Baxi Luna 3 Comfort Series Installation And Servicing Instructions page 8

.9.1 BoIler scHeMatIc For 1.310 Fi MoDel
operating Mode (Fig. 1.1)
1. With a demand for heating, the pump circulates water through the primary circuit. At a pre-determined flow rate the
central heating flow switch operates, initiating the ignition sequence.
. The main burner ignites at low rate, then the gas valve controls the gas rate to maintain the heating temperature mea-
sured by the temperature sensor.
3. When the flow temperature exceeds the setting temperature, a 3 minute delay occurs before the burner relights auto-
matically (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).
Key
1 Primary Heat Exchanger
2 Burner
3 Ignition Electrode
4 Flame Sensing Electrode
5 Gas Valve
6 Pump
7 Automatic Air Vent
8 Expansion Vessel
9 Boiler Drain Point
10 Pressure Relief Valve
11 Boiler Return
12 Gas Inlet
14 Automatic By-Pass
15 Three Way Valve
16 Manometer
17 Boiler Flow
18 Three Way Valve
19 Three Way Valve Motor
20 Safety Thermostat
21 Temperature Sensor
InstructIons pertaInInG to tHe Installer
Boiler primary circuit
Fig. 1.1
8
95.188.3 - GB