A.O. Smith BTR 120, Installation Operation & Maintenance

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TABLE OF CONTENTS

ROUGH-IN-DIMENSIONS ---------------------------------------- 2-3
TABLE OF CONTENTS ---------------------------------------------- 4
FOREWORD ----------------------------------------------------------- 4
GENERAL SAFETY INFORMATION ----------------------------- 5
Chemical Vapor Corrosion ------------------------------------------ 5
Improper Combustion ------------------------------------------------ 5
Liquid Petroleum Models -------------------------------------------- 5
Extended Non-Use Periods ----------------------------------------- 5
Insulation Blankets -------------------------------------------------- 5-6
High Altitude Installation --------------------------------------------- 6
FEATURES ------------------------------------------------------------- 6
The Eliminator (Self-Cleaning System) -------------------------- 6
High Limit Switch (E.C.O.) ---------------------------------------- 6-7
Electronic Ignition Control ------------------------------------------- 7
Automatic Flue Damper Device ----------------------------------- 7
Circulating Pump ------------------------------------------------------ 7
Dishwashing Machine Requirement ---------------------------- 7-8
INSTALLATION INSTRUCTIONS --------------------------------- 8
Uncrating ---------------------------------------------------------------- 8
Locating The Heater -------------------------------------------------- 8
Levelling ----------------------------------------------------------------- 8
Clearances ------------------------------------------------------------ 8-9
Installation on Combustible Flooring ----------------------------- 9
Hard Water -------------------------------------------------------------- 9
Air Requirements -------------------------------------------------- 9-10
  Unconfined Space --------------------------------------------------- 9
  Confined Space ----------------------------------------------------- 10
Vent Reducer ---------------------------------------------------------- 10
Venting ------------------------------------------------------------------ 10
Multiple Heater Manifold -------------------------------------------- 10
Water Line Connections -------------------------------------------- 10
Technical Data Venting ------------------------------------------ 11-12
Water (Potable) Heating and Space Heating ----------------- 13
Thermometers (Not Supplied) ------------------------------------ 13
Relief Valve ------------------------------------------------------------ 13
Gas Piping -------------------------------------------------------- 13-14
Gas piping and Dirt Leg Installation ------------------------ 14-15
Gas Pressure Regulator -------------------------------------------- 15

Grounding Instructions ---------------------------------------------- 15
Heater Wiring ---------------------------------------------------------- 15
INSTALLATION DIAGRAMS ---------------------------------- 15-21
MANIFOLDS ----------------------------------------------------------- 22
MECHANICAL VENTING ------------------------------------------- 23
Single Unit Installation ---------------------------------------------- 23
Vent Installation ------------------------------------------------------- 23
Multiple Unit Installation -------------------------------------------- 23
OPERATION ----------------------------------------------------------- 24
General ----------------------------------------------------------------- 24
Filling -------------------------------------------------------------------- 24
Purging ------------------------------------------------------------------ 24
Lighting and Operating Labels ------------------------------- 25-26
Water Temperature Control ---------------------------------------- 27
Testing Damper Control --------------------------------------------- 27
Checking Venting ------------------------------------------------ 27-28
PREVENTIVE MAINTENANCE ----------------------------------- 28
Check The Pilot ------------------------------------------------------- 28
Pilot Burner ------------------------------------------------------------ 28
Main Burner ------------------------------------------------------- 28-29
Gas Valves ------------------------------------------------------------- 29
Checking The Input -------------------------------------------------- 29
Venting System ------------------------------------------------------- 30
Remote Storage Tank Temperature Control ------------------- 30
Relief Valve ------------------------------------------------------------ 30
Hot Water Odor ------------------------------------------------------- 30
Anode Rod Inspection ---------------------------------------------- 30
Recommended Procedure For Periodic Removal
of Lime Deposits From Tank Type Commercial
Water Heaters ---------------------------------------------------- 30-31
Deliming Solvents ---------------------------------------------------- 31
Tank Cleanout Procedures ------------------------------------ 31-32
Troubleshooting Ignition Module System ---------------------- 32
SERVICE --------------------------------------------------------------- 32
Electrical Servicing --------------------------------------------------- 32
Replacement Parts --------------------------------------------------- 32
Effikal Flue Damper Troubleshooting Guide ------------------ 33
Operational Checklist ----------------------------------------------- 34
Limited Warranty ----------------------------------------------------- 35

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FOREWORD

These designs comply with ANSI Z21.10.3/CSA 4.3 as an
automatic circulating or automatic storage tank type water heater.

Heaters having an input of 305,000 (89 Kwh), 365,000 (107 Kwh),
399,000 (117 Kwh) and 500,000 (147 Kwh) Btuh with a recovery
rating of 277.3 gph (1049 Lph) or more also comply with ANSI
Z21.10.3 as an automatic instantaneous type heater.

Detailed installation diagrams are found in this manual.  These
diagrams will serve to provide the installer with a reference for
the materials and methods of piping necessary.  It is highly
essential that all water, gas piping and wiring be installed as shown
on the diagrams.

Particular attention should be given to the installation of
thermometers at the locations indicated on the diagrams as
these are necessary for checking the proper functioning of the
heater.

This model water heater is designed and manufactured in both
natural gas and propane versions. MAKE SURE the gas on which

the heater will operate is the same as that specified on the heater
model and rating plate.

These heaters may be installed on combustible floors.

In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations in force in the
local area where the installation is to be made.  These shall be
carefully followed in all cases.  Authorities having jurisdiction
should be consulted before installations are made.

The installation must conform to these instructions and the local
code authority having jurisdiction.  In the absence of local codes,
the installation must comply with the latest editions of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electrical
Code, NFPA 70 or CAN/CSA B149.1-00, and CSA 2 C22.1.  The
former is available from the Canadian Standards Association, 8501
East Pleasant Valley Road, Cleveland, OH 44131, and both
documents are available from the National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.