Weil-McLain 550-110-260/02002 manual 9a Operation sequence, Raise room thermostat to call for heat

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Boiler Manual

9a Operation — sequence

1.Read Lighting instructions on page 34. This information is also located on a label on the inside of the boiler jacket door panel.

2.Raise room thermostat to call for heat.

3.Inducer and circulator energize. After pressure switch proves proper airflow, control module initiates 30-second prepurge.

4.Control module sparks the pilot and opens pilot valve in main gas valve.

a.If pilot does not light within 15 seconds, pilot valve is closed and spark generator is turned off. Control module initiates a 15-second postpurge, then starts a new cycle.

b.If pilot does light and control module senses flame current, spark generator is turned off and main valve opens.

5.During main burner operation:

a.Control module monitors pilot flame current. If signal is lost, main valve closes, spark generator activates and sequence returns to step 4.

b.If power is interrupted, control system shuts off pilot and main gas valves and restarts at step 1 when power is restored.

6.In the event the limit control shuts down the boiler — The control module closes the pilot and main gas valves, but keeps the inducer operating for 15-second postpurge.

— The circulator continues to operate.

7.Lower room thermostat setting to stop call for heat. Thermostat is satisfied — Pilot and main gas valves are closed — Inducer operates for 15-second postpurge — Circulator is shut off.

8.Boiler is now in the off cycle.

9.Repeat steps 1 through 6 several times to verify operation.

10.Return the thermostat to normal setting.

11.Set thermostat heat anticipator setting to 0.4 amps, adjusted for gas valve and control current.

Figure 18 Control module sequence of operation — status light indications

Steps

Call for

POWER

TSTAT

LIMIT

PRESS

FLAME Timing

 

 

heat?

 

CIRC

 

SWITCH

 

(Fol low ing s tep 8, cycle goes bac k to step 1 .)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Standby

NO

 

 

 

 

—

 

· Waiting for call for heat

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.

Call for heat

YES

 

 

 

 

—

 

· Circulator on

 

 

 

 

·Blower on

3. Limit circuit

YES

—

· Limit controls closed

·Block switch contacts closed

4. Pressure circuit

· Pressure switch contacts closed

YES

35 sec

· Prepurge for 30 seconds

5.Pilot flame proven *

·

Gas valve open

YES

15 sec

·

Pilot remains on

 

 

·Boiler producing heat

6. Limit cycle

YES

—

· Limit circuit open

·Gas valve closed

7. Flame outage *

YES

—

· Flame out

·Boiler recycles

8. Thermostat satisfied

· Circulator off

NO

15 sec

·Blower postpurge

9. Circulator exercise routine

NO

 

 

30 sec

· Circulator turns on for 30 seconds

 

 

if boiler not operated for 30 days

 

 

 

 

 

 

 

or

= "ON"

= "OFF"

 

 

 

 

 

 

 

*If pilot flame is not proven in 15 seconds, control module will flash the FLAME light, but will continue indefinitely with attempts to light the pilot burner. The control module will not lockout on a failure to establish flame. It will lockout if line voltage polarity is reversed, stray voltage is sensed on thermostat line, pressure switch sticks closed or fails to make within 5 minutes or if flame is sensed when it shouldn’t be there. The boiler will reset after these lockouts if any of the following occurs:

• 1 hour waiting period • Opening and closing of thermostat circuit • Removal of 120 VAC power for at least 45 seconds. 26030

Part number 550-110-260/0200

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Contents Page ① Control module How it worksPage Contents Please read before proceeding InstallerUser 1a Prepare boiler location codes & checklist 1b Prepare boiler location clearances Residential garage installationFlooring and foundation Removing from existing vent 1c Prepare boiler location vent systemAir contamination 1d Prepare boiler location contaminationCGs combustion air options 1e Prepare boiler location air openingsSizing air openings for CGs installations Inspect orifices and burners 2a Prepare boiler placement & setupOrifice replacement procedure Place boiler/crate near positionFill and pressure test 2b Prepare boiler pressure testPerform hydrostatic pressure test Prepare boiler for test3a Water piping general information Closed-type expansion tank Figure 3b Water piping single-zone systemExpansion tank Diaphragm-type or bladder-type expansion tank FigureConverted gravity or steam systems 3c Water piping multiple zonesTypical piping multiple-zone installations 3d Water piping low temp systems Temperature gauges Valve adjustmentFor radiant heating or converted gravity systems Primary/secondary preferred bypass piping3e Water piping low temp systems Boiler-bypass alternate piping 3f Water piping low temp systems 3g Water piping refrigeration system 3f system-bypass alternate pipingPrevent chilled water from entering boiler Venting and combustion air Connecting gas supply piping to boilerGas piping Length Natural GasJunction Box furnished Field wiringWiring connections ThermostatCheck for gas leaks Freeze protection when used7a Start-up preparation Determine if water treatment is needed7b Start-up operate boiler 7a Start-up preparationCheck burner flames 7c Start-up if boiler doesn’t startCheck for Installation and service certificate Check-out procedure checklistRaise room thermostat to call for heat 9a Operation sequenceSchematic wiring diagram 9b Operation wiring diagramsService 9c Operation lighting instructions For Your Safety Read Before OperatingService technician 10a Service and maintenance schedule10b Service & maintenance annual start-up Inducer motor Burners, base and inlet air boxBoiler heating surfaces Condensate drain system10b Service & maint. annual start-up Lever must be operated AT Least Boiler relief valveReview with owner Before troubleshooting 11a Troubleshooting procedureCheck pressure switch setting 11b Troubleshooting air pressure switchControl indicator lights lockout modes 11c Troubleshooting control moduleControl module connections Chart 1 Troubleshooting Power light status 11d Troubleshooting control module lightsChart 2 Tstat Circ & Power lights flashing Chart 3 Press Switch & Power lights flashing Chart 4 Flame & Power lights flashing Turn OFF Power to boiler at service switch or breaker Does blower motor operate? Verify Sequence of operation, , 12a Replacement parts Page Page Page Page Page Dimensional drawing 13a DimensionsDOE 13b RatingsRemoval of Combustion Chamber Lining or Base Panels Handling ceramic fiber and fiberglass materials

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.

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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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