Mitsubishi AT-50A User Manual

Air-conditioner Control System ADVANCED TOUCH CONTROLLER

MODEL

AT-50A

INSTRUCTION BOOK

Safety Precautions ..............................................................2

Function List ........................................................................ 4

Names and Functions of Controller Components................ 6

Screen Conguration [HOME screen] ................................. 8

Buttons [HOME screen] ..................................................... 10

Icon Displays [HOME screen]............................................ 12

Basic Operations ............................................................... 16

Screen selection .........................................................................16

Group selection ..........................................................................17

Operating the Air conditioning unit group ...................................18

ON/OFF operation ........................................................................ 18

Mode ............................................................................................. 18

Temperature setting ...................................................................... 20

Interlocked ventilation units(LOSSNAY)/Fan speed/Air direction/Louver settings

"Disable scheduled operation" button ........................................... 22

Operating the LOSSNAY group ..................................................22

Mode ............................................................................................. 22

Fan speed setting ......................................................................... 22

Operating the General equipment group ....................................22

Before using the controller, read this Instruction Book carefully to ensure proper operation. Retain this Instruction Book for future reference. Make sure that this manual as well as the Installation Manual are passed on to any future air condition system users. To ensure safety and proper operation of the unit, the unit should only be installed by qualified personnel.

ON/OFF operation ........................................................................ 22

Multiple group selection screen ..................................................23

Disabling functions .....................................................................23

Menu Screen ..................................................................... 24

Usage - Main Menu Settings ............................................. 26

Operation Setting .......................................................................26

Restriction Settings ....................................................................42

Control Panel ..............................................................................50

System Management .................................................................57

Maintenance ...................................................................... 61

Touch Panel Cleaning screen .....................................................61

Troubleshooting ................................................................. 62

....... 21

Safety Precautions

Thoroughly read the following safety precautions prior to installation.

●

Observe the following precautions to ensure safety.

●

WARNING CAUTION

Nomenclature

●

(Prohibited actions)

After reading this manual, pass it on to the end user to retain for future reference.

●

Keep this manual for future reference and refer to it as necessary. This manual should be made available to those who repair or relocate

●

the controller. Make sure that the manual is passed on to any future AT-50A users.

Indicates a risk of death or serious injury. Indicates a risk of serious injury or structural damage.

(Do not touch) (No water)

All electric work must be performed by qualied personnel.

(No wet hands) (Electric shock hazards)

(Injury hazards) (Important actions)

General precautions

WARNING

Do not install the unit in a place where large amounts of oil, steam, organic solvents, or corrosive gases, such as sulfuric gas, are present or where acidic/ alkaline solutions or sprays are used frequently. These substances can compromise the performance of the unit or cause certain components of the unit to corrode, which can result in electric shock,

malfunctions, smoke, or re.

To reduce the risk of shorting, current leakage,

electric shock, malfunctions, smoke, or re, do not

wash the controller with water or any other liquid. To reduce the risk of electric shock, malfunctions,

smoke or re, do not operate the switches/buttons or

touch other electrical parts with wet hands.

CAUTION

To reduce the risk of re or explosion, do not place ammable materials or use ammable sprays around

the controller.

To reduce the risk of damage to the controller, do not

directly spray insecticide or other ammable sprays

on the controller. To reduce the risk of electric shock or malfunctions,

do not touch the touch panel, switches, or buttons with a pointy or sharp object.

To reduce the risk of injury or electric shock, before spraying a chemical around the controller, stop the operation and cover the controller.

To reduce the risk of injury or electric shock, stop the operation and switch off the power supply before cleaning, maintaining, or inspecting the controller.

Properly install all required covers to keep moisture and dust out of the controller. Dust accumulation and

water can cause electric shock, smoke, or re.

To reduce the risk of injury and electric shock, avoid contact with sharp edges of certain parts.

To avoid injury from broken glass, do not apply

excessive force on the glass parts.

To reduce the risk of injury, wear protective gear when working on the controller.

Precautions for moving or repairing the controller

WARNING

The controller should be repaired or moved only by

qualied personnel. Do not disassemble or modify the

controller. Improper installation or repair may cause injury,

electric shock, or re.

Additional precautions

To avoid damage to the controller, use appropriate tools to install, inspect, or repair the controller.

AT-50A is designed for exclusive use with the Building

Management System by Mitsubishi Electric. The use of this controller for with other systems or for other purposes may cause malfunctions.

CAUTION

To reduce the risk of shorting, electric shock, re,

or malfunction, do not touch the circuit board with tools or with your hands, and do not allow dust to accumulate on the circuit board.

To avoid damage to the controller, do not overtighten the screws.

To avoid discoloration, do not use benzene, thinner, or chemical rag to clean the controller. To clean the controller, wipe with a soft cloth soaked in water with mild detergent, wipe off the detergent with a wet cloth, and wipe off water with a dry cloth.

To avoid damage to the controller, provide protection against static electricity.

Precautions during installation

WARNING

Do not install the controller where there is a risk of

leaking ammable gas. If ammable gas accumulates around the controller, it may ignite and cause a re or explosion.

Properly dispose of the packing materials. Plastic bags pose suffocation hazard to children.

Function List

The table below summarizes the functions that are available on the AT-50A. Refer to the pages listed for details.

Function Description Page

Switches the ON/OFF operation of the units such as air conditioning

ON/OFF Operation

Mode

Set Temperature Fan Speed Air Direction

Unit Operation

Time and Schedule

System Management

*1: Available functions vary depending on the unit type. Only the functions that are supported by the connected units can

be controlled from the AT-50A.

Louver

ON/OFF Operation for Interlocked Ventilation

Collective Operation

Date and Time

Weekly/1-day schedule

Setback Control

Disabling scheduled operation

System-Changeover

units. The LED on the Collective ON/OFF button will light up when one or more units are in operation and off when all units are stopped. Switches the mode “Cooling/Dry/Fan/Auto/Heating” for each group or all groups. (Switches the mode “Bypass/Heat recovery/ Auto” for LOSSNAY

groups.) Sets the set temperature for each group or all groups.

Adjusts the fan speed for each group or all groups.

Adjusts the air direction for each group or all groups.

*1 *1

Enables/disables the louver for each group or all groups. The ON/OFF operation of the interlocked ventilation unit is interlocked

with the ON/OFF operation of the air conditioning unit. The interlocked ventilation units can be independently operated for ON (High/Low)/ OFF for each group or all groups. (When the ventilation unit is interlocked

with the air conditioning unit, the ventilation mode cannot be used.)

The following functions can be collectively executed on multiple groups:

Setback, Schedule, Mode, Temperature Correction, RC Prohibition. Sets the date, time, and display formats. The current time will appear at

the top right corner of the HOME screen.

• Allows the user to set the Weekly schedule for each group.

• Maximum of 16 events can be scheduled for each day.

• The types of actions that can be scheduled are as follows: ON/OFF,

Mode, Set Temperature, Fan Speed, Air Direction, and Remote Controller Operation Prohibition.

• Maximum of 12 patterns can be congured for the Weekly schedule,

and 5 for 1-day schedule.

• Two types of weekly schedule (Summer/Winter) can be set.

• 1-day schedule overrides the Weekly schedule. This function helps keep the indoor temperature in the temperature range while the units are stopped and during the time this function is effective.

Scheduled operation can be temporarily disabled. This setting must be set to OFF to run scheduled operation.

Automatically switches the entire system (all indoor units that are connected to the same outdoor units) to Cooling or Heating by periodically monitoring the room temperature and the preset temperature of each group and determining the best operation mode.

• The System-Changeover function is not available for the following

types of products: Simultaneous Cooling/Heating units (with automatic

mode change function), Mr. SLIM®, LOSSNAY, and DIDO controller.

20 21 21 21

19 38

Restriction Settings

Basic Settings

Maintenance

Miscellaneous

Function Description Page

Lock Buttons

Set Temperature Range Limit

Prohibit Remote Controller

Operation Mode Selection Limit

Display Format

Function Key Setting

HOME screen Operation Mode Setting

Volume Control

Error

Filter sign Touch Panel

Cleaning Mode Touch Panel

Calibration Mode

External input

External output

Locks the following buttons: Collective ON/OFF, F1, F2, and Main

Menu.

Locks the following functions: ON/OFF, Mode, Set Temp, Fan

Speed, and Schedule ON/OFF. Limits the available temperature range for the local remote

controllers (each group or all groups).

Locks the following buttons on the local remote controllers: ON/

OFF, Mode, Set Temperature, and Filter Reset buttons (collectively or by group)

When set as the main controller, operation of the following modes with the local remote controllers can be prohibited.

When cooling is prohibited: Cooling, dry, automatic cannot be

chosen.

When heating is prohibited: Heating, automatic cannot be chosen. When cooling/heating is prohibited: Cooling, dry, heating, automatic

cannot be chosen.

Selects the display formats for the following items: Display

language, temperature unit, room temperature, display or nondisplay of Cooling/Heating mode icons (during Auto mode), backlight timer, and group names.

The F1 button and the F2 button can be set as a run button of the

following collective operation: Setback, Schedule, Operation Mode,

Temperature Correction, Remote Controller Prohibition. When the Group icon is touched, the action differs depending on

the operation mode. Default is set to the operation mode 2.

Operation mode 1:

Operation mode 2:

Operation mode 3: Directly moves to the Group screen of the

Sets the sound volume and screen brightness. If an error occurs on the AT-50A controller or the units and

controllers it controls, the LED on the Collective ON/OFF button will blink. If an error occurs on the indoor or LOSSNAY units, appear on the corresponding group icon on the HOME screen. The

error code can be veried and reset on the Status List screen.

Filter Icon will appear on the HOME screen when the lter is due

for cleaning. The icon can be removed from the Status List screen. Disables the touch panel to allow the user to clean the panel. Calibrates the touch panel if the touch panel does not respond

correctly when touched.

Receives input signals from external devices and start/stop all

groups of units or permit/prohibit operations from the local remote controllers. Requires cable connections.

Outputs the operation status of the units (ON/OFF) or error signals

to external devices collectively, using contact signals. Requires

cable connections.

Turns ON/OFF the units in the group whose Group icon is touched.

Displays the check mark when Group icon is touched. Touch the Group icons of the groups

to be operated, and then touch the “OPERATE” button to move to the Group screen. Multiple groups can be selected. Use this mode when operating the multiple groups collectively.

group whose Group icon is touched.

will

11 23 42

Names and Functions of Controller Components

Product features

The AT-50A described in this manual is a centralized controller with color LCD touch panel for air conditioning units, LOSSNAY, and General equipment using the Mitsubishi Electric DIDO controller (PACYG66DCA). AT-50A can control up to 50 units/50 groups. (*1) AT-50A controls and monitors the air conditioning units of each group. AT-50A also can control detailed scheduling and prohibits the local remote controller operation in each room (group), which may lead to energy savings. Basic operations are accessed through the AT-50A touch panel. ON/OFF, F1, and F2 operations that

control air conditioning units collectively are accessed by using buttons next to the touch panel.

AT-50A display screen consists of three types, corresponding to the usage.

HOME screen : Monitoring screen to monitor the operation status of the units

(described in this Instruction Book)

Main Menu screen : Setting screen to set the functions such as schedule settings

Maintenance screen : Initial setting screen to set the basic systems such as group settings

* 1 Group: minimum unit to be controlled by AT-50A

A group consists of units (16 units maximum).

(described in this Instruction Book)

(described in the Installation Manual)

Touch panel / Buttons

1 Display/Touch panel

AT-50A features a 5" color LCD touch panel. Touch panel displays the operation status of the units. Function settings such as week schedule settings are accessed through the touch panel. The backlight lights up when the panel is touched, and lights off after certain period of time. The

backlight will remain lit as long as an error exists.

2 Collective ON/OFF Button *1

The Collective ON/OFF button enables the collective ON/OFF function that allows the user to turn on/off the air conditioning units, LOSSNAY, and DIDO controllers in all groups collectively. The indicator corresponds to the operation status of controlled units.

Unlit : Indicates that all units are stopped.

Lit : Indicates that one or more units are in operation.

Blink : Indicates that an error is occurring.

3 Function 1 Button (F1), 4 Function 2 Button (F2) *1 *2

Desired functions from the following list can be assigned to the F1 and F2 buttons. (Setback/Schedule/Operation Mode/Temperture Correction/Remote Controller Prohibition) The functions to assign to these buttons can be selected from the Function Key Setting on the Control Panel. The indicator on the buttons indicates the enabled/disabled status of the function.

Unlit : The assigned function is disabled. Lit : The assigned function is enabled.

The indicators on the F1 and F2 buttons will be lit or unlit when the functions that are assigned to the F1 and F2 buttons are enabled or disabled from the Collective Operation panel.

5 Power indicator

The power indicator lights up when the power to AT-50A is turned on.

Unlit : Power OFF

Lit : Power ON

*1 When the button is pressed while the operation is prohibited, the LED will blink twice. *2 Buttons 2, 3, and 4 are available only on the HOME screen.

Buttons 2, 3, and 4 have indicators on the top.

Screen Configuration [HOME screen]

HOME screen

1. How to switch the HOME screen

Touch tubs to change the display format.

: Displays the GRID screen.

: Displays the GRID (zoom-out) screen.

: Displays the GRID (zoom-in) screen.

: Displays the LIST screen.

: Displays the GROUP screen.

2. How to move to the Main Menu screen

: Displays the Main Menu screen.

3. How to move to the Maintenance screen

Refer to the Installation Manual.

GRID screen

Zoom-out screen

To the GRID (zoom-in) screen

Zoom-in screen

To the GRID (zoom-out) screen

To the GROUP screen

To the GRID screen

To the LIST screen

To the GRID screen

GROUP screen

To the LIST screen

LIST screen

To the GROUP screen

[Main Menu screen]

To the Main Menu screen

To the HOME screen

Buttons [HOME screen]

① ② ③ 󱦯④ ⑤

⑨ ⑩⑦⑧

⑧ ⑪

⑯ ⑰ ⑱

⑮

󱦱

⑥

󱦱

⑪

⑫

⑥

⑭

⑬

⑲

HOME screen

GRID (zoom-out) screen GRID (zoom-in) screen

Displays the operation status of all groups. The button layout 6 varies with the number of the registered groups.

LIST screen

Displays the detailed operation status of each group with group name. (5 groups on 10 pages

maximum)

Note: Display

⑨

mode. Refer to P17 "Operation mode" for details.

Sample displays above are for default setting: Operation

mode 2.

Operation mode 1

Operation mode 2

and ⑩ vary depending on the operation

Displays the detailed operation status of each

group. (10 groups on 5 pages maximum)

GROUP screen

Displays the detailed operation status of each group. Sets group operations. (When the air conditioning units are controlled)

LOSSNAY

1GRID screen button

Displays the GRID screen.

2LIST screen button

Displays the LIST screen.

3GROUP screen button

Displays the GROUP screen.

4MAIN MENU screen button

Displays the MAIN MENU screen.

5Operation lock button

Locks or unlocks the buttons on the AT-50A. Press and hold the button for two seconds to lock or unlock the buttons. The locked/unlocked status icon will appear on the buttons.

A password may be required to unlock certain buttons. Select the buttons to be locked from the Lock Buttons (Refer to P42.) on the Main menu. If no items have been selected, the operation lock button will not appear on the screen.

Group icon (operation status display) button

Operation differs depending on the operation mode. Operation mode 1

Turns ON/OFF the units in the group whose Group icon is touched.

Operation mode 2

Switches the Group icon between Selected (checked) and Deselected (unchecked). (Default) Displays the check mark when Group icon is touched.

Operation mode 3

Directly moves to the Group screen of the group whose Group icon is touched.

Locked

Unlocked

7 “Access the Collective Operation

panel” button

Press this button to bring up the collective operation panel. (Refer to P19 for information about the collective operation panel.)

GRID (zoom-out/zoom-in) screen button

: Displays the zoom-out screen. : Displays the zoom-in screen.

9Select All button

Selects/Deselects groups collectively. Adds check marks to all selected icons.

0Move-to-the-selected-group button

Moves to the GROUP screen of the selected group. Moves to the Multiple group selection screen when multiple groups are selected. Refer to P23 "Multiple group selection screen" for details.

aPage button

Flips through pages.

bDisplay selection button

Shows/Hides the display for the information below.

• Set temperature

• Scheduled operation is enabled.

cGroup button

Switches the group to be displayed.

dMode button

Switches the operation mode of the air conditioning units and LOSSNAY.

eSet temperature button

Adjusts the set temperature by using the + and – buttons. Set temperature appears above the button.

“Disable scheduled operation” button

Use this button to temporarily disable the scheduled operation on the display. The indicator on the button will remain lit when the function is enabled. The scheduled operation will not be run when the icon

is displayed.

Interlocked ventilation (LOSSNAY)/ Air direction/Fan speed/Louver setting button

Displays the popup window of Interlocked ventilation (LOSSNAY)/Air direction/Fan speed/ Louver setting screen.

* Refer to P21 "Interlocked ventilation units

(LOSSNAY)/Fan speed/Air direction/Louver settings" for the popup window.

⑱ON/OFF button

Changes the operation to ON/OFF.

⑲Fan speed selection button

Switches LOSSNAY fan speed between Lo and High.

1Current time

Displays the current time.

2Current page/Total pages

Displays the Current page/Total page number.

Operation mode 3

Note: Depending on the units to be controlled and AT-50A settings, available button operations and displays vary. : While the icon is displayed on the button, the operation is locked.

10 11

Icon Displays [HOME screen]

(1) GRID (zoom-out) screen

(2) GRID (zoom-in) screen

[ON (BG Color: blue)]

Group No.

•Filter sign

•Check mark

[OFF (BG Color: black)]

[Error (BG Color: yellow)]

Error display Communication error

at startup

[Air conditioning ]

[ON (BG Color: blue)]

•Check mark

•ON/OFF operation prohibition

Group No.

•Mode

•Filter sign:

Schedule (enable/disable)

Room temperature Interlocked ventilation

(LOSSNAY) operation

[OFF (BG Color: black)]

[LOSSNAY group]

[ON (BG Color: blue)] [OFF (BG Color: black)]

Filter sign:

LOSSNAY icon

Schedule (enable/disable)

[General equipment group]

[ON (BG Color: blue)]

Schedule (enable/disable)

General equipment icon

[Error (BG Color: yellow)] [Air conditioning unit/LOSSNAY/General equipment group]

Error display

[OFF (BG Color: black)]

(3) LIST screen

Display selection button

Set temperature*

[OFF (BG Color: black)]

Schedule (enable/disable)

Room temperature

** Interlocked LOSSNAY does not appear during operation.

[OFF (BG Color: black)]

•LOSSNAY icon

•General equipment icon

Group No. Room (Group) name

•Check mark

[LOSSNAY group]

Group No. Room (Group) name

•Check mark

[ON (BG Color: blue)]

Schedule (enable/disable)

Room

•Mode

•Filter sign:

* When the temperature offset function is

enabled, the temperature will appear in the green outline font.

[ON (BG Color: blue)]

•LOSSNAY icon

•Filter sign:

temperature

Schedule (enable/disable) Schedule (enable/disable)

[General equipment group]

Group No. Room (Group) name Schedule (enable/disable) Schedule (enable/disable)

•Check mark

[ON (BG Color: blue)] [OFF (BG Color: black)]

•General equipment icon •General equipment icon

Interlocked ventilation**

ON: blue

OFF: black

Display selection button

[ON (BG Color: blue)] [OFF (BG Color: black)]

Interlocked ventilation (LOSSNAY) operation**

•Mode

•Filter sign:

[ON (BG Color: blue)] [OFF (BG Color: black)]

•LOSSNAY icon

•Filter sign:

[ON (BG Color: blue)] [OFF (BG Color: black)]

Room temperature

Error:

Displays

when an error occurs.

Startup (communication) error:

Displays

as well as the error display when a

startup (communication) error occurs.

Filter sign:

Displays

when lter needs maintenance.

During scheduled operation:

Displays

during scheduled operation.

When the "Disable scheduled operation" button is enabled:

Displays

when the "Disable scheduled

operation" button is enabled.

Room temperature:

Display ranges 8-39ºC (46-102ºF). When the temperature is beyond the range, 8ºC (46ºF) or 39ºC (102ºF) will blink on the display. When multiple air conditioning units (indoor units) are registered to a group, current indoor temperature on the main indoor unit is displayed.

Interlocked ventilation (LOSSNAY):

Displays when there are ventilation units interlocked with the air conditioning (indoor) units in the group.

Icon color indicates the operation status (Blue: ON, Black: OFF).

General equipment icon:

Displays the General equipment type.

Error (BG Color: yellow)

【

Air conditioning

【

unit/LOSSNAY/General equipment group

】

Error display

】

Icon Displays [HOME screen]

GROUP screen

[Air conditioning unit group]

During operation

Group No.

Mode

Error

Startup (communication)

error

Filter sign

Scheduled operation

/Disabled

Disable scheduled

operation function: ON

Disable scheduled

operation function: OFF

Temperature Correction

While the unit is stopped

Group name

Fan speed Louver

Air direction

Interlocked ventilation (LOSSNAY)

Room temperature Set temperature

When the Temperature Correction function is enabled

[LOSSNAY group]

During operation

While the unit is stopped

Fan speed display

[General equipment group]

During operation

While the unit is stopped

General equipment icon

Interlocked ventilation

(LOSSNAY)

Error:

Displays

Startup (communication) error:

Displays startup (communication) error occurs.

Filter sign:

Displays

During scheduled operation:

Displays

Note : While the icon is displayed on the button, the operation is locked.

when an error occurs.

as well as the error display when a

when lter needs maintenance.

during scheduled operation.

When the "Disable scheduled operation" button is enabled:

Displays operation" button is enabled.

Room temperature:

Display ranges 8-39ºC (46-102ºF). When the room temperature is beyond the range, 8ºC (46ºF) or 39ºC (102ºF) will blink on the display. When multiple air conditioning units (indoor units) are registered to a group, current indoor temperature on the main indoor unit is displayed.

when the "Disable scheduled

When the Temperature Correction function is enabled:

When the Temperature Correction function is enabled, the corrected temperature will appear in the green outline font.

Interlocked ventilation (LOSSNAY):

Displays the operation status of the ventilation that is interlocked with the air conditioning (indoor) units.

General equipment icon:

Displays the General equipment type.

Basic Operations

Screen selection

GRID (zoom-out) screen appears at the initial startup. Select the desired screen.

GRID (zoom-out) screen

GRID (zoom-in) screen

LIST screen

Group selection

• Operation mode 1, 2, 3

When the Group icon 1 is touched, the action differs depending on the operation mode. Operation mode consists of three modes (shown below), and default is set to the operation mode 2. Refer to P41 for changing the mode.

• Operation mode 2: appears in the area marked 2.

Allows the user to select groups to be operated. Moves to the Group screen.

Touch the Group icon 1 to select the group to be operated. Groups can be selected on the GRID or the LIST screens. Touch the Group icon 1 to switch between displaying check marks (selected) and hiding check marks (deselected). Touch 3 to select all groups. Touch the Group icons of the groups to be operated, and then touch the Group screen.

The number of selected groups = 1 : The selected group appears on the Group screen.

Refer to P18 "Group screen" for details.

The number of selected groups > 1 : The Multiple group selection screen appears.

(The selected groups can be operated collectively.) Refer to P23 "Multiple group selection screen" for details.

• Operation mode 1: appears in the area marked 2. Stops or starts the operation of the air conditioning units through Group icon 1.

2 to move to

* ON/OFF operation lock

When AT-50A restricts its own ON/OFF operation, the icon above will appear. The ON/OFF operation will be disabled.

* During receiving the external input signal

The ON/OFF function cannot operate when the following displays appear.

■Displays the emergency stop level-signal input* ■Displays ON/OFF level-signal input

When the group icon button is set to the operation mode 1

• Operation mode 3: Nothing appears in the area marked 2. Moves to the Group screen by touching the Group icon 1.

The button cannot be operated.

Basic Operations

Operation Screen (Group screen)

Operating the Air conditioning unit group

Basic operations (GROUP screen)

5 3

ON/OFF operation

Touching 3 allows the indoor units in the displayed group to start/stop. When interlocked ventilation units (LOSSNAY) are connected, the ventilation units work in conjunction with indoor units.

ON:

OFF:

[Green] [Black]

Collective Operation Panel

This panel has the functions that can be

executed collectively. (Setback, Schedule, Mode,

Temperature Correction, RC Prohibition) Touching the

icon on the GRID or the LIST screen will bring up the Collective Operation panel. Each button has an indicator and the function name.

The indicators on the buttons show which functions are assigned to which buttons.

▪ Before using the Collective Operation buttons, the groups to execute collective settings on must be selected,

and the parameters must be set from Main Menu>Operation Setting>Collective Operation Setting.

appears on an icon of a given function, the function is not available.

▪ If

icon at the left bottom of the

Indicator Function

Collective Operation button

Performing Collective Operation

On the GRID or the LIST screen, touch the button that brings up the Collective Operation Panel.

Select the Collective Operation button on the Collective Operation panel.

Press OK on the Collective Operation panel.

(Go to 4 if Setback or Mode was selected. Otherwise, the setting is complete.)

If Setback or Mode was selected, take the following steps.

When Setback is selected When Mode is selected

Mode (useable only while the unit is in operation)

Touch 2 to access the modes in order of "Cooling, Dry, Fan, Auto, and Heating." The selected mode will appear in the area labeled 1.

*Refer to P51 for Auto mode cooling/heating settings. *To operate an indoor unit in the heating (cooling) mode

while the indoor unit is already operating in the opposite mode, the operation mode cannot be changed until all of the indoor units operate in the same mode or stop. In this case, the mode 1 will blink.

*Available mode varies depending on the model.

Modes that are unavailable do not appear.

*The operation mode which is restricted by this controller or

other controllers cannot be selected.

Auto heating display

Auto cooling display

ouch OK on the popup window.

Select the desired item, and touch OK.

▪ Scheduled: Scheduled operation is enabled. The units will

▪

Unscheduled

▪ OFF

* Regardless of how the above settings are made, the Setback

function will not be executed if the operation switch is on.

* A blinking indicator on a button indicates that the function that corresponds to the button cannot be

operate according to the Setback Control settings. (P35)

: Scheduled operation is disabled. The units will

operate according to the Collective Operation settings (Setback). (P39)

: The Setback function will not be executed.

collectively executed. Check the settings for the “Collective Operation Setting.”

▪ T

▪ Select a mode on the window that will appear

▪ Press OK.

+ 23 hidden pages

Mitsubishi AT-50A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual