3 Mode of operation – Overview
17
HDG C
OMPACT
25/35
BACK
SIDE
1 Connection of immersion sleeve for thermal safety device (DN 15,
inside thread)
2 Safety heat exchanger connections (DN 15, outside thread)
3 Drive module
4 Expansion module EM4 (optional)
5 Actuator primary air
6 Actuator secondary air
7 Ash removal motor
8 Grate tilting motor
9 Boiler return connection (DN 32 IG)
10 Filling/draining connection (DN 15 IG)
11 Ignition fan
12 Central module
13 Lambda sensor
14 STL release button
15 Boiler supply connection (DN 32 IG)
16 Main switch
Figure 3/2 - HDG Compact 25/35 boiler back side
8
7
5
4
3
2
1
9
11
12
13
16
15
6
10
14