Weil-McLain 550-110-710/0107 manual 9a Operation sequence, During main burner operation

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GOLD CGi Gas-Fired Water Boiler — Boiler Manual

9a Operation — sequence

1.Read Operating instructions on page 40. 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.Circulator energizes. If limit circuit is closed, the inducer starts. After pressure switch proves proper airflow, control module initiates 30-second pre- purge.

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.

erator 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.

5.During main burner operation:

a.Control module monitors pilot flame current. If signal is lost, main valve closes, spark gen-

10.Return the thermostat to normal setting.

11.Set thermostat heat anticipator setting as instructed in Figure 32, page 39.

Figure 30 Control module sequence of operation — status light indications

Part Number 550-110-710/0107	37

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Contents Gold CGi How it works Gold CGi Gas-Fired Induced-Draft Water Boiler Contents Please read before proceeding Installations must follow these codes 1a Prepare boiler location codes & checklistBefore locating the boiler, check the following 1b Prepare boiler location clearances 1c Prepare boiler location vent system When removing boiler from an existing common vent systemChimney or vent require- ments Products to avoid 1d Prepare boiler location air contaminationAir openings must be provided 1e Prepare boiler location air openingsAir opening options Two openings Air supply from inside the buildingMotorized air dampers Exhaust fans and air moversSingle air opening option Exception for large spacesOrifice replacement procedure 2a Prepare boiler placement & setupPlace boiler/crate near position Inspect orifices and burnersHydrostatic pressure test 2b Prepare boiler pressure testDrain and remove fittings Prepare boiler for testVenting chimney draft venting 3a Venting general informationCGi venting methods Chimney draft or Direct exhaust Chimney draft ventingObtain vent system components 3c Venting Direct exhaust componentsVent StaR-34 Vent starter 3d Venting direct exhaust vent starterVent termination minimum clearances 3e Venting direct exhaust terminationVertical venting See . Follow vent 3f Venting direct exhaust installationSidewall venting See Figures 14 Using any termination other than one of those shown 4a Water piping general information Diaphragm-type or bladder- type expansion tank Figure 4b Water piping single-zone systemClosed-type expansion tank Piping multiple zones 4c Water piping multiple zonesZoning with circulators Temperature gauges 4d Piping low temperature systemsValve adjustment Primary/secondary preferred bypass piping methodPrimary/secondary piping BOILER-bypass piping method Valve adjustmentBoiler-bypass piping Zoning with SYSTEM-bypass piping method Prevent chilled water from entering boiler 4e Water piping refrigeration systemGas piping Connecting gas supply piping to boilerNatural Gas Propane GasElectrical installation must comply with Field wiringWiring connections Thermostat7a Start-up preparation Freeze protection when usedCheck for gas leaks Determine if water treatment is neededFill the system with water Do not use petroleum-based cleaning or sealing compoundsInspect system water piping Inspect base insulationStart the boiler 7b Start-up operate boilerCheck system and boiler Check burner flames 7c Start-up if boiler doesn’t startCheck for Pilot burner flame FigureThermostats Check-out procedure checklistDuring main burner operation 9a Operation sequenceSchematic wiring diagram 9b Operation wiring diagramsLadder wiring diagram 9c Operating instructions CGi-25 to CGi-6 9c Operating instructions CGi-25 to CGi-6 9c Operating instructions CGi-25 to CGi-8 Verify Proper Operation After Servicing 10a Service and maintenance schedule10b Service and maintenance annual start-up Burners and base 10b Service & maintenance annual start-upCondensate drain system Inducer motorCold fill and operating pressures Gas pipingAir vents and air elimination Limit controls and cutoffsBoiler relief valve Review with ownerReview the User’s Information Manual with the owner 11b Troubleshooting components 11a Troubleshooting procedureBefore troubleshooting Air pressure switchTroubleshooting the control module Control indicator lightsControl indicator lights Lockout modes Control moduleControl module connections Chart Light flashing 11c Troubleshooting control module lightsRemove 120 VAC in plug , Item 3, page 50 on control module VAC in plugChart 2 Tstat Circ & Power lights flashing Chart 3 Press Switch & Power lights flashing Usually indicates flame sensed when it shouldnt be there Chart 4 Flame & Power lights flashingDoes blower motor operate? Item 8 , Operation, Figure Verify SequenceSection assembly Base Jacket Trim Controls 12a Replacement partsControls Repair Parts Lists Section assembly 12b Replacement parts section assemblyBase assembly 12c Replacement parts baseDescription Weil-McLain Part number Jacket assembly 12d Replacement parts jacketModel Weil-McLain part number BoilerBoiler Model Weil-McLain part number Fittings shown are included with boiler 12e Replacement parts trimPropane gas components 12f Replacement parts controlsDimensional drawing 13a Dimensions13b Ratings Removal of Combustion Chamber Lining or Base Panels Handling ceramic fiber and fiberglass materials