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12
20
11
10
7
8
5
6
A
B
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
© Baxi Heating UK Ltd 2013
13
14
15
17
18
21
22
9
4
C
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
3.0 Appliance Operation
3.1
1. With a demand for heating, the pump circulates water
through the primary circuit.
2. Once main burner ignites the fan speed controls the gas
rate to maintain the heating temperature measured by the
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temperature sensor.
3. When the flow temperature exceeds the setting
temperature, a 3 minute delay occurs before the burner
relights automatically (anti-cycling). The pump continues to
run during this period.
4. When the demand is satisfied the burner is extinguished
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and the pump continues to run for a period of 3 minutes
(Pump Overrun).
3.2
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. When the boiler temperature falls below 5°C the boiler
will fire until a temperature of 30°C is reached.
3. Further protection can be incorporated by using a system
frost thermostat.
1
3.3
1. If the boiler has been inactive for a period of 24 hours the
pump will automatically operate for 1 minute to prevent
sticking.
2
3
D
Fig. 3
Operating Mode
Boiler Frost Protection Mode
.
Pump Protection
9
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