APPLIANCE INFORMATION
6 720 803 599 (2012/06) 7
Fig. 4 Hydraulics
Fig. 5 Control panel
The diagram opposite shows the controls in the servicing position
and excludes the outer case
1FLAME VIEWING WINDOW
2 IGNITION ELECTRODES AND FLAME SENSE ELECTRODE
3 HEAT EXCHANGER
4 OVERHEAT THERMOSTAT
5 ACCESS POINT FOR CLEANING HEAT EXCHANGER
6 PLATE TO PLATE DHW HEAT EXCHANGER
7 MODULATING PUMP
8 PRESSURE RELIEF VALVE
9 DRAIN POINT
10 DCW MAINS ISOLATING VALVE
11 CH RETURN ISOLATING VALVE
12 CHARGING LINK ASSEMBLY
13 COVER FOR EXTERNAL WIRING CONNECTIONS
14 CONTROL PANEL IN SERVICE POSITION
15 SYSTEM PRESSURE GAUGE
16 GAS ISOLATING VALVE
17 DHW OUTLET CONNECTION
18 CH FLOW ISOLATING VALVE
19 CONDENSATE DRAIN CONNECTION
20 CONDENSATE SIPHON
21 INLET PRESSURE TEST POINT
22 GAS VALVE
23 DHW TEMPERATURE SENSOR (NTC)
24 AIR / GAS - ADJUST MAXIMUM SETTING SCREW
25 FAN PRESSURE TEST POINT
26 FAN
27 PRIMARY SENSOR
28 EXPANSION VESSEL
29 REMOVABLE TOP CASE PANEL FOR SERVICING
Table 3 Main boiler components
6720647361-04.2Wo
30
7
31
6
33
9
39
35
36
37
38
40
41
8
42
42
32
34
30 FLOW TURBINE
31 UNUSED PORT
32 RETURN CONNECTION TO BOILER HEAT EXCHANGER
33 AUTO AIR VENT
34 EXPANSION VESSEL CONNECTION
35 FLOW CONNECTION FROM BOILER HEAT EXCHANGER
36 DHW SENSOR
37 CH FLOW CONNECTION TO PRE-PLUMBING MANIFOLD
38 DHW OUT CONNECTION TO PRE-PLUMBING MANIFOLD
39 DCW IN CONNECTION FROM PRE-PLUMBING MANIFOLD
40 CH RETURN CONNECTION FROM PRE-PLUMBING MANIFOLD
41 DIVERTER VALVE
42 COMPACT HYDRAULIC MOUNTING SCREW (2) TO BOILER
43 CH TEMPERATURE CONTROL
44 MAINS ON/OFF INDICATOR/DIAGNOSTIC LIGHT (BLUE)
45 DHW TEMPERATURE CONTROL
46 PERFORMANCE TEST BUTTON
47 SERVICE BUTTON
48 BURNER ON INDICATOR LIGHT (GREEN)
49 MASTER SWITCH ON/OFF
50 HOLIDAY BUTTON
51 ECO BUTTON
52 FAULT RESET BUTTON
53 DISPLAY
54 POSITION FOR OPTIONAL PLUG-IN CONTROL
Table 4 Hydraulics and control panel
6720647361-56.2Wo
49
48
47
46
43
44
15
54 53
52
51
50
45
1
2
3
4
5
6
max
2
3
1
04
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