Bryant 538MNQ, 538MAC, 538MAQ, 538MNC, 619MNQ User Manual

...

538MAC / 619MAC, 538MAQ / 619MAQ SIZES 009--012 538MNC / 619MNC, 538MNQ / 619MNQ SIZES 012--024 HIGH--WALL DUCT--FREE SPLIT SYSTEM

Owner’s Manual

TABLE OF CONTENTS

PAGE

SAFETY PRECAUTIONS 2.....................................................................................

GENERAL 2.................................................................................................

PART NAMES 3..............................................................................................

DISPLAY PANELS 4..........................................................................................

REMOTE CONTROL 5........................................................................................

REMOTE CONTROL FUNCTIONS 6--8..........................................................................

CLEANING, MAINTENANCE AND TROUBLESHOOTING 9 -- 10....................................................

NOTE TO EQUIPMENT OWNER:

Please read this Owner’s Information Manual carefully before installing and using this appliance and keep this manual for future reference.

For your convenience, please record the model and serial numbers of your new equipment in the spaces provided. This information, along with the installation data and dealer contact information, will be helpful should your system require maintenance or service.

UNIT INFORMA TION

Model # ___________________________________

Serial # ___________________________________

INSTALLATION INFORMATION

Date Installed _____________________________

DEALERSHIP CONTACT INFORMA TION

Company Na me: _________________________________

Address:_________________________________________

________________________________________________

Phone Number:__________________________________

Technician Name:_________________________________

________________________________________________

SAFETY PRECAUTIONS

WARNING

PERSONAL INJURY, DEATH, OR PROPERTY

DAMAGE HAZARD

Failure to follow this warning could result in personal injury, death, or property damage.

Read and follow all instructions and warnings, including labels shipped with or attached to unit before operating your new air conditioner.

Any time you see this symbol in manuals, instructions and on the unit, be aware of the potential for personal injury. There are three levels of precaution:

DANGER identifies the most serious hazards which will result in severe personal injury or death.

WARNING signifies hazards that could result in personal injury or death.

CAUTION is used to identify unsafe practices which would 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.

PERSONAL INJURY, DEATH AND / OR PROPERTY

Failure to follow this warning could result in personal injury, death or property damage.

Improper installation, adjustment, alteration, service, maintenance, or use can causeexplosion, fire, electricalshock, or other conditions which may cause personal injury or property damage.

Consult a qualified installer, service agency, your distributor or branch for information or assistance. The qualifiedinstaller or service agency must use factory--authorized kits or accessories when modifying this product.

WARNING

DAMAGE HAZARD

GENERAL

The high wall fan coil unit provides quiet, maximum comfort. In addition to cooling and/or heating, the high wall fan coil unit matched with an outdoor condensing unit will filter and dehumidify the air in the room to provide maximum comfort.

IMPORTANT: The high wall fan coil unit should be installed by authorized personnel only; using approved tubing and accessories. If technical assistance, service or repair is needed, contact the installer or call 1-- 800 --428--4326.

The high wall fan coil unit can be set up and operated from the remote control (provided). If the remote is misplaced, the system

can be operated from the “Auto” setting on the unit.

Operating Modes:

The high wall fan coil unit has five operating modes.

S Fan only S Auto (heat pump models only) S Heating (heat pump models only) S Cooling S Dehumidification (DRY)

Fan Only

In Fan Only mode, the system filters and circulates room air without changing room air temperature.

Auto

In Auto mode, the system will automatically cool or heat the room according to the user--selected set point.

Heating

In Heating mode, the system heats and filters room air.

Cooling

In Cooling mode, the system cools, dries and filters room air.

Dehumidification (DRY)

In Dehumidification mode, the system dries, filters and slightly cools room air temperature. This mode does not take the place of a dehumidifier.

Remote Control

The remote control transmits commands to set up and operate the system. The control has a window display panel that shows the current system status. The control can be secured to a surface when used with the mounting bracket provided.

PART NAMES

INDOOR

UNIT

OUTDOOR

UNIT

Air inlet

Air outlet

Front panel frame

Front panel

Air filter

Horizontal air flow grille

Vertical air flow louver

Room temperature sensor

Display panel

Infrared signal receiver

Remote control

Remote control bracket

Interconnecting tubing

Control and power wiring to indoor unit

Service valves

Air outlet

A07539A

Indoor/Outdoor Unit

AUTO C OOL DRY HEAT FAN

SET TE MP.

SPEED

MODE

6 7

FAN S PEE D

AIR DIR ECTION

SWING

LED

F/C

RESET

CL OC K

TIM ER ON

TIM ER OFF

AUTO L OW MED HIGH

OFF

SLEEP

TURBO

TEMP.

CLOCK

TIMER

CANCEL

MODE BUTTON

ON / OFF BUTTON

FAN SPEED BUTTON

AIR DIRECTION BUTTON

SWING BUTTON

LED BUTTON

RESET BUTTON (Recessed)

F/C BUTTON (Recessed)

TEMP UP / TEMP DOWN BUTTONS

SLEEP BUTTON

CLOCK BUTTON

TIMER BUTTONS

CANCEL BUTTON

TURBO BUTTON

Remote Control

A08042

UNIT DISPLAY PANELS

NOTE: The display panel on the indoor unit will look like one of the following. Some of the functions will appear on the display panel, remote control or both.

On the Unit:

Infrared signal receptor

OPERATION

AUTO

ECON

TIMER

PRE-DEF

A08486

Infrared signal recepto

TIMER

OPERATION

PRE-DEF

A07544

12K

TIMER

AUTO

PRE.-DEF*

OPERATION

A08483

18K -- 24K

*PRE--DEF light will illuminate when the unit is running in FAN ONLY mode

on Cooling Only units.

Note: Cooling only units have same LED lights but without PRE--DEF print.

Remote Control Display

OPERATION:

This indicator flashes once per second after power is on and illuminates when the unit is in operation.

TIMER:

This indicator illuminates when TIMER is set ON or OFF.

PRE.--DEF indicator (heat pump units only):

Pre--Def indicator illuminates when the coil is warming up to prevent cold blow or when unit goes into defrost mode.

AUTO indicator:

When air conditioner is set to AUTO mode, the indicator illuminates.

FANONLYindicator:

When air conditioner is set to FAN ONLY mode, this indicator illuminates.

NOTE: All the pictures in this manual are for demonstration purposes only. The actual shape of your air conditioner may be slightly different, but the operation instructions are the same.

A UT O C O O L DR Y HE A T F A N

SET TEMP.

SP EE D

TRANSMISSION INDICATOR: Illuminates when remote control transmits signals to the indoor unit.

MODE DISPLAY: Indicates the current operation mode “AUTO”, “COOL”, “DRY”, “HEAT” (heat pumps only), or “FAN”.

ON/OFF INDICATOR: This symbol appears when the unit is turned on by the remote control, and disappear when the unit is turned off.

TEMPERATURE DISPLAY: Temperature setting from

AUTO LOW MED H IGH

TIM ER ON

TIM ER O FF

CL OC K

A08043

CLOCK DISPLAY: Indicates the current time (0 to 24 hours).

TIMER DISPLAY: Indicates the set times for the timer operation (0 to 24 hours).

LOCK DISPLAY: Displays when settings are locked.

FAN SPEED DISPLAY: Indicates the set fan speed. AUTO is displayed when unit is running in AUTO or DRY mode.

SLEEP DISPLAY: Indicates unit is running in SLEEP mode.

62_F(17_C) to 88_F(30_C) will be displayed. If FAN mode is selected, there will be no temperature displayed.

NOTE: Symbols shown in this manual a re for the purpose of demonstration. During actual operation, only the relevant symbols are displayed.

REMOTE CONTROL

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage. Handle the control with care and avoid getting the control wet.

IMPORTANT: The remote control can operate the unit from a distance of up to 25 ft. (7.6 m) as long as there are no obstructions.

This is one way communication only (from remote control to fan

coil).

When the timer function is used, the remote control should be kept in the vicinity of the fan coil (within 25 ft / 7.6 m)

The remote control can perform the following basic functions:

S Turn the system ON and OFF S Select operating mode S Adjust room air temperature set point and fan speed S Adjust airflow direction

Refer to the Remote Control Function section for detailed description of all the capabilities of the remote control.

Battery Installation

Two AAA 1.5 v alkaline batteries (included) are required for operation of the remote control.

To install or replace batteries:

1. Slide the back cover off the control to open the battery compartment.

2. Insert batteries. Follow the polarity markings inside the battery compartment.

3. Replace battery compartment cover.

NOTE:

1. When replacing batteries, do not use old batteries or a different type battery. This may cause the remote control to malfunction.

2. If the remote is not going to be used for several weeks, remove the batteries. Otherwise battery leakage may damage the remote control.

3. The average battery life under normal use is about 6 months.

4. Replace the batteries when there is no audible beep from the indoor unit or if the Transmission Indicator fails to light.

AUTO CO OL DRY HEAT FAN

SE T TE MP.

CLOC K

TIMER ON

TIMER OF F

SPE ED

AUTO L OW MED HIGH

MODE

TEMP.

OFF

FAN SPE ED

SLEEP

Set the

AIR DIRECTION

RE SE T

Clock

CLOCK

SWING

TIMER

CANCEL

LED

TURBO

F/C

A08032

Before you start operating the air conditioner, set the clock of the remote control as outlined below. The clock panel on the remote controller will display the time regardless of whether the air conditioner is in use or not.

Initial Setting of the

Clock:

After batteries are inserted in the remote control, the clock panel will display ”12:00” and begin to flash.

1. TEMP Button

S Press these buttons to set the time:

Y Forward B Backward

S Each time you press the button, the time moves forward

or backward by one minute depending on which button you press.

S If you push the temperature button continuously, the

time adjusts in increments of 10 minutes.

2. CLOCK Button When the right time is achieved, press the CLOCK button or release clock time stops flashing and the clock starts operating.

3. Readjusting the Clock Press the CLOCK button on the remote control for about 3 seconds, the time of the clock display will start to flash. To set the new time, follow 1 and 2 of ”Initial Setting of the Clock”.

NOTE: Note: The time of the CLOCK must be set before the AUTO--TIMER function will operate.

Clock accuracy is within 15 seconds per day.

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Static electricity or other factors (voltage fluctuations) can cause the remote control clock to reset. If your remote control is reset (the time of ”12:00” flashing), set the clock before starting the unit.

Y or the B button and wait for 3 seconds, the

CAUTION

Remote Control Operation -- Quick Start

NOTE: When transmitting a command from the remote control to

the unit, be sure to point the control toward the right side of the unit. the unit will confirm receipt of a command by sounding an audible beep.

1. Turn the unit on by pushing the ON/OFF button.

2. If there is a preference for temperature settings to be dis-

played in _F rather than _C (default), push the recessed F/C button once using a paper clip or similar object.

3. Select the desired mode by pushing the mode button.

REMOTE CONTROL FUNCTIONS

Pressing the On/Off Button

AUTO

SET TEMP.

SPEED

AUTO

C L O C K

ON/OFF INDICATOR

AUTO

COOL

DRY

HEAT

FAN

NOTE: Cool only units have no heat mode.

4. Select the temperature set point by pointing the control toward the unit and pressing the increase/decrease temperature set point buttons until the desired temperature appears on screen.

5. Select the desired fan speed by pressing the FAN SPEED button to select desired fan speed.

NOTE: If unit is operating in Dry mode, AUTO fan speed will be displayed.

6. Set the airflow direction. When the unit is turned on, the louvers default to the cooling or heating position. The user can adjust louver position by pushing the air direction button or have continuous louver movement by pushing the swing button.

Emergency Operation

If the remote control is lost, damaged, or the batteries are exhausted, the MANUAL button can be used to run the unit.

Open the front cover panel and press the MANUAL button once briefly when the system is off.

To stop emergency operation, push the MANUAL button twice or operate the remote control. If the MANUAL button is only pushed once, the system will enter TEST mode and run for 30 minutes.

A08034

When the air conditioner is not in operation, the remote control will display the last set point, mode and time.

S Press the On/Off button to start the unit.

-- The unit will start in the last operating mode and set point. The ON/OFF indicator will appear.

S Press button On/Off to stop the unit.

-- All indicator lights on the unit will go out, and the remote control will display the set point, mode and time.

NOTE: If the On/Off button is pressed too soon after a stop, the compressor will not start for 3 minutes due to the inherent protection against frequent compressor cycling. The unit will only emit an audible beep when the signals are received correctly.

Selecting an Operating Mode

Use the Operating Mode button to select one of the available modes.

OPERATING MODE

AUTO C OOL DRY HEAT FAN

AUTO

COOL

SET TEMP.

SPEED

AUTO

DRY

C L O C K

HEAT

FAN

Manual button

A07364

The set conditions of emergency operation are as follows:

S Preset set point: 76_F(24_C) S Fan speed: AUTO S Discharge air direction: Pre--set position based on operation in

“Cool”or “Heat” mode.

A08034 / A07548

Setting the Room Temperature Set Point

Pressing the increase temperature set point and decrease buttons will raise or lower the temperature.

The unit will confirm signal receipt with a beep and the value of the set temperature on the display will change accordingly.

The temperature can be set between 62_F(17_C) and 88_F (31_C).

NOTE: In Cooling mode, if the temperate selected is higher than the room temperature, the unit will not start. The same applies for the Heating mode if the selected temperature is lower than the room temperature.

Selecting the Fan Speed

AUTO

SET TEMP.

SPEED

AUTO LOW MED HIGH

C L O C K

A08036

The fan speed can be selected by pressing the FAN SPEED button. NOTE: When the unit is on, the fan will run continuously in

cooling or heating. When in heating, there might be situations where the fan will slow down or shut off to prevent cold blow.

Selecting the Horizontal Direction Louver Position

In order to optimize comfort, the horizontal louver will operate in a preset range as shown in the figure below.

COOLING

HEATING

A08044

The horizontal louvers can be adjusted using the remote control and can be set to be stationary or moving continuously.

ection

Air Dir

Press the AIR DIRECTION button repeatedly to choose one of the louver positions.

Every time the air direction button is pushed, the louver will swing by 6 degrees.

In the Cooling, Dehumidification, and Fan Only mode, the louver will swing in the cooling range. In the Heating mode, the louver will swing in the heating range.

NOTE: Always use the remote control to adjust the louver position, otherwise abnormal operation may occur. If the louver is manually adjusted out of its range, turn the unit off and then on again.

Auto Swing

To have the louver moving continuously, push the SWING button.

Push again to stop the louver.

Selecting Vertical Direction of the Louver

The vertical louvers can be adjusted manually to direct the airflow to achieve the optimal comfort in the space.

A07543

Timer Function

TIMER ON (to start the unit) and TIMER OFF (to stop the unit) can be used separately or together.

Timer ON only

AUTO

SET TEMP.

SPEED

AUTO

C L O C K

TIMER ON

A08037

This function will allow the unit to start automatically at the set time. The TIMER ON can be set while the unit is on or off.

UNIT ON

-- Press the TIMER button once. The current time flashes next to the TIMER ON display on screen. Press the temp or temp the

B button to set the desired “TIME ON”. Every time

Y or B button is pushed, the time increases or decreases

Y button

by 10 minutes.

-- When the TIMER ON is set, the TIMER light on unit illuminates. The unit will shut off and will start again at the set time.

UNIT OFF

-- Set the timer described in the UNIT ON section.

-- Theunitwillstartatthesettime.

To cancel TIMER setting, press the CANCEL button.

Timer OFF only

AUTO

SET TEMP.

SPEED

AUTO

This function will allow the unit to stop automatically at the set time. The timer can be set while the unit is on or while it is off.

UNIT ON

-- Press the TIMER button twice. The current time flashes next to the TIMER OFF display on screen. Press the temp button or temp B button to set the desired “TIME OFF”. Every time the Y or B button is pushed, the time increases or decreases by 10 minutes.

-- When the TIMER OFF is set, the timer light on the unit illuminates and the unit turns off automatically at the set time.

UNIT OFF

-- Set the TIMER off as described in the UNIT ON section.

-- The unit will turn on and will turn off at the set time.

-- If TIMER OFF is canceled (by pushing the cancel button), before the set time elapses, the unit will continue running.

C L O C K

TIMER OFF

A08040

Timer ON and Timer OFF

AUTO

SET TEMP.

SPEED

AUTO

C L O C K

TIMER ON

TIMER OFF

A08041

Use both functions to program the unit to turn on and shut off at specified times.

UNIT OFF

-- Set TIMER ON as previously described.

-- Set TIMER OFF as previously described.

-- The unit will start automatically at the set TIME ON and will turn off at the set TIME OFF.

UNIT ON

-- Set TIME OFF as previously described.

-- Set TIME ON as p reviously described.

-- The unit will turn off automatically at the set TIME OFF and will turn on at the set TIME ON.

Sleep Mode

This mode is used to conserve energy and can be used when the unit is in the COOL, HEAT or AUTO mode only.

Cool Mode

-- Push the SLEEP button. The SLEEP display will appear on the remote control.

COOL

SET TEMP.

SPEED

AUTO

-- After 1 hour the set point will be raised by 1.8_F(1_C).

-- After another hour, the set point will be raised by another

1.8_F(1_C)andthefanwillruninlowspeed.

-- The unit will shut off 7 hours after setting the SLEEP mode.

-- The SLEEP mode will be cancelled if any button on the remote control is pressed.

Heat Mode

-- Same as cooling mode but set points will be lowered by

1.8_F(1_C).

C L O C K

A08038

Turb o Mode

This function is available in COOL mode on 9k and 12k cooling only units. Use the TURBO mode to cool the room rapidly.

-- Press the TURBO button. An audible “beep” will be heard.

-- Thefanwillrunonhighspeed.

-- The TURBO mode terminates automatically after 20 minutes from pushing the Turbo mode button once. It can be terminated immediately by pushing the Turbo mode again. When the Turbo mode is terminated, the unit will go back to the original setting.

Lock

Use this function to lock the settings on the remote control and to prevent the settings being changed.

COOL

SET TEMP.

SPEED

AUTO

C L O C K

LOCK SYMBOL

A08039

To lock and unlock the remote control, press the Y and B temp buttons simultaneously for about 3 seconds.

Resetting the Remote Control

If the remote control is not functioning properly, it can be reset by pressing the reset button with a paper clip or tip of a pen. Current settings will be cancelled and the control will return to the initial settings and will be in standby mode. Push the ON/OFF button to activate it.

Time Delay

If the On/Off button is pressed too soon after a stop, the compressor will not start for 3 minutes due to the inherent protection against frequent compressor cycling. The unit will only emit an audible beep when the signals are received correctly.

Heating Features

If the unit is in the heating mode, there will be a delay when the fan starts. The fan will start only after the coil is warmed up to prevent cold blow.

Defrost Operation

In heating mode, if the outdoor coil is frosted, the indoor fan and outdoor fan will turn off while system removes the frost on the outdoor coil.

The system will automatically revert to normal operation when frost is removed from the outdoor unit.

Auto Start

If the power fails while the unit is operating, the unit stores the operating condition, and it will start operation automatically under those conditions when the power is restored.

CLEANING, MAINTENANCE AND TROUBLESHOOTING

CAUTION

ELECTRICAL SHOCK HAZARD

Failure to follow this caution may result in personal injury or death. Always turn off power to the system before performing any cleaning or maintenance to the system. Turn off the outdoor disconnect switch located near outdoor unit. Be sure to disconnect indoor unit if on a separate switch

CAUTION

EQUIPMENT DAMAGE/OPERATION HAZARD

Failure to follow this caution may result in equipment damage or improper unit operation. Operating the system with dirty air filters may damage the indoor unit and could cause reduced cooling performance, intermittent system operation, frost build --up on indoor coil or blown fuses.

Periodic Maintenance

Periodic maintenance is recommended to ensure proper operation of the unit. Recommended maintenance intervals may vary depending on the installation environment, e.g., dusty zones, etc. Refer to Table 1.

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

The coil fins are very sharp. Use caution when cleaning.

Always wear safety protection.

Cleaning the Coil

Clean the coil at the beginning of each cooling season, or when necessary. Use a vacuum cleaner or a long-- bristle brush to avoid damage to the coil fins.

Air Filters

Remove and clean the air filters once a month. NOTE: If air filters show signs of excessive wear or are torn, they

must be replaced. Contact your local dealer for replacement filters.

1. Open front panel on unit.

2. Pull filters down to remove.

3. Vacuum filters.

4. Clean with warm water.

5. Shake filter to remove excess water and dry thoroughly.

6. Replace filter by sliding into rack until filter snaps in place.

7. Close front panel on unit.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage. When cleaning the front panel, do not use water hotter than 105_F (40.56_C) and do not pour water onto the fan coil. Do not use abrasive or petroleum based cleaners as they may damage the front panel.

Indoor Unit Front Panel

To clean the front panel on the indoor unit, wipe the outside with a soft, dry cloth. If necessary, a mild liquid detergent can be applied and wiped off with a dry cloth.

Preparing for Extended Shutdown Period

Clean the filters and reposition them in the unit. Operate the unit in Fan only mode for 12 hours to dry all internal parts.

Turn main power supply off and remove batteries from the remote control.

System Operation Recommendations

The items outlined in the following list will help to assure proper system operation:

S Replace both remote control batteries at the same time. S Point the remote control toward the unit display panel when

transmitting a command.

S Keep doors and windows closed while unit is operating. S Contact an authorized service representative if a problem arises

that cannot be easily resolved.

S Do not perform cleaning or maintenance activities while unit

is on.

S Keep display panel on unit away from direct sunlight and heat

as this may interfere with remote control transmissions.

S Do not block air intakes and outlets on the indoor or outdoor

units.

Energy Saving Recommendations

The following recommendations will add greater efficiency to the ductfree system:

S Select a comfortable thermostat setting and leave it at chosen

setting. Avoid continually raising and lowering the setting.

S Keep unit filter clean. Frequent cleaning may be necessary de-

pending on indoor air quality.

S Use drapes, curtains or shades to keep direct sunlight from

heating room on very hot days.

S Do not obstruct air intake on front panel. S Turn on air conditioning before indoor air becomes too un-

comfortable.

Troubleshooting

Refer to Table 2 before contacting your local dealer.

Table 1—Periodic Maintenance

INDOOR UNIT EVERY MONTH EVERY 6 MONTHS EVERY YEAR

Clean Air Filter* Change Remote Control Batteries

OUTDOOR UNIT EVERY MONTH EVERY 6 MONTHS EVERY YEAR

Clean Outdoor Coil from Outside Clean Outdoor Coil from Inside† BlowAirOverElectricParts† Check Electric Connection Tightening† Clean Fan W heel† Check Fan Tightening† Clean Drain Pans†

* Increase frequency in dusty zones.

{ Maintenance to be carried out by qualified service personnel. Refer to the Installation Manual

S S S S S S

Table 2—Troubleshooting

PROBLEM POSSIBLE CAUSE SOLUTION

Unit/System Does Not Work • The circuit breaker has tripped or a fuse

has blown.

• Power failure.

• Diagnostic lights illuminate.*

• Voltage is too low.

Cooling is Not Working Properly

• The filter is blocked with dust.

• Temperature is not set properly.

• A window or door is open.

• The outdoor unit is obstructed.

• The fan speed is too low.

• The operation mode is in Fan instead of

Cool.

Heating is Not Working Properly

• The filter is blocked with dust.

• Temperature is set too low.

• A window or door is open.

• The outdoor unit is obstructed.

Unit Stops During Operation • The Off timer is not operating correctly.

• Diagnostic lights illuminate.*

* Diagnostic lights are a combination of lights that will illuminate in the display area on the unit. They are a combination of the lights you see during normal

operation.

• Reset the circuit breaker or replace the fuse with the specified replacement fuse.

• Restart operation when the power is restored.

• Call your service representative.

• Clean the air filter.

• Check the temperature and reset if necessary.

• Close the window or door.

• Remove the obstruction.

• Change the fan speed selection.

• Change the operating mode to Cool or reset the

unit.

• Clean the air filter.

• Check the temperature and reset if necessary.

• Close the window or door.

• Remove the obstruction.

• Restart the operating mode.

• Call your service representative.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Printed in U.S.A. Edition Da te: 11/0 8

Catalog No: OM538 --- 619M ---01

Replaces: New

Bryant 538MNQ, 538MAC, 538MAQ, 538MNC, 619MNQ User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual