Ideal Logic System S18 Boiler Instruction Manual
Ideal Logic System S18 Boiler
Ideal Logic System S18 Boiler
Ideal Logic System S18 Boiler
Ideal Logic System S18 Boiler
Ideal Logic System S18 Boiler Instructions
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Ideal Logic System S18 Boiler Specifications
| Feature | Specification |
|---|---|
| Boiler Type | Wall-mounted, condensing system gas boiler (room sealed C13/C33/C53, fan assisted) |
| Rated Heat Output | 18 kW |
| G.C. Appliance No. (Benchmark No.) | 41-796-86 |
| Gas Type / Supply Pressure | Natural Gas 2H - G20 - 20 mbar (LPG conversion kit available) |
| Heat Input (Net CV) Min / Max | 4.9 kW / 18.1 kW |
| Heat Input (Gross CV) Min / Max | 5.4 kW / 20.1 kW |
| Gas Consumption Min / Max | 0.500 m³/h / 1.872 m³/h |
| CH Output at 70°C Mean Water Temp (Non Condensing) | 4.8 kW - 18.0 kW |
| CH Output at 40°C Mean Water Temp (Condensing) | 5.1 kW - 19.1 kW |
| ErP Nominal Heat Output Full Load / Part Load | 18.1 kW / 5.9 kW |
| Seasonal Space Heating Energy Efficiency (ηS) | 93% |
| Seasonal Space Heating Efficiency Class | A |
| Useful Efficiency Full Load / Part Load | 90.0% / 98.5% |
| SEDBUK 2005 / SEDBUK 2009/2012 | 91.1% / 89.7% |
| Annual Energy Consumption (QHE) | 56 GJ |
| Sound Power Level Indoors (LWA) | 44 dB |
| NOx Emissions / Classification | 24 mg/kWh (Gross) / Class 6 |
| Auxiliary Electricity Consumption | Full load 0.025 kW, Part load 0.003 kW, Standby 0.002 kW |
| Standby Heat Loss | 0.05 kW |
| Power Consumption | 75 W |
| Electrical Supply | 230 V ~ 50 Hz, must be earthed |
| Fuse Rating | External: 3 A; Internal: T4 A HRC L250 V |
| Injector Size | 4.15 mm |
| CO2 Content (± 0.7) | Max CH 9.3% / Min CH 8.3% |
| Average Flue Temperature - Mass Flow Rate | 58°C - 8 g/s |
| CH Flow Temperature Range | 30°C - 80°C |
| Water Flow Rate (20°C Differential) | 13 l/min (2.8 gal/min) |
| Head Available for System | 4.5 m.w.g. (14.7 ft.w.g.) |
| Maximum Working Pressure (Sealed Systems) | 2.5 bar (36.3 psi) |
| Pressure Relief Valve | Non-adjustable, preset lift pressure 3 bar |
| Expansion Vessel | 8 litres, initial charge pressure 0.75 bar |
| Pressure Gauge Range | 0 - 4 bar |
| Water Content (Central Heating) | 1.2 litres (0.26 gal) |
| Heat Exchanger Material | Cast aluminium |
| Gas Supply Connection | 15 mm copper compression |
| CH Flow / Return Connections | 22 mm copper compression |
| Flue Terminal Diameter | 100 mm |
| Maximum Horizontal Flue Length | 9.0 m |
| Maximum Vertical Flue Length | 7.5 m |
| Flue Elbow Equivalent Length | 45° elbow 0.6 m / 90° elbow 1.0 m |
| Flue Hole Diameter | 127 mm core drill |
| Condensate Trap / Drain Outlet | Siphonic 75 mm trap / 21.5 mm overflow pipe fitting |
| Casing Dimensions (H x W x D) | 700 mm x 395 mm x 278 mm |
| Packaged Weight / Lift Weight | 31.3 kg / 27.3 kg |
| Servicing Clearances | Above 165 mm, below 100 mm, sides 2.5 mm, front 450 mm |
| Electrical Protection Rating | IP20 |
| Casing Material | White painted mild steel with white polymer front panel |
| Destination Country | GB |
Ideal Logic System S18 Boiler Details
The Ideal Logic System S18 is a system boiler with full sequence automatic spark ignition and fan-assisted combustion. It arrives fully assembled with a circulating pump, pressure gauge, PRV and CH expansion vessel, so there are fewer separate parts to fit during installation. Everything is operated from a simple front panel with a temperature knob, a Mode button, a Restart button and a high-resolution status display. The display shows a flame symbol whenever the burner is lit and uses L and F codes to report lockouts and faults.
The built-in boiler frost protection works in every mode as long as the boiler has permanent mains power. If the water in the boiler drops below 5°C, the burner fires and keeps running until the water reaches 19°C. The pump also runs briefly once every 24 hours as a self-check, even when there is no heating demand. Ideal notes that the boiler must be wired to a permanent live supply. Without it, frost protection will not work and the warranty is invalid.
Intelligent Load Optimisation stops the boiler from switching on and off too often when the heating load is small. If the flow temperature reaches the CH target plus 4°C, the burner switches off. When it relights, it drops to minimum rate over 60 seconds and stays there for 10 minutes. Normal operation resumes after those 10 minutes, or once the CH demand has been off for more than one hour.
If no outside sensor is fitted, the knob sets the flow temperature between 30°C and 80°C. When an outside sensor is connected, the knob sets a nominal room temperature between 10°C and 30°C instead, and the flow to the cylinder is fixed at 80°C. The boiler can also be set to 2x Switched Live operation, where SL1 handles CH/DHW demand and SL2 handles DHW demand. It works with Halo controls, OpenTherm and weather compensation, and it can be linked to Ideal's Link remote monitoring.
The siphonic condensate trap lowers the risk of the condensate freezing. If the pipe does freeze, the boiler makes a gurgling noise and then locks out with an L02 or L0d code. You can thaw the frozen section with warm, never boiling, water or a heat pack, then restart the boiler. Inside the property, condensate pipework needs a minimum internal diameter of 19 mm. Outside, it needs at least 30 mm, and horizontal runs must fall at least 52 mm per metre.
Installers can enter Installer Mode by holding Mode and Restart together for more than 5 seconds. This mode shows the last three faults and lets the installer run the burner at maximum (SH) or minimum (SL) rate. It also has a 5-minute venting function (UF) and pump speed settings (P1 at 100%, P7 at 70%). During commissioning, the CO reading must be below 350 ppm and the CO/CO2 ratio below 0.0040 at both rates.
The heat exchanger is aluminium, so only approved inhibitors should be used, such as Fernox, Sentinel X100, Adey MC1, MBI, Scalemaster SM-1 PRO or Calmag CM100. Do not fill the system with artificially softened water. For the warranty to apply, the Benchmark commissioning must be completed, the boiler must be registered with Ideal, and it must be serviced every year by a Gas Safe Registered engineer.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Ideal Logic System S18 Boiler, and we answer them below.
