Other troubleshooting hints:

1.Input switches can be easily checked by observing their activation on the UIM System Status screen. Force the boiler to remain in the Standby mode by opening the Thermostat input or by setting the operating setpoint to the minimum so that the system does not request heat. Then short out the contacts on the switch and verify that an asterisk "*" appears next to the appropriate input on the screen. If it does not then look for the problem to be in the wiring or connectors between the flow switch and the CCB.

2.When troubleshooting a particular problem the heating sequence time can be shortened by turning off the dipswitches for operation devices that are not needed during troubleshooting.

3The pump can be activated during the "Standby" mode by changing the post-circulate time to continuous.

4.All Hi-Speed blowers can be activated for 5 minutes by opening any Hi-Speed blower prover switch prior to turning on the power. This activates the "shutter adjust" mode. During this time, activation of all of the blower prover switches can be checked on the "system status" screen.

5.Opening the Thermostat input leads will force the system to remain in the standby mode.

6.Running the system with the gas turned off will allow the system to run through all operating steps up to flame sensing.

7.Proper operation of the flame sensing circuit can be almost completely verified through the use of a 14007 diode. The anode end of the diode should be connected to the appropriate flame sense lead and the cathode end (bar) of the diode should be connected to the case of the boiler (earth ground connection). Gas is not needed for this procedure and therefore should be off. It is also desirable to disable the command for heat by opening the thermostat leads. After apply power the system should declare an error because flame is being sensed at the wrong time. Shift to the "System Status" screen and scroll down to the appropriate "Flame" input. The asterisk "*" should appear when the diode is connected and not when it is disconnected.

8.The CCB can be individually checked out by setting the 10 position CCB dipswitch to off. This will make the system operate as a single stage and disable the other FCB's.

9.Watching the Control States screen while troubleshooting the heating sequence will help determine what is causing the problem. Knowing what state the CCB and FCB's are in when the problem occurs will help to pinpoint a possible source of the fault.

10.Write down the proper positions of the dip switches after initial installation and compare them to the present dipswitch setting shown on the "Configuration Settings" screen. This will catch any accidental changing of the dipswitches.

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A.O. Smith 650, GB/GW-300, 500, 750 SERIES warranty Other troubleshooting hints
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500, 750 SERIES, 650, GB/GW-300 specifications

The A.O. Smith GB/GW-300, 650, 750 Series, and 500 represent a cutting-edge line of commercial water heaters designed to meet the diverse needs of various applications. These models are highly regarded for their advanced features, robust construction, and reliable performance, making them ideal for businesses such as restaurants, hotels, and industrial facilities.

One of the main features of the A.O. Smith GB/GW series is its high-efficiency design. These water heaters are built with advanced insulation and heat exchanger technology, which contribute to reduced energy consumption and lower operating costs. The products achieve notable energy efficiency ratings, ensuring that businesses can maintain their hot water supply without incurring excessive utility bills.

The GB/GW series also incorporates a user-friendly digital control system. This technology allows operators to monitor and adjust settings easily, providing real-time feedback on temperature and energy consumption. This level of control enhances operational efficiency and ensures hot water is always available when needed.

Another significant characteristic of the A.O. Smith GB/GW series is its durable construction. The units are designed with high-quality materials that resist corrosion and wear, extending their operational lifespan. The stainless steel tanks and heat exchangers are engineered to withstand high temperatures and pressure, making them reliable even in demanding environments.

Moreover, safety features are paramount in the design of these water heaters. The series includes multiple safety mechanisms, such as high-temperature limit switches and pressure relief valves, ensuring the safe operation of the unit at all times. This not only protects the equipment but also guarantees the safety of personnel using hot water.

The GB/GW series ranges in capacity, accommodating different sizes of operations. From the compact and efficient 300 model to the larger 650 and 750 units, the series offers flexibility to suit various demands. The 500 model strikes a balance between capacity and efficiency, making it a popular choice for medium-sized establishments.

In summary, the A.O. Smith GB/GW-300, 650, 750 Series, and 500 are exemplary choices for commercial water heating solutions. Their combination of efficiency, advanced technology, durable design, and comprehensive safety features ensures that businesses have access to reliable hot water, ultimately supporting their operational needs and enhancing service delivery.
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