Dunkirk DWB Series User Manual

Page 23

8 - ELECTRICAL CONNECTIONS

8.1 General

Electrically bond boiler to ground in accordance with

requirements of authority having jurisdiction. Refer to:

• USA- National Electrical Code, ANSI/NFPA 70.
• Canada - Canadian Electrical Code, Part I, CSA C22.1:

Safety Standard for Electrical Installations.

8.2 Line Voltage Connections - Boiler

Provide individual 120V, 15 amp circuit (recommended)

with fused disconnect or service switch as required by

authority having jurisdiction.

WARNING

Electrical shock hazard. Turn OFF electrical power

supply at service panel before making electrical

connections. Failure to do so could result in death

or serious injury.

8.3 Central Heating Thermostat

A. Use thermostat or boiler system control with

dry contacts rated 0.5 amps @ 120 VAC.

Boiler

control does not provide 24 VAC power to central

heating thermostat. Do not use to power 24VAC

thermostat.

B. Locate and install thermostat per manufacturer's

instructions. Maximum wire length is

330 ft (100m)

for 22 ga. wire.

C. Connect wires to terminals 1 and 2 as shown in

fi gure 17. Wires are interchangeable.

Figure 16 - Terminal Block

- Thermostat or dry contacts

- 138 = Optional External Outdoor Reset Sensor

370 = Low Water Cutoff (LWCO) - fi eld source

Connections on 1 & 2 terminals are 120 Volts A/C.

Connections on 3 & 4 are dry contact only.