Operating Setpoint | A.O. Smith 500, GB/GW-300, 750 SERIES, 650

•User Settings Screen:

Each setpoint or user setting has either a limited selection of values, or a limited range of values. The Up/Down keys are used to change values. After changing an item, the Select key is pressed to accept the change, or the Menu key is pressed to reject the change and restore the item to its original value. The following setpoints can be changed:

Operating Setpoint:

This setpoint sets the base temperature for the control algorithm.

OPERATING SETPOINT ADJUSTMENT PROCEDURE

The system has a standard programmable Operating Setpoint range of 70 Degrees F to 190 Degrees F for a GW and of 70 Degrees F to 220 Degrees F for a GB. The user can easily change the Operating Setpoint at any time by using the following procedure. When any configuration or setpoint is changed (and the Select key touched), the new value is IMMEDIATELY saved to non-volatile memory.

1.Touch the MENU key.

2.Scroll the ">" with the DOWN key next to the USER SETTING SCREEN.

3.Touch the SELECT key.

4.Scroll the ">" with the DOWN key until it is pointing to

OPERATING SETPOINT.

5.Touch the SELECT key.

6.Use the UP or DOWN key to select the value you wish to enter.

7.Touch the SELECT key to accept and store the new value.

•High Limit:

The outlet temperature probe contains both an ECO switch and a thermistor for temperature measurement. The sensed outlet temperature is used for the automatically resettable High Limit setpoint. If the sensed outlet temperature exceeds the High Limit setpoint, a "soft lockout" condition will occur and the burner will be shut off. This fault condition is automatically cleared when the temperature drops below the high limit setpoint minus the high limit differential.

HIGH LIMIT SETPOINT ADJUSTMENT PROCEDURE

The High Limit setpoint has a range of 90 Degrees F to 210 Degrees F for a GW and a range of 90 Degrees to 235 Degrees F for a GB. Use the following procedure to change the automatically resettable High Limit Setpoint:

1.Touch the MENU key.

2.Scroll the">"with the DOWN key next to USER SETTING SCREEN.

3.Touch the SELECT key.

4.Scroll the ">" with the DOWN key until it is pointing to HIGH LIMIT SETPOINT.

5.Touch the SELECT KEY.

6.Use the UP and DOWN key to select the value you wish to enter.

7.Touch the SELECT key to accept and store the new value.

•High Limit Differential:

The outlet temperature must be below the automatic High Limit setpoint minus the High LImit Differential setpoint before a call for heat can be generated.

HIGH LIMIT DIFFERENTIAL SETPOINT

ADJUSTMENT PROCEDURE

The High LImit Differential Setpoint has a range of 1 Degree F to 50 Degrees F for all models. Use the following procedure to

change the High Limit Differential Setpoint:

1.Touch the MENU key.

2.Scroll the ">" with the down key next to USER SETTING SCREEN.

3.Touch the SELECT key.

4.Scroll the ">" with the DOWN key until it is pointing to HIGH LIMIT DIFFERENTIAL SETPOINT.

5.Touch the SELECT key.

6.Use the UP or DOWN key to select the value you wish to enter.

7.Touch the SELECT key to accept and store the new value.

•Operating Differential Setpoints:

Each of the two stages has an independent Operating Differential setpoint.

OPERATING DIFFERENTIAL SETPOINT

ADJUSTMENT PROCEDURE

Each of the two stages has an independent Operating Differential Setpoint. The range of these setpoints is from 1 Degree F to 50 Degrees F for all models. Use the following procedure to change this setpoint:

1.Touch the MENU key.

2.Scroll the ">" with the DOWN key next to USER SETTING SCREEN.

3.Touch the SELECT key.

4.Scroll the ">" with the DOWN key until it is pointing to

OPERATING DIFFERENTIAL SETPOINT.

5.Touch the SELECT key.

6.Scroll the ">" with the DOWN key until it is pointing to the STAGE you want.

7.Touch the SELECT KEY.

8.Use the UP and DOWN key to select the value you wish to enter.

9.Touch the SELECT key to accept and store the new value.

•Temperature Units:

Temperature can be displayed in either °F or °C units.

•Post Circulate Delay Time:

The time circulation pump will stay on after the burner is turned off. The time in seconds is adjustable with the following values: 45, 90, 180 or continuous. If the continuous value is selected the pump will remain on at all times and the post circulate state time will be set at 45 seconds.

•Network Address:

This is a unique number assigned to this boiler to differentiate it from other boilers or water heater on the same A. O. Smith proprietary network. A valid Network Address can be any number from 1 to 31. It is set by default to zero, which is an invalid address. The boiler will not communicate until it is changed to a valid and unique number. This prevents two units from trying to respond to the same request from the PC or supervisory network device.

•Configuration Settings Screen:

Displays the status of the dipswitches installed on all boards as described on page 9.

•Log & System Info Screen: Displays the following information:

Elapsed hours of operation (Total time system has been powered up)

Number of running minutes (Number of minutes system has been in the run mode)

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.