Carrier 50JZ Series Manual To Operating And Maintaining

Also see for 50JZ024: Installation and operating instructions Guide to operating and maintaining Guide to operating and maintaining Product data Product data

50JZSingle-Package Electric Heat Pump Unitwith Puron® (R-410A) RefrigerantA Guide To Operating and Maintaining YourSingle-Package Electric Heat Pump UnitNOTE TO INSTALLERThis manual should be left with the equipment owner.Do not store or use gasoline or other flammable vapors andliquids in the vicinity of this or any other appliance. Failure tofollow this warning could result in fire, serious injury, ordeath.Do not use this unit if any part has been under water.Immediately call a qualified service technician to inspect theunit and to replace any part of the control system which hasbeen under water. Failure to follow this warning could resultin electrical shock, fire, serious injury, or death.Before performing recommended maintenance, be sure themain power switch to unit is turned off. Electric shock couldcause serious injury or death.TO START UNIT1. Turn on the electrical power supply to unit.2. Select temperature and set SYSTEM switch or MODE controlto desired mode.TO SHUT UNIT OFFIf unit is being shut down because of a malfunction, call yourdealer as soon as possible.1. Set system SWITCH or MODE control to OFF.2. Turn off the electrical power supply to unit.OPERATING YOUR HEAT PUMP UNITThe operation of your heat pump system is controlled by theindoor thermostat. You simply adjust the thermostat and itmaintains the indoor temperature at the level you select. Mostthermostats for heat pump systems have 3 controls: a temperaturecontrol selector, a FAN control, and a SYSTEM or MODE control.Refer to your thermostat owner’s manual for more information.Step 1—Cooling ModeWith the SYSTEM or MODE control set to COOL, your heatpump will run in cooling mode until the indoor temperature islowered to the level you have selected. On extremely hot days,your heat pump will run for longer periods at a time and haveshorter "off" periods than on moderate days.Step 2—Heating ModeWith the SYSTEM or MODE control of your indoor thermostat setto HEAT, your heat pump will run in heating mode until roomtemperature is raised to the level you have selected. Of course,your heat pump will have to operate for longer periods to maintaina comfortable environment on cooler days and nights than onmoderate ones.Step 3—Supplemental HeatYour heat pump is your primary heating source. Your system mayalso be equipped with a supplemental heating source such aselectrical heat. On cold days and nights, your system will auto-matically turn on the supplemental heat in order to maintain thelevel of comfort you have selected.When your heat pump needs additional heat to keep you comfort-able, your Carrier electronic thermostat will turn on the supple-mental heat (if equipped) and display the "AUX HT" message.Step 4—Defrost ModeWhen your heat pump is providing heat to your home or office andthe outdoor temperature drops below 45 °F, moisture may begin tofreeze on the surface of the coil. If allowed to build up, this icewould impede airflow across the coil and reduce the amount ofheat absorbed from the outside air. So, to maintain energy-efficientoperation, 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 willstart at the preset time only if the ice is sufficient to interfere withnormal heating operation.After the ice is melted from the coil, or after a maximum of 10minutes in defrost mode, the unit automatically switches back tonormal heating operation.Do not be alarmed if steam or fog appears at the outdoor unitduring defrost mode. Water vapor from the melting ice maycondense into a mist in the cold outside air.During certain weather conditions such as heavy snow andfreezing rain it is not uncommon for ice to build up on the unitgrille. This is normal for these weather conditions. Do not attemptFig. 1—Unit 50JZVisit www.carrier.comManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 4Tab 5a 5a PC 101 Catalog No. 565-070 Printed in U.S.A. Form OM50-29 Pg 1 8-00 Replaces: New

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