Information about the appliance | 19
6 720 643 068 (2011/06)Copyright (optional information)
Key to Fig. 8:
1 Ignition transformer
2 Boiler high limit dial
3 120 VAC connection
4 External heating pump for unmixed heating circuit (secondary circuit)
1)
or DHW recirculation pump
1)
5 Fuse T 6.3 A (120 VAC)
6 DHW thermostat
7 External safety high limit or low water cut off (LWCO)
8 BUS connection, e.g. heating control
9 Room thermostat – dry contact
10 Outdoor temperature sensor
11 Code plug
12 Diagnostic interface
13 ON/OFF switch
15 Transformer
14 Gas valve
16 Fan
17 Flue gas temperature limiter
18 Supply temperature sensor
19 Flame rod electrode
20 Ignition electrode
21 Boiler block temperature limiter
22 DHW temperature sensor
23 Boiler circulator
24 3-way valve (Space heating/DHW heating)
25 Flow meter (turbine)
26 Additional supply temperature limiter
27 External system supply temperature sensor
1) Set the service function 5.E, Æ page 71
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