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Install the clean filters with “air flow” arrow in the same direction as the air flow in your duct. Filters should be clean to assure maximum efficiency and adequate air circulation. Drapes, furniture or other obstructions blocking your supply and return air grilles will decrease efficiency. NOTE: There will be no heat available until power is reestablished. HEATING SEASON 1. Leave on Emergency Heat for at least 8 hours after electrical power is reestablished if the power was off more than 8 hours. 2. Switch thermostat back to Heating or Auto. COOLING SEASON 1. Switch thermostat to Off position. Unitary Products Group 2. Do not switch to Cooling or Auto until electrical power has been reestablished for 8 hours if the power was off more than 8 hours. SERVICE CALLS There are a few instances where you can avoid unnecessary service calls. (See Troubleshooting Guide above). The flashing light on the system thermostat of E*TS units is capable of providing you with time and money saving information. The fault code numbers listed can be handled by taking the corrective action indicated. Call qualified serviceman if displaying fault code numbers not listed. PARTS INFORMATION Replacement parts are available from local YORK contractor/dealers or the nearest YORK distribution center. TROUBLESHOOTING GUIDE CHARACTERISTICS OF HEAT PUMPS A CONSTANT HEAT Heat pumps have a noticeably cooler supply air temperature than furnaces. The common practice of over-sizing furnaces contributes to an “off-and-onagain” operation with short blasts of hot supply air. The heat pump system is sized more closely to the heating needs of your home. Heat is supplied at a lower temperature over a longer period of time to provide a more constant heat, and it may give you the impression that your system “never stops running". WATER RUN-OFF During the heating cycle, in mild weather you may notice water running off the outdoor coil. Moisture from the air is condensed on the outside sur face of the coil where it gathers and runs off. No need for alarm, your unit has not sprung a leak! OUTDOOR COIL DEFROSTING At certain outdoor conditions (low temperature, high humidity), frost may build up on the coil of the outdoor unit. In order to maintain heating efficiency, the system will automatically defrost itself. Steam rising from the outdoor unit is normal and is an indication of proper operation. The vapor cloud will only last for a few minutes. When the defrost cycle is completed, the system will automatically switch back to heating. Electric heat is automatically energized to maintain comfort during defrost. PROBLEM CHECK: ACTION TO TAKE FAULT CODE 1. Thermostat for proper setting. Set thermostat to proper setting. - 2. Circuit breakers and fuses. Reset circuit breakers - Replace blown fuses. - NO HEAT OR COOLING 3. Check Outdoor unit for dirty coil. (Cooling) Clean coil, see “Coil Care” section. 2 4. Outdoor unit for snow accumulation. (Heating) Remove snow. 5 5. Indoor unit for dirty filter. (Heating) Clean or Replace, see “Filter Care” section. 2 6. Emergency Heat Light Status on thermostat. After completing the checks and actions above, turn thermostat to “OFF” for 10 seconds and attempt restart. Wait 5 minutes. If system does not start, call qualified serviceman. Obtain the fault code number of times the Emergency Heat light on the thermostat flashes between pauses. Subject to change without notice. Printed in U.S.A. 035-16473-001 Re...

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