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DUCTLESS SPLIT SYSTEM AC UNITS Section 15865 15-1207 F. Indoor Unit Coil: 1. The evaporator coil shall be of nonferrous construction with pre -coated aluminum strake fins on copper tubing. The multi -angled heat exchanger shall have a modified fin shape that reduces air resistance for a smoother, quieter airflow. All tube joints shall be brazed with PhosCopper or silver alloy. The coils shall be pressure tested at the factory. A condensate pan and drain shall be provided under the coil. G. Indoor Unit Electrical: 1. The electrical power of the unit shall be 208 volts or 230 volts, 1 phase, 60 hertz. a. The system shall be capable of satisfactory operation within voltage limits of 198 volts to 253 volts. 2. The power to the indoor unit shall have an option of being supplied from the outdoor unit, using Mitsubishi Electric A -Control system or separate power source for indoor and outdoor units. H. Unit Control: The control system shall consist of two (2) microprocessors, one on each indoor and outdoor unit, interconnected by a single non -polar two -wire cable. 2. Field wiring shall run directly from the indoor unit to the wall mounted controller with no splices. a. For A -Control, a three (3) conductor 14 ga. AWG wire with ground shall provide power feed and bi-directional control transmission between the outdoor and indoor units. b. Where separate power is supplied to the indoor and outdoor units, a two (2) 20 ga. AWG wire shall be run between the units to provide forbid - directional control communication. 3. The system shall be capable of automatic restart when power is restored after power interruption. The system shall have self -diagnostics ability, including total hours of compressor run time. Diagnostics codes for indoor and outdoor units shall be displayed on the wired controller panel. 4. The microprocessor located in the indoor unit shall have the capability of monitoring return air temperature and indoor coil temperature, receiving and processing commands from the wired controller, providing emergency operation and controlling the outdoor unit. 5. The indoor unit shall be connected to a wall mounted wired controller to perform input functions necessary to operate the system. a. The wired controller shall have a large multi -language DOT liquid crystal display (LCD) presenting contents in eight (8) different languages, including English, French, Chinese, German, Japanese, Spanish, Russian, and Italian. b. There shall be a built-in weekly timer with up to eight pattern settings per day. C. The controller shall consist of an On/Off button, Increase/Decrease Set Temperature buttons, a Cool/Dry/Fan mode selector, a Timer Menu button, 4