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Manafacture: White Rodgers File size: 513.38 kb File name: Language of manual:

See Figure 7. The heating cycle is complete, and ready for the start of the next heating cycle. RED-LOW SPEED BLU-MEDIUM SPEED MOTOR LEADS BLK-HIGH SPEED BLK BLU RED 60 180 COOL HEAT PARK PARK LINE XM 120 FAN OFF ADJUSTMENT SWITCHES FIGURE 7: Typical Heat/Cool Speed Tap Connections Unitary Products Group 035-19592-001 Rev. C (0204) If the flame is not detected within 2 seconds of the gas valve opening, the gas valve is shut off and a retry operation begins. If the flame is lost for 2 seconds during the 10-second stabilization period, the gas valve is shut off and a retry operation begins. During a retry operation, the vent motor starts a 15 second inter-purge and the ignitor warm-up time is extended to 27 seconds. If the flame is established for more than 10 seconds after ignition during a retry, the control will clear the ignition attempt (retry) counter. If three retries occur during a call for heat, the furnace will shut down for one hour. If at the end of the one hour shut down there is a call for heat, the furnace will initiate a normal start cycle. If the problem has not been corrected the furnace will again lockout after three retries. A momentary loss of gas supply, flame blowout, or a faulty flame probe circuit will result in a disruption in the flame and be sensed within 1.0 seconds. The gas valve will de-energize and the control will begin a recycle operation. A normal ignition sequence will begin after a 15 second inter-purge. If during the five recycles the gas supply does not return, or the fault condition is not corrected the ignition control will lockout for 60 minutes. During burner operation, a momentary loss of power for 50 milliseconds or longer will de-energize the gas valve. When the power is restored, the gas valve will remain de-energized and the ignition sequence will immediately restart. Hot Surface Ignition System HOT SURFACE IGNITION SYSTEM Do not attempt to light this furnace by hand (with a match or any other means). There may be a potential shock hazard from the components of the hot surface ignition system. The furnace can only be lit automatically by its hot surface ignition system. FURNACE CLEANING SECTION NOTE: The cleaning operations listed below must be performed only by a qualified service agency. Burner Removal/Cleaning The main burners should be checked periodically for dirt accumulation. If cleaning is required, follow this procedure: 1. Turn off the electrical power to the unit. 2. Turn off the gas supply at the external manual shut-off valve and loosen the ground union joint. 3. Remove the upper access panel and remove the burner box cover. 4. Disconnect wires from flame sensor, rollout switch and HSI igniter. Remove igniter carefully, as it is easily broken. 5. Remove the screws that hold the burner box assembly to the vest panel and remove the assembly. 6. Remove burners from the burner assembly. 7. Burners may be cleaned by rinsing in hot water. 8. Reassemble the burners in the reverse order. Cleaning the Heat Exchanger 1. Turn off the electrical power to the unit. 2. Turn off the gas supply at the external manual shut-off valve and loosen the ground union joint. 3. Remove the upper access panel and remove the burner box cover. 4. Disconnect wires from flame sensor, rollout switch and HSI igniter. Remove igniter carefully, as it is easily broken. 5. Remove the screws that hold the burner box assembly to the vest panel and remove the assembly. 6. Remove burners from the burner assembly. 7. Remove the upper cover plate at the top of the furnace. Remove the internal baffle. 8. The upper portion of the heat exchanger is now exposed. 9. With a long flexible wire brush, clean inside each tube at both the top and bottom. The brush must pass around the rear heat exchanger tubes and then vacuum loose the scale and dirt from each tube. 10. Clean - vacuum all burners. 11. Replace all components in reverse order. Reconnect all wiring. 12. Restore electrical power and gas supply to the furnace. 13. Check furnace operation. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and danger- ous operation. Verify proper operation after servicing. Cleaning the Secondary Heat Exchanger 1. Follow steps 1 - 8 under cleaning the Heat Exchanger. 2. Remove the vent piping from the vent blower housing. Disconnect the drain lines from the vent blower housing and from the condensate drain pan. Remove the vent blower housing blower and the condensate pan. The turbulators can then be gently removed from the secondary heat exchanger. 3. Using a stiff wire brush, remove the loose scale or soot from each tube. 4. Vacuum the secondary heat exchanger. 5. Finish the cleaning procedure by following steps 11 thru 13 under cleaning the Heat Exchanger. TROUBLESHOOTING The following visual checks should be made before troubleshooting: 1. Check to see that the power to the furnace and the ignition control module is ON. 2. The manual shut-off valves in the gas ...

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