Ideal Logic Combi 24 Installation Manual

[Henry Gallagher]

TheKeston combi boiler range offers first-class comfort in a compact, wall-hung appliance small enough to fit inside a standard kitchen cupboard*. Fully modulating and highly efficient, this combi is available in two output options: 30kW and 35kW. Combining flexibility with a user-friendly design, the Keston C30 and C35 boilers feature carefully selected components chosen to maximise reliability.

By connecting them to the unique Keston Twin Flue System, the C30 and C35 Combi boilers can be situated almost anywhere in your home. While a conventional combination boiler uses a concentric flue and must be installed on an external wall, the twin flue C30 and C35 can be sited up to 27m** from the flue outlet, offering a flexible home heating solution for a variety of domestic installations.

Keston C30 and C35 is Boiler Plus compliant out of the box as a weather compensation kit is supplied as standard. This allows your boiler to measure the outside temperature and adjust the boiler flow accordingly to reach an ideal and consistent temperature, thus saving energy.

Designed to deliver maximum comfort all year round, the Combi range allows heating and hot water functions to be controlled independently. Together with inbuilt frost protection and weather compensation supplied as standard, Combi is a central heating solution you can rely on.

The Keston 22mm System Filter is a magnetic filter for use with Keston Combi and System boilers. The compact design is easy to install and fits on horizontal or vertical pipework in both flow directions.

It works in the beginning, even getting it to heat works, but after some time it (10-15 minutes) it stops working (OT conn loss). Was using the thermostats original wiring at first (close to 12-15m length) and tried it temporarily with a new cable (1m length) because i tried to rule it out that it was the cable, but gave the same result

Update HA to the laatest available version. If u had quite old one - you might need to do update several times.

P.S. We have updated or blog post on diyless to correspond new HA format. Should work for now.

Strange that boiler target temperature is oscillating so frequent. Would be nice to see if there are any errors. Is that diyless thermostat with xiaomi ble? Or just master shield and built in/mqtt sensor?

I send an average calculated room temperature value to the OT Stat. I then schedule the set point of the OT stat using an average of the different room set points throughout the day which seems to work pretty well.

I have shelly TRVs on the radiators which deal with the room set points separately and avoid overshoot in the individual rooms. With a towel rail and hall radiator without control to give expansion if all TRVs are closed.

I have a calculated max flow temp sensor which is calculated using an old school VT curve with input from an external temp sensor. Currently looking at pushing this back into the OT gateway to dynamically adjust the maximum flow temperature value.

Regarding the state of the ha thermostat, i think that maybe it is more logical to use the state_attr of your ha thermostat as trigger than the simple temperature difference (setpoint - room temperature). In your ha thermostat config you can choose the cold&hot_tolerance in a way that the modulating shield can do its job more easy. I choose it a bit higher, because i have overshoot sometimes during the first cycle.

I have an Ideal ESP1 35 Combi boiler. Section 2.18 INSTALLER WIRING of the service manual describes OT installation -Combi-Esp1-Installation-And-Servicing-222353-1_inst.pdf. The high-voltage thermostat wiring is removed and the 2 cables are connected to the OT low-voltage side.

Now the ESP is communicating correctly with HA it still appears the communication with the boiler still fails; in that all the values that would be generated by the boiler return 0.00C with the exception of OT integral error which returns 25.00

Can you show your wiring for now?

From the manual i see that by default your boiler has short wire on room and ot terminals.

Leave room terminals shorted and remove it from ot, and then connect OT master shield to opentherm terminals.

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