Regulation Of The Water Temperature; Protection Against Low Water Or No Circulation; Overheat Temperature Protection; Circulating Pump (Available Pump Head) - Baxi MainEco Combi 24 Installation And Service Manual

4. Technical description
4.5

Circulating pump (Available pump head)

700
600
500
1
400
317
300
253
200
127
100
0
0 200 400 600 800
16
2
30 kW
20 kW
24 kW
1000 1200 1400 1600
860
1030 1250 1500
Q (l/h)
R000684-A
Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
4.4.6.

Regulation of the water temperature

The boiler is fitted with an electronic temperature regulator having an
outlet and return temperature probe. The flow temperature can be set
between 20°C and 90°C. The boiler reduces its power when the set
outlet-temperature is attained. The cutout temperature is the set
heating outlet-temperature + 5 °C.
4.4.7. Protection against low water or no
circulation
The boiler is fitted with a safety device to prevent the shortage of water
based on temperature measurements. By reducing its output when
the water flow rate is in danger of becoming insufficient, the boiler
continues to operate as long as possible. In case of insufficient ΔT
≥ 50°C flow or an excessive increase in flow temperature, the boiler
will enter shutdown mode for 10 minutes. When there is no water in
the boiler, or if the pump is not running, the system is locked
(breakdown)
In the event of a fault, the status signal for the B button on
the connection box flashes red.
¼For more detailed information, see chapter: "Shutdowns and
lock-outs", page 63.
4.4.8.

Overheat temperature protection

The maximum temperature protection locks the boiler if the water
temperature becomes too high (110°C).
In the event of a fault, the status signal for the B button on
the connection box flashes red.
¼For more detailed information, see chapter: "Shutdowns and
lock-outs", page 63.
Anticycle function is active when heat demand is active and
the flow temperature is too high with respect to the
setpoint. The anticycle time can be active between 3
and 9 minutes depending on system temperatures.
The boiler is fitted with an on/off circulation pump.
1 Combi 24 - 28
2 Combi 35
Manometric height central heating circuit
H
Water flow ( ΔT=20K)
Q
02092014 - 7619497-02