Ideal Logic System S15 Boiler Instruction Manual
Ideal Logic System S15 Boiler
Ideal Logic System S15 Boiler
Ideal Logic System S15 Boiler
Ideal Logic System S15 Boiler
Ideal Logic System S15 Boiler Instructions
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Ideal Logic System S15 Boiler Specifications
| Feature | Specification |
|---|---|
| Boiler Type | Wall-mounted condensing system gas boiler (Logic System2 S15) |
| G.C. Appliance No. (Benchmark No.) | 41-796-85 |
| Rated Heat Output | 15 kW |
| Gas Type | Natural Gas 2H - G20 - 20 mbar (I2H) |
| LPG Conversion | Not available for the 15 kW model |
| Appliance Flue Category | C13, C33, C53 (room sealed, concentric) |
| Boiler Input Net CV (Min / Max) | 4.9 kW / 15.1 kW |
| Boiler Input Gross CV (Min / Max) | 5.4 kW / 16.6 kW |
| Gas Consumption (Min / Max) | 0.500 m³/h / 1.537 m³/h |
| CH Output, Non-Condensing (70°C Mean) | 4.8 kW - 15.0 kW |
| CH Output, Condensing (40°C Mean) | 5.1 kW - 15.9 kW |
| CH Flow Temperature Range | 30°C - 80°C |
| Seasonal Space Heating Efficiency Class | A |
| Seasonal Space Heating Energy Efficiency (ηs) | 93% |
| Useful Efficiency (Full Load / Part Load) | 90.0% / 97.8% |
| SEDBUK 2005 | 91.2% |
| SEDBUK 2009/2012 | 89.4% |
| NOx Classification | Class 6 (21 mg/kWh gross) |
| Annual Energy Consumption (QHE) | 47 GJ |
| Sound Power Level Indoors (LWA) | 42 dB |
| CO2 Content (± 0.7) | 9.5% max CH / 8.9% min CH |
| Average Flue Temperature - Mass Flow Rate | 56°C - 6 g/s |
| Injector Size | 4.15 mm |
| Electrical Supply | 230 V ~ 50 Hz, must be earthed |
| Power Consumption | 72 W |
| Auxiliary Electricity (Full Load / Part Load / Standby) | 0.022 kW / 0.011 kW / 0.003 kW |
| Fuse Rating | External: 3 A; Internal: T4 A HRC L250 V |
| Gas Supply Connection | 15 mm copper compression |
| CH Flow / Return Connections | 22 mm copper compression |
| Maximum Working Pressure (Sealed Systems) | 2.5 bar (36.3 psi) |
| Pressure Relief Valve | Preset, non-adjustable, 3 bar |
| Expansion Vessel | 8 litres, 0.75 bar initial charge |
| Pressure Gauge Range | 0 - 4 bar |
| Water Content (Central Heating) | 1.2 litres (0.26 gal) |
| Water Flow Rate (20°C ΔT) | 10.7 l/min (2.4 gal/min) |
| Head Available for System | 5 m.w.g. (16.2 ft.w.g.) |
| Heat Exchanger | Cast aluminium |
| Flue Terminal Diameter | 100 mm |
| Maximum Horizontal Flue Length | 9.0 m |
| Maximum Vertical Flue Length | 7.5 m (product data sheet lists 7.7 m) |
| Flue Elbow Equivalent Length | 45° elbow: 0.6 m; 90° elbow: 1.0 m |
| Condensate Trap | 75 mm siphonic trap; outlet sized for 21.5 mm overflow pipe |
| Dimensions (H x W x D) | 700 x 395 x 278 mm |
| Packaged Weight / Lift Weight | 31.3 kg / 27.3 kg |
| Servicing Clearances | 165 mm above, 100 mm below, 2.5 mm sides, 450 mm front |
| Electrical Protection Rating | IP20 |
| Warranty | 2 years parts and labour when registered within 30 days (subject to terms) |
Ideal Logic System S15 Boiler Details
The Ideal Logic System2 S15 is a compact system boiler designed for fully pumped, sealed central heating systems with a separate hot water cylinder. It arrives fully assembled with a circulating pump, pressure gauge, pressure relief valve and expansion vessel already built in, so installers need fewer external components. It uses full sequence automatic spark ignition and fan-assisted combustion, and a single dual-purpose electrode handles both ignition and flame detection. Ideal says the boiler is designed, developed and made in the UK.
The front of the boiler has a simple set of controls: a Temperature Knob, a Mode button, a Restart button, the system pressure gauge and a high-resolution status display. The display uses clear icons and text, and the flame symbol shows when the burner is lit. Pressing Mode switches the boiler between ON and OFF. If a lockout code beginning with L appears, you can reset the boiler with the Restart button. If it fails to light after five attempts, it shows the L 02 ignition lockout code.
Frost protection works in every mode as long as the boiler has mains power. If the water inside the boiler falls below 5°C, the burner fires and runs until the water reaches 19°C. The pump also runs briefly once every 24 hours as a self-check, which stops it from seizing during long idle periods. For these features to work, the boiler must be wired to a permanent live supply. Ideal states that the warranty is invalid if it is not.
When an outside weather sensor is connected, the temperature knob sets the target room temperature between 10°C and 30°C instead of a flow temperature. Water sent to the cylinder is then factory-set to 80°C. The boiler can also be set up for 2x Switched Live operation through the installer menu, with separate central heating and hot water demand inputs. It supports OpenTherm controls, Ideal's Halo thermostats and the Link remote monitoring solution.
A feature called Intelligent Load Optimisation reduces short cycling. If the flow temperature rises 4°C above the heating target, the burner turns off. When it relights, it drops to minimum rate over 60 seconds and stays there for 10 minutes. Ideal also notes that turning the room thermostat down by 1°C can cut gas use by up to 10%.
The siphonic condensate trap lowers the risk of the drain freezing. If the external pipe does freeze, the boiler makes a gurgling noise and then locks out. The user guide explains how to thaw the pipe safely with warm water or a heat pack, and warns never to use boiling water. Condensate pipework must be plastic, with at least 19 mm internal diameter indoors and 30 mm outdoors. Horizontal runs must fall at least 52 mm per metre.
The installer mode is opened by holding Mode and Restart together for more than five seconds. It shows the last three faults and lets the engineer run the burner at maximum or minimum rate, start a five-minute venting cycle, and set the minimum pump speed. The boiler must be serviced at least once a year by a Gas Safe Registered Engineer. The service includes CO and CO2 checks, with a CO/CO2 ratio limit of 0.004.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Ideal Logic System S15 Boiler, and we answer them below.
