GOLD GV Water boiler series 3 — manual
XIc Troubleshooting — air pressure switch
Checking the air pressure switch
Do not use manometer as shown in Figure 33 to test gas valve outlet pressure. Where instructed in this manual to check gas valve outlet pressure, follow instructions carefully, particularly regarding connection of manometer. Manometer fluid will cause permanent damage to gas valve. Severe personal injury, death or substantial property damage can result.
Check switch pressure setting | Figure 33 Connecting a manometer to | ||
1. | See Figure 33. | check air pressure switch. DO | |
NOT use this arrangement to | |||
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2. | Remove both air pressure switch hoses from air | check gas valve. | |
pressure switch.
3.Install tees and tubing as shown in Figure 33 to inclined manometer.
4. | Turn off gas valve and set thermostat to call for heat. | Suction | Pressure |
| Blower will run but burner will not ignite. |
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5. | Check for 24 VAC between both air pressure switch |
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| terminals and ground. |
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6. | If manometer reading is at least 1.4" w.c., but there is | Inclined tube |
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| not 24 VAC between both air pressure switch | manometer |
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| terminals and ground, replace air pressure switch. |
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Troubleshooting air pressure reading
1.If manometer reading is lower than 1.4" w.c. check for possible causes:
•blockage in hoses.
•loose blower wheel on motor shaft.
•blower motor not at proper rpm.
•blockage in air inlet or hose.
•blockage in flue pipe or termination.
•condensate trap filled w/condensate.
Return to normal operation
1.When pressure reading is proper and air pressure switch is operating properly, remove tees and reinstall hoses to air pressure switch.
Red
White 
Shown with Robertshaw 7200DERN gas control | 85027 |
68 | Part number |
