Mitsubishi Electric PAC-YT53CRAU Installation Manual

– 1 –

This installation manual describes how to install the Simple MA Remote Controller for use with Mitsubishi Building Air Conditioning System, direct expansion type CITY MULTI air conditioner indoor units (“-A” type and later), and Mitsubishi M-Series and P-Series packaged air conditioners. Please be sure to read this installation manual and Instruction Book that are supplied with the Remote Controller before proceeding with the installation. Failure to follow the instructions may result in equipment damage. For information on how to wire and install the air conditioning units, refer to the installation manual. After the installation, hand over this manual to users.

• Read the following safety precautions prior to installation.

• Observe these precautions carefully to ensure safety.

• After reading this manual, provide this manual to end user 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 forwarded to future end users.

WARNING

1 Safety Precautions

WARNING

Indicates a risk of death or serious injury if you misuse the PAC-YT53CRAU.

CAUTION

Indicates a risk of serious injury or structural damage if you misuse the PAC-YT53CRAU.

General precautions

All electric work must be performed by qualified personnel.

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 fire.

To reduce the risk of shorting, current leakage, electric shock, malfunctions, smoke, or fire, do not wash the controller with water or any other liquid.

To reduce the risk of electric shock, malfunctions, smoke or fire, do not operate the switches/buttons or touch other electrical parts with wet hands.

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.

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, keep children away while installing, inspecting, or repairing the unit.

Properly install all required covers to keep moisture and dust out of the controller. Dust accumulation and water can cause electric shock, smoke, or fire.

CITY MULTI Control System and Mitsubishi M-Series and P-Series Air Conditioners

Simple MA Remote Controller PAC-YT53CRAU

Installation Manual

WT06429X01

For distribution to dealers and contractors

– 2 –

CAUTION

WARNING

CAUTION

WARNING

CAUTION

Precautions during installation

Precautions during wiring

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 damage to the controller, do not directly spray insecticide or other flammable sprays on the controller.

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

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

Consult your dealer for the proper disposal of the controller.

Do not install the unit where there is a risk of leaking flammable gas. If flammable gas accumulates around the unit, it may ignite and cause a fire or explosion.

To reduce the risk of shorting, current leakage, electric shock, malfunctions, smoke, or fire, do not install the controller in a place exposed to water or in a condensing environment.

Controller must be installed by qualified personnel according to the instructions detailed in the Installation Manual. Improper installation may result in electric shock or fire.

Install the top case into the bottom case until it clicks.

To reduce the risk of damage to the controller, malfunctions, smoke, or fire, do not connect the power cable to the signal terminal block.

Properly secure the cables in place and provide adequate slack in the cables so as not to stress the terminals. Improperly connected cables may break, overheat, and cause smoke or fire.

To reduce the risk of injury or electric shock, switch off the main power before performing electrical work.

All electric work must be performed by a qualified electrician according to the local regulations, standards, and the instructions detailed in the Installation Manual.

To reduce the risk of electric shock, install a breaker and a residual current circuit breaker on the power supply. To reduce the risk of electric shock, smoke, or fire, install a breaker for each controller.

Use properly rated breakers and fuses (breaker, local switch <switch + fuse>, no-fuse breaker). Breaker with a breaking capacity greater than the specified capacity may cause electric shock, malfunctions, smoke, or fire.

To reduce the risk of current leakage, overheating, smoke, or fire, use properly rated cables with adequate current carrying capacity.

Proper grounding must be provided by a licensed electrician. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod, or telephone wire. Improper grounding may result in electric shock, smoke, fire, or malfunction due to electrical noise interference.

To reduce the risk of electric shock, shorting, or malfunctions, keep wire pieces and sheath shavings out of the terminal block.

To reduce the risk of shorting, current leakage, electric shock, or malfunctions, keep the cables out of contact with controller edges.

To reduce the risk of electric shock, malfunctions, or fire, seal the gap between the cables and cable access holes with putty.

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WARNING

CAUTION

Precautions for moving or repairing the controller

Additional precautions

The controller should be repaired or moved only by qualified personnel. Do not disassemble or modify the controller. Improper installation or repair may cause injury, electric shock, or fire.

To reduce the risk of electric shock, shorting, or malfunctions, keep wire pieces and sheath shavings out of the terminal block.

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

This controller 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.

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.

Take appropriate measures against electrical noise interference when installing the air conditioners in hospitals or facilities with radio communication capabilities. Inverter, high-frequency medical, or wireless communication equipment as well as power generators may cause the air conditioning system to malfunction. Air conditioning system may also adversely affect the operation of these types of equipment by creating electrical noise.

To avoid malfunctions, do not bundle power cables and signal cables together, or place them in the same metallic conduit.

Leave the circuit board and its protective film on the case.

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

Use a flat-head screwdriver with a blade width of 5 mm (7/32 inch).

Do not turn the flat-head screwdriver with fitting it in the latch strongly.

To avoid deformation and malfunction, do not install the remote controller in direct sunlight or where the ambient temperature may exceed 40ºC (104ºF) or drop below 0ºC (32ºF).

Do not install the controller on the control panel door. Vibrations or shocks to the controller may damage the controller or cause the controller to fall.

Secure the cable with a clamp.

Do not use solderless terminals to connect cables to the terminal block. Solderless terminals may come in contact with the circuit board and cause malfunctions or damage the controller cover.

After connecting the connector, install the top case properly.

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The following parts are included in the box.

(1) Field-supplied parts

The following parts are field-supplied parts.

(2) Field-supplied tools

• Flat-tip screwdriver (Width: 3 - 5 mm (1/8 - 7/32 inch))

• Knife or Nipper

• Miscellaneous tools

2 Component names and supplied parts

*3 ISO metric screw thread *4 Remote controller cable is not included.

3 Field-supplied parts/Required tools

Parts name Qty. Notes Single switch box 1 Not required for direct wall installation Thin metal conduit Necessary Lock nut and bushing Necessary Cable cover Necessary Required for routing remote controller cable along a wall Putty Reasonable Molly anchor Necessary Remote controller cable

(Use a 0.3 mm² (AWG22) 2-core sheathed cable.)

Necessary If you need to use a cable extension longer than 10 m (32 ft),

select an electric wire that meets the following specifications: Wire specification VCTF or CVV (2-core):

1.25 mm² (stranded 16 AWG) or equivalent

Parts name Qty. Appearance

Remote controller (top case) 1 Right figure *1

Remote controller (bottom case) 1 Right figure *2

Roundhead cross slot screws M4×30 2 *3

Wood screw 4.1×16 (for direct wall installation)

2*3

Installation Manual (this manual) 1

Instruction Book 1

Bottom case *2

Top case *1

16 (5/8) 16 (5/8)

25 (1)

102 (4)

54 (2-1/8)

(13/16)

(3/8)

44 (1-3/4)

1.5 (1/16) or less

83.5±0.4 (3-3/8±1/32)

ø6 (1/4OD)

20 (13/16)

(1/4)

ø6 (1/4OD)

20 (13/16)

Switch box

unit: mm (in)

– 5 –

The wiring is different when the remote controller is connected to a CITY MULTI control system (“-A” type and later) and when it is connected to a M-Series and P-Series air conditioner (A control type). The wiring also differs with the system configuration. Check the system used.

1. Connecting to CITY MULTI control system

The numbers (1) to (4) in the figure correspond to items (1) to (4) in the following description.

(1) Wiring from the remote controller

• Connect to the MA remote controller terminal block (TB15) on the indoor unit.

• The terminal block has no polarity. Connect to the terminal block at the rear bottom of the remote controller.

(2) Operating in a group (Groups 03, and 04 above)

• Interconnect the MA remote controller terminal block (TB15) of the indoor units you want to operate as a group, and connect the MA remote controller to that point.

• When the remote controller is used in combination with the system controller as shown in the figure above, group setting at the system controller (central controller in the figure above) is necessary.

(3) Number of connectable remote controllers (groups 02 and 04)

• A main remote controller and one sub remote controller, a total of two, can be connected to a group made up of indoor units.

NOTE: When using this Simple MA remote controller in combination with other MA remote

controllers, be sure to follow the compatibility rules below.

4 How To Wire Transmission Line

Connect to TB15 on the indoor unit.

a Outdoor unit b Indoor unit c LOSSNAY or

OA processing unit

d Main Remote Controller e Sub Remote Controller f Central controller g Power supply unit for

transmission line

Indoor unit function Main remote

controller

Sub remote controller

Compatibility

Models applicable for AUTO (dual set point) and SETBACK mode

This Simple MA remote controller

Compatible, and AUTO (dual set point) and SETBACK mode can be used depending on the indoor units to be connected.

Other MA remote controllers

This Simple MA remote controller

Compatible, but AUTO (dual set point) and SETBACK mode cannot be used.

This Simple MA remote controller

Other MA remote controllers

Incompatible

Models not applicable for AUTO (dual set point) and SETBACK mode

Combination with all of the above Compatible

TB5 TB15

TB7 TB3

TB5 TB15

TB7 TB3

(1)

(3)

(1)

(3)

(2)

(4)

(1)

dde d

Address = 51

Address = 01 Address = 02

Address = 55

Address = 08

Address = 07

Address = 03

Address = 04 Address = 09

Address = 06

Address = 05

Group 01 Group 02 Group 03

Group 04

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(4) To interlock to a LOSSNAY or OA processing unit, make the following settings using the remote

controller. (For a description of how to set an interlock, see section .) Set the LOSSNAY or OA processing unit address and the address of all the indoor units you want to interlock.

(5) Total length of remote controller wiring

• The simple MA controller can be wired up to 200 m (656 ft). Procure 0.75 - 1.25 mm

² (stranded 16

- 28 AWG), 2-core cable at the installation site.

2. Connecting to M-Series and P-Series air conditioner

The remote controller wiring depends on the system configuration. Check the system configuration. Wire the remote controller as shown in the example below. The numbers (1) to (3) in the figure correspond to items (1) to (3) in the following description.

[1] Connecting the remote controller for each refrigerant system (Standard 1:1, simultaneous twin,

simultaneous triple, simultaneous four, individual twin)

[2] When grouping by different refrigerant systems

* Set the refrigerant address using the outdoor unit dip switches. (For more information, refer to the

outdoor unit installation manual.)

* All the indoor units enclosed in are controlled as one group.

(1) Wiring from remote controller

• Connect to indoor unit TB5 (remote controller terminal block). (The terminal block has no polarity.)

• For simultaneous multi type, when mixing various types of indoor units, always connect the remote controller to the indoor unit with the most functions (wind velocity, vane, louver, etc.).

(2) When grouping with difference refrigerant systems

• Group using the remote controller wiring. Connect the remote controller to an arbitrary indoor unit of each refrigerant system you want to group.

• When mixing different types of indoor units in the same group, always make the outdoor unit connecting the indoor unit with the most functions (wind velocity, vane, louver, etc.) the Main unit (refrigerant address = 00). Also, when the Main unit is the simultaneous multi type, always satisfy the conditions of (1) above.

• The Simple MA Remote Controller can control up to 16 refrigerant systems as one group.

CAUTION

Remote controllers cannot be wired together. Only one wire can be connected to the remote controller terminal block.

Connect to TB5 on the indoor unit.

a Outdoor unit b Indoor unit d Main Remote Controller

(Simple MA Controller) e Sub Remote Controller (Simple MA Controller)

Ventilation Setting

NOTE: When interlocking the MA remote controller with a LOSSNAY or OA processing unit,

always set the address of all the indoor units in the group and the address of the LOSSNAY or OA processing unit.

(1)

(3)

TB5

TB4

TB1

TB4

(3)

(1)

TB4

TB5

TB1

TB4

TB5

TB1

TB4

TB5

(1)

(3)

dde

Refrigerant address = 00

Simultaneous twin Simultaneous twin Individual twin

TB4

TB4TB4

TB4

TB4TB4

TB1 TB1 TB1

TB1TB1

TB5

(2)

(1)

(3)

(1)

(2) (2)

(2)

aa a a

bbbbbbbb

Standard 1:1 Simultaneous twin

Simultaneous triple

Individual twin

Refrigerant address = 01 (Sub)

Refrigerant address = 03 (Sub)

Refrigerant address = 04 (Sub)

Refrigerant address = 00 (Main)

Refrigerant address = 02 (Sub)

– 7 –

(3) Up to two remote controllers can be connected to one group

• When two remote controllers are connected to one group, always set the Main remote controller and Sub remote controller.

• When only one remote controller is connected to one group, set it as the Main controller. When two remote controllers are connected to one group, set the Main remote controller and Sub remote controller. (For a description of how to set the Main/Sub switch, see step 5 in section

NOTE: When using this Simple MA remote controller in combination with other MA remote

controllers, be sure to follow the compatibility rules below.

(4) Total length of remote controller wiring

• The Simple MA Remote Controller can be wired up to 200 m (656-1/8 ft). Procure 0.75 ~ 1.25 mm

² (16 ~ 28 AWG), 2-core cable at the installation site.

This remote controller is for the wall installation. It can be installed either in the switch box or directly on the wall. When performing direct wall installation, wires can be thread through either back or top of the remote controller.

(1) Selecting an installation site

Install the remote controller (switch box) on the site where the following conditions are met. (a) A flat surface (b) A place where the remote controller can measure the accurate indoor temperature

Sensors to monitor indoor temperature are on the indoor unit and on the remote controller. When the room temperature is monitored with the sensor on the remote controller, the built-in sensor on the Main remote controller monitors the room temperature. When using the sensor on the remote controller, follow the instructions below.

Indoor unit function Main remote

controller

Sub remote controller

Compatibility

Models applicable for AUTO (dual set point) and SETBACK mode

This Simple MA remote controller

Compatible, and AUTO (dual set point) and SETBACK mode can be used depending on the indoor units to be connected.

Other MA remote controllers

This Simple MA remote controller

Compatible, but AUTO (dual set point) and SETBACK mode cannot be used.

This Simple MA remote controller

Other MA remote controllers

Incompatible

Models not applicable for AUTO (dual set point) and SETBACK mode

Combination with all of the above Compatible

CAUTION - The wiring cannot be connected to TB5 of the indoor unit of the same

refrigerant system. If so connected, the system will not operate normally.

- Remote controllers cannot be wired together. Only one wire can be connected to the remote controller terminal block.

- When connecting to TB5, connect up to two wires of the same size to one terminal block.

a Outdoor unit b Indoor unit d Main Remote Controller e Sub Remote Controller

5How To Install

How To Install

TB4

TB1

TB1 TB1

TB1

TB5

TB5 TB5 TB5

bbb bbb

aa a

Refrigerant address = 00

Refrigerant address = 01

Refrigerant address = 00

Simultaneous twin Standard 1:1 Simultaneous twin Standard 1:1

– 8 –

• To monitor the accurate indoor temperature, install the remote controller away from direct sunlight, heat sources, and the supply air outlet of the air conditioner.

• Install the remote controller in a location that allows the sensor to measure the representative room temperature.

• Install the remote controller where no wires are routed around the temperature sensor on the controller. (If wires are routed, the sensor cannot measure accurate indoor temperature.)

(2) Installation space

Leave a space around the remote controller as shown in the figure shown below, regardless of whether the controller is installed in the switch box or directly on the wall. Removing the remote controller will not be easy with insufficient space. Also, leave an operating space in front of the remote controller.

(3) Installation work

Controller can be installed either in the switch box or directly on the wall. Perform the installation properly according to the installation method.

1 Drill a hole in the wall.

■ Installation using a switch box

• Drill a hole in the wall, and install the switch box on the wall.

• Connect the switch box to the conduit tube.

■ Direct wall installation

• Drill a hole in the wall, and thread the cable through it.

2 Seal the cable access hole with putty

■ Installation using a switch box

• Seal the remote controller cable access hole at the connection of switch box and conduit tube with putty.

Do not install the controller in a place where the difference between the remote controller surface temperature and the actual room temperature will be great. If the temperature difference is too high, room temperature may not be adequately controlled.

To reduce the risk of malfunctions, do not install the controller in a place where water or oil may come into contact with the controller, or in a condensing or corrosive environments.

To avoid deformation and malfunction, do not install the remote controller in direct sunlight or where the ambient temperature may exceed 40ºC (104ºF) or drop below 0ºC (32ºF).

Do not install the remote controller directly onto electrically conductive objects such as metal plate that has not been painted.

Important

(1-3/16)

30 (1-3/16)

120 (4-3/4)

Temperature sensor

unit: mm (in)

External dimensions of remote controller

Minimum required space

around the remote

controller

Wall

Conduit tube

Locknut

Switch box

Seal the gap with putty.

Remote controller cable

Bushing

To reduce the risk of electric shock, malfunctions, or fire, seal the gap between the cables and cable access holes with putty.

– 9 –

3 Prepare the bottom case of the remote controller.

4 Connect the remote controller cable to the terminal block on the bottom case.

Peel off the remote controller cable sheath as shown below to connect to the terminal block properly. Secure the remote controller cable so that the peeled part of the cable will fit into the case.

■ Direct wall installation

• Seal the hole through which the cable is threaded with putty.

Top case Bottom case

16 (21/32)

6 (1/4)

Sheath

Unit: mm (in)

Connect the cable. (non-polarized)

2-core wire must not be seen on the back.

Insert the sheathed part of the cable inside the case, and then secure the cable.

Seal the gap with putty.

Route the cable behind the remote controller.

Remote controller cable

To reduce the risk of electric shock, shorting, or malfunctions, keep wire pieces and sheath shavings out of the terminal block.

Do not use solderless terminals to connect cables to the terminal block. Solderless terminals may come in contact with the circuit board and cause malfunctions or damage the controller cover.

Important

– 10 –

5 Install the bottom case.

Be sure to secure two places of the bottom case.

6 Cut out the cable access hole.

■ Direct wall installation (when running the cable along the wall)

• Cut out the thin-wall part on the cover (the shaded area in the right figure) with a knife or a nipper.

• Thread the cable from the groove behind the bottom case through this access hole.

7 Set the dip switches on the top case.

When using two remote controllers in one group, set the dip switches. When using two remote controllers in one group, specify the main and sub remote controllers using dip switch No. 1 shown below.

• When connecting only one remote controller to one group, it is always the main remote controller. When connecting two remote controllers to one group, set one remote controller as the main remote controller and the other as the sub remote controller.

• The factory setting is “Main”.

There are switches on the back of the top case. Remote controller Main/Sub and other function settings are performed using these switches. Ordinarily, only change the Main/Sub setting of SW1. (The factory settings are ON for SW1, 3, and 4 and OFF for SW2.)

■ Installation using a switch box ■ Direct wall installation

Setting the dip switches

SW No. SW contents Main ON OFF Comment

Remote controller Main/Sub setting

Main Sub

Set one of the two remote controllers at one group to “ON”.

Temperature display units setting

Celsius Fahrenheit

When the temperature is displayed in [Fahrenheit], set to “OFF”.

Cooling/heating display in AUTO mode

Yes No

When you do not want to display “Cooling” and “Heating” in the AUTO mode, set to “OFF”.

Indoor temperature display

Yes No

When you do not want to display the indoor temperature, set to “OFF”.

Remote controller cable

Refer to 4.

Refer to 1.

Single switch box

Roundhead cross slot screws

Seal the cable access hole with putty.

Refer to 4.

Wood screws

Remote controller cable

To avoid deformation and damage to the bottom case, do not overtighten the screws.

To avoid damage to the bottom case, do not make holes on it.

Important

– 11 –

8 Connect the connector to the top case.

Connect the connector on the bottom case to the socket on the top case.

9 Insert the wires into the clamp.

0 Install the top case on the bottom case.

Two mounting tabs are at the top of the top case. Hook those two tabs onto the bottom case, and click the top case into place. Check that the case is securely installed and not lifted.

1 2 3 4

OFF

Connect the connector.

To prevent malfunctions, do not remove the protective sheet or the circuit board from the top case.

To prevent cable breakage and malfunctions, do not hang the top controller casing hang by the cable as shown in the figure above.

Important

Clamp

Insert the wires.

Hold the wires in place with the clamp to prevent undue force from being applied to the terminal block and causing cable breakage.

Important

Wall

Should not be lifted.

When attaching the top casing to the bottom casing, push it until it they click into place. If they are not properly locked into place, they may fall, causing personal injury, controller damage, or malfunctions.

Important

– 12 –

■ Direct wall installation (when running the cable along the wall)

• Thread the cable through the access hole at the top of the remote controller.

• Seal the cut-out part of the cover with putty.

• Use a cable cover.

• Uninstalling the top case

1 Uninstalling the top case

Insert a flat-tip screwdriver with a blade width of 3-5 mm (1/8-7/32 inch) into the latches at the bottom of the remote controller and lift the latches. Then, pull up the top case.

Seal the gap with putty.

Use a cable cover.

Thread the cable through the top of the remote controller.

To prevent damage to the controller casing, do not force the flat-tip screwdriver to turn with its tip inserted in the slot.

Do not insert the flat-tip screwdriver too far. Doing so will damage the circuit board.

Important

– 13 –

1. Before making a test run, refer to the “Test Run” section of the indoor unit installation manual.

2. When the [ON/OFF] button and [TEMP. ] button are pressed simultaneously for 2 seconds or longer, test run is performed.

3. Stop the test run by pressing the [ON/OFF] button.

4. If trouble occurred during the test run, refer to the “Test Run” section of the indoor unit installation manual.

Perform this operation when you want to register the LOSSNAY or OA processing unit, confirm the registered units, or delete the registered units controlled by the remote controller.

The following uses indoor unit address 05 and LOSSNAY or OA processing unit address 30 as an example to describe the setting procedure.

[Setting Procedure]

1 Stop the air conditioner using the remote controller [ON/OFF] button. 2 Press and hold down the [ FAN] and [TEMP. ] buttons at the same time for two seconds. The

display shown below appears. The remote controller confirms the registered LOSSNAY or OA processing unit addresses of the currently connected indoor units.

3 Registration confirmation result

- The indoor unit address and registered LOSSNAY or OA processing unit address are displayed alternately.

6 Test Run

7 Ventilation Setting

COOL VENTI.

Indoor unit piping temperature

Display range: -4ºF (-20ºC) to 158ºF (70ºC) “-4ºF” or “158ºF” flashes on the display.

Test run time

The remaining time for test run is displayed. Display range: 2:00 to 0:01 After two hours, the test run stops automatically.

Make this setting only when interlocked operation with LOSSNAY or OA processing unit is necessary with CITY MULTI models. (This setting cannot be made with M-Series and P-Series air conditioners.)

– 14 –

- When LOSSNAY or OA processing unit are not registered

4 If registration is unnecessary, end registration by pressing and holding down the [ FAN] and

[TEMP. ] buttons at the same time for two seconds. If a new LOSSNAY or OA processing unit must be registered, go to step 1. Registration procedure. If you want to confirm another LOSSNAY or OA processing unit, go to step 2. Confirmation

procedure. To delete a registered LOSSNAY or OA processing unit, go to step 3. Deletion procedure.

<1. Registration procedure>

5 Set the address of the indoor unit to be interlocked with the LOSSNAY unit using the [TEMP.

]

and [TEMP. ] buttons. (01 to 50)

6 After setting, press the [ FAN] button and set the Lossnay address you want to register by

operating the [TEMP. ] and [TEMP. ] buttons. (01~50)

7 Press the [ON/OFF] button, and register the set indoor unit address and LOSSNAY address.

- Registration end display The indoor unit address and “IC” and LOSSNAY address and “LC” are alternately displayed.

- Registration error display If the address is not registered correctly, the indoor unit address and [ ], and the registered LOSSNAY (or OA processing unit address) and [ ] are alternately displayed.

Cannot be registered because the registered indoor unit or LOSSNAY or OA processing unit does not exist. Cannot be registered because another LOSSNAY or OA processing unit was registered at the registered indoor unit.

Indoor unit address

LOSSNAY or OA processing unit address

– 15 –

<2. Confirmation procedure>

8 Set the address of the indoor unit connected by the remote controller whose LOSSNAY or OA

processing unit you want to confirm using the [TEMP. ] and [TEMP. ] buttons. (01 to 50)

9 Press the [ON/OFF] button and [ FAN] button simultaneously for 2 seconds, and check the

LOSSNAY address registered at the set indoor unit address.

- Confirmation end display (When LOSSNAY is connected.) The indoor unit address and “IC” and registered LOSSNAY address and “LC” are alternately displayed.

- Confirmation end display (When LOSSNAY or OA processing unit is not connected.)

- Registered indoor unit address does not exist.

<3. Deletion procedure>

Use this procedure when you want to delete registration of indoor units connected by the remote controller and LOSSNAY or OA processing unit.

0 Confirm (see 2. Confirmation procedure) the LOSSNAY or OA processing unit you want to delete

and display the indoor units and LOSSNAY or OA processing unit confirmation results.

a Press the [TEMP. ] and [TEMP. ] buttons simultaneously for 2 seconds, and delete

registration of the LOSSNAY or OA processing unit address registered at the set indoor unit.

- Deletion end display Indoor unit address and “– –” and registered LOSSNAY or OA processing unit address and “– –”

are alternately displayed.

- Deletion error display When deletion was not performed properly.

+ 33 hidden pages

Mitsubishi Electric PAC-YT53CRAU Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual