Boiler Manual - Weil-McLain
Boiler Manual - Weil-McLain
Boiler Manual - Weil-McLain
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GV90+ gas-fired water boiler — <strong>Boiler</strong> <strong>Manual</strong>Start-up (continued)5. Position and zero manometer per manufacturer’s instructions. Themanometer must have at least 6” of tubing above the fluid level orfluid may be drawn into the gas valve.Figure 73 Tools required for gas valve outletpressure measurementIf manometer fluid is drawn into gas valve body, gas valvemust be replaced. Fluid in valve will cause it to malfunction,possibly resulting in severe personal injury, deathor substantial property damage.6. Disconnect tube from hose barb on gas valve vent tap. Connecttube end to tee hose fitting as shown in Figure 74. Then add lengthof hose from tee hose fitting to gas valve vent tap.7. Connect positive side manometer hose to top of the tee hose fitting(Figure 74).8. Connect negative side manometer hose to the barrel of the gasvalve outlet pressure tap (Figure 74).Check gas valve setpoint1. Open manual gas valve and turn on electrical power to boiler.2. Start boiler and allow boiler to run for 5 minutes.3. Read manometer. This is the gas valve outlet pressure set point. Ifset point is between – 0.1” w.c. and – 0.3” w.c. go to step 7.4. If gas valve setpoint is not between – 0.1” w.c. and – 0.3” w.c., useT-40 driver to remove cap on gas valve pressure regulator.5. Turn gas valve pressure regulator screw counter clockwise tolower gas valve set point to – 0.2” w.c.6. Reinstall cap on gas valve pressure regulator using T-40 driver.7. Cycle boiler off and on several times to verify gas valve set point.If set point does not remain between - 0.1” w.c. and – 0.3” w.c.,readjust as necessary.8. Close manual gas supply valve and turn off electrical power toboiler.9. Remove manometer hose from gas valve outlet pressure tap barreland replace sealing screw.10. Remove tee hose fitting and added tube.11. Reinstall hose on gas valve vent tap hose barb.12. Open manual gas supply valve and turn on electrical power toboiler.1 U-tube manometer with tubing -Manometer provides a fine scale byslanting the manometer (Dwyer Model1227 recommended).2 Tee hose fitting (provided in highaltitude kit).3 1/16" flat head screwdriver.4 T-40 star drive forgas valve pressureregulator coverscrew.Figure 74 Carefully connect manometer to gas valveas shown, following instructions on thispage (see legend at left)Legend for Figure 741 Gas control outlet pressure tap — located on back side of gas control. Use tapclosest to gas control gas outlet —Remove screw from gas control outlet pressuretap and slide hose over tap2 Add tee hose fitting as shown3 Existing hose to gas control vent tap hose barb — Remove from gas control venttap and connect to end of tee as shown4 Gas control pressure regulator cap5 Honeywell Type VK8115V gas valve6 Gas outlet vent tap7 Gas outlet piping8 Add hose from gas control vent tap to tee hose fittingPart number 550-142-054/1211 63