Operating modes
Standard, Brager Expert and Brager Expert exhaust gases on the TIS Tronic 260U — what each algorithm optimises, which parameters it exposes, and which to choose.
The mode decides what the fan is chasing: a water temperature, a water temperature via an adaptive algorithm, or an exhaust gas temperature. Change it in Boiler settings → Boiler operating mode.
Standard
The boiler operates in two stages: Operation and Supervision, entirely on the values you set. No adaptation — what you configure is what it does.
In Operation, these settings determine the burn:
- Maximum fan capacity
- Minimum fan capacity
- Threshold fan deceleration
In Supervision, once the set temperature has been reached:
- Fan capacity in supervision
- Fan blowing time (purge time)
- Time between fan blowing cycles
The boiler moves back from Supervision to Operation when the water drops by the boiler hysteresis value. With a 60 °C setpoint and 2 °C hysteresis, the fan restarts at 58 °C.
The exhaust screen is locked in Standard
On the exhaust gas main screen, a padlock on the bar means the set temperature cannot be changed. Active STANDARD mode is one reason for that.
Brager Expert
A smart algorithm that automatically selects parameters to adapt the boiler's current output to the actual demand for thermal energy, while constantly striving to reach the set boiler temperature.
Only two parameters are exposed in the user menu:
- Maximum fan capacity
- Minimum fan capacity
Everything else is chosen by the algorithm. Use this mode when no exhaust gas sensor is fitted.
Brager Expert exhaust gases
The algorithm automatically selects optimal fan settings to maintain a constant exhaust gas temperature. This is what MBtek recommends for the UNI 60, with an exhaust setpoint of 160–240 °C / 320–464 °F.
Requires the PT1000 sensor
Operation in Brager Expert exhaust gases mode requires connecting the temperature sensor
(PT-1000) to T3 and activating it in the controller main menu. The sensor is not included
in the regulator standard kit.
Firing-up time
This mode adds one parameter: firing-up time.
| Parameter | Range | Factory default | MBtek value |
|---|---|---|---|
| Brager Expert exhaust gases — firing-up time | 0–250 min | 10 min | 10 min |
It determines how long the exhaust gas temperature target is held at 300 °C. That drives the fan at the highest possible capacity, which ignites the fuel faster.
Why target exhaust temperature?
Exhaust temperature is a better proxy for combustion quality than water temperature.
- Water temperature tells you how much heat has accumulated; exhaust temperature tells you how the fire is burning right now.
- Too low an exhaust temperature means incomplete combustion and condensing flue gas — tar in the chimney.
- Too high means heat is going up the chimney instead of into the water.
Holding 160–240 °C keeps the boiler in the band where combustion is complete but the heat exchanger is still extracting usefully.
Choosing
| Situation | Mode |
|---|---|
| PT1000 fitted, normal UNI 60 installation | Brager Expert exhaust gases |
| No PT1000 fitted | Brager Expert |
| You need full manual control for diagnosis, or the adaptive algorithm is fighting an unusual system | Standard |
Mode-dependent parameters
| Parameter | Standard | Brager Expert | Brager Expert exhaust |
|---|---|---|---|
| Maximum fan capacity | ✓ | ✓ | ✓ |
| Minimum fan capacity | ✓ | ✓ | ✓ |
| Fan capacity in supervision | ✓ | — | — |
| Purge time | ✓ | — | — |
| Pause between blowups | ✓ | — | — |
| Fan deceleration threshold | ✓ | ✓ | ✓ |
| Exhaust firing-up time | — | — | ✓ |
| Exhaust setpoint editable | — | — | ✓ |
The five everyday fan parameters, with ranges and defaults.
Frequently asked questions
MBtek recommended settings
The exact TIS Tronic 260U settings MBtek specifies for the UNI 60 — boiler setpoint 65 °C, fan 40–80 %, supervision 35 %, hysteresis 2 °C and the full boiler settings list.
User menu
The five fan parameters in the TIS Tronic 260U user menu — maximum and minimum fan output, supervision capacity, purge time and the pause between blowups.