NERAL BD4000 Installation & Operation Manual

01 Identification, safety and use

This manual accompanies model NERAL BD4000. Record SKU, serial number, voltage, fuel and revision before installation. Accessories, functions and protective devices depend on the supplied variant.

Cabin heating and domestic hot-water preparation in a recreational vehicle or converted van. Separate cold/hot-water, warm-air and combustion circuits.

Carbon monoxide: combustion gases must remain outside occupied spaces. Do not operate in a garage or other enclosed location. Keep intakes and flue outlets clear, especially after snow, mud or travel.

Fuel smell, abnormal smoke, leakage or a CO alarm: stop use, move occupants away and have the installation inspected. Do not restart to conceal a fault. Contact emergency services if there is immediate danger.

Fire and burns: keep combustible materials away from the appliance, hot ducts and exhaust. Do not use the service compartment for storage. Allow cooling before inspection and keep children away from hot surfaces.

Power: use the nameplate voltage. Never increase a fuse rating or bypass protection. For a normal stop, allow the controlled cooling cycle to finish before disconnecting power.

Stop before refuelling. Fuel, combustion, gas and mains work require a qualified professional. Install and maintain a CO detector suitable for the application according to its own instructions.

Combi heating: identify the warm-air circuit separately from the domestic-water tank. Confirm pump, pressure, relief valve, draining and frost protection. Do not energise a water element dry. Diesel, gasoline and propane versions each require their own supply. Mains power needs protection and earthing according to the approved design.

02 Variant specifications

Differences between variants

For unpublished values, use the supplied variant's nameplate and data sheet: starting current, fastening torque, pressure, pump flow and protection devices cannot be inferred from power.

03 Recommended applications and output selection

Select according to insulation, outdoor temperature, heated volume and air exchange. For domestic water: water demand, pressure and frost protection. Engine displacement and engine coolant volume are not applicable to this unit.

04 BD4000 family section view

Drawing callouts: identify components before service. A sectional view shows operation; it does not define a disassembly sequence. Check the unit revision before ordering any part.

05 Step-by-step installation

STEP 1 - Prepare the compartment

Secure the base and maintain access to the drain, connections and electronics. Keep the return-air inlet clear and distribute heating outlets.

STEP 2 - Mount the combustion terminal

Use the terminal and ducts for the supplied variant. Observe the TOP marking and intake/exhaust connections. Check every clamp and leak tightness before closing the compartment.

Terminal and duct connections Compartment and return air

STEP 3 - Connect domestic water

Connect cold water and hot outlet without mechanical stress on fittings. Install the safety valve, drain and downward outdoor discharge. Fill with a hot-water tap open until air is expelled.

ACTION DETAIL - schematic

Tank connection

Support the tube. Insert as specified for the supplied connector.

Check retention and sealing.

STEP 4 - Connect the energy supply

Diesel/gasoline: matched circuit and pump. Propane: regulator and line according to the nameplate; leak test by a competent person. Mains: voltage, earth and protection devices for the actual supplied version.

Hot-air distribution Domestic-water connection

STEP 5 - Commission

Test air, water and then combined mode. Test available energy sources separately. Check hot outlets, domestic-water leak tightness and draining. Do not activate heating elements with an empty tank.

06 Electrical connections

DC battery Fuse holder ECU / unit BD4000

+ protected near the battery; dedicated - return

Compatible controller Signal harness

Schematic. Pins, rating and voltage: use the supplied harness.

Mains: separate circuit with grounding and protective devices matched to the rating plate.

Maintain power during cooling. Normal shutdown uses the controller; do not install a switch that interrupts the cycle. Protect cables and connections against water, abrasion and heat.

Circuit detail for the illustrated family. Drawing labels identify components; check connectors, voltage and options on the supplied harness. A mains connection cannot be inferred from nominal power alone.

07 Initial commissioning

08 Operation and controls

Fill the domestic-water tank before water heating. Select an available mode: water, air or combined according to unit; fuel, mains or mixed according to variant. A setpoint does not guarantee immediate tap-water temperature: scalding hazard.

09 Maintenance and winterization

Before use and after travel, inspect ducts, supports, openings, fuel lines and accessible connections. Once cool, remove external debris without directing water into the intake or flue.

Before the season and after storage, have the installation, battery, protection, tightness and combustion checked. Hour-based intervals, exercise-run duration and component life remain to be confirmed for the exact model and revision.

The user may keep access clear and clean cold surfaces using material-appropriate methods. Burner, exchanger, pump, sensor and ECU removal is qualified service work. Do not adjust fuel delivery or thermal protection.

After repair, require leak checks and a full cycle. Record date, hours, symptom, code, part SKUs and technician. Confirm applicable warranty terms with ATLOSON; other warranty policies are not transferred.

Winter storage: stop, allow cooling, switch off the water pump and open taps and drains. Check that the tank and low points actually drain. Before restarting, fill and bleed; never heat an empty tank.

10 Troubleshooting and fault codes

Record the exact code before clearing it. Stop and allow cooling, check the power supply under load, then ducts and the fluid circuit. Correct the cause before a supervised test. A repeated fault requires workshop service.

11 Fault-code table - family controller

Use only with a controller displaying this set of codes. Gas, pump and heating-element outputs depend on the variant.

12 Parts, kits and purchasing

Order by part number and variant. Drawing callouts are not SKUs. Check voltage, fuel and connector before replacement. A complete-system reference is not a maintenance kit.

Records and support

Date / hours: __________________ Work / parts: __________________

Keep the invoice, SKU, serial number and history. For assistance, provide a nameplate photo, code and symptom. ATLOSON support