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-tempe 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.
¼
For 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.
¼
For 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 sy
s
tem temperatures.
4.5
Circulating pump (Available pump head)
The boiler is fitted with an on/off circulation pump.
1
Combi 24 - 28
2
Combi 35
H
Manometric height central heating circuit
Q
Water flow ( ΔT=20K)
R000684-A
1200
1000
600
800
400
200
0
0
100
200
300
400
500
600
Q (l/h)
1600
1400
700
H
(mbar)
1250
30 kW
317
1500
860
1030
20 kW
24 kW
253
127
1
2
4. Technical description
Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
16
02092014 - 7619497-02
