Assessments - 3, GPA: 4.7
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If the system does not start again, the green "UNIT ON" light will flash an error code. Microprocessor Control Operation --This system is controlled by a microprocessor designed to give optimum levels of comfort and operating et_ciency. The control is located in the 40QN unit. To operate the unit, the factory- supplied remote controller is required. There are 9 (QNB systems) or 12 (QNE/H systems) operating modes (including the off mode) for the unit. Each mode operates as follows: • Off Mode --When the unit is in the Off mode, all functions (compressor, outdoor fan, indoor fan, and air sweep) are off, except the reversing valve (QNE/H only), which will stay deenergized if the unit was last operated in the Cooling mode. Air Circulation Mode (Fan Operation Only) --When Air Circulation mode is selected, the indoor fan will operate continuously in the selected speed (high, medium, low, or auto.). If the Auto. mode is selected, the indoor fan will operate at low speed. The compressor and outdoor fan are off. The reversing valve (QNE/H only) will remain in the last operating mode. Cooling Mode --When the Cooling mode is selected, the indoor fan will operate continuously at the selected speed if the speed is high, medium, or low. lfthe indoor fan is in Auto. mode, the fan will change operating speeds depending on the difference between the room temperature and the set point. The reversing valve (QNE/H only) will be energized. The compressor cannot ran for 3 minutes from the time the system starts up or for 3 minutes from the time the compressor last operated, when the temperature of the room is equal to or greater than the selected temperature, the compressor and outdoor fan will operate until the room temperature is 2 ° F below the set point, and then shut off. When the room temperature is less than the selected temperature, the compressor and outdoor fan re main off. • Maximum Dehumidification Mode --When the Dehumidification mode is selected, the indoor fan will operate continuously at the selected speed if the speed is high, medium, or low. If the indoor fan is in Auto. mode, the fan will change operating speeds depending on the room tamperature. If the room temperature is below the set point, the indoor fan will run at ultra-low speed, and the compressor could run for up to 4 minutes. (Ultra-low speed is a control-driven speed [not user configurable] used to sample the space when the fan would normally be off.) The reversing valve (QNE/H only) will be energized. The compressor cannot run for 3 minutes from the time the system starts up or for 3 minutes from the time the compressor last operated. Initial Operation --When the mode is first selected, one of the following occurs: 1. If the room temperature is above or equal to the selected temperature, the unit will operate for 16 minutes, and the compressor and outdoor fan will operate. The indoor fan will operate as in the Cooling mode. After 16 minutes of operation (or when the room reaches 2° F below set point), the unit switches to normal dehumidification operation. 2. If the room temperature is below the selected temperature, the unit will operate for 8 minutes as follows: the compressor and outdoor fan will operate for 3 minutes. The indoor fan will operate in low speed, and 30 seconds after the compressor stops, the indoor fan stops. The unit remains off for 1 minute, and then the indoor fan starts in ultra-low speed for 30 seconds. The unit then switches to normal dehumidification operation. Normal Operation --One of the following will take place: 1. when the temperature of the room is equal to or greater than the selected temperature (by not more than 3° F), the unit will operate for 8 minutes as follows: the compressor and outdoor fan will operate for 3 minutes. The indoor fan will operate in low speed, and 30 seconds after the compressor stops, the indoor fan stops. The unit remains off for 1 minute, and then the indoor fan starts in ultra-low speed for 30 seconds. The normal dehumidification operation is repeated for the newly sensed room temperature. 2. If the room temperature is equal to or greater than the selected temperature, but not by more than between 4 ° F and 6° F, the compressor and outdoor fan operate for 4 minutes. The indoor fan will run at ultra-low speed and 15 will stop30seconds stops.• ON/OFF Timer Mode --The ON/OFF timer will turn the afterthecompressorAfter 3 minutes,theindoorfanrunsatultra-lowspeedfor unit on or off at a user selectable on and off time (this is 30seconds.dehumidificationisre-one time event only). The unit will start in the same mode Thenormaloperationpeatedforthenewlysensedtemperature. and at the same selected temperature as when the system room 3.Whentheroomtemperaturetoorgreaterisequalthan 4°Fbelowtheselectedthesystem temperature,operates asfollows:Thecompressorfanoperate andoutdoorfor 3minutes.fanwilloperatespeed Theindooratultra-low andwillstop30secondsstops. afterthecompressorAf ter4or5minutes,fanstartsspeed...