Boiler Manual

continued

CHART 5 — FLAME light flashing and POWER light on steady

ALSO — Troubleshooting failure to establish main flame

Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow instructions could result in severe personal injury, death or substantial property damage.

• Are main manual shutoff valve and boiler gas valve open?

• Is pilot flame visible through inspection port?

No

 

 

 

Yes

•▲TURN OFF POWER▲ to boiler at service switch or breaker.

•Open main manual shutoff valve and boiler gas valve (per Lighting instructions in this manual). Wait at least 45 seconds.

•Turn on power at service switch or breaker. Allow boiler to cycle.

 

Does FLAME light flash now?

No

 

 

Yes

No

•Check the voltage across terminals "C" and "A" of the gas valve (see Table G, page 33).

Is 24 VAC present there?

Yes No

Yes

•Make sure ground wire terminal is securely fastened to control module mounting screw.

•Boiler should be in normal operating sequence.

•Observe operation until thermostat is satisfied and blower has completed its post-purge cycle.

•Verify inlet gas pressure at gas valve:

Natural gas — 5.0" w.c. min/14.0" w.c. max

Propane — 11.0" w.c. min/14.0" w.c. max

Is gas present at gas valve inlet and

within above range?

Yes No

 

 

 

 

 

• Check the voltage across

• If the wiring from the

 

 

 

 

terminals "B" and "A" (see

control module to gas

 

 

 

Table G, page 33) of the

valve is intact, replace the

 

 

 

gas valve.

 

 

 

 

 

 

 

 

 

 

control module.

 

 

 

Is 24 VAC present there?

• Retest.

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Verify inlet gas pressure at gas valve: Natural gas — 5.0" w.c. min/14.0" w.c. max Propane — 11.0" w.c. min/14.0" w.c. max

•▲TURN OFF POWER▲ to boiler at service switch or breaker.

•Remove air inlet box top (see Figure 27, page 54 for location).

•Verify pilot gas line is not kinked, obstructed or damaged and is correctly attached to pilot and gas valve.

•Verify pilot ignition electrode, electrode ceramic and spark lead wire from control are in good condition. Spark gap should be approximately 1/8".

•Correct any above problems, replacing pilot if burner or wiring is damaged.

•Reinstall air box top to operate boiler for retest after any changes or corrections.

•If none of the above corrects problem, then replace the control module, reinstall air box top, and retest.

•Contact gas supplier to correct pressure or gas supply.

•▲TURN OFF POWER▲ to boiler at service switch or breaker.

•Remove air inlet box cover (see Figure 27, page 54 for location).

•Verify pilot burner is securely attached to pilot bracket, bracket is securely attached to cross tie, and there is no corrosion on the parts which would affect the ground path for flame sense.

•Verify that pilot flame rod, flame rod ceramic and lead wire from control module to flame rod are in good condition.

•Correct any above problems, replacing pilot if burner or wiring is damaged.

Is gas present at gas valve inlet and within above range?

No

 

Yes

 

 

 

 

 

 

 

 

 

 

• ▲TURN OFF POWER▲ to boiler at service switch or breaker.

• Check flame signal — Detach sense lead from igntion control (Figure 25, item 8, page 44).

• Connect negative lead of MICROAMMETER to control sense terminal (Figure 25, item 8, page 44). Connect positive lead of MICROAMMETER to sense wire.

• DISCONNECT red wire connected to terminal "B" (see Table G, page 33) of the gas valve.

• Turn on power to boiler and allow to cycle. As soon as pilot is burning, the MICROAMMETER should read at least 1.0 microamp.

Is flame signal at least 1.0 microamp?

No

 

 

Yes

 

 

 

 

 

 

 

 

 

• If none of the previous steps

 

• If the wiring from the

(including replacing pilot)

 

 

control module to gas

corrects problem, then replace

 

 

valve is intact, replace the

the control module, reinstall air

 

 

control module and retest.

box cover and retest.

 

 

 

 

 

 

 

 

 

Part number 550-110-260/0200

49

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Weil-McLain 550-110-260/02002 manual Turn OFF Power to boiler at service switch or breaker
Page 48 Page 50

550-110-260/02002 specifications

Weil-McLain is a well-known manufacturer of high-quality heating systems and boiler solutions, and the 550-110-260/02002 model is a testament to the company's commitment to innovation and performance. This particular boiler is designed for commercial and residential applications, providing exceptional heating efficiency and reliability.

One of the standout features of the Weil-McLain 550-110-260/02002 is its robust construction. Built using durable materials, this boiler is engineered to withstand demanding environments while maintaining optimal performance. The unit boasts a high thermal efficiency rating, which translates to lower energy costs and reduced environmental impact. The advanced design ensures that fuel consumption is minimized while delivering consistent heat output.

The Weil-McLain 550-110-260/02002 utilizes a multi-stage burner that enhances combustion efficiency. This feature not only reduces emissions but also improves overall energy use, making it an environmentally friendly choice. The sophisticated control system allows for precise modulation of the burner, ensuring that the boiler operates at peak efficiency under various load conditions.

The boiler is equipped with a user-friendly digital control interface, providing operators with real-time monitoring and diagnostics. This allows for easy adjustments and troubleshooting, which helps to reduce maintenance downtime. The integrated safety features enhance the operational reliability of the unit, ensuring safe operation in any environment.

Another important characteristic of the Weil-McLain 550-110-260/02002 is its adaptability. It can be configured to work with various types of fuel including natural gas and propane, giving users the flexibility to choose the most cost-effective energy source. This versatility also helps to extend the lifespan of the boiler as it can be easily adapted to changing energy needs.

In conclusion, the Weil-McLain 550-110-260/02002 is a high-performance boiler that combines durability, efficiency, and advanced technology. With its robust construction, efficient burner system, and user-friendly controls, it stands out as a reliable heating solution for both commercial and residential applications. The commitment to quality and innovation makes this model a preferred choice for those seeking dependable heating systems. Whether for new installations or replacements, the Weil-McLain 550-110-260/02002 delivers exceptional performance and value.
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