Heater Will Not Shut Off | Bradford-White Corp B4 instruction

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Copper Brute B4 Volume Water Heaters	Page 31

Thermocouple Thermocouple

Adapter

Gas Valve

Pilot

Millivolt

Meter

Figure 42. Testing the pilot thermocouple.

1.Check all wire connections, ignition cable, and using a mirror, make sure there is a pilot flame.

2.If everything appears all right, measure flame sensing current by connecting a direct current (DC) microamp meter between terminal No. 12 and the GND (BURNER) terminal on the ignition control (see Figure 43).

NOTE: Separate the microamp meter leads from each other and clear the heater chassis for most of their length to properly perform this test.

3.When the pilot lights, the microamp meter should read 1.5 microamps or more with or without the main burners firing. A smaller current could be caused by poor pilot flame, the position of the pilot electrode, or bad cable and connectors.

4.If the pilot flame and sensor electrode are all right, but there is no main burner ignition, clip one lead from a volt meter between the yellow wire terminal on the transformer and the brown wire terminal on the gas valve.

5.If the voltmeter reads between 20 to 28VAC, but the main burners do not fire, replace the gas valve (see Section 4.2).

5.2.15 Testing for Burner Ignition

(for standing pilot)

If the pilot flame and pilot thermocouple generator are all right, but there is no main burner ignition:

1.Clip one lead of a volt meter between the yellow wire on the transformer and the brown wire terminal on the gas valve.

2.If the volt meter reads between 20 to 28VAC, but the main burners do not fire, replace the gas valve (see Section 4.2).

Figure 43. Flame sensing current.

5.2.16 Heater Will Not Shut Off

1.If the heater stays on with the brown wire on the gas valve disconnected, replace the gas valve (see Section 4.2).

WARNING

Never attempt to repair the gas valve. Such attempts will void the warranty, and could lead to dangerous results.

2.Check electrical components for loose wires. Disconnect one of the lead wires on the gas valve. If the heater goes off, the wiring could be at fault. Repair or replace as necessary.

5.2.17On-Off Main Burner Cycling

The main burners cycling on and off can be

caused by:

1.Poor wind conditions on an outdoor installation.

2.Pilot components out of position.

3.Low gas pressure causing an improper pilot flame.

The pilot flame may appear to be all right until the main burners come on, then the pilot flame shrinks. An undersized gas supply line may cause this.

5.2.18Testing the Terminal Strip/ External Controls

The terminal strip has been included so the heater can be operated by various external controls not provided by Bradford White. Determine whether or not an external control is open by checking for voltage at each terminal. If there is voltage at one terminal and not the other, examine the external control. It may require service or replacement.

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.

One of the standout features of the Bradford-White B4 is its high-efficiency operation. With advanced insulation technologies, this water heater minimizes heat loss, allowing it to perform efficiently while conserving energy. This efficiency translates to significant cost savings on utility bills, making the B4 an economical option over its lifespan.

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The Bradford-White B4 is equipped with state-of-the-art technologies to enhance user convenience. Among these technologies is the ICON System, which features an advanced gas control. This control system allows for precise temperature management and ensures optimal performance. Additionally, the B4 comes with a built-in diagnostic system that provides insight into the operation of the unit, helping users identify potential issues before they escalate.

Another significant characteristic of the B4 is its variety of sizes and configurations. This versatility allows for easy installation in different spaces, whether it be a compact utility room or a larger commercial setup. Available in various capacities, the B4 can efficiently deliver hot water for various needs, catering to families of different sizes or businesses with diverse requirements.

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.