X9
95
95
278
278
X7
GND
297
+15V
OUT
47
*72
114
16
Modulating fan
32
Heating circulating pump
42
DHW temperature sensor (see kit)
44
Gas valve
47
Modulation Regulator (24V)
*72
81
Ignition/detection electrode
114
Water pressure switch
138
Optional
*155 Optional Indirect Tank Sensor
(See parts list)
278
Double sensor (Safety + Heating)
297
Air pressure transducer
307
Heating system second Circulation pump
*370
EN
WIRING DIAGRAM
*155
*370
*138
138
M
1
2
3
4
5
6
X6
DBM34A
X7
81
1k
10
kOhm
1,8
kOhm
7
8
AUX
X2
X1
1
L
N
*Important:
• Before connecting the room thermostat, remove
jumper on terminal block. ( Key 72)
• Before connecting optional Indirect Tank Sensor,
remove two resistors. (Key 155)
• Before connecting the Low Water Cutoff, remove
the jumper on terminal block. (Key 370)
38
*138 - Optional Outdoor Sensor
*155 - Optional Indirect Tank Sensor
*370 - Field Source LWCO
120V
60Hz
N
L
1
N
L
X4
44
307 - Field source
X4
second CH pump
32
307
N
G L1
X11
NOTICE
16