Burnham ES2 manual , Connect Electrical Wiring

7. Connect Electrical Wiring

DISCONNECT ELECTRICAL POWER to the boiler and heating system before

servicing. Positively assure that no voltage is present. Lock electrical boxes to prevent someone from inadvertently restoring power before the heating system is safe to operate.

NEVER DEFEAT OR JUMP OUT safety devices.

PROTECT EACH BOILER circuit with a properly sized over-current protection

device.

MAKE ELECTRICAL CONNECTIONS CAREFULLY according to the boiler’s

wiring diagram and instructions

Refer to the Internal Wiring diagrams later in this manual.

1.Locate the wiring box on the left side of the boiler and open the cover (Figure 7-a).

2.Install a 120V disconnect near the boiler.

3.Connect the 120V wiring from the disconnect to the boiler's white (neutral), black (hot), and green (ground) labeled "120VAC Power supply". Do not reverse polarity.

4.Connect the 120V wiring from the circulator to the white (neutral) yellow (hot) wires marked "circulator".

WIRE AN ADDITIONAL SAFETY LIMIT such as a low water cutoff or temperature

limit device, other than an IQ™ Control device, in series with the 120V circuit used to power the boiler. Do not alter the boiler’s factory wiring when adding an additional limit.

7-a
		
			1
1	2	3 T	T

7-b

5.Connect the 24V wiring from the thermostat to the "T-T" terminals on the Option Control

Panel.

6.To connect other external devices, refer to the instructions included with these devices.

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