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operation. Your heat pump is designed to automatically melt the ice. When in this defrost cycle, it is normal for steam or SAFETY CONSIDERATIONS fog to rise from the outdoor unit. Do not be alarmed! Note to Installer:This manual should be left with the equipment user. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of these or any other appliances. Failure to follow this warning could result in fire, serious injury, or death. Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system which has been under water. Failure to follow this warning could result in electrical shock, fire, serious injury, or death. Before performing recommended maintenance, be sure the main power switch to unit is turned off and lockout tag installed. Electric shock could cause serious injury or death. C990064 STARTING OR SHUTTING UNITS OFF 1. To start either of these units: a. Turn on the electrical power supply to unit. b. Select temperature and set SYSTEM switch or MODE control to desired mode. 2. To shut this unit off: NOTE: If the unit is being shut down because of a malfunction, call your dealer as soon as possible. a. Set system SWITCH or MODE control to OFF. b. Turn off the electrical power supply to unit and install lockout tag. OPERATING YOUR HEAT PUMP The operation of your heat pump system is controlled by the indoor thermostat. You simply adjust the thermostat and it maintains the indoor temperature at the level you select. Most thermostats of heat pump systems have 3 controls: a temperature control selector, a FAN control, and a SYSTEM or MODE control. Refer to your thermostat owner’s manual for more information. To better protect your investment and to eliminate unnecessary service calls, familiarize yourself with the following facts: 1. During heating, increasing the thermostat setting more than 2°F/1.1°C may cause the supplemental heaters to be turned on for a short period of time to satisfy the thermostat. Needless use of the supplementary heat reduces potential energy savings. Fig. 1—Unit 50JZ (50Hz) Step 1—Cooling Mode With the SYSTEM or MODE control set to COOL, your heat pump will run in cooling mode until the indoor temperature is lowered to the level you have selected. On extremely hot days, your heat pump will run for longer periods at a time and have shorter “off” periods than on moderate days. Step 2—Heating Mode With the SYSTEM or MODE control of your indoor thermostat set to HEAT, your heat pump will run in heating mode until room temperature is raised to the level you have selected. Of course, your heat pump will run for longer periods to maintain a comfortable environment on cooler days and nights than on moderate ones. Step 3—Supplemental Heat Your heat pump 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 in order to maintain the level of comfort you have selected. When your heat pump needs additional heat to keep you comfortable, your Carrier electronic thermostat will turn on the supplemental heat (if equipped) and display the “AUX HT” message. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 4 PC 101 Catalog No. 005–00009 Printed in U.S.A. Form OM50-C2 Pg 1 2–02 Replaces: New Tab 6a 8a Table 1—Indoor-Air Filter Data UNIT SIZE 50JZ (50HZ) 024 030 036 048 060 RETURN-AIR FILTERS (mm.) Throwaway 20” x 20” (508 x 508) 20” x 20” (508 x 508) 20” x 24” (508 x 609.6) 24” x 30” (609.6 x 762) 24” x 30” (609.6 x 762) Step 4—Defrost Mode When your heat pump is providing heat to your home or office and the outdoor 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 absorbed from the outside air. So, to maintain energy-efficient operation, your heat pump has an automatic defrost mode. The defrost mode starts at a preset time interval of 30 minutes, although, it may be reset to 60, 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, these units automatically switch 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 ...