Bunn U3A service manual Electrical Requirements, Electrical Installation Instructions

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.

L2 RED
WHITE	120V A.C.
	208 OR
NEUTRAL	240V A.C.
	120V A.C.
L1 BLACK

P1841

RED

L2

BLUE

L3

BLACK

L1

GREEN

208V OR 240V

380V OR 440V

208V OR 240V 380V OR 440V

208V OR 240V

380V OR 440V

GREEN

P1843

U3 & U38 requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, U3-30 amp,U38-40 amp, single phase, 60 Hz. Proceed as follows:

U333 & U3833 requires 3-wire, grounded service rated 240 volt ac, 35 amp or 440 volts ac, 30 amp for U333,three phase, 60 Hz or 380 volts ac, 30 amp for U3833, three phase, 50 Hz. Proceed as follows:

BLACK L1
RED	230V A.C.
L2

GREEN GREEN

P1842

WHITE

(NEUTRAL) N

RED L2 BLUE L3 BLACK L1

GREEN

		L1, L2, L3, are the 3 phases
		V1 = Phase to phase voltage,
		between any 2 phases.
		V2 = Phase to neutral voltage,
		any phase to neutral.
	GREEN
		SYSTEM
		VOLTAGE	V1	V2
P1844		208	208	120
		240	240	139
		380	380	220
		440	440	254

U3A models require 2-wire, grounded service rated 230 volts ac, 30 amp, single phase, 50 Hz. Proceed as follows:

U3833 requires 4-wire, grounded service rated

380 volts ac or 440 volts ac, 30 amp, three phase, 50 Hz. Proceed as follows:

ELECTRICAL INSTALLATION INSTRUCTIONS

NOTE: Electrical source should have a circuit breaker between the brewer and the main supply which breaks all poles with a contact separation of at least 3 mm.

CAUTION – Improper electrical installation will damage electronic components.

1.An electrician must provide electrical service as specified.

2.Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3.Before electrically connecting the brewer, remove the front cupola cover (some models have the thermostat knob on the outside of the cover) and rotate the thermostat knob fully counterclockwise to the "OFF" position. Keep this knob in the "OFF" position until performing the Initial Setup.

4.Electrical service is connected at the upper rear of the single service and scrambler brewers using a junc- tion box. On double service brewers the rear decorative channel must be removed for access to the terminal block.

5.Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Re- place all panels.

6.If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing has been hooked up, the brewer is ready for Initial Setup.

NOTE: Schematic wiring diagrams are included in this manual.

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