Operating Principle; Central Heating Mode; Boiler Frost Protection Mode; Pump Protection - Baxi EcoBlue System 12 Installation And Service Manual

4 Description of the Product
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20
11
10
7
8
5
6
4
A
B
Boiler Schematic
Layout
Key
1. Pump with Automatic Air Vent
2. CH System Pressure Gauge
3. Central Heating Filter
4. Non-return valve
5. Hydraulic Pressure Sensor
6. Boiler Drain Tap
7. Pressure Relief Valve
8. Condensate Trap
9. Gas Valve
10. Safety Thermostat (105°C)
11. Heating Flow Sensor
Connections:-
A – Condensate Drain
B – Heating Flow
C – Gas Inlet
D – Heating Return
20 EcoBlue System
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14
15
16
17
18
21
22
9
3
C D
12. Flue Sensor
13. Boiler Adaptor
14. Primary Heat Exchanger
15. Spark Ignition Electrode
16. Burner
17. Flame Sensing Electrode
18. Air/Gas Collector
19. Heating Return Sensor
20. Fan
21. Air-Gas Venturi
22. Expansion Vessel
4.2

Operating Principle

To operate the boiler must be set so that the
is displayed. Press the
N.B. If only is displayed the boiler will not operate !
4.2.1

Central Heating Mode

1. With a demand for heating, the pump circulates water through
the primary circuit.
2. Once the burner ignites the fan speed controls the gas rate to
maintain the heating temperature measured by the temperature
sensor.
3. When the flow temperature exceeds the setting temperature,
a 3 minute delay occurs before the burner relights automatically
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(anti-cycling). The pump continues to run during this period.
4. When the demand is satisfied the burner is extinguished and
the pump continues to run for a period of 3 minutes (pump
overrun).
4.2.2

Boiler Frost Protection Mode

1. The frost protection mode is integral to the appliance and
functions as long as there is power to the boiler, as indicated by
the standby signal
2. With the boiler in 'On' mode and when the boiler temperature
falls below 5°C the boiler will fire until a temperature of 30°C is
reached.
1
3. Further protection can be incorporated by using a system
frost thermostat.
4.2.3

Pump Protection

2
1. This activates once a week if there has been no demand. The
pump runs for 30 seconds to prevent sticking.
button to display the symbol.
.
7219708 - 01 (04/15)
symbol