A.O. Smith Cyclone XL 100 Series, Руководство по обслуживанию

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BURNER IGNITES )BRIEFLY)
• If the burner ignites briefly then shuts off with an “Ignition Failure” error message, follow these steps:
• Remove the connector from flame sense rod [picture of connector showing location on unit]. Inspect the connector for corrosion.
Replace if corroded or damaged. Remove Flame Sensor and clean metal end with steel wool.
• Check insulator for soot, cracks or other damage and replace if necessary.
SPARK
IGNITER
BURNER
FLAME
BURNER
(MUST BE GROUNDED)
CERAMIC INSULATOR
FLAME SENSOR
METAL CONDUCTOR
CONTROL SYSTEM
APPLIES AC CURRENT
TO FLAME SENSOR
AC CURRENT FLOWS FROM THE FLAME
SENSOR TO THE BURNER. THE BURNER
MUST BE GROUNDED FOR CURRENT TO
FLOW. DURING THIS PROCESS THE AC
CURRENT IS “RECTIFIED” AND BECOMES
A DC CURRENT. DC MICRO AMP CURRENT
THEN FLOWS BETWEEN THE FLAME SENSOR
AND THE BURNER.
Firere 9. Checkinr the Berner
• Reinsert connector on Flame Sensor and make sure the electrical connection is clean and tight.
• Recycle unit again to start another ignition cycle. If the burner ignites but the flame sense rod still fails to detect flame, contact
Commercial Technical Support.
BURNER DOES NOT IGNITE
Failure to ignite (no flame) usually means a gas supply, gas-control valve, or sparking problem. If you do not see a brief blue flame
through the sight glass during the ignition cycle (at the moment the gas control valve icon appears on the display), follow these steps:
1. Install a gas pressure gage at the gas valve’s inlet pressure port, and confirm that the gas-supply pressure DOES fall, BUT falls no
more than 2”wc from static pressure when the gas valve is energized (you will hear a click sound when the gas valve is energized):
• If there’s no change in the gas pressure reading and/or the gas valve does not energized during the ignition, check the gas valve
wiring connections and the 24 Vac at the wire plug.
• If the supply pressure falls significantly during the ignition, check the service-regulator capacity and gas-piping size to correct the
issue.
2. If you have confirmed Step 1 & Step 2, but NO flame is detected through the top-mounted combustion view-port, check the wiring
connections to the spark transformer and spark rod.
3. If you have confirmed Step 1 & Step 2, flame IS detected through the combustion view-port, BUT no flame icon is displays on the UIM,
check flame rod and flame rod wiring connections.
4. If you have confirmed Step 1 & Step 2, the flame icon is displays on the UIM momentarily or you experience occasional ignition
failures, adjust the gas valve throttle by turning it COUNTERCLOCKWISE 1/8 turn at a time.
If the gas valve setting resolves the ignition issue, you must use a combustion analyzer to verify the following:
a. That the combustion is clean.
b. The CO2 reading from the combustion flue is within 8.9% - 9.3% during heating cycle after the throttle adjustment.