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Service Handbook Service Handbook

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Dust, dirt or water infiltration into the cooling system can cause the refrigerator oil to deteriorate or cause the unit to malfunction. If the unit is turned off in the middle of a season, it may result in malfunctions.

1] Read Before Servicing

Check the type of refrigerant used in the system to be serviced

Thoroughly read the safety precautions at the beginning of this manual

Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant

Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be moved or replaced

If there is a leak of gaseous refrigerant and the remaining refrigerant is exposed to an open flame, a poisonous gas hydrofluoric acid may form. Keep workplace well ventilated

CAUTION

2] Necessary Tools and Materials

Tools and materials that may be used with R410A with some restrictions

Tools and materials that are used with R22 or R407C that may also be used with R410A

Tools and materials that must not be used with R410A

3] Piping Materials

  • Copper pipe materials
  • Types of copper pipes
  • Piping materials/Radial thickness
  • Thickness and refrigerant type indicated on the piping materials
  • Flare processing (O-material (Annealed) and OL-material only)
  • Flare nut

The flare processing dimensions for the tubes used in the R410A system are larger than those in the R22 system. The figures in the radial thickness column are based on Japanese standards and are given for reference only.

4] Storage of Piping

Storage location

Sealing the pipe ends

5] Pipe Processing

6] Brazing

Items to be strictly observed

Reasons

Notes

7] Air Tightness Test

8] Vacuum Drying (Evacuation)

Vacuum pump with a reverse-flow check valve (Photo1)

Standard of vacuum degree (Photo 2)

Required precision of vacuum gauge

Evacuation time

Procedures for stopping vacuum pump

Special vacuum drying

9] Refrigerant Charging

Reasons

Notes

10] Remedies to be taken in case of a Refrigerant Leak

11] Characteristics of the Conventional and the New Refrigerants

Chemical property

Pressure characteristics

12] Notes on Refrigerating Machine Oil

Refrigerating machine oil in the HFC refrigerant system

Effects of contaminants *1

The effects of contaminants in the refrigerating machine oil on the refrigeration cycle

1] System configuration ..17 [2] Types and maximum allowed length of cables ..19 [3] Switch settings and address settings ..20 [4] Example of system connection ..27 [5] An example of a system to which an MA- remote control is connected..28 [6] An example of a system to which an ME remote control is connected..38 [7] An example of a system to which both MA remote control and.

1] System configuration

Table of compatible indoor units

1) "Maximum total capacity of connectable indoor units" refers to the sum of the numerical values ​​in the indoor unit model names. 2) If the total capacity of the indoor units connected to a given outdoor unit exceeds the capacity of the outdoor unit, the indoor units will not be able to perform at the rated capacity when operated simultaneously. Select a combination of units so that the total capacity of the connected indoor units is at or below the capacity of the outdoor unit whenever possible.

2] Types and Maximum allowable Length of Cables

Wiring work (1) Notes

1 MA remote controller refers to MA remote controller (PAR-20MAA, PAR-21MAA), MA simple remote controller, and wireless remote controller. 4 When connected to the terminal block on the Simple remote control, use cables that meet the cable size specifications shown in brackets.

3] Switch Settings and Address Settings

Switch setting

3 It is recommended to use cables smaller than 0.75 mm2 (AWG18) for easy handling.

M-NET Address settings (1) Address settings table

Remove the signals from the outdoor unit (OC) if there are several outdoor units in a single system. Low noise mode is valid when Dip SW4-4 on the outdoor unit is set to OFF.

Demand control

4] Sample System Connection

5] An Example of a System to which an MA Remote Controller is connected

System with one outdoor unit (automatic address setup for both indoor and outdoor units) (1) Sample control wiring

Chain terminals M1 and M2 in the terminal block for the indoor-outdoor transmission line (TB3) in the outdoor units (OC, OS1, OS2) (Note) and terminals M1 and M2 in the terminal block for the indoor transmission line -out (TB5) to each indoor unit (IC). Connect terminals 1 and 2 on the terminal block for the MA remote control line (TB15) on the indoor unit (IC) to the terminal block on the MA remote control (MA).

  • An example of a system with one outdoor unit to which 2 or more LOSSNAY units are connected (manual address setup for both indoor and outdoor units)

Outdoor units in the same cooling circuit are automatically assigned as OC, OS1 and OS2 in order of capacity from large to small (if two or more units have the same capacity, in address order from small to large). An example of a system with one outdoor unit to which 2 or more LOSSNAY units are connected (manual address configuration for both indoor and outdoor units) (manual address configuration for both indoor and outdoor units for external ones).

  • Group operation of units in a system with multiple outdoor units (1) Sample control wiring
  • A system in which a system controller is connected to the transmission line for centralized control and which is pow- ered from an outdoor unit
  • An example of a system in which a system controller is connected to the indoor-outdoor transmission line (except LM adapter)

Connect the terminals M1 and M2 of the terminal block (TB5) of the indoor unit (IC) to the relevant terminals of the indoor-outdoor transmission line terminal block (TB5) of the LOSSNAY (LC). Connect the terminals M1 and M2 of the terminal block (TB5) of the indoor units (IC) to the appropriate terminals of the indoor-outdoor transmission line terminal block (TB5) of the LOSSNAY (LC).

6] An Example of a System to which an ME Remote Controller is connected

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1 and OS2. 51 to 100 Assign sequential addresses to the outdoor units in the same refrigerant circuit.

7] An Example of a System to which both MA Remote Controller and ME Remote Controller are connected

8] Restrictions on Pipe Length

Refrigerant pipe size

1] Outdoor Unit Components and Refrigerant Circuit

Front view of an outdoor unit

Refrigerant circuit

2] Control Box of the Outdoor Unit

3] Outdoor Unit Circuit Board

  • Outdoor unit control board
  • M-NET board
  • INV board
  • Fan board
  • Noise Filter

TP1,2 Control pins for indoor/outdoor transmission line TB7Terminal block for .. transmission line for centralized control TB3Indoor/outdoor . transmission block. 1] Functions and specifications of the MA and ME remote controllers ..61 [2] Group settings and lock settings via the ME remote controller ..62 [3] Interconnection settings via the MA remote controller ..66 [4] Using the built-in device the temperature sensor in the remote control..67.

1] Functions and Specifications of MA and ME Remote Controllers

Comparison of functions and specifications between MA and ME remote controllers

Remote controller selection criteria

2] Group Settings and Interlock Settings via the ME Remote Controller

Group settings/interlock settings

After step is completed, a subsequent press of button [ ] will bring up the address of another registered unit. Brings the address of the LOSSNAY unit that was interlocked with the indoor unit in step on the screen. Select the address of the indoor unit to be searched by pressing the button [TIMER SET ( ) or ( )] to advance or go back through the interlocked addresses.

CLOCK ON OFF] twice while either the address of the indoor unit or the address of the interlocked unit is shown on the display to clear the interlock setting. Each press of the [ ] button will show the address of a registered indoor unit and its unit type on the display.

Remote controller function selection via the ME remote controller

When set to "ON", the automatic operation mode is available for selection in the function selection mode. The left figure shows the screen that appears when the current temperature range setting is between 19 C and 30 C in the Cool/Dry mode, and the lower limit temperature is selected to set.]. As with the Cool/Dry mode, use the [CLOCK-ON-OFF] button and the [TIMER SET ( ) or ( )] to set the temperature range.

As with the Cool/Dry mode, use the [CLOCK-ON-OFF] button and [TIMER SET ( ) or ( )] to set the temperature range. 5 4 3) Setting temperature range for automatic mode. When set to ON, appears on the display during automatic operation mode.

3] Interlock Settings via the MA Remote Controller

LOSSNAY interlock setting (Make this setting only when necessary.) (1) MA Remote Controller (PAR-21MAA)

4] Using the built-in Temperature Sensor on the Remote Controller

Selecting the position of temperature detection (Factory setting: SW1-1 on the controller board on the indoor unit is set to OFF.)

1] Electrical Wiring Diagram of the Outdoor Unit

Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes.

2] Electrical Wiring Diagram of Transmission Booster

1] Refrigerant Circuit Diagram

Outdoor unit

2] Principal Parts and Functions

Outdoor unit Part

LEV1 (SC control) Adjusts the amount of bypass flow from the liquid pipe on the outdoor unit during cooling. It regulates the capacity of the heat exchanger by adjusting the operating frequency and the operation of the propeller fan according to the operating pressure. functions) Remarks Use Specifications Verification method.

Indoor Unit Part

1] Functions and Factory Settings of the Dipswitches

Outdoor unit (1) Control board

Only the switch on the OC or OS needs to be set for the setting to work on both devices. The switches on both the OC and OS must be set to the same setting for the setting to be effective. Heating: Outdoor temperature is low or low pressure is low.(page 23) . 4) The table below gives an overview of the factory settings for dip switches SW5-1 to SW5-4 and SW5-7.

During normal operation, leave the short-circuit connector on the steam connector to allow fault detection and protect the equipment from damage.

Function of the switch (Indoor unit) (1) Dipswitches

For details on setting the address, refer to the installation manual of the outdoor unit.

Function of the switch <Remote controller>

Master remote controller 101-150 Add 100 to the smallest address of all indoor units in the same group. Sub remote controller 151-200 Add 150 to the smallest address of all indoor units in the same group. The address range that can be set with the ME remote control is between 101 and 200.

2] Controlling the Outdoor Unit

Flowchart of initial operation

The compressor on the OC remains in operation and the compressor on the OS starts. The compressor on OS remains running, and the compressors on OS1 and OS2 start. The compressor on OC remains in operation and the compressor on OS1 starts.

The compressor on OS1 remains running and the compressor on OS2 starts. 2 The air conditioner load is too low for OC, OS1 and OS2 to operate simultaneously. On or after the emergency operation is completed, the compressor stops and the error code is displayed again on the remote control.

Communication circuit failure or when some of the outdoor units are turned off

When one of the following conditions is met, the emergency operation stops and the device makes an error stop. When an error is detected which does not allow the device to perform an emergency operation. When communication is restored, the emergency mode is canceled and the units enter normal operating mode.

When the outdoor unit is performing cooling operation, the operation mode of the connected indoor units that are not in cooling mode (stopped, fan, thermo-OFF) cannot be changed to heating by remote control. Cooling/heating can be prohibited (Thermo-OFF) with the external input to the indoor units.

3] Operation Flow Chart

Mode determination flowchart

Searching for indoor unit address, remote controller address and group information will start for about 3 minutes after power on. When the indoor unit to be controlled by the remote controller is missing, "HO PLEASE WAIT" continues to flash on the remote controller's display even after 3 minutes or more after the power is turned on. The system may go into error mode on the indoor unit or outdoor unit side.

However, when the outdoor unit performs a cooling function, the indoor units that are running will stop or the operation of these indoor units will be stopped even when the indoor unit mode switches from the fan mode to the heating mode.

Operations in each mode (1) Cooling operation

Similarly, when defrosting ends, the indoor unit returns to heating mode after receiving the defrosting command from the outdoor unit. When the inlet temperature of the indoor unit becomes 18°C ​​[64°F] or lower, the fan always runs (at low speed). The outdoor unit, indoor unit and solenoid valve operate in the same way as cooling when the compressor is on.

1] Items to be checked before a Test Run

2] Test Run Method

3] Operating Characteristic and Refrigerant Amount

Operating characteristic and refrigerant amount The following table shows items of particular importance

4] Adjusting the Refrigerant Amount

Symptoms

Amount of refrigerant

Amount of refrigerant to be added

If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change, which can lead to a loss of performance. Amount of refrigerant to be charged = 17.1 kg All pipes in the figure are liquid pipes. The result of the calculation would be 598.07 oz and it is rounded up to the nearest 1 oz.

5] Refrigerant Amount Adjust Mode

Procedures

Place all indoor units in test run mode and run the units in cooling mode. Run the unit for 5 minutes after adjusting the amount of refrigerant to determine its suitability. Run the unit for 5 minutes after adjusting the amount of coolant and check (Tc-TH3).

Check this item on the unit whose “Tc – TH3” value was used in the step above.).

6] The following symptoms are normal

7] Standard Operation Data (Reference Data)

Single unit (1) Cooling operation

Single unit (High-COP) (1) Cooling operation

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