Testing the Electrical Power Supply | Bradford-White Corp B4

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Figure 38. Testing the manual reset hi-limit switch.

5.2.3Testing the Electrical Power Supply

The electrical components operate with supply

voltage ranging from 103 to 126VAC at 60 Hertz (Hz). To test the electrical power supply:

1.Measure the voltage at the hot and neutral connections inside the heater electrical junction box.

2.Voltage outside of the required range may be due to poor wiring connections, to other loads (e.g., air conditioners, compressors) on the circuit,

to high pump load, or to an electrical utility company problem.

5.2.4 Testing the Manual Reset

Hi-Limit Switch

To test the manual reset hi-limit switch (see Figure 38):

1.Touch the other lead of the voltmeter to both terminals of the manual reset hi-limit switch. The voltmeter should read 24 to 28VAC at both terminals.

2.If no voltage is detected at one terminal, reset the manual reset hi-limit switch by pressing the reset button. Check the temperature setting.

3.If after pressing the reset button there is still no voltage indicated at one terminal, replace the manual reset hi-limit switch. An open switch may indicate excessive water temperatures or improper setting.

BRADFORD WHITE

5.2.5 Testing the Flow Switch

The flow switch is a safety device that senses water flow through the heater. When the switch senses adequate water flow, it closes, allowing the heater to fire. If the water flow is too low, the switch remains open and prevents the heater from firing regardless of the temperature control setting.

The flow switch is factory mounted and wired. Never attempt to repair the flow switch. If the flow switch is found to be defective, replace the flow switch. To test the flow switch:

1.Remove cap from flow switch.

2.Touch a voltmeter lead to each terminal of the flow switch.

3.If the voltmeter reads voltage at each of the terminals, the switch is good.

4.If there is no voltage at one terminal, it indicates an open switch. Check flow switch paddles to determine if they are broken, missing or frozen. Replace the flow switch.

5.2.6 Testing the Fusible Link

(flame roll-out switch)

The fusible link is a thermally fusible element which shuts down the heater if it detects excessive temperatures inside the heater flue collector compartment. To test the fusible link (flame roll-out switch, if installed):

1.Touch the voltmeter lead to the lower terminal on the terminal block (see Figure 39).

Red	Yellow

Figure 39. Testing the fusible link.

B4 specifications

Bradford-White Corp B4 is a remarkable water heater that embodies innovation, efficiency, and reliability. This product is designed to meet the stringent demands of both residential and commercial applications, making it a versatile choice for various users.

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Safety is also a top priority for Bradford-White. The B4 includes safety features such as a temperature and pressure relief valve, which acts as a safeguard against potential malfunctions. This adds an extra layer of peace of mind for users concerned about operational safety.

In summary, the Bradford-White Corp B4 combines high efficiency, durable construction, advanced technologies, versatility, and safety features. This makes it more than just a water heater—it is a dependable solution for ensuring hot water availability for various applications. Whether for a home or a commercial setting, the B4 represents a commitment to quality and performance that users have come to trust.