A.O. Smith Cyclone Xi - User Manual

Commercial Gas
High Efficiency Water Heaters
Cyclone Xi
M O D E L S C O V E R E D
BTH 120 thru 500 Models
Series 100 and 101
Part No. TC-100
Service Handbook
Part No. 316586-000 • Printed in the U.S.A. • 0509
©2007 A. O. Smith Corporation
COMMERCIAL
Visit the “Information Central” link of
www.hotwater.com for a listing of
available Service Handbooks.
For additional information contact:
A. O. Smith Water Products Company
A Division of A. O. Smith Corporation
500 Tennessee Waltz Parkway
Ashland City, TN 37015
1-800-527-1953
www.hotwater.com

Summary

Introduction and Qualifications

Service Qualifications

Defines a "Qualified Agency" as an experienced individual or firm for installation and servicing.

Tools Required for Service

General Information and Specifications

Gas Pressure Specifications

Details nominal, minimum, and manifold gas supply pressures for different models.

Installation Quick Tips: BTH 120 & 150 Gas Pressure

Adjustment Procedure: Gas Pressure BTH 120;150

Step-by-step guide to adjust gas pressure for BTH 120 and 150 models.

Installation Quick Tips: BTH 199 & 250 Gas Pressure

Adjustment Procedure: Gas Pressure BTH 199;250

Explains that BTH 199/250 models self-adjust gas pressure; no manual adjustment needed.

Installation Quick Tips: BTH 300,400,500 Gas Pressure

Adjustment Procedure: Gas Pressure BTH 300;400;500

Step-by-step guide to adjust gas pressure for BTH 300,400,500 models.

Installation: Venting Category and Materials

Cyclone Venting Category IV

Type Venting Options

Concentric Venting Kits

Venting Tables and Specifications

Venting Tables BTH 120-250

Details maximum equivalent vent pipe lengths for 3" and 4" PVC for BTH 120-250 models.

Venting Tables BTH 300,400,500

Details maximum equivalent vent pipe lengths for 4" PVC for BTH 300,400,500 models.

Venting Diagrams: Single Pipe Power Vent

Venting Diagrams: Two Pipe Direct Vent

Control Overview and Status Icons

Adjusting Tank Temperature and Settings

Fault and Warning Conditions

Accessing Fault and Warning Details

Fault Codes and Error Listing

Viewing Fault History and Heater Information

Control Sequence Operation

Control Sequence Flow Chart

Central Control Board (CCB) Overview

Gas Valve BTH 199 & 250 Operation

Pressure Switches Functionality

Blower Proving Switch

Blocked Outlet Proving Switch

Blocked Inlet Proving Switch

Low Gas Pressure Switch

Pressure Switch Specifications BTH 120-250

Pressure Switch Specifications BTH 300,400,500

Igniter, Flame Sensor, and Powered Anodes

Hot Surface Igniter, Flame Sensor, and Control Timing

Blower Speed Control BTH 199;250

Variable Frequency Drive (VFD) BTH 400;500

VFD Blower Speed and Pressure Readings

Wiring Diagram BTH 120-300

Wiring Diagram BTH 400-500

A.O. Smith Cyclone Xi Specifications

General

Category	Water Heater
Brand	A.O. Smith
Model	Cyclone Xi
Fuel Type	Natural Gas
BTU Input Range	120, 000 - 500, 000 BTU/hr
Thermal Efficiency	Up to 96%
Vent Type	Power Vent
Voltage	120V
Frequency	60 Hz
Weight	Varies by model
Dimensions	Varies by model
Recovery Rate	Varies by model
Type	Gas Water Heater
Tank Material	Glass Lined
Capacity	50 - 100 gallons
Power Consumption	Varies by model (see product literature)
Heating Element	Gas Burner
Warranty	3 years limited