our range of energy meters and automatic meter reading solutions.

Heat exchangers

Optimize the heat transfer in HVAC, District energy and freshwater systems with our brazed, gasketed and welded heat exchangers or freshwater distillers.

Stations and domestic hot water

Safely produce, store and distribute hot water in direct and indirect heating systems with our substations, flat stations and charging systems

Electronic controls

Run your District energy system the intelligent way with our electronic Comfort controllers and matching application keys and add an optional monitoring solution to remotely streamline service, maintenance and commissioning.

Differential pressure and flow controllers

Optimize efficiency by reducing heat losses in district energy, heating or cooling systems by establishing a dynamic hydronic balance with our differential pressure and flow controllers.

Leanheat® Software Suite & Services

Danfoss Leanheat® Software Suite & Services is an application-driven suite of the end-to-end software and services that harnesses the power of digitalization to optimize energy production and consumption, increase operational efficiencies, and put building control and maintenance in your hands.

Related applications

District heating

Unlock the grids full potential with end-to-end district energy solutions and get actionable insights enabling continuous optimization and optimal temperature control on both demand and supply side.

Buildings – commercial

Tailored solutions for commercial buildings provide considerable energy, emissions, and cost savings without compromising quality or comfort.