CEILING CASSETTE OWNER’S MANUAL Models: CAS12HP230V1AC CAS18HP230V1AC CAS24HP230V1AC
Thank you for choosing a Multi21 Ceiling Cassette Air Conditioning & Heating System! You can feel confident in your selection because the same pride in craftsmanship and engineering knowledge that goes into millions of other Gree installed products worldwide has gone into your unit. Please read this owner’s manual carefully before operation and retain it for future reference. Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION Superior Design for Superior Performance Gree’s discreet Multi21 Ceiling Cassette provides low-noise performance through design and innovation. The Ceiling Cassette is a one-stop solution for heating and air conditioning large and small rooms. This flexible climate solution conveniently disappears above the surface of any room’s drop ceiling.
NOMENCLATURE Example: CAS18HP230V1AC CAS 18 Series Designation CAS - Ceiling Cassette Cooling Capacity 12 - 12,000 BTUH 18 - 18,000 BTUH 24 - 24,000 BTUH HP 230V 1 A C Product Type S - System O - Outdoor units H - Indoor High Wall D - Indoor Duct C - Indoor Cassette F - Indoor Floor/Ceiling Revision Level Style/Color Designation Model Type AC - Cooling Only HP - Heat Pump HC - Heat/Cool Electrical Rating 230V - 208/230V 60Hz 1PH 115V - 115V 60Hz 1PH 3
SAFETY PRECAUTIONS Please read the following before operation. Recognize safety information. This is the safety-alert symbol. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death.
SYSTEM PARTS 1 2 Indoor unit 3 4 Air outlet 5 Air inlet Part Name 1. Power Supply and Communication Wires 2. Drain Pipe 3. Liquid Pipe 4. Decorative Discharge Air Grille (sold separately) 5. Gas Pipe 6. Wired Tether Controller 7. Remote Controller 8. Service Cover 9. Power Supply and Communication Wires 10. Front Panel 11. Outdoor Power Supply 12. Liquid Pipe 13. Gas Pipe 14.
SYSTEM FUNCTIONS WHISPER QUIET Not only are the Gree systems energy efficient but they are quiet too. Ceiling Cassette operates with sound levels starting as low as 37 dB(A). MULTI FAN SPEEDS Whether operating in either Cooling or Heating mode, the indoor fan can be set to your choice of three different speeds (Low, Medium or High) to achieve maximum comfort.
SYSTEM FUNCTIONS INTELLIGENT DEFROST The Intelligent Defrost function increases room comfort and saves energy by eliminating unnecessary defrost cycles. In heating mode, the unit will monitor the outdoor coil for frost buildup. Once frost buildup has been detected, the system will switch into a defrost mode to remove the frost. I FEEL MODE The unit will sense room temperature at the remote controller instead of at the indoor unit.
SYSTEM FUNCTIONS MODE BUTTON The unit can be set to five different operating modes: HEAT, COOL, DRY, FAN ONLY and AUTO. NOTE: AUTO MODE has fixed setpoints of 68° F heating and 77° F cooling, which are not adjustable. The system will automatically select heating or cooling to maintain room temperature within this band. SLEEP MODE The unit will automatically adjust room temperature during your sleep time.
OPERATION OF WIRELESS REMOTE CONTROLLER Remote Controller 1 3 2 5 6 8 9 11 14 4 7 10 12 13 Part Name 1. ON/OFF Button 2. Down Button 3. Up Button 4. Fan Button 5. Mode Button 6. I Feel Button 7. Clock Button 8. Timer On Button 9. Swing Louver Button 10. X-Fan Button 11. Timer Off Button 12. Turbo Button 13. Sleep Button 14.
OPERATION OF WIRELESS REMOTE CONTROLLER REMOTE CONTROLLER OPERATIONS The wireless remote controller is sleek, versatile and allows you to change room temperatures and functions on your Multi21 Ceiling Cassette system from the palm of your hand. The large LCD display and buttons make it easy-to-understand and easy-to-use. The remote controller is set from factory to display temperatures in °F.
OPERATION OF WIRELESS REMOTE CONTROLLER MODE BUTTON Use the “MODE” button to select one of the available modes. The selected mode will be displayed on the remote controller and the appropriate light will illuminate on the front display panel. AUTO – Unit will automatically select heating or cooling to maintain room temperature between 68°F and 77°F. The remote controller will display the Auto Mode icon with no setpoint.
OPERATION OF WIRELESS REMOTE CONTROLLER TIMER SETTING Timer-ON / Timer-OFF BUTTON To set when you want the unit to turn On at the end of a selected time period, use the button labeled “Timer-ON /Timer-OFF”on the remote controller. Press this button to make the clock icon disappear, replaced with the word “ON” (blinking). Press or buttons to adjust timer setting 1 minute at a time. Press and hold or button to set timer more quickly.
OPERATION OF WIRELESS REMOTE CONTROLLER FAN BUTTON Press the FAN button to adjust the indoor fan speed: Low ( ), Medium ( ), High ( ), Turbo and Auto. • Turbo function is not available in Dry and Auto mode. • The fan operates at low speed in Dry and Auto modes, and the speed cannot be adjusted. • When Auto is selected, the unit will select the proper fan speed automatically, according to the ambient temperature. NOTE: Turbo function is not available in Dry and Auto Modes.
OPERATION OF WIRELESS REMOTE CONTROLLER SLEEP MODE The Multi21 Ceiling Cassette system will automatically adjust room temperature during your sleep time. This slight change in temperature will not affect your comfort level due to the natural effects that sleeping has on the body, but it will save on energy consumption and will lower your electric bill. Press the SLEEP button to select Sleep mode or Cancel. The SLEEP icon will appear.
OPERATION OF WIRELESS REMOTE CONTROLLER CHANGING BATTERIES AND ADDITIONAL NOTES To change batteries, slide cover off battery compartment on back of remote controller. Remove and safely discard old batteries. Insert two new AAA 1.5V dry batteries, using correct polarity. Reattach back cover. NOTE: • If the remote controller will not be used for a long time, remove batteries to prevent leakage damage. • Be sure to aim the remote controller at the receiver of the main unit when operating.
OPERATION OF WIRED TETHER CONTROLLER ON/OFF BUTTON Press On/Off to turn On the unit. Press again to turn it Off. F F “Off” State “On” State MODE SETTING When the unit is ON, press Mode button to select an operating mode. It will change sequentially as shown below: Auto–Cool–Dry–Fan–Heat Auto Cool Dry Fan Heat F TEMPERATURE SETTING Press ▲ or ▼ to increase/decrease the setpoint temperature as shown below. In Cool, Dry, Fan or Heat mode, the setpoint temperature range is 61°-86°F.
OPERATION OF WIRED TETHER CONTROLLER FAN SETTING When the unit is ON, press Fan button to select the fan speed of the indoor unit. It will change sequentially as shown below. Auto Low Medium High F TURBO MODE Turbo mode will force the unit up to maximum capacity to heat or cool the room in the shortest amount of time. Turbo Mode can only be used on Heat or Cool modes. Turbo Setting Press Function button until the Turbo icon is displayed. Then press Enter/Cancel to confirm.
OPERATION OF WIRED TETHER CONTROLLER TIMER SETTING The Multi21 System has two timer modes. The Timer-On mode will turn the unit ON after the preset time period. The Timer-Off Mode will turn the unit OFF after the preset time period. The preset time period can be from 0.5 to 24 hours in 0.5 hour increments. Timer-On Setting Turn the unit Off, press the Timer button. The OFF icon will flash and the hours will be displayed.
OPERATION OF WIRED TETHER CONTROLLER Timer-Off Setting Turn the unit On, press the Timer button. The ON icon will flash and the hours will be displayed. Set the time period for the unit to remain ON before turning OFF by pressing the ▲ or ▼ buttons. Press Timer button to confirm and start Timer-Off mode. F Turn On the unit and select Heat or Cool mode. F Press Timer button to select Timer Off mode. F F Press ▲or▼ to select time period. F Press Enter/Cancel to start timer mode.
OPERATION OF WIRED TETHER CONTROLLER SLEEP MODE The unit will automatically adjust room temperature during your sleep time. This slight change in temperature will not affect your comfort level due to the natural effects that sleeping has on the body, but it will save on energy consumption and will lower your electric bill. Press the SLEEP button to select Sleep Mode. The SLEEP icon will appear. In Cool or Dry modes: The unit will run at current room setpoint for 1 hour.
OPERATION OF WIRED TETHER CONTROLLER X-FAN MODE The X-Fan function may only be selected in Cool and Dry modes. After the unit is turned Off, the X-Fan function will keep the indoor fan running for 2 minutes to dry the indoor evaporator coil to help avoid mold and mildew growth. X-Fan Settings Turn the unit On and select Cool or Dry mode. Press Function button until X-fan icon is displayed and then press Enter/Cancel to activate this function. F Turn On the unit, select Cooling or Dry mode.
OPERATION OF WIRED TETHER CONTROLLER I-FEEL MODE The indoor unit will sense room temperature at the wired Tether Controller instead of at the return air section of the indoor unit. Indoor Unit Room Sensor A Tether Controller Indoor Room Sensor B I-Feel Settings Press the Function button until the I-Feel icon is displayed, then press Enter/Cancel to activate the function. F Turn Unit On. Press Function until the I-Feel icon is displayed. Press Enter/Cancel to start I-Feel mode.
OPERATION OF WIRED TETHER CONTROLLER POWER FAILURE MODES The unit has two selectable system power up modes: IMPORTANT: This mode arrives set at “factory default,” but should not be left there. It must be reset to “Power Failure Recovery,” especially for use in commercial IT/server/computer rooms. Power Failure Recovery After the initial power up, the unit will store user selections and system parameters in non-volatile memory. These parameters are retained during a power failure.
OPERATION OF WIRED TETHER CONTROLLER CELSIUS OR FAHRENHEIT TEMPERATURE DISPLAY F The wired Tether Controller is set from the factory to display temperature in Fahrenheit ( Fº). If Celsius (Cº) is desired, turn the unit OFF, press Mode and ▼ buttons at the same time for 5 seconds to alternate between temperature displays. To change temperature display. PRIVACY LOCK The Privacy Lock prevents unauthorized access to the unit controls and prevents tampering with system settings.
CARE AND CLEANING Routine maintenance consists of checking the condensate drain for clogs, hosing off the outdoor coil of outdoor unit and cleaning the air filter and the indoor decorative grille. WARNING Turn off power and disconnect from indoor and outdoor units before cleaning. Failure to do so could cause electric shock. DECORATIVE GRILLE CLEANING Wash the decorative grille using warm water and mild detergent with a soft cloth or soft brush.
CARE AND CLEANING For the 12 and 18K cassette unit: 1. Remove screws with a screwdriver as shown. 2. Release the two fasteners and open the panel grille. Remove the screw Push the fastener Disassemble the air inlet grille: 1. Open the air inlet grille at 45°, lift up and remove the grille. 2. Disassemble the filter screen and remove it from the filter door. HOW TO CLEAN AIR FILTER 1. Clean dust, lint and dirt from the air filter using a vacuum cleaner or washing with water.
TROUBLESHOOTING PROBLEM CAUSE/SOLUTION System does not restart. Cause: The system has a built-in three-minute delay to prevent short and/or rapid cycling of the compressor. Solution: Wait three minutes for the protection delay to expire. Indoor unit emits unpleasant odor when started Cause: Typically unpleasant odors are the result of mold or mildew forming on the coil surfaces or the air filter. Solution: Wash indoor air filter in warm water with mild cleaner.
TROUBLESHOOTING PROBLEM CAUSE/SOLUTION Water leaking from the indoor unit into the room. Cause: While it is normal for the system to generate condensate water in cooling mode, it is designed to drain this water via a condensate drain system to a safe location. Solution: If water is leaking into the room, it may indicate one of the following. • The indoor unit is not level right to left. Level indoor unit. • The condensate drain pipe is restricted or plugged.
DIAGNOSTIC CODES Troubleshooting The unit has onboard diagnostics. The outdoor unit will provide status indicators. The indoor wall unit and remote controller will display error codes.
DIAGNOSTIC CODES Malfunction Name Indoor Unit Display Outdoor Unit Indicators Yellow Red Possible Causes High Temperature Resistant Protection E8 1) Incorrect refrigerant charge level 2) Refrigerant metering device malfunction 3) Compressor malfunction Cold Air Protection E9 EEPROM Memory Malfunction EE Module Phase Current Protection Frequency Decrease/Limit Mode En Module Temperature Protection Frequency Decrease/Limit Mode EU 11 flashes and 1 sec Off 1) IPM module over heating or malfu
DIAGNOSTIC CODES Indoor Unit Display Outdoor Unit Indicators High Compressor Discharge Temperature - Frequency Decrease/Limit Mode F9 2 flashes and 4 flashes 1 sec Off and 1 sec Off Indoor Coil Freeze Protection Frequency Decrease/Limit Mode FH Pump Down or Gathering Refrigerant Status Fo Defrost Mode in Heating H1 Compressor Overload Protection H3 8 flashes and 1 sec Off 1) Wiring terminal OVC-COMP is loose 2) Refer to the malfunction analysis in Service Manual IPM Module Protection H5 4
DIAGNOSTIC CODES Malfunction Name Indoor Unit Display Outdoor Unit Indicators Yellow Possible Causes Red 16 flashes and 1 sec Off Incompatible Indoor and Outdoor Units LP Compressor Phase Current Protection P5 1) IPM module malfunction 2) Outdoor control board malfunction 3) Compressor malfunction Module Temperature Sensor Malfunction P7 Outdoor control board malfunction Module Temperature Protection P8 1) Lack of thermal grease on IPM module 2) Heat sink (radiator) not tightly mounted 3)
ENERGY SAVING TIPS 1. Relaxing room temperature at night is OK: During the nighttime hours you don't require the same level of conscious cooling or heating. Try using Sleep Mode to gradually relax room temperature and allow the unit to run less and save energy. 2. Curtains and shades: In the summer, you need to block the effects of the sun. Close window curtains and shades on the south and west side of your home to help block solar heat. In winter, the sun is your friend.
$ GREE LIMITED WARRANTY STATEMENT FOR WARRANTY SERVICE OR REPAIR: Contact your installing contractor. You may find the installer’s name on the equipment or in your Owner’s packet or on your invoice. ONLINE REGISTRATION IS AVAILABLE AT: www.greecomfort.com/resources/ product-warranty/ Or complete product registration below: Email completed form* to: service@twclimate.com or Send copy of completed form* to: Gree Warranty Registration 14610 Breakers Dr.
