Mitsubishi Electric LGH-F300RVX-E User manual

Warning:
Repair work must be performed by the manufacturer, its service
agent or a similarly qualified person in order to avoid hazards.
LOSSNAY ENERGY RECOVERY VENTILATOR
HANDBOOK
MODELS
LGH-F300RVX-E
LGH-F470RVX-E
LGH-F600RVX-E
LGH-F1200RVX-E
December 2019 No. U285
Remote controller (Optional)
PZ-61DR-E
PZ-43SMF-E
Filter (For replacement)
PZ-50RF8-E
PZ-80RF8-E
PZ-100RF8-E
Nameplate
Nameplate

Contents
Contents
1. Safety precautions .......................................................................... 3
2. Changed points............................................................................... 4
3. Specifications.................................................................................. 4
4. Outside dimensions ........................................................................ 5
5. Electrical wiring diagrams ............................................................... 8
6. Circuit board diagrams.................................................................. 10
7. Troubleshooting ............................................................................ 12
7-1 Service flowchart ....................................................................................12
7-2 Check details ..........................................................................................13
8. Overhauling procedures................................................................ 37
9. Parts catalog ................................................................................. 50
LGH-F300RVX-E ..........................................................................................51
LGH-F470RVX-E ..........................................................................................59
LGH-F600RVX-E ..........................................................................................67
LGH-F1200RVX-E ........................................................................................75
3
4
4-5
5-7
8-9
10-11
12-36
12-13
13-36
37-49
50-82
51-58
59-66
67-74
75-82

─ 3 ─
Read the following precautions thoroughly before the maintenance, and then inspect and repair the product in a
safe manner.
The types and levels of danger that may arise if the product is handled improperly are described with the warning
symbols shown below.
Warning
Modification is prohibited
Do not modify the unit.
( Failure to observe this warning may result
in electric shock, fire and/or injury. )
Electric shock
If you must inspect the circuitry while the power is
on, do not touch the live parts.
( Failure to observe this warning may result
in electric shock. )
Check insulation
Upon completing repair work, always measure the insula-
tion resistance. Verify that it is at least 10 MΩ (with a 500-
V DC insulation resistance tester), and then turn on the
power.
(Inadequate insulation may result in
electric shock.)
Improper handling of the product may
result in serious injury or death.
Caution
Improper handling of the product may result in injury or
damage to properties including buildings and equipment.
Proper electric work
Use the electric wires designated for electric work,
and conduct electric work in accordance with your
local "Electric Installation Engineering Standard",
the "Indoor Wiring Regulations" and the installation
instructions.
(Improper connection or wiring installation
may result in electric shock and/or fire.)
Replace damaged and/or degraded parts
Be sure to replace the power cord and lead wires if
they are damaged and/or degraded.
( Failure to observe this warning may result
in electric shock and/or fire. )
Use proper parts and tools
For repair, be sure to use the parts listed in the
service parts catalog of the applicable model and
use the proper tools.
( Failure to observe this warning may result
in electric shock, fire and/or injury. )
Caution against
electric shock
Prohibited
Be sure to follow
this instruction.
Turn off the power supply
Be sure to shut off the power supply isolator before
disassembling the unit for repair.
( Failure to observe this warning may result
in electric shock. )
Make sure that the product operates properly upon completion of repair. Clean the product and the surrounding
area, and then notify the customer of the completion of repair.
Caution for injury
Do not work at a location where you do not have a
sure footing.
( Failure to observe this caution may result
in a fall. )
Notes for servicing
● Inspect the earth condition, and repair it if it is incomplete. Make sure that a power supply isolator and an over-
load protection device are installed. If they are not installed, recommend the customer to install them.
Be sure to follow
this instruction.
Wear gloves
Wear gloves when servicing.
(Failure to observe this caution may result
in injury to your hands from sharp metal or
other edges.)
1. Safety precautions
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Prohibited

─ 4 ─
2. Changed points
New model Former model Changes from the former model
LGH-F300RVX-E LGH-F300RX5-E Circuit board: Newly designed
Motor: Changed from AC motor to DC motor
Operation in extremely cold regions: Unavailable
LGH-F470RVX-E LGH-F470RX5-E
LGH-F600RVX-E LGH-F600RX5-E
LGH-F1200RVX-E LGH-F1200RX5-E
3. Specifications
Model name
Running
current
(A)
Input
power
(W)
Air volume Static pressure Exchange efficiency (%) Noise
(dB)
Dia. of the
centrifugal
fan
(Inch (mm))
Weight
(CFM)
(CMH) (W/CFM) (in W.G) (Pa) Temperature
Enthalpy
Below
the unit
(lbs) (kg)
Heating Cooling
LGH-F300RVX-E 1.06 155 300 510 0.52 0.46 115 65.5 63.0 50.0 34.0 8 3/4 (220) 75 34
LGH-F470RVX-E 2.15 348 470 799 0.74 0.60 150 69.0 64.0 51.0 34.5 9 5/8 (245) 110 50
LGH-F600RVX-E 2.70 438 600 1019 0.73 0.66 164 67.0 64.0 50.0 37.0 9 5/8 (245) 123 56
LGH-F1200RVX-E 5.40 880 1200 2039 0.73 0.59 147 67.0 64.0 50.0 41.0 9 5/8 (245) 251 114
* The above values apply during energy recovery ventilation when the fan speed is set to Fan speed 4 at the
rating pressure loss and 230 V / 60 Hz.
* For the specifications at the other frequency or voltages, see the spec. sheets.
* The values given in the table for the noise level reflect the levels measured at a position 4.9 feet (1.5 m)
immediately below the unit in an anechoic chamber.
* Noise change or increase may occur because of the Bypass-Automatic function or Automatic fan speed
change by timer setting and/or other functions.
* Temperature Exchange efficiency (%) are average of summer and winter condition.
* Mitsubishi Electric measures products according to Japan Industrial Standard (JIS B 8628:2003), therefore
characteristic values are measured by chamber method.
* On-site commissioning measurements by pitot tube method could be as much 20% difference from JIS test
room conditions. If the measuring point is close to sources of turbulence like bends, contractions and damp-
ers, etc., it is difficult to measure air volume correctly. A straight duct length more than 10 D (D=duct diame-
ter) from the source of turbulence is recommended for correct measurement. On-site measurement should
therefore be measured in accordance with BSRIA guideline (Commissioning Air System. Application proce-
dures for buildings AG3/89.3 (2001))
Model name LGH-F300RVX-E, LGH-F470RVX-E, LGH-F600RVX-E, LGH-F1200RVX-E
Heat exchange system Energy recovery ventilating system
Heat exchanger material Special treated paper plate heat exchanger
Cladding Galvanized steel sheet
Heat insulation material Self-extinguishing urethane foam
Motor EC motor
Filter Non-woven fabrics filter (EU-G3)
Surrounding air condition Shall be between 14°F (-10°C) and 104°F (40°C), 80%RH or less
Suction air condition Shall be lower than 104°F (40°C), 80%RH
Supply fan operation under
low outdoor temperature
14°F (-10°C) to 5°F (-15°C) : Intermittent operation 60 min ON, 10 min OFF
5°F (-15°C) or less: Intermittent operation 55 min OFF, 5 min ON
Function Energy recovery ventilation/Bypass ventilation, Fan speed 1, 2, 3, 4
Electrical power supply Single phase 208-230 V / 60 Hz
Insulation resistance 10 MΩ or more
Dielectric strength 1000 V AC 1 minute

─ 5 ─
Remote controller
Model name PZ-61DR-E PZ-43SMF-E
Power supply requirement 12 V DC (Supplied from Lossnay unit)
Power consumption 0.3 W
Transmission cable Non polarized 2-wire (AWG 22 (0.3 mm2) sheathed cable)
Total wiring length 219 yd. (200 m) maximum
Number of controllable Lossnay units 15 Lossnay units maximum (Max. 2 remote controllers installable)
Environmental condition Temperature: 32 to 104ºF (0 to 40°C)
Humidity: 30% to 90% relative humidity (no condensation)
Weight 9/16 lb. (0.25 kg) 7/32 lb. (0.10 kg)
Color Munsell 1.0Y9.2/0.2
4. Outside dimensions
LGH-F300RVX-E, LGH-F470RVX-E, LGH-F600RVX-E
N
J
JA
F
C
F
K L
B
E
D
M
13/16 (20)
M
φG φH
N
4 17/32 (115)
EA
(exhaust air outlet)
Air exhaust fan
OA
(outside air intake)
Core, air lter,High-
E󰀩ciency lter, fan,
maintenance space
More than 23 5/8 (600)
Position where duct
direction change is possible
Air lters
Lossnay core
Inspection
opening
1.5 x 1.5 ft (450 x
450) or more
Control box
Maintenance cover
Air supply fan
RA
(return air)
SA
(supply air)
By-pass damper plate
Position where duct direction change is possible
High-E󰀩ciency lter (sold separately) attachment position
Ceiling suspension xture
(4-9/16 X 13/16 (4-15 X 20) oval)
Power supply
cable opening
5 7/8 ~ 9 7/8 (150~250)
Model Dimensions
Ceiling suspension fixture pitch Nominal
diameter
Duct connecting flange Duct pitch
Weight
lbs (kg)
A B C D E F G H J K L M N
LGH-F300RVX-E
34 15/16
(888)
40
(1016)
13 1/32
(331)
34 1/2
(875)
41 7/8
(1063)
3 11/32
(85)
7 7/8
(200)
7 9/16
(192)
8 3/16
(208)
3 1/8
(79)
29 3/8
(745)
5 5/16
(135.5)
4 7/8
(124)
1 3/16
(30)
75
(34)
LGH-F470RVX-E
45 1/16
(1144)
39 1/2
(1004)
15 29/32
(404)
44 17/32
(1131)
41 3/8
(1051)
3 1/32
(77)
9 7/8
(250)
9 1/2
(242)
10 3/16
(258)
3 1/8
(79)
27 3/16
(690)
6 3/16
(157)
6 1/2
(165)
1 37/64
(40)
110
(50)
LGH-F600RVX-E
45 1/16
(1144)
48 1/2
(1231)
15 29/32
(404)
44 17/32
(1131)
50 5/16
(1278)
3 1/32
(77)
9 7/8
(250)
9 1/2
(242)
10 3/16
(258)
3 1/8
(79)
36 1/8
(917)
6 3/16
(157)
6 1/2
(165)
1 37/64
(40)
123
(56)
Unit: Inch (mm)

─ 6 ─
LGH-F1200RVX-E
Weight lbs (kg): 251 (114)
39 3/4 (1010)
36 1/8 (917)
36 1/8 (917)
50 1/8 (1272)
48 1/2 (1231)
45 1/16 (1144) 3 1/8 (79)1 3/4 (44)
27 9/16 (700)
1 37/64 (40)
1 37/64
(40)
1 37/64
(40)
10 5/8 (270)
10 5/8 (270)
5 7/8 ~ 9 7/8 (150 ~ 250)
More than 23 5/8 (600)
ø9 1/2
(ø242)
ø10 3/16
(ø258)
ø9 1/2
(ø242)
ø10 3/16
(ø258)
15 29/32
(404)
31 13/16 (808)
1 1/32 (26)
4 5/16 (110)
Ceiling suspension xture
(4-9/16 X 1 3/16 (4-15 X 30) oval)
SA
(supply air)
RA
(return air)
EA
(exhaust
air outlet)
OA
(outside air
intake)
Core, air lter,
High-E󰀩ciency
lter, fan,
maintenance
space
Lossnay cores
Air exhaust fan
By-pass damper plate
Air supply fan
Maintenance cover
Inspection
opening
1.5 x 1.5 ft (450 x
450) or more
Air lters
Power supply cable
opening
Control box
High-E󰀩ciency lter (sold separately) attachment position
Unit: Inch (mm)

─ 7 ─
PZ-61DR-E PZ-43SMF-E
422/32 (120)
3/4 (19)
423/32 (120)
23/4 (70)19/32 (15)
423/32 (120)
Unit: Inch (mm) Unit: Inch (mm)
PZ-50RF8-E, PZ-80RF8-E, PZ-100RF8-E
Model Dimension The number of
filters per set Applicable model
A B C Supply Exhaust
PZ-50RF8-E 18 1/2
(470)
7 13/64
(183)
19/32
(15) 2 2 LGH-F300RVX-E
PZ-80RF8-E 21 19/64
(451)
9 9/16
(243)
19/32
(15) 2 2 LGH-F470RVX-E
PZ-100RF8-E 22 1/4
(565)
9 9/16
(243)
19/32
(15)
2 2 LGH-F600RVX-E
4 4 LGH-F1200RVX-E
Notes:
• Each Lossnay unit is provided with one set of the filters. (Two sets for LGH-F1200RVX-E)
Unit: Inch (mm)

─ 8 ─
5. Electrical wiring diagrams
LGH-F300RVX-E, LGH-F470RVX-E, LGH-F600RVX-E
7
8
9
10
S
A
B
1
2
1
2
N
L
N
PE
L
M1
M2
GM CN7
CN118
CN119
CN10
CN9 TAB3, 4
REACTOR
TAB2 TAB1
ISOLATOR
TH1 (OA)
TH2 (RA)
LINE
FILTER
SUPPLY
FAN MOTOR
EXHAUST
FAN MOTOR
TM1
CN19
CN18
CN22
CN5
SA2SA1 SW5
SW2
3
POWER
SUPPLY
TM2
TB5
TM4
TM3
12 V or
24 V DC
Mr. Slim
(Non-polar)
M-NET
transmission cable
Shield Wire
2nd remote controller
(Max 2 controllers)
2nd Lossnay unit
(Max 15 units)
(*1) MAX 240 V AC 1 A MIN 208 V AC 100 mA
24 V DC 1 A 5 V DC 100 mA
Operation
monitor output (*1)
Bypass monitor or
Pre-heater signal output (*1)
PZ-
61DR-E
Malfunction
monitor output (*1)
CN26 (WH)
CN32 (WH)
CN17 (RE)
COM
(Field supply)
Volt-free
contact
Upper Printed
Circuit Board
(Control circuit board)
LED1
LED2
LED4
LED3
Lower Printed
Circuit Board
(Power circuit board)
LED6
X13
X14
X15
TAB5
CN20 (GR)
SW7
CN105 (RE)
208-230 V ～60 Hz
Definition of symbols
M1: Motor for exhaust fan X13: Relay contact CN20: Unused
M2: Motor for supply fan X14: Relay contact CN26: Connector (By-pass, 0-10 V DC Fan speed control)
GM: Motor for By-pass damper X15: Relay contact CN32: Connector (Remote control selection)
TH1: Thermistor for outside air CN5: Connector (Thermistor RA) CN105: Connector (IT communication)
TH2: Thermistor for return air CN7: Connector (Motor for By-pass damper) SA1: Address setting rotary switch (10 digit)
SW2,5,7: Switch (Function selection) CN9: Connector (Fan motor) SA2: Address setting rotary switch (1 digit)
TM1: Terminal block (Power supply) CN10: Connector (Fan motor) LED1 to LED3: Inspection indicator lamp
TM2: Terminal block (External control input) CN17: Connector (Fan speed 1/2/3/4) LED4, LED6: Power supply indicator lamp
TM3: Terminal block (Monitor output) CN18: Connector SYMBOL : Terminal block
TM4: Terminal block (Transmission cable) CN118: Connector : Connector on PCB
TB5: Terminal block (M-NET Transmission cable) CN19: Connector
TAB1, TAB2, (TAB5): Connector (Power supply) CN119: Connector
TAB3, TAB4: Connector (Reactor) CN22: Connector (Thermistor OA)
■ Attention
1. With this product, the wiring installation method will vary according to the design of the system.
2. Perform electrical installation to meet local electrical regulations.
3. Always use double insulated PVC cable for the transmission cables.
4. Wiring work must be performed by qualified professionals.
5. All supply circuits must be disconnected before obtaining access to the terminal devices.
6. Select proper circuit breaker according to the electrical current information in the chart below
Model LGH-F300RVX-E LGH-F470RVX-E LGH-F600RVX-E
Maximum current when operating [A] 2.05 3.10 3.45
Inrush current after pow-
er supply ON [A]
10 ms 6.1
100 ms 3.6

─ 9 ─
LGH-F1200RVX-E
12 V or
24 V DC
Mr. Slim
(Non-polar)
7
8
9
10
S
A
B
1
2
1
2
N
L
N
PE
L
M1
M2
CN7
CN118
CN119
CN10
CN9
TAB3,4
REACTOR
TAB5
TAB1
ISOLATOR
TH1 (OA)
TH2 (RA)
LINE
FILTER
SUPPLY
FAN MOTOR
EXHAUST
FAN MOTOR
TM1
CN19
CN18
CN22
CN5
SA2SA1
SW5
SW2
3
POWER
SUPPLY
TM2
TB5
TM4
TM3
M-NET
transmission cable
Shield Wire
2nd remote controller
(Max 2 controllers)
2nd Lossnay unit
(Max 15 units)
(*1) MAX 240 VA C 1 A MIN 208 V AC 100 mA
24 V DC 1 A 5 V DC 100 mA
PZ-
61DR-E
CN26 (WH)
CN32 (WH)
CN17(RE)
TAB2
M1
M2
CN7
CN10
CN9 TAB3, 4
REACTOR
TAB2
EXHAUST
FAN MOTOR
TAB1
CN121
CN21
Operation
monitor output (*1)
Malfunction
monitor output (*1)
COM
(Field supply)
SUPPLY
FAN MOTOR
Upper Printed
Circuit Board
LED1
LED2
LED4
LED3
X13
X14
X15
Volt-free
contact
GM
GM
Bypass monitor or
Pre-heater signal
output (*1)
Lower Printed
Circuit Board 2
LED6
Lower Printed
Circuit Board 1
LED6
CN20 (GR)
208-230 V ～ 60 Hz
SW7
CN105 (RE)
Upper Printed
Circuit Board
(Control circuit board)
(Power circuit board (upper))
(Power circuit board)
Definition of symbols
M1: Motor for exhaust fan X13: Relay contact CN20: Unused
M2: Motor for supply fan X14: Relay contact CN21: Connector
GM: Motor for By-pass damper X15: Relay contact CN121: Connector
TH1: Thermistor for outside air CN5: Connector (Thermistor RA) CN22: Connector (Thermistor OA)
TH2: Thermistor for return air CN7: Connector (Motor for By-pass damper) CN26: Connector (By-pass, 0-10 V DC Fan speed control)
SW2,5,7: Switch (Function selection) CN9: Connector (Fan motor) CN32: Connector (Remote control selection)
TM1: Terminal block (Power supply) CN10: Connector (Fan motor) CN105: Connector (IT communication)
TM2: Terminal block (External control input) CN17: Connector (Fan speed 1/2/3/4) SA1: Address setting rotary switch (10 digit)
TM3: Terminal block (Monitor output) CN18: Connector SA2: Address setting rotary switch (1 digit)
TM4: Terminal block (Transmission cable) CN118: Connector LED1 to LED3: Inspection indicator lamp
TB5: Terminal block (M-NET Transmission cable) CN19: Connector LED4, LED6: Power supply indicator lamp
TAB1, TAB2, (TAB5): Connector (Power supply) CN119: Connector SYMBOL : Terminal block
TAB3, TAB4: Connector (Reactor) : Connector on PCB
■ Attention
1. With this product, the wiring installation method will vary according to the design of the system.
2. Perform electrical installation to meet local electrical regulations.
3. Always use double insulated PVC cable for the transmission cables.
4. Wiring work must be performed by qualified professionals.
5. All supply circuits must be disconnected before obtaining access to the terminal devices.
6. Select proper circuit breaker according to the electrical current information in the chart below
Model LGH-F1200RVX-E
Maximum current when operating [A] 6.40
Inrush current after pow-
er supply ON [A]
10 ms 12.2
100 ms 7.2

─ 10 ─
1s digit10s digit
Fed with power: lit
Not fed with power: unlit
Remote controller
power supply indicator
(LED3 Green)
Bypass monitor output
Pre-heater output
(Between [7] and [10] )
During bypass mode or
when the pre-heater is operating: 0 Ω
During energy recovery mode or
when the pre-heater is stopped:
∞
Ω
Malfunction monitor output
(Between [8] and [10] )
Error: 0 Ω
Normal: ∞ Ω
Operation monitor output
(Between [9] and [10] )
When Lossnay is operating: 0 Ω
When Lossnay is stopped:
∞
Ω
Monitor output
COM
Remote controller
(PZ-61DR-E)
10 to 13 V DC
M-NET transmission
cable (Power supply
unit, etc.)
M-NET transmission
cable (Shielded)
External control input
Power circuit
board (upper)
5 V DC (Insulated)
Power for the circuit
Fed with power: lit
Not fed with power: unlit
Address setting
switch
Model selection
switch
Function selection
switch
Error indicator
(LED1 Green)
Normal: unlit
Error: blinking
During delay operation: lit
M-NET indicator
(LED2 Red)
Registered: unlit
Not registered: lit
M-NET communication error: blinking
Power supply indicator
for the circuit
(LED4 Red)
Outdoor air (OA)
thermistor
Return air (RA)
thermistor
Circuit board name Lot number indication
Indication of the
microcomputer
software No.
SA1 SA2 SW6
SW2
SW5
SW7
GND
(Insulated)
Power circuit board
12 to 14 V DC
(Insulated)
Only for LGH-F1200RVX-E
6. Circuit board diagrams
Circuit board diagrams and check points
(1)Control circuit board

─ 11 ─
(2) Power circuit board
Caution:
The power circuit board is not insulated from the power line (high voltage part), except for the connection part
(CN118, CN119, and CN121) with the control circuit board. Also, even when the power supply is cut off, the
capacitor is charged. Therefore, wait for at least five minutes before starting work.
GND
(Not insulated)
Control circuit
board
12 to 14 V DC
(Insulated)*
GND
(Insulated)*
14 to 16 V DC
(Not insulated) Reactor
Supply fan motor (CN10)
Pin No. of the connector
[1] Power for the motor: 260 to 330 V DC
[2] Not used
[3] GND
[4] Power for motor control: 14 to 16 V DC
[5] Speed command voltage: 0 to 6 V DC
[6] Rotational speed pulse
Fed with power: lit
Not fed with power: unlit
Power supply indicator
for motor control
(LED6 Red)
Only for LGH-F1200RVX-E
Control circuit
board*
Note:
The components marked with * are not placed on the power circuit board (upper) of LGH-F1200RVX-E.
Damper motor output
208 to 230 V/60 Hz
Power supply input
208 to 230 V/60 Hz
Fuse
10 A/250 V
Fuse
5 A/250 V
Lot number
indication
Exhaust fan motor (CN9)
Pin No. of the connector
[1] Power for the motor: 260 to 330 V DC
[2] Not used
[3] Not used
[4] GND
[5] Power for motor control: 14 to 16 V DC
[6] Speed command voltage: 0 to 6 V DC
[7] Rotational speed pulse

─ 12 ─
Applicable Device Applicable Model
Lossnay Energy Recovery Ventilator
LGH-F300RVX-E, LGH-F470RVX-E, LGH-F600RVX-E, LGH-F1200RVX-E
Lossnay Remote Controller PZ-61DR-E, PZ-43SMF-E
No. Preliminary check item Details
1 Product information • Model name of the product
• Serial number of the product, manufacturing lot number of the circuit board
• Microcomputer software version marked on the circuit board
2 Fault status • Fault status (For example, the fan does not operate.)
• Error code display on the remote controller
• Operation setting of the remote controller (ventilation mode setting, fan
speed setting, etc.)
3 Frequency of fault occur-
rence
• Frequency of fault occurrence (frequency of date and time of occurrence,
regularity of occurrence, etc.)
• Operating time up to fault occurrence
• Date of start of use, date of fault occurrence
4 Timing of fault occur-
rence
• Remote controller operation performed before fault occurrence
• Operating status, etc.
5 System settings • Function selection switch settings and address setting of the product
• Model name and address setting of the Lossnay remote controller or system
controller, etc.
• Function settings on PZ-61DR-E when it is used
6 System drawings • System Configuration
• Wiring
• Record of the Lossnay function setting statuses
7. Troubleshooting
Work precautions
• Before starting the service, the power supply isolator must be turned off. Pay sufficient attention to avoid
electric shock or injury.
• When removing or touching the cables, circuit boards or other parts, make sure to turn off the power supply isolator.
• Even after the power supply isolator is turned off, the capacitor on the circuit board retains high voltage for
a while. Therefore, before servicing, wait for at least five minutes, and then use a tester to check that the
voltage has dropped.
• Once the power supply is turned off, be sure to wait for at least five minutes before turning the power back on again.
• When servicing, power supply to M-NET must be turned off. Live-line working may cause a circuit board
failure.
• When servicing, recreate the malfunction two or three times before starting repairs.
• When servicing, always keep proper footing.
• 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.
• When removing the circuit board, always hold it at both ends and remove carefully in order not to apply
force to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• When circuit board is considered to be a cause, check closely for any broken section on the copper foil
patterns, burning or discoloration.
• After replacing the circuit board, make sure that the switch settings on the new board are the same as the
old board.
• Make sure to connect the power supply wires correctly.
• Avoid application of abnormal voltage.
• When carrying out wiring, power supply to M-NET must be turned off, otherwise it will cause a malfunction.
7-1 Service flowchart
After checking the check items below, follow the troubleshooting for servicing.

─ 13 ─
Lossnay does not work after installation is
completed.
Lossnay does not work in trial operation
after installation is completed, or Lossnay
stops working during use.
The remote controller does not work after
installation is completed.
Operations such as ON/OFF, fan speed or
ventilation mode switching are not possi-
ble on the remote controller after installa-
tion is completed.
• An error code is displayed on the remote
controller.
• LEDs on the circuit board blink or light.
7-2 Check details
(1) Failure mode 1: Lossnay does not work.
Initial Check Items
Check the following details if Lossnay does not work after installation is completed.
[1] Power supply
No. Check Item Corrective action
1 Is the main power supply on? Turn the main power supply on.
2 Is the current capacity of the power supply isolator
appropriate?
Use an appropriate power supply isolator.
3 Is the designated cable used for the power supply
cable?
Use the designated cable.
4 Is the specified power supply supplied to the power
supply terminal (TM1)?
208-230 V/60 Hz
Supply the designated power supply.
5 Is the power supply cable incorrectly wired, is there a
faulty connection or are screws loose?
Connect the cable securely and correctly, and
tighten the screws firmly.
6 Is there a faulty connection on the power supply termi-
nals (TM1, TAB1, TAB2, and TAB5)?
Connect the lead wires securely.
7 Is there a faulty connection on the reactor terminals
(TAB3 and TAB4)?
For LGH-F1200RVX-E, check both the power circuit
board and power circuit board (upper).
Connect the lead wires securely.
8 Are the power supply indicator lamps (LED4 and LED6,
red) lit?
For LGH-F1200RVX-E, check both the power circuit
board and power circuit board (upper).
Check the above items.
(1) Failure mode 1: Lossnay does not work.
(2) Failure mode 2: The remote controller does not
work.
(3) Failure mode 3: Operations on the remote con-
troller are not possible.
(4) Failure mode 4: Error code and LED display

─ 14 ─
No. Check Item Corrective action
1 Are the designated cables used for the remote control-
ler transmission cable and M-NET transmission cable?
(See Table 2-1 and Table 2-2.)
Use the designated transmission cables.
2 Are the designated cables used for the external input/
output signal cable? (See Table 2-3.)
Use the designated cables.
3 Are the transmission cables wired using multicore
cables?
Use the designated transmission cables.
4 Are multiple transmission cables wired in the same
piping duct?
Wire the transmission cable away from one
another.
5 Is the power supply cable wired at least 2 inch (5 cm)
away from transmission cables?
Wire the power supply cable at least 2 inch (5
cm) away from the transmission cables.
6 Are the transmission cables connected to the designat-
ed terminal block? (See Table 2-1 and Table 2-2.)
Connect the transmission cables to the desig-
nated terminal blocks.
7 Are the transmission cables incorrectly wired, is there a
faulty connection or are screws loose?
Connect the cable securely and correctly, and
tighten the screws firmly.
8 Is the wiring length of the transmission cable within the
regulations? (See Table 2-1 and Table 2-2.)
Wire the cables within the regulations.
9 Are communication cables wired at least 2 inch (5 cm)
away from the other communication cables?
Wire the cables at least 2 inch (5 cm) away
from the other cables.
10 Does the external input signal match the specifica-
tions? (See Table 2-3.)
Input the signal that matches the specifications.
11 Is the external input signal input to the Lossnay set as
the main Lossnay?
Input the signal to the Lossnay set as the main
Lossnay (SW5-10 ON).
12 Is the function selection for the external output signal
set correctly?
Set the function selection switches (SW2-8,
5-2, and 5-6) on the circuit board correctly.
Set the function settings (No. 57 and 58) of PZ-
61DR-E correctly.
Cable M-NET transmission cable
Type Shielded cable CVVS, CPEVS
Number of cores 2-core cable
Cable diameter AWG 16 to 14
(1.25 mm2to 2.0 mm2)
Max. extension 219 yd. (200 m) (Note 1)
Total extension 547 yd. (500 m) (Note 2)
Terminal block TB5 [A] [B]
(Note 1) Distance from the power supply unit to
the furthest unit or system controller.
(Note 2) Overall length of the cable between the
units and the system controllers.
Cable PZ-61DR-E or PZ-43SMF-E
transmission cable
Type Sheathed cable
Number of cores 2-core cable
Cable diameter AWG 22 (0.3 mm2)
Total extension 219 yd. (200 m)
Terminal block TM4 [1] [2]
[2] Transmission cables
(Remote controller transmission cable, M-NET transmission cable, external input/output signal cable)
Table 2-1
M-NET transmission cable specifications
Table 2-2
Remote controller transmission cable specifications

─ 15 ─
Function name
Terminal or
connector
on the circuit
board
Signal
specifications Materials used Total extension
External control input
(volt-free contact) TM2 [1] [3] Level/pulse (Note 1)
Single-lead 1/32 in. (0.8 mm) to
3/64 in. (1.2 mm) dia. or twisted
lead AWG 20 (0.5 mm2) to AWG
15 (1.5 mm2)
547 yd.
(500 m)
External control input
(12 V DC, 24 V DC) TM2 [1] [2] Level/pulse (Note 1)
Single-lead 1/32 in. (0.8 mm) to
3/64 in. (1.2 mm) dia. or twisted
lead AWG 20 (0.5 mm2) to AWG
15 (1.5 mm2)
(Note 2)
Mr. Slim indoor unit control signal TM2 [1] [2] Serial signal Slim-Lossnay connection cable
(Accessory parts)
547 yd.
(500 m)
Remote/local switching CN32 [1] [3] Level
(Note 1)
Remote ON/OFF adaptor
(PAC-SE55RA-E, PAC-715AD)
11 yd.
(10 m)
Remote ON/OFF input CN32 [1] [2]
Fan speed 4 input (volt-free contact) CN17 [1] [2]
Level
(Note 1) Remote display adaptor
(PAC-SA88HA-E, PAC-725AD)
Fan speed 3 input (volt-free contact) CN17 [1] [3]
Fan speed 2 input (volt-free contact) CN17 [1] [4]
Fan speed 1 input (volt-free contact) CN17 [1] [5]
Bypass mode input
(volt-free contact) CN26 [1] [2]
Fan speed switching input
(0 to 10 V DC) CN26 [4] [5] Analog
<Caution>
• Input the signals to the Lossnay (SW5-10 ON, with the smallest address setting) set as the main Lossnay in
the group.
(Note 1) The input signal must conform to the following specifications:
Level signal Volt-free contact, 12 V DC, 24 V DC, the duration of ON and OFF should be 10-second
or more.
Pulse signal Volt-free contact, 12 V DC, 24 V DC, the duration of ON should be 200 msec. or more,
and minimum 10-second absence is necessary to the next pulse .
In the case of relay contact input, use a relay having a contact rating of 15 V DC/0.1 A or higher and a
minimum applicable load of 1 mA or less.
(Note 2) Check the specifications of the external device.
Table 2-3 External input/output specifications

─ 16 ─
No. Check Item Corrective action
1 Is the main Lossnay set correctly? Check the function selection switch (SW5-10) on
the circuit board.
When an external signal is input to multiple
Lossnay units, set one of the units in the group as
the main Lossnay (SW5-10 ON).
2 Are the function selection switches on the circuit
board set correctly to suit the required application?
Set the function selection switches (SW2, SW5,
and SW7) on the circuit board correctly.
3 Is the applicable model used as the Lossnay re-
mote controller?
Use PZ-61DR-E or PZ-43SMF-E.
(The air conditioner remote controller including MA
controller cannot be used.)
4 When PZ-61DR-E is used, are the function selec-
tions set correctly to suit the required application?
Set the function selections correctly.
5 Was a function set with the function selection
switches on the circuit board after the function is
set with PZ-61DR-E?
Set the function again with PZ-61DR-E.
For the function that can be set with both PZ-
61DR-E and the function selection switches, if the
function is set to other than "DIP-SW priority" with
PZ-61DR-E, setting with the function selection
switches is disabled.
6 Is the Lossnay address set correctly? Set the address setting switches (SA1 and SA2)
correctly.
[4] Function setting (See the Lossnay technical manual for details.)
Terminal block TM3 [9] [10] TM3 [8] [10] TM3 [7] [10]
Function Name Operation monitor Malfunction monitor Bypass monitor or
Pre-heater
Signal specifications Volt-free contact
Output rating 240 V AC, 1 A
24 V DC, 1 A
Min. applicable load 208 V AC, 100 mA
5 V DC, 100 mA
Table 3-1 Monitor Output Specifications
No. Check Item Corrective action
1 Is the signal cable wired by multicore cable? Wire the cable using a 2-core cable.
2 Are the signal cables and transmission cables
wired in the same piping duct?
Wire the signal cables away from the transmission
cables.
3 Is the power supply cable wired at least 2 inch
(5 cm) away from signal cables?
Wire the power supply cable at least 2 inch (5 cm)
away from the signal cables.
4 Is the signal cable connected to the designated
terminal block? (See Table 3-1.)
Connect the signal cable to the designated terminal
block.
5 Is the signal cable incorrectly wired, is there a faulty
connection or are screws loose?
Connect the cable securely and correctly, and tight-
en the screws firmly.
6 Is the output capacity of the signal cable within
rating? (See Table 3-1.)
Use the signal cable within rating.
7 Is the function selection for the external output
signal set correctly?
Set the function selection switches (SW2-8, 5-2,
and 5-6) on the circuit board correctly.
Set the function settings (No. 57 and 58) of PZ-
61DR-E correctly.
(See the Lossnay technical manual.)
[3] Monitor output signal cable

─ 17 ─
No. Problem Factor Corrective action
1 The fan does not
operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
The connectors between the
fan motor and circuit board is
disconnected.
Check the connector (CN9) for the exhaust fan motor
and the connector (CN10) for the supply fan motor.
The connector between the
control circuit board and
power circuit board is dis-
connected.
Check the connector connections (CN18-CN118 and
CN19-CN119).
Check the connector connection (CN21-CN121).
(For LGH-F1200RVX-E only)
The model selection switch
(SW6) is not set correctly.
Make the SW6 setting appropriate for the model.
(See chapter 8. (8) Setting status record (page 48).)
The temperature around the
product is high.
Use the product at a temperature of 104°F (40°C) or
lower.
Fan motor failure Check the resistance between the motor leads.
(See (6) Motor resistance table (page 36).)
If the measured value is significantly different from
the values specified in the table, replace the fan
motor.
Circuit board failure Disconnect the connectors (CN9 and CN10), and
check the output voltage of each pin of the connec-
tors within one minute after turning the switch (SW2-
1) ON. (One minute later, the error will occur.)
(See chapter 6. (2) Power circuit board (page 11).)
If the voltage value is abnormal, replace the circuit
board.
If the problem persists, replace the fan motor.
Individual function check items
[6] If Lossnay does not work in the trial operation after installation is completed, or if Lossnay stops working
during use, check the following items.
No. LED Contents Check Item Corrective action
1 LED1
(Green)
Lossnay main
unit error indi-
cator
Blinking: Starting up, error occurred See Failure Mode 4.
Lit: During delay operation Lossnay operates after the delay time
has passed.
Unlit: Other than above It is normal.
2 LED2
(Red)
M-NET System
error indicator
Blinking: Error occurred See Failure Mode 4.
Lit: No M-NET connection informa-
tion
When using M-NET, perform group reg-
istration with the system controller.
Unlit: Other than above It is normal.
3 LED3
(Green)
Remote control-
ler power supply
indicator
Lit: Power supplied to the remote
controller (Main Lossnay)
The LED goes out when power is sup-
plied to the remote controller from other
Lossnay units in a multiple Lossnay
group.
Unlit: Power not supplied to the
remote controller (Sub Lossnay)
4 LED4
(Red)
Power supply
indicator (control
circuit board)
Check that this LED is lit The LED lights while power is being
supplied to the control circuit board.
5 LED6
(Red)
Power supply
indicator (power
circuit board)
Check that this LED is lit The LED lights while power is being
supplied to the power circuit board.
(Do not touch components on the circuit
board when the LED is lit.)
[5] LED Indications on the circuit board

─ 18 ─
No. Problem Factor Corrective action
2 Though the remote
controller display
indicates the fan
is running, the fan
stops by itself.
The Lossnay unit is operat-
ing in the protective mode
(intermittent operation).
When PZ-61DR-E is used, it displays the icon " "
that indicates the protective operation is in-progress.
For details, see the Lossnay technical manual or
remote controller manual.
The Lossnay unit is set to
the delay operation.
When PZ-61DR-E is used, it displays the icon " "
that indicates the delay operation is in-progress.
LED1 (green) on the control circuit board lights.
Lossnay operates in 30 minutes (or 15 minutes) after
the air conditioner is operated to run.
Check the function selection switch (SW5-1) on the
circuit board or the function setting (No. 9) of PZ-
61DR-E. (See the Lossnay technical manual.)
The interlocked air condi-
tioner (Mr. Slim indoor unit
or City Multi indoor unit) is
defrosting.
The supply fan has been stopped to prevent cold air
from blowing out. When the air conditioner finishes
defrosting, the fan operation is started automatically.
The system is switching the
ventilation mode.
When switching the ventilation mode (Energy recov-
ery mode/Bypass mode), the fan stops (for approx.
30 seconds).
The temperature around the
product is high.
When the ambient temperature of the product is high
(higher than 104°F (40°C)), the fan may stop to pre-
vent the fan motor from overheating.
3 The fan does not
stop even though
the remote control-
ler is operated to
stop operation.
The pre-heater or operation
monitor with delay operation
is set to be used.
If the pre-heater or operation monitor with delay op-
eration is set to be used, the fan continues operating
for three minutes after the stop operation. Check the
function selection switches (SW2-8 and 5-6) on the
circuit board or the function settings (No. 57 and 58)
of PZ-61DR-E. (See the Lossnay technical manual.)
4 Even though the
remote controller is
operated to change
the fan speed, the
fan speed does not
change.
The indoor negative pres-
sure setting or the indoor
positive pressure setting is
set.
Check the function selection switches (SW2-4 and
2-5) on the circuit board or the function settings (No.
6 and 7) of PZ-61DR-E.
(See the Lossnay technical manual.)
The external fan speed input
is set. (CN17)
When PZ-61DR-E is used, it displays the icon " ".
Check the fan speed switching input (CN17).
The external fan speed input
is set. (CN26)
When PZ-61DR-E is used, it displays the icon " ".
Check the function selection switches (SW2-3 and
2-6) on the circuit board or the function setting (No.
63) of PZ-61DR-E.
(See the Lossnay technical manual.)
The system is operating in
the protective mode (inter-
mittent operation).
When PZ-61DR-E is used, it displays the icon " "
that indicates the protective operation is in-progress.
For details, see the Lossnay technical manual or
remote controller manual.
The pre-heater is ON. When the pre-heater is ON, Lossnay runs at Fan
speed 2 or higher speed. Even when Fan speed 1
is selected with the remote controller or external fan
speed input, Lossnay runs at Fan speed 2.
5 The fan operation is
unstable.
The motor rotation speed is
under control.
This product controls the motor by detecting the mo-
tor rotation speed. The fan operation may be unsta-
ble during rotation speed control (for maximum about
10 minutes).
6 Air volume is abnor-
mally large or small.
The model selection switch
(SW6) is not set correctly
after the circuit board is
replaced.
Make the SW6 setting appropriate for the model.
(See chapter 8. (8) Setting status record (page 48).)

─ 19 ─
No. Problem Factor Corrective action
7 The damper does
not operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
The connector between the
damper motor and circuit
board is disconnected.
Check the connection of the connector (CN7) on the
power circuit board.
Mechanical failure Remove the rod of the damper board and check if the
damper board can be moved by hand.
Damper motor failure Remove the rod of the damper board and turn the
trial operation switch (SW2-1) ON.
The damper motor operates in about 30 seconds.
If the damper motor does not operate, replace the
damper motor (GM assembly).
Circuit board failure Disconnect the connector (CN7) from the power cir-
cuit board and check the voltage value between the
pins of CN7 when the trial operation switch (SW2-1)
is turned ON.
(Voltage is output in about 30 seconds after switch
ON.)
If there is no voltage value, replace the circuit board.
If the problem persists, replace the damper motor
(GM assembly).
8 Abnormal noise
comes from the
damper motor
Mis-assembling of the damp-
er motor
Remove the GM assembly from the main unit, and
then remove the damper motor from the damper mo-
tor casing to check the pulley position. If the position
is incorrect, adjust it as shown in the picture below,
and then reassemble the GM assembly.
PulleyDamper motor
Damper motor failure If no error is found around the pulley and wire, re-
place the GM assembly.
9 Even though the
remote controller is
operated to change
the ventilation
mode, the venti-
lation mode is not
changed.
The outdoor temperature is
46.4°F (8°C) or lower.
When the outdoor temperature is 46.4°F (8°C) or
lower, the ventilation mode is fixed to the Energy
recovery mode.
The signal is input to the
Bypass mode switching input
(CN26 [1] [2]).
Check the Bypass mode switching input (CN26 [1] [2]) .
(See the Lossnay technical manual.)
The Lossnay unit is perform-
ing the Night-purge opera-
tion.
When PZ-61DR-E is used, The ventilation mode
cannot be changed during the Night-purge operation.
(See the Lossnay technical manual.)
The pre-heater is ON, or
within one hour after the
pre-heater is turned OFF.
When the pre-heater is ON, or for one hour after the
pre-heater is turned OFF, the ventilation mode is
fixed to the Energy recovery mode.

─ 20 ─
No. Problem Factor Corrective action
10 The ventilation
mode cannot be
switched when
Lossnay is operat-
ing in the automatic
mode.
Temperature condition for
Energy recovery mode or
Bypass mode is not satisfied.
Check the temperature map.
For details, see the Lossnay technical manual.
It has not passed 30 minutes
since the ventilation mode is
switched.
Switching of the ventilation mode is controlled in 30
minutes cycle.
The outdoor temperature is
46.4°F (8°C) or lower.
When the outdoor temperature is 46.4°F (8°C) or
lower, the ventilation mode is fixed to the Energy
recovery mode.
The signal is input to the
Bypass mode switching input
(CN26 [1] [2]).
Check the Bypass mode switching input (CN26 [1] [2]).
(See the Lossnay technical manual.)
The operation mode of the
interlocked air conditioner
(Mr. Slim indoor unit or City
Multi indoor unit) is set to fan
operation or heating.
If the operation mode of the interlocked air condition-
er is fan operation or heating, the ventilation mode of
Lossnay is fixed to the Energy recovery mode.
The pre-heater is ON, or
within one hour after the
pre-heater is turned OFF.
When the pre-heater is ON, or for one hour after the
pre-heater is turned OFF, the ventilation mode is
fixed to the Energy recovery mode.
11 Air volume is too
small.
Is the air filter clogged? Clean the air filter.
Pressure loss in the duct is
too high.
Set the supply/exhaust fan power up setting.
(See the Lossnay technical manual.)
The model selection switch
(SW6) is not set correctly
after the circuit board is
replaced.
Make the SW6 setting appropriate for the model.
(See chapter 8. (8) Setting status record (page 48).)
The indoor negative pres-
sure setting or the indoor
positive pressure setting is
set.
Check the function selection switches (SW2-4 and
2-5) on the circuit board or the function settings (No.
6 and 7) of PZ-61DR-E.
(See the Lossnay technical manual.)
Power supply voltage is low. Check the power supply voltage.
In interlock with the air condi-
tioner, the outdoor air intake
port of the Lossnay unit is
connected with the air condi-
tioner by using a duct.
In this case, even if the Lossnay remote controller is
operated to start Lossnay while the air conditioner is
stopped, Lossnay will not supply air.
Are the Filterboxes used? To use the Filterboxes, set the function of Fan power
up individually for RA (return air) and OA (outdoor air
intake) sides.
Check the function selection switches (SW7-4 and
7-5) on the circuit board of the Lossnay unit or the
function settings (No. 64 and 65) of PZ-61DR-E.
Are the filters in the
Filterboxes clogged?
Clean or replace the filters in the Filterboxes.