GAS-FIRED Commercial

COPPER BOILERS

FOR HYDRONIC HEATING

AND HOT WATER SUPPLY

USER'S INFORMATION MANUAL

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

•Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

•Extinguish any open flame.

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediately call your gas

supplier from a neighbor's phone. Follow the gas supplier's instructions.

•If you cannot reach your gas supplier, call the fire department.

•Installation and service must be

performed by a qualified installer, service agency or the gas supplier.

WARNING

Should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the electrical supply to the pump. Instead, shut off the gas supply at a location external to the appliance.

WARNING

Do not use this boiler if any part has been under water. Immediately call a qualified service technician to inspect the boiler and to replace any part of the control system and any gas control which has been under water.

GB/GW-200, -300, -400, -500, -650, -750

SERIES 200, 201, 202, 203

LIGHTING INSTRUCTIONS

These models have an automatic hot surface ignition system mounted on the combustion chamber panel inside the front jacket. This hot surface igniter ignites the main burner gas whenever the system control calls for heat.

Before proceeding with operation of the unit, make sure the boiler and system are filled with water and all air is expelled from the boiler, radiator tank(s) and piping.

WARNING

THE MAIN MANUAL GAS SHUT-OFF VALVE MUST HAVE BEEN CLOSED FOR AT LEAST FIVE (5) MINUTES BEFORE LIGHTING. This waiting period is an important safety step. Its purpose is to permit gas that might have accumulated in the combustion chamber to clear. IF YOU DETECT GAS AT THE END OF THE PERIOD DO NOT PROCEED WITH LIGHTING. RECOGNIZE THAT GAS ODOR, EVEN IF IT SEEMS WEAK, MAY INDICATE PRESENCE OF ACCUMULATED GAS SOMEPLACE IN THE AREA WITH A RISK OF FIRE OR EXPLOSION.

WARNING

THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS GAS WATER BOILERS IN ROOMS, GARAGES OR OTHER AREAS WHERE GASOLINE AND OTHER FLAMMABLE LIQUIDS ARE USED OR STORED, OR ENGINE-DRIVEN EQUIPMENT OR VEHICLES ARE STORED, OPERATED OR REPAIRED. FLAMMABLE VAPORS ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE IGNITED BY THE BOILER'S MAIN BURNER FLAMES CAUSING FIRE OR EXPLOSION. Some local codes permit operation of gas appliances if installed 18 inches or more above the floor. This may reduce the risk if location in such an area cannot be avoided.

INDEX	PAGE
GENERAL	1
LIGHTING INSTRUCTIONS	2 - 3
OPERATING SEQUENCE,
IGNITION CONTROL AND DIA-SCAN II
INSTRUCTIONS	4 - 8
MAINTENANCE	8
CONNECTION DIAGRAM	9
WARRANTY	10

A DIVISION OF A.O. SMITH CORPORATION

EL PASO, TX MC BEE, SC RENTON, WA

STRATFORD, ONTARIO

VELDHOVEN, THE NETHERLANDS

www.hotwater.com

	PLEASEKEEPTHESEINSTRUCTIONSADJACENTTOBOILERAND
PRINTED IN U.S.A. 2527 300	NOTIFYOWNERTOKEEPFORFUTUREREFERENCE.	PART NO. 210890-000 REV. 1
		SUPERSEDES PART NO. 210311-000

GB/GW-500, GB/GW-650, GB/GW-750, GB/GW-400, GB/GW-200 specifications

A.O. Smith is a renowned name in the water heating industry, offering a wide range of products that cater to various residential and commercial needs. Among their standout offerings are the GB/GW-200, GB/GW-400, GB/GW-650, GB/GW-750, and GB/GW-500 models. Each model is designed with advanced technologies, ensuring optimal performance, energy efficiency, and reliability.

The GB/GW-200 model, with a capacity of 200 liters, is ideal for small to medium-sized households. It features a high-efficiency gas burner and an advanced electronic control system that ensures accurate temperature regulation. The unit also comes equipped with a glass-lined tank for enhanced durability and resistance against corrosion, extending its lifespan significantly.

Moving up in capacity, the GB/GW-400 model offers 400 liters of hot water storage, making it a preferred choice for medium to large households or small businesses. One of its key features is the multiple safety systems integrated into its design, including flame failure protection and temperature control features, making it both safe and reliable. Additionally, this model is equipped with a user-friendly digital display that allows for easy monitoring and adjustments.

The GB/GW-500 model takes it a step further with a capacity of 500 liters. Designed for larger applications, including commercial settings, it integrates A.O. Smith’s innovative heating technology for rapid recovery rates. This model stands out with its focus on energy efficiency, having an impressive Energy Factor rating that significantly reduces operational costs.

The GB/GW-650 and GB/GW-750 models cater to even larger needs, featuring capacities of 650 and 750 liters respectively. Both models are engineered with high-output burners, ensuring quick heating even during peak demand periods. Advanced insulation materials are used, enhancing thermal efficiency and minimizing heat loss, which translates to significant energy savings over time.

All these models feature A.O. Smith’s proprietary tankless technology, which allows for continuous hot water supply without the need for a large storage tank. This innovation not only saves space but also addresses the ever-increasing demands for hot water in modern households and businesses.

In conclusion, the A.O. Smith GB/GW series—GB/GW-200, GB/GW-400, GB/GW-500, GB/GW-650, and GB/GW-750—delivers reliable, energy-efficient water heating solutions suited for a variety of applications. With advanced safety features, user-friendly controls, and high energy efficiency ratings, these models are built to meet the demands of any modern water heating application, ensuring customer satisfaction and peace of mind.