Boiler Manual

continued

CHART 7 — Insufficient heat or no heat to system (POWER light on steady)

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.

• Has it been at least 5 minutes since setting thermostat to call for heat? If not, wait 5 minutes. Is system heating?

• Is thermostat set to call for heat? Remove thermostat wires at boiler and check continuity across the two wires. If circuit isn't closed, check external thermostat (zone valve, relay, etc.) wiring. Correct problems and retry.

• Reconnect external thermostat wiring at boiler.

Is thermostat circuit closed (continuity across wires)?

No

 

Yes

 

 

 

Is boiler System circulator operating?

No

Yes

•Remove CIRCULATOR harness plug from CIRCULATOR plug receptacle (Figure 25, Item 7, page 44). Check with voltmeter across pins of control module receptacle.

Does voltmeter show 120 VAC across pins?

No

Yes

Are all red lights off?

No

Yes

 

 

 

Wait 30 seconds. Are all red lights off?

No

Yes

 

 

 

Replace control module. Retest.

•Boiler is in standby.

•Set thermostat to call for heat and recheck

operation.

•Verify Sequence of operation, Figure 18, page 31.

•

Replace control

 

•

Repair/replace

 

module.

 

 

circulator. Retest.

•

Retest.

 

•

Repair/replace

 

 

 

 

wiring. Retest.

 

 

 

 

 

 

 

 

 

• Wait 5 minutes.

Is FLAME light on?

Yes

 

 

No

 

 

 

 

 

 

 

 

 

 

• If you have sufficient heat — boiler should be in normal

 

 

 

 

 

 

 

 

 

 

Is LIMIT light on?

 

 

 

 

 

 

operating sequence. (See normal sequence of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

operation, Figure 18.)

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

Yes

• If you have less than sufficient heat —

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is vent or combustion air piping free of blockage?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•

Check limit switch

 

 

•

Replace control module.

 

 

No

 

 

 

 

Yes

 

 

 

contacts with continuity

 

 

•

Retest.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

checker.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•

Correct conditions and

 

Contact your Weil-McLain

 

 

 

Are limit switch contacts

 

 

 

 

 

 

 

 

 

 

 

 

recheck operation.

 

sales representative.

 

 

 

 

closed?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check rollout switch

• See Figure 18, page 31

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

Yes

 

 

 

 

 

for normal sequence of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

continuity — is switch

 

operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closed?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

Yes

• Wait for boiler water to cool to temperature 20 to 30 ˚F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lower than temperature set on limit switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Are limit switch contacts closed?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•

Replace rollout switch.

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•

Check any other

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Boiler water temperature exceeded

 

If rollout thermal fuse element has

 

 

 

limit controls wired

 

 

 

 

 

setting on limit switch with thermostat

 

opened, determine cause and

 

 

 

 

into the limit

 

 

 

 

 

 

 

 

 

 

•

Replace

 

calling for heat. Boiler is OK. (See normal

 

correct condition. Failure to do so

 

 

 

circuit. If all are

 

sequence of operation, Figure 18, p. 31.)

 

will cause severe personal injury,

 

 

 

OK, then replace

 

limit switch.

 

 

 

 

 

 

 

• Also check setting on limit switch (should

 

death or substantial property

 

 

 

 

control module.

•

Retest.

 

 

 

 

 

 

 

be above 140˚F.).

 

damage.

 

 

 

 

 

 

 

•

Retest.

 

 

 

 

 

 

 

 

 

 

 

 

 

Part number 550-110-260/0200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

51

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Image 51
Weil-McLain 550-110-260/02002 manual Verify Sequence of operation
Page 50 Page 52

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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