A.O. Smith BTPN, COF, COBT Maintenance, Flushing, Draining, Sediment Removal, Lime Scale Removal

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3.The correct test instruments are:

•CO2 indicator or 02 analyzer

•CO indicator

•Stack thermometer

•Draft gauge or inclined manometer

•U-tube manometer or calibrated 0-10” and 0-35” w.c. pressure gauge

•Combination volt/ammeter.

Suggested safety device test procedures are:

A. While heater is operating, turn valve, main burner and pilot gas line manual gas cocks to the OFF position. Burner should shutdown within 3-4 seconds and lockout on flame failure, requiring reset of the flame safeguard device.

B. While heater is operating, lower the setting of each of (2) operating thermostats (one at a time). During this setting change, the burner should shutdown when the called for temperature is less than the temperature indicated on the thermometer. Restore the settings to original values and burner should restart.

Should any of the above operating test fail, replace the involved component.

MAINTENANCE

GENERAL

Water heater maintenance includes periodic tank flushing and cleaning, and removal of lime scale. The power burner should be inspected and adjusted to maintain proper combustion. Refer to the following table. A periodic inspection of the venting system should be made. Where used, the water heating system circulating pump should be oiled.

KEEP APPLIANCE AREA CLEAR AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS.

FLUSHING

1.Turn off the heater electrical disconnect switch.

•For convenience, the switch on the outside of the control compartment can be used.

2.Open the drain valve and allow water to flow until it runs clean.

3.Close the drain valve when finished flushing.

4.Turn on the heater electrical disconnect switch.

 

MAINTENANCE SCHEDULE

 

Component

Operation

Interval

Required

 

Flushing

Monthly

 

 

Sediment

 

 

Tank

Removal

Semi-Annually

 

 

Lime Scale

 

UN•LIME®

 

Removal

As Required

Delimer

Relief Valve

Inspect

Semi-Annually

 

Power Burner

 

 

SAE No. 20

Motor(1)

Inspect

Quarterly

non-detergent

 

 

 

motor oil

Power Burner

 

 

Combustion

and Ignition

Inspection

Semi-Annually

test kit &

Device(2)

 

 

test

 

 

 

specifications

Main Burner

Check Flame

Annually

 

Flue Baffle

 

 

 

Pipe(3)

Cleaning

As Required

Wire Brush

Vent System

 

 

 

and Barometric

Inspect

Semi-Annually

Draft Gauge

Damper

 

 

 

(1)If furnished with oiling provisions

(2)If flange gasket is damaged, it must be repaired.

(3)COF and COBT Only.

DRAINING

The heater must be drained if it is to be shut down or exposed to freezing temperatures. Maintenance and service procedures may also require draining the heater.

1.Tun off the heater electrical disconnect switch.

2.Close the cold water inlet valve to heater.

3.Open a nearby hot water faucet to vent the system.

4.Open the heater drain valve.

5.If the heater is being drained for an extended shutdown, it is suggested the drain valve be left open during this period.

• Follow FILLING instructions when restoring hot water service

SEDIMENT REMOVAL

Waterborne impurities consist of fine particles of soil and sand which settle out and form a layer of sediment on the bottom of the tank.

For convenience, sediment removal and lime scale removal should be performed at the same time.

LIME SCALE REMOVAL

The amount of calcium (lime) released from water is indirect proportion to water temperature and usage. The higher the water temperature or water usage, the more lime deposits are dropped out of the water. This is the lime scale which forms in pipes, heaters and on cooking utensils.

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Contents Asme Table of Contents ForewordIdentification General Safety Information Features Installation InstructionsWater Temperature Control Required AbilityLocating the Heater LevelingClearances AIR RequirementsVent Connector Barometric Draft Control AssemblyThermal Expansion Closed System VentingWater Line Connections Relief ValveGAS Piping Wiring PurgingGAS Meter Size City Gases only GAS Pressure RegulatorTypical Wire Diagram Typical Wire Diagram COBT, 140 300 Kbtuh COF, 140 720 KbtuhTWO Unit Manifold Installation OperationGeneral FillingMaintenance FlushingDraining Sediment RemovalPower Burner Troubleshooting Cleaning FLUES-COF & Cobt onlyVent Systems Barometric Draft ControlReplacement Parts Water Heater Makes NoiseWater Leakage is Suspected Model BTP/BTPD/BTPN/COF/COBT Limited Warranty

BTP-140-140, BTPN, BTP-140-140 thru 600-2500, COF, COBT specifications

A.O. Smith, a renowned leader in water heating technology, offers a range of high-efficiency commercial boilers, including the COBT, BTP-140-140 through BTP-600-2500, BTPN, and COF models. Designed to cater to diverse heating needs, these systems are engineered for optimal performance, reliability, and efficiency, making them ideal for various applications, from hospitality to industrial processes.

The A.O. Smith COBT model stands out for its innovative features, such as a fully modulating burner that adjusts output based on demand, enhancing energy efficiency and ensuring consistent comfort. Its compact design allows for easy installation in limited spaces, while robust construction materials ensure longevity. The integrated controls offer real-time monitoring and diagnostics, allowing operators to maintain peak performance and reduce maintenance costs.

The BTP series, particularly the BTP-140-140 through BTP-600-2500, delivers high heating capabilities with a range of output options. These models feature a sophisticated heat exchanger design that maximizes heat transfer efficiency while minimizing energy consumption. The use of dual-fuel capability provides flexibility, allowing users to switch between natural gas and propane, thus enhancing operational resilience. The BTP units are also equipped with advanced modulating burners that adapt to varying load conditions, further optimizing fuel usage.

For applications requiring enhanced performance, the BTPN models offer additional features like integrated pumps and a larger footprint for increased capacity. This makes them ideally suited for high-demand environments where consistent hot water supply is critical. The COF model complements this lineup, focusing on oil-fired applications and delivering reliability across diverse operating conditions.

In terms of technology, A.O. Smith utilizes cutting-edge combustion systems and advanced control technologies that not only enhance efficiency but also meet stringent emission standards. The incorporation of condensing technology in many models enables users to harness latent heat from flue gases, significantly improving overall system efficiency.

Overall, A.O. Smith's COBT, BTP, BTPN, and COF models are engineered with a commitment to quality, efficiency, and user-friendliness. Their reliability, advanced technologies, and versatile applications make them a preferred choice for businesses looking for durable and efficient heating solutions. Whether for commercial or industrial needs, A.O. Smith continues to set the standard for water heating systems.
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