Stealth SC-24CD-UM User manual

S IM CONCEA ED DUCT UNIT
OWNER’S MANUA
Outdoor Unit
SC-18ZUM
SC-24Z-UM
SC-36ZUM
SC-42Z-UM
SC-48Z-UM
Models:
Indoor Unit
SC-18CD-UM
SC-24CD-UM
SC-36CD-UM
SC-42CD-UM
SC-48CD-UM

ntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Operating nstructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22
Care and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting & Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . 24
Energy Saving Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back
Thank you for choosing a
Slim Concealed Duct
Air Conditioning & Heating System!
Please read this owner’s manual carefully before operation and retain it for
future reference.
Table of Contents

WARNING
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.
WARNING signifies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices which may result in minor personal
injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced installation,
reliability, or operation.
NOTE: Your actual air conditioning & heating system and related devices may differ
from the images shown in this manual.
Heat pumps, air conditioners & heating equipment should be installed, started up, and
serviced only by qualified installers and service technicians. Air conditioning, heat pumps
and refrigeration systems are hazardous due to high voltage electrical components,
high refrigerant pressures, and moving parts.

WARNING
4
SAFETY PRECAUTIONS
Please read the following before operation.
• Disconnect electrical power to the indoor and outdoor units before performing
any maintenance or cleaning.
•Do not attempt to repair the Stealth system yourself. ncorrect repairs may cause
electric shock or fire. Contact a qualified service technician for all service
requirements.
•Keep combustible materials away from the unit.
• Do not put hands or any objects into the air inlets or outlets. This may cause personal
injury or damage the unit.
• When cleaning, be careful not to splash water on the unit. Doing this may cause
electric shock or damage to unit.
CAUTION

5
System Schematic
Indoor Unit
System Components*
1. ndoor Power Supply
2. Electric Box
3. Communication Cable
4. Wired Tether Controller
5. Communication Cable
6. Front Panel
7. Service Cover
8. Liquid Pipe
9. Gas Pipe
10. Drain Hose
11. Outdoor Power Supply
Outdoor Unit
3
1
Air outlet
Air outlet
Air inlet
Air inlet
2
10 9 87 11 6
4
5
*
Not all items included in
equipment purchase

SYSTEM FUNCTIONS
WHISPER QUIET
Not only are the Stealth systems energy efficient but they are quiet too. Slim Concealed Duct
operates with sound levels starting as low as 28 dB(A).
MU TI 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.
BUI T IN CONDENSATE IFT PUMP
The indoor unit features a built-in drain pump that pumps condensate from the basepan to
the drain system.
CONDENSATE SENTRY
The unit’s fail-safe mechanism recognizes when there is a high level in the condensate pan
and shuts off the system to prevent overflow.
INTE IGENT PRE-HEATING
The Designer system guards against the annoying cool air blown into the room in heating
mode. The system constantly monitors the discharge air temperature. t will delay the indoor
fan until the indoor coil has warmed up to prevent blowing uncomfortable cool air into the
room.
TETHER CONTRO ER
The Stealth wired Tether Controller mounts to the wall up to 25 feet from the unit. t
provides complete control over your unit’s operation mode, desired temperature, fan speed,
airflow direction and more.
INTE IGENT DEFROST
The Designer ntelligent Defrost function increases room comfort and saves energy by
eliminating unnecessary defrost cycles. n 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.
n defrost mode the wired Tether Controller display will show "H1" and the indoor fan and
outdoor fan will turn off while the system removes frost from the outdoor coil. Once the frost
has been removed, the wired Tether Controller display shows room set point and the system
will revert back to normal heating operation.
6

8
SYSTEM FUNCTIONS
POWER FAI URE MODES
Power interruptions are no problem for the Designer system. User selections and system
parameters are stored in non-volatile memory. These parameters are retained during a
power failure. When power is returned, the slim duct system will automatically return to
the last operating mode. Or, the system can be set to power up in standby mode.
TURBO MODE
Use Turbo Mode for situations when you wish to achieve the desired room temperature in
the shortest possible time. This mode runs the unit at ultra high speeds for quickest results.
C OCK
Using the 24-hour clock feature, you can control each function in real time, for the most
user-friendly operation.
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.
DRY MODE
Select this mode to increase moisture removal during warm humid conditions. n Dry mode
the indoor fan will run at low speed during the cooling cycle. When setpoint is reached, the
indoor fan will turn off with the compressor.
TIMER MODE
The unit can be programmed to turn ON or OFF after a specific amount of time. The time period
is adjustable between one half and 24 hours.
S EEP 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 electric bills.
X-FAN MODE
When operating in humid areas, Designer has a Dry Coil function called X-Fan that will
allow the indoor fan to run for a pre-determined amount of time after the unit is turned off
(cooling or dry modes) to ensure that additional moisture is removed from coil.

SYSTEM FUNCTIONS
FAHRENHEIT °F / CE SIUS °C
The wired Tether Controller can be set to display in either °F or °C.
SE F-DIAGNOSIS
With an on-board computer using real-time diagnostics, the Stealth Designer system
helps to
prolong its own life. The automatic diagnosis feature continuously scans for unacceptable
operating conditions or malfunctions. f such conditions occur, the system takes corrective
action or stops. Error codes are shown on the unit display to facilitate easy troubleshooting
and repair.
PRIVACY OCK MODE
The wired Tether Controller has a Privacy Lock. The Privacy Lock averts unauthorized access
or tampering with system settings.
AGENCY ISTINGS
All systems are listed with AHR (Air conditioning, Heating, and Refrigeration nstitute) and
are ETL certified per UL Standards.
INTRODUCTION TO THE TETHER CONTRO ER
9
X-FAN

10
OPERATING INSTRUCTIONS
ON/OFF BUTTON
Press On/Off to turn On the unit. Press again to turn it Off.
MODE SETTING
When the unit is ON, press Mode button to select an operating mode. t will change
sequentially as shown below: Auto–Cool–Dry–Fan–Heat
“Off” State “On” State
Auto Cool Dry Fan Heat
F
F
F
TEMPERATURE SETTING
Press ▲or ▼to increase/decrease the setpoint temperature as shown below. n Cool, Dry,
Fan or Heat mode, the setpoint temperature range is 61°-86°F. n Auto mode, the setpoint
temperature is not adjustable.
F

OPERATING INSTRUCTIONS
FAN SETTING
When the unit is ON, press Fan button to select the fan speed of the indoor unit.
t will change sequentially as shown below.
11
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. To
cancel, press the Function button to re-enter the Turbo setting status, then press Enter/Cancel.
F
F
F
Turn On the unit and select Heat or Cool mode. Press Enter/Cancel to start Turbo mode.
To cancel, press Function button to re-enter
the Turbo settings, then press Enter/Cancel button.
Press Function until Turbo mode con is displayed.
Cancel Turbo Mode
F

12
OPERATING INSTRUCTIONS
TIMER SETTING
The Designer 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.
Set the time period for the unit to remain OFF before turning ON by pressing the ▲ or ▼
buttons. Press Timer button to confirm and start Timer-On mode.
F F F
FF
Turn Off the unit. Press Timer button to select Timer On mode.
Press ▲or▼to select time period.
Timer modes can be cancelled anytime
by pressing the Timer button.
Cancel Timer
F
Press Enter/Cancel to start timer mode.

13
OPERATING INSTRUCTIONS
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 F F
FF
Turn On the unit and select Heat
or Cool mode.
Press Timer button to select Timer Off mode.
Press ▲or▼to select time period.
Timer modes can be cancelled anytime
by pressing the Timer button.
Cancel Timer
F
Press Enter/Cancel to start timer mode.

S EEP 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:
f setpoint is between 61℉to 73℉, temperature will slowly increase 2℉per hour for 3 hours,
then maintain this setpoint for 4 hours, then reduce setpoint by 2℉and hold at this setpoint
until Sleep Mode is cancelled.
f setpoint is between 74℉to 81℉, temperature will slowly increase 2℉per hour for 2 hours,
then maintain this setpoint for 5 hours, then reduce setpoint by 2℉and hold at this setpoint
until Sleep Mode is cancelled.
f setpoint is between 82℉to 85℉, temperature will slowly increase 2℉ per hour for 1 hour,
then maintain this setpoint for 6 hours, then reduce setpoint by 2℉and hold at this setpoint
until Sleep Mode is cancelled.
f setpoint is 86℉, unit will run at this setpoint for 7 hours, then reduce setpoint by 2℉and
hold at this setpoint until Sleep Mode is cancelled.
In Heat mode:
f setpoint is between 82 ℉to 86℉, the unit will slowly reduce setpoint by 2℉per hour for
3 hours, and then maintain this setpoint until Sleep Mode is cancelled.
f setpoint is between 69 ℉to 81℉, the unit will slowly reduce setpoint by 2℉per hour for
2 hours, and then maintain this setpoint until Sleep Mode is cancelled.
f setpoint is between 63℉to 68℉, the unit will reduce setpoint by 2℉, and then maintain
this setpoint until Sleep Mode is cancelled.
f setpoint is 62℉, the unit will run at this setpoint until Sleep Mode is cancelled.
14
Cooling Mode Heating Mode
OPERATING INSTRUCTIONS

15
OPERATING INSTRUCTIONS
Sleep Setting
Turn the unit On and select a mode (ex. Heat, Cool, or Dry). Press the Function button until
the Sleep icon appears on the display. Press the Enter/Cancel button to start Sleep Mode.
F
FF
F
Turn On the unit and select a mode. Press Function until the Sleep icon is displayed. Press Enter/Cancel to start Sleep Mode.
Cancel Sleep Mode
Press Function until the Sleep icon appears.
Press the Enter/Cancel button to cancel Sleep Mode.

FFF
16
OPERATING INSTRUCTIONS
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.
Press Function until the X-fan icon is displayed. Press Enter/Cancel to start X-fan
mode.
Cancel X-Fan Mode
To cancel, press Function button to re-enter the
X-Fan settings, then press Enter/Cancel button.

OPERATING INSTRUCTIONS
I-FEE MODE
The indoor unit will sense room temperature at the wired Tether Controller instead of at the
return air section of the indoor unit.
I-Feel Settings
Press the Function button until the -Feel icon is displayed, then press Enter/Cancel to
activate the function.
17
F
Turn Unit On. Press Function until the -Feel icon is displayed. Press Enter/Cancel to start -Feel
mode.
To cancel, press Function button to re-enter the
-Feel settings, then press Enter/Cancel button.
Cancel I-Feel Mode
Indoor Unit Room Sensor A
Tether Controller Indoor Room Sensor B

OPERATING INSTRUCTIONS
FREEZE GUARD MODE
The unit will automatically maintain the room temperature above 46º F. This setpoint
temperature is not adjustable. Freeze Guard Mode can only be selected with the unit in Heat
Mode. Fan speed selection will be not be allowed; the unit will automatically select the proper
fan speed for the room conditions.
Freeze Guard Setting
n Heat mode, press Function until the Freeze Guard icon is displayed. Press Enter/Cancel
button to activate.
To deactivate, press Function to select“Freeze Guard”setting status. Then press Enter/Cancel until
the flashing “Freeze Guard”symbol disappears.
18
FF
Cancel Freeze Guard Mode
To cancel, press Function button to re-enter the
Freeze Guard settings, then press Enter/Cancel button.
Turn Unit On and select Heat Mode. Press Function until the
Freeze Guard icon is displayed.
Press Enter/Cancel to start Freeze Guard mode.

Setup and Configuration Modes
INDOOR FAN MODE
The unit has two selectable indoor fan operating modes:
Mode 0 (Factory default setting): The indoor fan will run continuously, except in heat mode,
where the indoor fan will continue to run for 60 seconds after room temperature reaches setpoint.
Mode 1: The indoor fan will turn Off 10 seconds after the room temperature reaches
setpoint, regardless of the mode.
Indoor Fan Mode Setting
Turn the unit Off, Press the Function and Timer buttons simultaneously for 5 seconds until 00
is displayed on the temperature display. Press Mode button until 05 is displayed. Then press
▲and ▼buttons to select the desired indoor fan mode ( ‘00' for Mode 0 or '01' for Mode 1).
Press Enter/Cancel button to activate.
OPERATING INSTRUCTIONS
19
F
F
Cancel Indoor Fan Mode
To cancel, press Enter/Cancel button
and quit from the interface.
Turn Unit Off. Simultaneously, press Function and Timer
buttons for 5 sec until '00' is displayed.
Press ▲or ▼button to select
an indoor fan mode.
Press Enter/Cancel to activate.
Press Mode button until “05” is shown
on the temperature display area.
F

Outdoor
Fresh Air
Fresh Air
Indoor Side
Air Valve
Air Intake Pipe Air Supply Pipe
OPERATING INSTRUCTIONS
OUTDOOR AIR MODE
The Outdoor Air Mode can be used when a field supplied outdoor air damper is connected to the
Slim Duct unit or ductwork. The Outdoor Air Mode controls the outdoor air entering the system.
Outdoor Air Setting
When the unit is ON, press Function until the A R icon is displayed. Press ▲and ▼to select
the outdoor air damper run time (see table below).
F
F
20
A R CODE 1 2 3 4 5 6 7 8 9 10
Air Damper
6-ON 12-ON 18-ON 24-ON 30-ON 36-ON 42-ON 48-ON 54-ON 60-ON
Run Time 54-OFF 48-OFF 42-OFF 36-OFF 30-OFF 24-OFF 18-OFF 12-OFF 6-OFF 0-OFF
Damper Run Time Table (Minutes)
F
FF
Cancel Outdoor Air Mode
To cancel, press Function button to re-enter the
Outdoor Air Mode settings, then press Enter/Cancel button.
Turn Unit On.
Press Function until the Air icon is displayed.
Press Enter/Cancel button to activate
Outdoor Air Mode.
Press ▲or ▼button to select
damper run time.

OPERATING INSTRUCTIONS
CE SIUS OR FAHRENHEIT TEMPERATURE DISP AY
The wired Tether Controller is set from the factory to display
temperature in Fahrenheit (Fº). f Celsius (Cº) is desired, turn
the unit OFF, press Mode and ▼buttons at the same time
for 5 seconds to alternate between temperature displays.
TEMPERATURE DISP AY MODE
The wired Tether Controller may display either room temperature sensed at the system, room
temperature sensed at the Tether Controller, or return air temperature sensed at the indoor unit.
Temperature Display Setting
To set the Tether Controller temperature display, turn unit Off. Press Function and Timer buttons
simultaneously for 5 sec. The temperature display will show 00. Press the Mode button to
select the Display Code (see table below) for the desired temperature display. Press Enter/
Cancel button to save the setting.
PRIVACY OCK
The Privacy Lock prevents unauthorized access to the unit
controls and prevents tampering with system settings. To
lock the wired Tether Controller, press ▲and ▼ buttons
simultaneously for 5 seconds and the Lock con will be displayed.
Repeat the process to unlock the Tether Controller and
cancel Privacy Lock.
21
F
F
Press Function & Timer buttons
simultaneously 5 sec until 00 is displayed.
Press Mode button to
select display mode.
Press Enter/Cancel button to
save setting.
To activate Privacy Lock.
TEMPERATURE DISP AY MODE
Return air temperature sensed at the return air inlet.
ndoor ambient temperature sensed at the wired Tether Controller.
Return air temperature sensed at the return air inlet during Cool, Dry and Fan modes. During Heat and
Auto modes, display the indoor ambient temperature sensed at the wired Tether Controller.
ndoor ambient temperature sensed at the wired Tether Controller during Cool, Dry and Fan modes.
Return air temperature sensed at the return air inlet during Heat & Auto modes.
Factory Default Setting
DISP AY CODE
01
02
03
04
To change temperature display.