Why does my Immergas ZEUS 24 kW Boiler temperature overload thermostat activate frequently?
Frequent activation of the temperature overload thermostat may be due to a few reasons: lack of water in the boiler, insufficient water circulation in the circuit, or a blocked circulator. To address this, check that the pressure gauge values are within admissible limits and ensure that radiator valves are not all closed.
What to do if the fan works but ignition discharge does not occur on the Immergas Boiler burner train?
If the fan in your Immergas Boiler is working but ignition discharge does not occur, the safety air pressure switch may not be changing contact. Ensure that: the intake/exhaust duct is not too long, the intake/exhaust duct is not partially blocked, the diaphragm on the fume exhaust is adequate for the length of the intake/exhaust ducts, and the fan power supply voltage is not less than 196 V.
Guidance on suitable installation locations, wall preparation, clearances, and general safety precautions during boiler installation.
Key dimensions, diagrams, and a table detailing the physical size of the boiler unit.
Details on gas, hydraulic, and electrical connections, including combustible gas quality and LPG storage considerations.
Instructions for indoor installation, including sealed chamber configurations, fume separator adjustments, and resistance factor calculations.
Procedure for initial boiler ignition, including checks for gas type, pressure, and correct operation.
Safety warnings for users, including avoiding direct vapors, prohibiting use by unskilled persons, and precautions for temporary shutdown.
Explanation of fault codes, LED signals, and remote display codes for boiler anomalies.
Guidance on diagnosing and resolving common boiler issues such as gas smell, ignition failure, and irregular combustion.
Procedure for converting the boiler to different gas types, including injector replacement and parameter adjustments.
Instructions for adjusting the boiler's minimum and nominal thermal power via the gas valve.
Guide to accessing and modifying boiler operation parameters through the circuit board programming phase.
List of essential checks and maintenance tasks to be performed annually to ensure optimal boiler performance and safety.
Tables listing detailed combustion parameters, including gas nozzle diameter, supply pressure, and flue gas analysis.
Guidance on suitable installation locations, wall preparation, clearances, and general safety precautions during boiler installation.
Key dimensions, diagrams, and a table detailing the physical size of the boiler unit.
Details on gas, hydraulic, and electrical connections, including combustible gas quality and LPG storage considerations.
Instructions for indoor installation, including sealed chamber configurations, fume separator adjustments, and resistance factor calculations.
Procedure for initial boiler ignition, including checks for gas type, pressure, and correct operation.
Safety warnings for users, including avoiding direct vapors, prohibiting use by unskilled persons, and precautions for temporary shutdown.
Explanation of fault codes, LED signals, and remote display codes for boiler anomalies.
Guidance on diagnosing and resolving common boiler issues such as gas smell, ignition failure, and irregular combustion.
Procedure for converting the boiler to different gas types, including injector replacement and parameter adjustments.
Instructions for adjusting the boiler's minimum and nominal thermal power via the gas valve.
Guide to accessing and modifying boiler operation parameters through the circuit board programming phase.
List of essential checks and maintenance tasks to be performed annually to ensure optimal boiler performance and safety.
Tables listing detailed combustion parameters, including gas nozzle diameter, supply pressure, and flue gas analysis.
This document describes the Immergas Zeus 24 - 28 kW boiler, a wall-mounted appliance designed for heating environments and producing domestic hot water. It is available in 24 kW and 28 kW models, with specific technical data provided for each.
The Zeus boiler is an accumulation-type water heater with a 45-liter capacity, featuring a large coiled stainless steel heat exchanger pipe for reduced hot water production times. It is designed to operate at atmospheric pressure, heating water below boiling temperature. The boiler can be connected to a heating system and a hot water circuit that match its performance and capacity.
The boiler is equipped with an anti-Legionella thermal treatment function for the storage tank, which can be activated via the thermoregulation system. During this phase, the water temperature in the storage tank exceeds 60 °C, posing a burn hazard. Users are advised to control this DHW treatment and install a thermostatic valve at the DHW outlet if necessary to prevent burns.
The boiler supports various installation configurations:
The boiler features an electronic modulation system that adapts its potentiality to the actual heating demand of the house, operating within a variable gas pressure field between minimum and maximum heating power.
General:
Zeus 24 kW Specifics:
Zeus 28 kW Specifics:
Common Specifications:
Control Panel: The control panel includes LEDs for flame presence, domestic hot water, heating function, temperature anomalies (insufficient circulation, delivery probe, ignition block, over-temperature, fumes pressure switch), and a stand-by/remote control/reset selector switch. It also features selector switches for domestic hot water temperature and heating water temperature, and a boiler manometer.
Ignition: To ignite the boiler, ensure the heating system is filled to 1-1.2 bar pressure and the gas cock is open. Turn the main selector switch to the "Domestic/Remote Friend ControlV2" or "Domestic Hot Water" position. Fixed lights on LEDs 4-8 indicate voltage presence and output water temperature.
Remote Controls and Chronothermostats (Optional):
Programming the Circuit Board: The boiler's operation parameters can be programmed to adapt to specific needs. This includes adjusting minimum and maximum heating power, heating switch-on timer, heating ramp timing, domestic water thermostat/boiler hysteresis, circulating pump function, and gas type (Town Gas G110 - Industrial gas).
Anti-freeze Protection: The boiler has a built-in anti-freeze function that activates the pump and burner when the system water temperature drops below 4°C, stopping once it exceeds 42°C. This function is guaranteed if the boiler is fully operative, not in "block" status, and electrically powered. For prolonged absences, the system should be drained or anti-freeze substances added.
Automatic Slow Ignition Function: During switch-on, the electronic card performs an increasing gas delivery ramp of preset duration, preventing the need for calibration or preparation in various conditions.
Chimney Sweep "Function": This function forces the boiler to run at maximum output for 15 minutes, allowing technicians to check combustion parameters. It is activated by pressing the Reset key for 8-15 seconds without domestic water or heating requests.
Periodical Maintenance: Heating plants require periodical maintenance and regular energy efficiency checks in compliance with national, regional, or local provisions. Immergas recommends a yearly cleaning and maintenance contract.
System Filling: After connection, the system is filled via the filling valve. Filling should be done slowly to release air bubbles. The boiler has an automatic venting valve on the circulator (check if the cap is loose). Close radiator air vent valves only when water is delivered, and close the filling valve when the manometer indicates 1.2 bar.
Gas System Start-up: Before starting, open windows and doors, avoid sparks, bleed air from pipelines, and ensure the internal system is properly sealed.
Boiler Start-up (Lighting): For the Declaration of Conformity, ensure the internal system is sealed, gas type matches settings, correct ignition, and gas flow/pressure values comply with the manual. Check safety devices, main circuit-breaker, and intake/exhaust terminals.
Domestic Hot Water Boiler Device: The lower inspection flange allows practical control and easy internal cleaning of the boiler and coiled heat exchanger. The magnesium anode holder cap is standard for internal corrosion protection. The efficiency of the magnesium anode should be checked annually by a skilled technician.
Circulation Pump: The Zeus kW boilers have a built-in circulation pump with 3-position electric speed control. For optimal operation, especially in new systems, the pump should be used at maximum speed. If the pump is blocked after prolonged inactivity, unscrew the front cap and turn the motor shaft with a screwdriver to release it.
System Shutoff Valves (Optional Kit): Allows the boiler to be drained separately for maintenance without emptying the entire system.
System Zone Kit (Optional): For heating systems divided into zones, Immergas offers zone system kits to interlock zones with separate adjustments and maintain high water flow rates.
Polyphosphate Batching Kit (Optional): Reduces lime-scale formation and preserves heat exchange and domestic hot water production conditions.
Cleaning and Maintenance:
Casing Removal: To remove the casing for maintenance, disassemble the lower cover, unscrew dashboard fasteners, unscrew two fixing screws on the casing, unhook the lower part, and pull the casing forwards and up to detach it from upper hooks.
Yearly Appliance Check and Maintenance:
Electronic Card Periodical Self-Check: During heating mode or stand-by, the function activates every 18 hours. In domestic circuit mode, it starts within 10 minutes after drawing, lasting approximately 10 seconds. During self-check, the boiler remains off.
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General