61
INS
TALL
AT
O
RE
U
TENTE
MANU
TENT
O
RE
50
3.4 INDOOR UNIT HYDRAULIC DIAGRAM.
Key:
1 - Gas valve
2 - D.H.W. flow switch
3 - Gas nozzle
4 - Flow limiter
5 - DHW probe
6 - Condensate drain trap
7 - System filling valve
8 - DHW heat exchanger
9 - System expansion vessel
10 - Positive (+) pressure point
11 - Venturi
12 - Flow probe
13 - Ignition/detection electrodes
14 - Air intake pipe
15 - Flue probe
16 - Flue sample point
17 - Air sample point
18 - Burner
19 - Return probe
20 - Fan
21 - Air vent valve
22 - Boiler pump
23 - Absolute pressure switch
24 - 3-way valve (motorised)
25 - Bypass
26 - System draining valve
27 - 3 bar safety valve
28 - 3 bar safety valve drain fitting signal
29 - Air vent valve drain
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
SC - Condensate drain
M - System flow
R - System return
