York P*UR Installation Instructions Manual

Contents

York P*UR Installation Instructions Manual Manual pdf 36 page image

035-17477-001 Rev. A (801)36 Unitary Products GroupBURNER REMOVAL/CLEANINGThe main burners should be checked periodically for dirtaccumulation.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 shutoffvalve and loosen the ground union joint.3. Remove the upper access panel and remove the burnerbox cover.4. Remove the screws that hold the burner box assembly tothe vest panel and remove the assembly.5. Remove burners from the burner assembly.6. Burners may be cleaned by rinsing in hot water.7. Reassemble the burners in the reverse order.CLEANING THE HEAT EXCHANGER1. Turn off the main manual gas valve external to thefurnace.2. Turn off electrical power to the furnace.3. Remove the upper access panel and remove the burnerbox cover.4. Disconnect wires from flame sensor, rollout switch andHSI igniter. Remove igniter carefully, as it is easilybroken.5. Remove the screws that hold the burner box assembly tothe vestibule panel and remove the assembly. The upperportion of the heat exchanger will now be exposed.6. Remove the upper cover plate at the top of the furnace.Remove the internal baffle.7. The upper portion of the heat exchanger is nowexposed.8. With a long flexible wire brush, clean inside each tube atboth the top and bottom. The brush must pass aroundthe rear heat exchanger tubes. Vacuum loose scale anddirt from each tube.9. Clean - vacuum all burners.10. Replace all components in reverse order. Reconnect allwiring.11. Restore electrical power and gas supply to the furnace.12. Check furnace operation.CLEANING THE SECONDARY HEAT EXCHANGER1. Follow steps 1 thru 10 under Cleaning the Primary HeatExchanger.2. Remove the vent piping from the venter housing. Discon-nect the drain lines from the venter and from the conden-sate drain pan. Remove the venter blower and thecondensate pan. The turbulators can then be gentlyremoved from the secondary heat exchanger.3. With a stiff wire brush, brush out loose scale or soot.4. Vacuum the secondary heat exchanger.5. Finish the cleaning procedure by following steps 10 thru12 under Cleaning the Primary Heat Exchanger.VENT/AIR INTAKEShould it be necessary to service the vent/air intake system,the manufacturer recommends this service be conducted bya qualified service agency.The operation of this appliance requires the reassembly andresealing of the vent/air intake system as specified on Page11.TROUBLESHOOTINGThe following visual checks should be made before trouble-shooting:1. Check to see that the power to the furnace and the igni-tion control module is ON.2. The manual shutoff valves in the gas line to the furnacemust be open.3. Make sure all wiring connections are secure.4. Review the sequence of operation.Start the system by setting the thermostat above the roomtemperature. Observe the system's response. Then use thetroubleshooting section in this manual to check the system'soperation.FURNACE CONTROL DIAGNOSTICSThe furnace has built-in, self diagnostic capability. If a systemproblem occurs, a fault code is shown by a blinking red LED.It is located behind a clear view port in the blower compart-ment door. DO NOT remove the furnace blower compartmentpanel OR turn off furnace power as either action will clear thecontrol's memory of the fault.The control continuously monitors its own operation and theoperation of the system. If a failure occurs, the LED will indi-cate the failure code. If the failure is internal to the control, thelight will stay on continuously. In this case, the entire controlshould be replaced as the control is not field repairable.Flash sequence codes 1 through 11 are as follows: LED willturn “on” for one second and “off” for one second. This pat-tern will be repeated the number of times equal to the code.For example, six “on” flashes equals a number 6 fault code.Label all wires prior to disconnection when servic-ing controls. Wiring errors can cause improper anddangerous operation. Verify proper operation afterservicing.