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2. Ice or frost tends to form on the coil during winter heating operation. Your unit is designed to automatically melt the ice. When in this defrost cycle, it is normal for steam or fog to rise from the outdoor unit, and for water to drain from the outside of unit. Do not be alarmed! To start the unit: 1. Turn on the electrical power supply to unit. 2. Set MODE control to desired mode and select temperature. To shut off unit: Note: If the unit is being shut down because of a malfunction, call your dealer as soon as possible. 1. Set system MODE control to OFF. 2. Turn off the electrical power supply to unit. Cooling Mode With the SYSTEM or MODE control set to COOL, your unit will run in cooling mode until the indoor temperature is lowered to the level you have selected. On extremely hot days, your unit will run for longer periods at a time and have shorter “off” periods than on moderate days. Heating Mode With the SYSTEM or MODE control set to HEAT, your unit will run in heating mode until the room temperature is raised to the level you have selected. Of course, your unit will run for longer periods to maintain a comfortable environment on cooler days and nights than on moderate ones. Supplemental Heat Your unit is your primary heating source. Your system may also be equipped with a supplemental heating source such as electric heat. On cold days and nights, your system will automatically turn on the supplemental heat, as needed, in order to maintain the level of comfort you have selected. When your heat pump needs additional heat to keep you comfortable your thermostat will turn on the supplemental heat (if equipped). Defrost Mode When your unit is providing heat to your homeor officeand theoutdoor temperature drops below 45°F(7.2°C), moisture may begin to freeze on the surface of the coil. If allowed to build up, this ice would impede airflow across the coil and reduce the amount of heat ab 2 sorbed from the outside air. So, to maintain energy- --efficient operation, your unit has an automatic defrost mode. The defrost mode starts at a preset time interval of 60 minutes, although, it may be reset to 30, 90 or 120 minutes. Defrost will start at the preset time only if the ice is sufficient to interfere with normal heating operation. After the ice is melted from the coil, or after a maximum of 10 minutes in defrost mode, the unit automatically switches back to normal heating operation. Do not be alarmed if steam or fog appears at the outdoor unit during defrost mode. Water vapor from the melting ice may condense into a mist in the cold outside air. During certain weather conditions such as heavy snow and freezing rain it is not uncommon for ice to build up on the unit grille. This is normal for these weather conditions. Do not attempt to remove the ice from the unit grille. This condition will not affect the proper function of the unit and will clear within a few days. Emergency Heating Mode In the event of primary unit heat failure, the emergency heat mode allows your supplemental heating source to keep your home or office warm until your unit can be serviced. Contact your dealer in the event of primary unit heat failure. MAINTENANCE AND SERVICE This section discusses maintenance that should be performed by your dealer and care you, as the owner, may wish to handle for your new unit. Routine Maintenance All routine maintenance should be handled by skilled, experienced personnel. Your dealer can help you establish a standard procedure. To assure proper functioning of the unit, flow of condenser air must not be obstructed from reaching the unit. Clearance from the top of the unit is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm) is required on sides except the power entry side (42 in. clearance) (1067 mm) and the duct side (12 in. minimum clearance) (305 mm). Maintenance and Care for the Equipment Owner Before proceeding with those things you might want to maintain yourself, please carefully consider the following: ! WARNING FIRE, EXPLOSION, ELECTRICAL SHOCK, CUT HAZARD Failure to follow this warning could result in personal injury, death or property damage. 1. TURN OFF ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE AND INSTALL A LOCK- -- OUT TAG. 2. When removing access panels or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit. Air Filters The air filter(s) should be checked every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty filters produce excessive stress on the blower motor and can cause the motor to overheat and shut down. This unit must have an air filter in place before it can be operated. These filters should be located in at least one of two places. In many applications, the installer will provide return air filter grilles mounted on the wall or ceiling of the c...