Dunkirk DWB Series User Manual download pdf (Page 3)







278

1 4

120V

60Hz

138

56783412





















GND

+15V

OUT





AUX

X11

LLNN



kOhm

1,8

kOhm

*138 - Optional Outdoor Sensor

*155 - Optional Indirect Tank Sensor

*370 - Field Source LWCO

Key

16 Modulating fan

32 Heating circulating pump

42 DHW temperature sensor (see kit)

44 Gas valve

47 Modulation Regulator (24V)

*72 Room thermostat (eld sourced)

81 Ignition/detection electrode

114 Water pressure switch

*138 Optional Outdoor Sensor (eld sourced)

*155 Optional Indirect Tank Sensor

(See parts list)

278 Double sensor (Safety + Heating)

297 Air pressure transducer

*370 Low Water Cutoff (LWCO) - (eld sourced)

NOTICE

*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)

Figure 4 - Wiring Diagram

Remove both resistors.

Wire sensor to 7 and 8.

DOMESTIC HOT WATER SENSOR KIT

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Dunkirk DWB Series User Manual Page 3

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