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ON CONTINUOUS FAN OPERATION: With the thermostat fan switch set to “ON”, the indoor fan will not shut off. However, the cooling and heating systems will still operate as required by room temperatures. This provides continuous air filtering and more even temperature distribution to all conditioned spaces. FAN ONLY OPERATION: On moderate days, usually during spring and fall, when neither heating nor cooling is required, you may want to run only the fan to ventilate, circulate and filter the air in your home or building. Set the comfort control switch to “OFF” and the fan switch to “ON”. Be sure to return the switches to their original positions for normal operation. HEATING CYCLE With the thermostat in the heating position, and the outdoor temperature in the range of 20 to 30° or below, the outdoor unit will generally run 100% of the time. The Main power to the sys- tem must be kept “ON” at all times to prevent damage to the outdoor unit compressor. If necessary, the thermostat control switch should be used to turn the system “OFF”. Should the main power be disconnected or interrupted for 8 hours or longer, DO NOT attempt to start the sys- tem for 8 hours after the power has been restored to the outdoor unit. If heat is needed during this 8 hour period, use emergency heat. Unitary Products Group 035-16473-001 Rev. A (202) All E*TS systems are equipped with balance point control to provide even more efficient operation. This control will prevent the electric heater from being energized when the outdoor air is above some predetermined temperature setting (0 to 45° F). At higher temperatures, your system will provide all the heat your home will ever need. At lower temperatures, the supplemental electric heat will be energized to keep your home comfortable. When the outdoor air is cool and moist, frost may form on the surface of your outdoor coil. When this frost builds to a certain point, your system will switch to a defrost cycle. Although you may feel cooler air coming from your registers, DO NOT adjust your thermostat. The frost will melt quickly, and your system will return to normal operation automatically. FIGURE 2: COOLING CYCLE Switch your thermostat to cool. Select a comfortable thermostat temperature setting, typically between 75 and 80°. Comfort sensations vary with individuals. The lower the indoor temperature desired, the greater will be the number of hours your unit must operate. Set your thermostat 2 or 3° F below normal several hours before entertaining large groups during hot weather. People give off considerable heat and moisture. On an extremely hot day, the indoor temperature may rise 3 to 6° F above the thermostat setting. Properly selected equipment does not have the capacity to maintain a constant indoor temperature during this peak load. Over-sizing your system to handle this peak load isn't practical because the oversized system would operate much less efficiently at all other conditions. FIGURE 3: TO MAXIMIZE OPERATING EFFICIENCY HEATING CONSERVATION For the most sufficient operation, keep storm windows and doors on all year long. They not only help to insulate against heat and cold, but keep out dirt, pollen and noise, too. Closing the drapes at night, keeping fireplace dampers closed when not in use, and running exhaust fans only when necessary, will help you to retain the air you have already paid to heat. COOLING CONSERVATION To comfortably cool your home, your heat pu...

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