ECR International CHB Application Manual page 40

Figure 4 - Wiring Diagram
If Key 155 is
used remove
both resistors
and wire Indirect
Tank Sensor to
termimals 7 and 8.
95
95
278
278
297
*
72
114
Key
Important: Before connecting the room thermostat, remove the jumper on terminal block.
16
Modulating fan
Key
32 Heating circulating pump
16 Modulating fan
42 DHW temperature sensor (see kit)
32
Heating circulating pump
42 DHW temperature sensor (see kit)
44
Gas valve
44 Gas valve
47
Modulation Regulator (24V)
47
Modulation Regulator (24V)
72 Room thermostat (field sourced)
81 Ignition/detection electrode
*72 Room thermostat (field sourced)
114 Water pressure switch
81 Ignition/detection electrode
138 External probe (not fitted)
114 Water pressure switch
*138 Optional Outdoor Sensor (field sourced)
*155 Optional Indirect Tank Sensor
(See parts list)
278 Double sensor (Safety + Heating)
297 Air pressure transducer
*307 CH Sysetm Pump - (if applicable)
*370 Low Water Cutoff (LWCO) - (field sourced)
DOMESTIC HOT WATER SENSOR KIT
WIRING DIAGRAM
*
370
138
138
*
M
1 2 3 4 5
X9
X6
X7
DBM34
GND
+15V
OUT
47
X7
* *138 - Optional Outdoor Sensor
155
10
kOhm
*155 - Optional Indirect Tank Sensor
*307 - CH System Pump (if used)
1,8
*370 - Field Source LWCO
kOhm
6 7 8
AUX
X2 X1
1
L N N
81
1k
155 Hot water tank temperature probe (field sourced)
278 Double sensor (safety + Heating)
297 Air pressure transducer
307 Heating system second circulating pump (not supplied)
370 Low Water Cutoff (LWCO) - (field sourced)
*Important:
37
• 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)
40
138 Optional Outdoor Sensor
155 Optional Indirect Tank Sensor
370 Field Source LWCO
120V
60Hz
N L
1
L
X4
44
16
X4
32 307
N G L1
X11
NOTICE
P/N 240010745 Rev. D [08/31/2015]
EN