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Part number 550-141-850/069968
GOLD GV Water boiler series 3 — manualGOLD GV Water boiler series 3 — manual
GOLD GV Water boiler series 3 — manualGOLD GV Water boiler series 3 — manual
GOLD GV Water boiler series 3 — manual
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.
Suction
Pressure
Inclined tube
manometer
85027
Shown with Robertshaw 7200DERN gas control
White
Red
Figure 33 Connecting a manometer to
check air pressure switch. DO
NOT use this arrangement to
check gas valve.
Check switch pressure setting
1. See Figure 33.
2. Remove both air pressure switch hoses from air
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.
Blower will run but burner will not ignite.
5. Check for 24 VAC between both air pressure switch
terminals and ground.
6. If manometer reading is at least 1.4" w.c., but there is
not 24 VAC between both air pressure switch
terminals and ground, replace air pressure switch.
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.
Troubleshooting — air pressure switchXIc