3 Mode of operation – Overview
19
HDG C
OMPACT
45/50/65/80
BACK
SIDE
1 Boiler return connection (DN 32 IG and DN 40 IG)
2 Immersion sensor connection for thermal safety device
3 Safety heat exchanger connections
4 Central module
5 Drive module
6 Expansion module EM4 (optional)
7 Combustion air fan
8 Actuator primary air
9 Ash removal motor
10 Grate tilting motor
11 Ignition fan
12 Actuator, secondary air
13 Boiler return connection (DN 32 IG and DN 40 IG)
14 STL release button
15 Main switch
16 Filling/draining connection (DN 15 IG)
Figure 3/4 - HDG Compact 45/50/65/80 boiler back side
1
8
7
4
2
5
16
3
6
15
13
10
11
12
14
9