Bunn U3 Service Manual

U3
U3A
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
10060.0000K 10/08 ©1984 Bunn-O-Matic Corporation

Bunn U3 Specifications

General

Category	Coffee Maker
Manufacturer	Bunn
Model	U3
Brewing Capacity	3 gallons per hour
Capacity	3 gallons
Water Source	Plumbed
Voltage	120V
Material	Stainless Steel
Weight	20 lbs
Features	Automatic
Tank Type	Stainless Steel
Warranty	1 Year Limited
Type	Commercial

Summary

Commercial Product Warranty

Electrical Requirements

Plumbing Requirements

Initial Setup

Adjusting Brew Volumes

Coffee Brewing

Cleaning

Troubleshooting

Brew Cycle Will Not Start

Diagnoses and resolves issues preventing the brew cycle from initiating.

Tank Not Filling

Identifies causes and solutions for the brewer's tank not filling with water.

Water Running Out of Overflow

Addresses problems causing water to leak from the overflow spout.

Water Not Hot

Explains how to fix issues where the water is not reaching the correct temperature.

Circuit Breaker Keeps Tripping

Troubleshoots persistent tripping of the circuit breaker.

Funnels Overflow

Resolves problems related to coffee grounds overflowing the brew funnels.

Coffee Reservoir Overflows

Fixes issues causing the coffee reservoir to overflow.

Brewer Making Unusual Noises

Identifies and resolves abnormal noises produced by the brewer.

Service

Circuit Breaker

Contactor

Control Thermostat

Limit Thermostat

Liquid Level Board and Level Probe

Pump Assembly

Relay

Solenoid

Start Switch

Tank Heaters

Schematic Wiring Diagrams