Work precautions
• When touching the electric components such as circuit boards and fan motors, do not touch the components for more than 5 minutes after power-off, and then start working. If LED4 on the circuit board is lit, do not touch the electric components.
• Before replacing parts, repair troubled sections according to the instructions described in the troubleshooting.
• When servicing, always keep proper footing.
• When servicing, the power supply isolator must be turned off. Pay sufficient attention to avoid electrical shock or injury.
• Always connect the power wire properly.
• After completing repairs, check that the unit operates properly.
• Always wear gloves when servicing.
The part names in the texts are standardized with the part names in the parts catalog. (There are some exceptions.)
Lossnay core
Maintenance cover Control cover Air supply fan (SA) (outside unit)
Air supply fan (SA) (inside unit)
Damper plate
Air exhaust fan (EA) (outside unit) Air exhaust fan (EA) (inside unit)
Fix piece Hinge
Hinge Damper plate
LGH-150RVXT-E: 2 pieces LGH-200/250RVXT-E: 3 pieces
OA: Outdoor air RA: Return air Air filter for RA
Air filter for OA
Cover plate
Maintenance cover (for the motors)
<Names of the components>
(1) Turning power off
1 Shut down the unit.
2 Turn off the power supply isolator.
(2) Fan parts
1 Unscrew the black screws (three special screws 4×8, indicated by ) to remove the cover plate.
Cover plate Precaution
When servicing, power supply to M-NET must be turned off. Live-line working may cause a circuit board failure.
Control cover
3 Unscrew the screws (eight PTT screws 4×8, indicated by
) for the maintenance cover (for the motors) on the bot- tom side of the main unit.
Maintenance cover (for the motors) 4 Open the maintenance cover (for the motors).
5 Unscrew the screws (three PTT screws 4×8, indicated by
) to remove the connector cover.
2 Check that LED4 on the control circuit board is OFF.
Control circuit board
LED 4
Maintenance cover (for the motors)
6 Disconnect the connectors.
7 Unscrew the screws (four PTT screws 5×10, indicated by ) for the fan base of the air supply fan (outside unit).
Notes:
• The fan bases of the inside units are not provided with these screws.
• The figure and picture show the air supply fan assembly. Remove the screws for the air exhaust fan (out- side unit) in the same way.
For LGH-250RVXT-E
Fan base For LGH-250RVXT-E
8 Slide the fan base toward back side.
Note: The inside units cannot be moved.
Fan base Precaution
When disconnecting the motor connectors, make sure that the power supply is turned off. Even when the fan motor is stopped, disconnecting the live-line connectors will cause a motor malfunction.
9 Unscrew the screws (indicated by ) to remove the motor fix plate, and then remove the air supply fan motor.
Note: Remove the other motors in the same way.
Motor fix plate Motor
(Six PTT screws 5×10, indicated by )
Motor fix plate Motor
(Six PTT screws 5×10, indicated by ) For LGH-150RVXT-E and LGH-200RVXT-E
For LGH-250RVXT-E
(3) Terminal block parts
1 Unscrew the screws (four PTT screws 4×8, indi- cated by , and two PT screws 4×8, indicated by
) to remove the control cover.
Control cover
2 Check that LED4 on the control circuit board is OFF.
3 Disconnect the connectors (indicated by ) from the power circuit boards and reactors.
4 Remove the screw (one PT screw 4×8 BS) and lock washer (4) (indicated by ).
5 Unscrew the screws (one PT screw 4×8, indicated by , and one PPT screw 4×20, indicated by ), and remove the terminal block with the lead wires.
Terminal block Lead wire
For LGH-150RVXT-E and LGH-200RVXT-E For LGH-250RVXT-E
Control circuit board
Power circuit board Reactor
Reactor Control circuit board
Power circuit board
LED 4 LED 4
(4) Control circuit board
1 Remove the cover plate. → See (2) 1.
2 Check that LED4 on the control circuit board is OFF, and then disconnect the connectors (indicated by ) from the control circuit board.
3 Unscrew the screws (two PT screws 4×8, indicated by
), and remove the control circuit board.
Control circuit board (LG-X05DC-E.C)
LED 4
Reactor
(5) Power circuit boards
Control circuit board
3 Remove the screw (one PT screw 4×8 BS for each) and lock washer (4) (indicated by ).
4 Unscrew the screw (one PT screw 4×8 for each, indicated by ), and remove the power circuit board.
1 Remove the control cover. → See (3) 1.
2 Check that LED4 on the control circuit board is OFF, and then disconnect the connectors (indicated by ) from the power circuit boards.
For the fan motor
For the terminal block
LED 4
Control circuit board (LG-X05DC-E.C)
Power circuit board 2 (LG-X05DC-E1) Power circuit board 1
(LG-X05DC-E.P)
For the terminal block
For the fan motor
Precaution
Be aware of the difference between the power circuit boards.
For LGH-150RVXT-E and LGH-200RVXT-E
Power circuit board 2 (LG-X05DC-E1) Power circuit board 1 (LG-X05DC-E.P)
1 Remove the control cover. → See (3) 1.
2 Check that LED4 on the control circuit board is OFF, and then disconnect the connectors (indicated by ) from the power circuit boards.
Precaution
Top right power circuit board is different from the other power circuit boards.
Control circuit board (LG-X05DC-E.C)
LED 4
Top right power circuit board (LG-X05DC-E.P) Top left power circuit board
(LG-X05DC-E1)
Bottom right power circuit board (LG-X05DC-E1)
Bottom left power circuit board (LG-X05DC-E1) For LGH-250RVXT-E
3 Remove the screw (one PT screw 4×8 BS for each) and lock washer (4) (indicated by ).
4 Unscrew the screw (one PT screw 4×8 for each, indicated by ), and remove the power circuit board.
LED 4
Top right power circuit board (LG-X05DC-E.P) Top left power circuit board
(LG-X05DC-E1)
Bottom right power circuit board (LG-X05DC-E1)
Bottom left power circuit board (LG-X05DC-E1)
(6) Reactors
1 Remove the control cover. → See (3) 1.
2 Check that LED4 on the control circuit board is OFF.
→ See (2) 2.
3 Unscrew the screws (six PTT screws 4×8, indicated by ), and remove the control base from the main unit.
4 Unscrew the screws (three PT screws 4×8, indicated by ), and remove the sub control base.
Control base Sub control base
5 Unscrew the screws (two PT screws 4×8 for each, indi- cated by ) to remove the reactors.
Note: LGH-150/200RVXT-E Lossnay has four reactors.
Reactor (White) Reactor (Yellow)
Assembly precaution
Number indications are attached on the lead wires.
When replacing the reactors, install them to the correct position, and reconnect the lead wires according to the numbers shown in the picture.
1
2
3
4
5
6
7
8
For LGH-150RVXT-E and LGH-200RVXT-E
1 Remove the control cover. → See (3) 1.
2 Check that LED4 on the control circuit board is OFF. → See (2) 2.
3 Unscrew the screws (ten PTT screws 4×8, indicated by ), and remove the control base from the main unit.
4 Unscrew the screws (three PT screws 4×8, indicated by ), and remove the sub control base.
Sub control base
5 Unscrew the screws (two PT screws 4×8 for each, indi- cated by ) to remove the reactors.
Note: LGH-250RVXT-E Lossnay has ten reactors.
Assembly precaution
Number indications are attached on the lead wires.
When replacing the reactors, install them to the correct position, and reconnect the lead wires according to the numbers shown in the picture.
1 2
3 4
11 12
5 6
13 14
15 16
17 18
19 20 7
8
9 10
Reactor Reactor (Yellow)
Reactor (Yellow) For LGH-250RVXT-E
Control base
(7) Lossnay cores and GM assemblies
1 Unscrew the black screw (one special screws 4×8, indi- cated by ) for the fix piece.
Fix piece Maintenance cover 2 Slide the fix piece toward the left side.
Fix piece 3 Disengage the hinges, and open the maintenance cover.
Maintenance cover Hinge
4 Draw the Lossnay cores and filters from the main unit. Air filter (RA) Lossnay core
5 Unscrew the screws (two PTT screws 4×8, indicated by ) to remove the separate plate.
Separate plate
6 Unscrew the screws (two PTT screws 4×8, indicated by
) to remove the cover.
Cover 7 Disconnect GM connectors.
For LGH-150RVXT-E and LGH-200RVXT-E For LGH-250RVXT-E
8 Unscrew the screws (two PTT screws 4×8, indicated by
) to remove the GM assembly from the main unit.
Note: LGH-250RVXT-E Lossnay has two GM assem- blies. See 9 and 0 for removing the other GM assembly.
GM assembly
9 Unscrew the screws (two PTT screws 4×8, indicated by ) to remove the GM assembly from the main unit.
For LGH-250RVXT-E
For LGH-250RVXT-E
0 Unscrew the screws (two PTT screws 4×8, indicated by
) to remove the GM plate from the GM assembly.
GM assembly GM plate
GM assembly GM assembly
When reassembling
Reassemble the unit in the reverse order of disassembly.
After reassembly, always make a test run to be sure that the unit operates properly.
(8) Thermistors
1 Remove the cover. → See (7) 1 to 6.
2 Disconnect the thermistor connectors.
Connector for the thermistor (RA)
Connector for the thermistor (OA) 3 Unfasten the clampers, and remove the thermistors.
Thermistor (RA) Clamper
Clamper Thermistor (OA)
Step Details Check item 1 Check the system configuration.
Check if PZ-61DR-E is connected to the circuit board to be replaced. PZ-61DR-E connection The following describes settings required when replacing the circuit boards per the
system configuration.
Check which system configuration is applicable, and then replace the circuit boards.
System Configuration
PZ-61DR-E
Remote controller cable
Lossnay Lossnay Setting of the function selection switches on the circuit board.
Setting of the PZ-61DR-E functions.
Address setting (when M-NET is used).
Go to Step 2.
(A)
Lossnay M-NET transmission cable
Interlock
City Multi indoor unit
Air conditioner remote controller
Setting of the function selection switches on the circuit board.
Address setting.
Go to Step 3.
(B)
2 Check the settings on PZ-61DR-E.
Regarding the settings on PZ-61DR-E, prepare the data recorded at the time of installation (setting status record, etc.).
In the case there is no data recorded at the time of installation, and if the Lossnay unit can be operated with PZ-61DR-E, use the form in "(11) Setting status record"
(page 51) to record the settings on PZ-61DR-E.
To check the settings on PZ-61DR-E, see the Lossnay technical manual or remote controller manual.
• On the function setting screen of PZ-61DR-E, display the M-NET address of the Lossnay unit for which you wish to check the settings.
• The address can be checked by the address setting switches (SA1 and SA2) on the Lossnay circuit board.
Setting status record
3 Setting status record of the address setting switches and function selection switches on the circuit board Using the form in "(11) Setting status record" (page 51), record setting statuses nec-
essary for replacing the circuit board.
Remove the control cover, and check the setting status of each switch on the circuit board.
If the function setting statuses were recorded at the time of installation, this step can be skipped.
1 Address setting (SA1 and SA2)
2 Function selection switches and model selection switch setting (SW2, SW5, and SW6)
3 External input (as necessary, record the connection status)
Setting status record
(9) Procedures for replacing the circuit boards
Notes
• Before removing the circuit boards for replacement, check the following Steps 1 and 2.
• When the Lossnay remote controller PZ-61DR-E is connected, make sure to replace the circuit boards as described in the Steps.
Step Details Check item 4 Removing the circuit boards
• For the working precautions, see page 35.
• For removing the circuit boards, see (4) Control circuit board (page 39) or (5) Power circuit boards (page 40 and 41).
5 Attaching the circuit boards
1 According to the function status record data prepared in Step 3, set the address setting switches, function selection switches, and model selection switch of the new circuit board.
a. Address setting (SA1 and SA2)
b. Function selection switches and model selection switch setting (SW2, SW5, and SW6)
Address set- ting
Function set- ting
Model selection 2 Attach the power circuit board in the reverse order of the steps for removing.
Make sure to connect the connectors listed in the following table.
Connector Symbol on the circuit board Check For power supply connection TAB1, TAB2, TAB5
For exhaust fan motor connection CN9 For supply fan motor connection CN10 For damper motor connection CN7
For control circuit board connection CN118, CN119, CN121
Circuit board fixing screw (1 pc.) PCB case fixing screw (1 pc.) Earth fixing screw (1 pc.) 3 Reattach the PCB fix plate of the control circuit board, and then attach the con-
nectors, remote controller transmission cable, M-NET transmission cable, and external signal cable, etc.
Make sure to connect the connectors or terminals listed in the following table.
( Connect PZ-61DR-E transmission cable terminal, M-NET transmission cable ter- minal, and connector/terminal for external signal cable only when they are used.)
Connector and terminal Symbol on the circuit board Check For thermistor connection (outdoor
temperature (OA)) CN22
For thermistor connection (indoor tem-
perature (RA)) CN5
For power circuit board connection CN18, CN19, CN21 PZ-61DR-E transmission cable terminal TM4 12
M-NET transmission cable terminal TB5 [A] [B]
For external signal cable connection TM2, TM3, CN17, CN26, CN32
Connector connection PZ-61DR-E transmission cable con- nection M-NET trans- mission cable connection External signal cable connection
4 Reattach the control cover. Cover screw (6 pcs.)
Step Details Check item 6 Function setting with PZ-61DR-E
When PZ-61DR-E is connected, according to the function status record data pre- pared in Step 2, set the function settings with PZ-61DR-E.
If PZ-61DR-E is not connected, skip this step and proceed to Step 7.
To perform function settings with PZ-61DR-E, see the Lossnay technical manual or remote controller manual.
The selection method for "M-NET address" on the function setting screen differs between when the address setting switch on the Lossnay circuit board is set (the address is other than "00") and when it is not set (the address is "00"). Check the ad- dress setting of the replaced circuit board.
<When the address switch setting is other than "00">
For all function settings, always select the address of the Lossnay unit which the circuit boards were replaced.
Even when there are multiple Lossnay units in the group, do not select "All".
<When the address switch is "00">
Always select "All".
Note:
• When changing the settings of the function selection switches and address setting switches on the circuit board after the functions were set with PZ-61DR-E, reset the function settings according to "(10) Initialization" (page 50).
After resetting the function settings, perform the function settings again in the order of Step 5 1 and Step 6.
• If you change the M-NET address after the functions were set with PZ-61DR-E, the settings with PZ-61DR-E will be reset. In this case, set the functions again with PZ- 61DR-E.
Address set- ting
Function set- ting
7 Restarting the system
Turn the power back on to the Lossnay unit which the circuit boards have been re- placed, or when using M-NET, turn the power back on to the power supply unit con- nected to the Lossnay unit.
In trial operation, make sure that the Lossnay unit with replaced circuit boards oper- ates properly, and finish replacement work.
Trial opera- tion
(10) Initialization
Set to initialize the remote controller PZ-61DR-E function setting.
All function settings which are changed by users are cancelled.
DIP-SW Setting
check
PZ-61DR-E Setting
check Initialization
SW No. Setting Function No. Setting Data
N/A - -
100 0 N/A
- - 1 Available
(11) Setting status record
1 Basic information Date:
Installation location:
Model name: LGH- ( 150 . 200 . 250 ) RVXT-E Serial number on the nameplate (eight-digit):
Address setting:
Lot number marked on the circuit board:
Microcomputer software version marked on the circuit board:
Lossnay remote controller: ( Used . Not used ) Model name:
Interlock setting: ( Set . Not set ) Model name:
System controller: ( Used . Not used ) Model name:
The number of Lossnay units in a group:
Address number (The smallest number in the group):
Function No. Setting Data Function No. Setting Data Function No. Setting Data Function No. Setting Data
1 （0） 28 （0） 39 （7） 56 （0）
2 （0） 30 （0） 40 （0） 57 （0）
5 （0） 31 （5） 41 （7） 58 （0）
6 （0） 32 （2） 42 （7） 59 （0）
7 （0） 33 （0） 51 （0） 60 （0）
8 （0） 34 （0） 52 （0） 61 （0）
9 （0） 36 （0） 53 （6） 62 （0）
13 （0） 37 （0） 54 （1） 63 （0）
14 （0） 38 （0） 55 （0） 100 （0）
15 （0）
Terminal or connector
on the circuit board Function Name Used Not used Connected device
TM2 123 External control input □ □
CN32 Remote/local switching □ □
CN17 12 Fan speed 4 input □ □
CN17 13 Fan speed 3 input □ □
CN17 14 Fan speed 2 input □ □
CN17 15 Fan speed 1 input □ □
CN26 12 Bypass mode input □ □
CN26 45 Fan speed switching input (0 to 10 V DC) □ □
TM3 70 Bypass monitor or Pre-heater output □ □
TM3 80 Malfunction monitor output □ □
TM3 90 Operation monitor output □ □
2 Function selection switches
Enter the setting status of the function selection switches on the circuit board.
3Function settings
Enter the setting data of the functions set with PZ-61DR-E.
( ) : Factory setting
4 External input
Enter the usage of the external input/output on the control circuit board.
Model SW6-1 SW6-2 SW6-3 SW6-4
LGH-150RVXT-E OFF ON OFF ON
LGH-200RVXT-E ON ON OFF ON
LGH-250RVXT-E OFF OFF ON ON
SW2 ON OFF SW5 ON OFF SW6 ON OFF
1 □ □ 1 □ □ 1 □ □
2 □ □ 2 □ □ 2 □ □
3 □ □ 3 □ □ 3 □ □
4 □ □ 4 □ □ 4 □ □
5 □ □ 5 □ □
6 □ □ 6 □ □
7 □ □ 7 □ □
8 □ □ 8 □ □
9 □ □ 9 □ □
10 □ □ 10 □ □ : Factory setting
Note: SW6 setting differs according to the model.