Mitsubishi Electric LGH-F300RVX2-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-F300RVX2-E
LGH-F380RVX2-E
LGH-F470RVX2-E
LGH-F600RVX2-E
LGH-F940RVX2-E
LGH-F1200RVX2-E
February 2022 No. U307-A
Remote controller (Optional)
PZ-62DR-EA
PZ-43SMF-E
Filter (For replacement)
PZ-50RF9-E
PZ-65RF9-E
PZ-80RF9-E
PZ-100RF9-E
Nameplate
Nameplate

Contents
─ 2 ─
Contents
1. Safety precautions .......................................................................... 3
2. Changed points............................................................................... 4
3. Specifications.................................................................................. 4
4. Outside dimensions ........................................................................ 6
5. Electrical wiring diagrams ............................................................... 9
6. Circuit board diagrams...................................................................11
7. Troubleshooting ............................................................................ 13
7-1 Service flowchart ....................................................................................13
7-2 Check Details .........................................................................................14
8. Overhauling procedures................................................................ 40
9. Parts catalog ................................................................................. 54
LGH-F300RVX2-E ........................................................................................55
LGH-F380RVX2-E ........................................................................................63
LGH-F470RVX2-E ........................................................................................71
LGH-F600RVX2-E ........................................................................................79
LGH-F940RVX2-E ........................................................................................87
LGH-F1200RVX2-E ......................................................................................95
3
4
4-5
6-8
9-10
11-12
13-39
13-14
14-39
40-53
54-102
55-62
63-70
71-78
79-86
87-94
95-102

─ 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
insulation 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
Qualified electricians shall conduct electric work in
accordance with your local electric work regulations
and the installation manuals.
( 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 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-F300RVX2-E LGH-F300RVX-E • Filter grade was changed from MERV4 to MERV7.
• New control circuit board
LGH-F380RVX2-E –
LGH-F470RVX2-E LGH-F470RVX-E
LGH-F600RVX2-E LGH-F600RVX-E
LGH-F940RVX2-E –
LGH-F1200RVX2-E LGH-F1200RVX-E
PZ-62DR-EA PZ-61DR-E
3. Specifications
Model name LGH-F300RVX2-E, LGH-F380RVX2-E, LGH-F470RVX2-E, LGH-F600RVX2-E,
LGH-F940RVX2-E, LGH-F1200RVX2-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 (MERV7)
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 10 min OFF, 60 min ON
5°F (-15°C) or less: Sensing 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 ─
Model name
Input
power
(W)
Air volume
Specific
Fan
power
Static
pressure Exchange efficiency (%)
Noise
(dB)
Dia. of the
centrifugal
fan
(Inch (mm))
Weight
(CFM) (CMH)
(W/CFM) (InH2O) (Pa) Tempe-
rature
Enthalpy
(lbs) (kg)
Heating Cooling
LGH-F300RVX2-E 235 300 510 0.78 1.00 250 65.5 63.0 50.0 37.0 8 3/4 (220) 75 34
LGH-F380RVX2-E 340 380 646 0.89 0.86 215 65.0 61.0 49.0 38.0 9 5/8 (245) 90 41
LGH-F470RVX2-E 425 470 799 0.91 1.00 250 69.0 64.0 51.0 40.0 9 5/8 (245) 110 50
LGH-F600RVX2-E 515 600 1019 0.86 0.86 215 67.0 64.0 50.0 41.0 9 5/8 (245) 123 56
LGH-F940RVX2-E 850 940 1597 0.91 1.00 250 69.0 64.0 51.0 43.0 9 5/8 (245) 225 102
LGH-F1200RVX2-E 1030 1200 2039 0.86 0.86 215 67.0 64.0 50.0 43.0 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) immedi-
ately 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 ISO 16494:2014, therefore characteristic values are mea-
sured by chamber method.
* On-site commissioning measurements by pitot tube method could be as much 20% different from ISO test room
conditions. If the measuring point is close to sources of turbulence like bends, contractions and dampers, etc., it is
difficult to measure air volume correctly. A straight duct length more than 10 D (D=duct diameter) 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 procedures for buildings AG3/89.3
(2001)).
Remote controller
Model name PZ-62DR-EA PZ-43SMF-E
Power supply requirement 12 V DC (Supplied from Lossnay unit)
Power consumption 0.3 W
Transmission cable Non polarized 2-core cable (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)
Size 4 22/32 x 4 22/32 x 3/4 inch
(120 x 120 x 19 mm)
4 22/32 x 2 3/4 x 19/32 inch
(120 x 70 x 15 mm)
Weight 9/16 lbs (0.25 kg) 7/32 lbs (0.10 kg)

─ 6 ─
4. Outside dimensions
LGH-F300RVX2-E, LGH-F380RVX2-E, LGH-F470RVX2-E, LGH-F600RVX2-E
N
3 1/8 (79)3 1/8 (79) A
F
C
F
J K
B
E
D
L
13/16 (20)
L
φG φH
M
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
(4-1/2 X 13/16 (4-13 X 20) oval)
Power supply
cable opening
5 7/8 to 9 7/8 (150 to 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
LGH-F300RVX2-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)
29 3/8
(745)
5 5/16
(135.5)
4 7/8
(124)
1 3/16
(30)
75
(34)
LGH-F380RVX2-E
35 3/4
(908)
37 9/16
(954)
15 29/32
(404)
35 15/64
(895)
39 13/32
(1001)
2 3/4
(70)
7 7/8
(200)
7 9/16
(192)
8 3/16
(208)
27 1/4
(692)
5 5/32
(131)
4 7/8
(124) 090 (41)
LGH-F470RVX2-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)
27 3/16
(690)
6 3/16
(157)
6 1/2
(165)
1 37/64
(40)
110
(50)
LGH-F600RVX2-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)
36 1/8
(917)
6 3/16
(157)
6 1/2
(165)
1 37/64
(40)
123
(56)
Unit: Inch (mm)

─ 7 ─
LGH-F940RVX2-E, LGH-F1200RVX2-E
39 3/4 (1010)
C
B
D
A
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 to 9 7/8 (150 to 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 17/32 (115)
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
Model A B C D Weight
lbs (kg)
LGH-F940RVX2-E 39 1/2
(1004)
27 3/16
(690)
27 3/16
(690)
41 9/64
(1045)
225
(102)
LGH-F1200RVX2-E 48 1/2
(1231)
36 1/8
(917)
36 1/8
(917)
50 1/8
(1272)
251
(114)
Unit: Inch (mm)

─ 8 ─
PZ-62DR-EA 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-50RF9-E, PZ-65RF9-E, PZ-80RF9-E, PZ-100RF9-E
Model Dimension The number of
filters per set Applicable model
A B C Supply Exhaust
PZ-50RF9-E 18 1/2
(470)
7 13/64
(183)
25/32
(20) 2 2 LGH-F300RVX2-E
PZ-65RF9-E 17 3/64
(433)
8 37/64
(218)
25/32
(20) 2 2 LGH-F380RVX2-E
PZ-80RF9-E 17 3/4
(451)
9 9/16
(243)
25/32
(20)
2 2 LGH-F470RVX2-E
4 4 LGH-F940RVX2-E
PZ-100RF9-E 22 1/4
(565)
9 9/16
(243)
25/32
(20)
2 2 LGH-F600RVX2-E
4 4 LGH-F1200RVX2-E
Notes:
• Each Lossnay unit is provided with one set of the filters. (Two sets for LGH-F940RVX2-E
and LGH-F1200RVX2-E)
Unit: Inch (mm)

─ 9 ─
5. Electrical wiring diagrams
LGH-F300RVX2-E, LGH-F380RVX2-E, LGH-F470RVX2-E, LGH-F600RVX2-E
* Wiring for TM1, TM2, TM3, TM4, and TB5 shown in dotted lines are field work.
* Be sure to connect the earth wire.
* An all pole electric leakage isolator must be installed.
* Always use an isolator for the main power connection.
9
10
S
A
B
1
2
1
2
NL
NL
CN12
CN119
CN114
CN10
CN9
LED6
TAB1 TAB2
TM1
Power supply terminal
SW5
SW6
SW2
TM2
TB5
TM4
TM3
PZ-62DR-EA
LED3
LED2
LED1
Y
Z
Supply fan motor
Exhaust fan motor
Monitor output
12 V or 24 V DC
Mr. Slim (non-polar)
Volt-free contact
M-NET transmission cable
2nd remote controller
(Max. 2 controllers)
2nd Lossnay unit
(Max. 15 units)
Isolator (Field supply)
POWER SUPPLY
208–230 V/60 Hz
LINE FILTER
Shielded Wire
X11
Power circuit boardControl circuit board
CN113
REACTOR
M
1
M
2
GM
LED4
CN19
CN14
CN35 CN5 CN7CN34
SW12 SW11
LINE FILTER
Lossnay unit
LED5
CN23
LINE FILTER
(For LGH-F300RVX2-E,
LGH-F380RVX2-E)
TH1
(OA)
TH2
(RA)
CN32
CN105
CN50 CN26 CN17
Definition of symbols
M1: Motor for exhaust fan
M2: Motor for supply fan
GM: Motor for Bypass damper
TH1: Thermistor for outdoor air
TH2: Thermistor for return air
SW2, 5: Switch (Function selection)
SW6: Switch (Model selection)
TM1: Terminal block (Power supply)
TM2: Terminal block (External control input)
TM3: Terminal block (Monitor output)
TM4:
Terminal block (Remote controller transmission cable)
TB5: Terminal block (M-NET transmission cable)
TAB1, TAB2: Connector (Power supply)
X11: Relay contact
CN5: Connector (Thermistor RA)
CN7: Connector (Thermistor OA)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN12: Connector (Damper motor)
CN17: Connector (Fan speed 1/2/3/4)
CN14: Connector
CN113: Connector
CN114: Connector
CN19: Connector
CN119: Connector
CN23: Connector (CO2sensor power supply)
CN26: Connector (Bypass switching/CO2sensor input)
CN32: Connector (Remote control selection)
CN34: Connector (CO2sensor output)
CN35: Connector (CO2sensor input)
CN50: Connector (Optional components: External
monitor output)
CN105: Connector (For IT communication)
SW11: Address setting rotary switch (ones digit)
SW12: Address setting rotary switch (tens digit)
LED1: Inspection indicator lamp
LED2: M-NET indicator lamp
LED3:
Remote controller power supply indicator lamp
LED4, LED6: Power supply indicator lamp
LED5: CO2sensor power supply indicator lamp
(When the CO2sensor is connected)
SYMBOL : Terminal block, : Connector on PCB
Select proper isolator according to the electrical current information in the chart below.
Model LGH-F300RVX2-E LGH-F380RVX2-E LGH-F470RVX2-E LGH-F600RVX2-E
Maximum current when operating [A] 3.40 3.10 4.05 4.15
Inrush current after power
supply ON [A]
10 ms 6.1
100 ms 3.6

─ 10 ─
LGH-F940RVX2-E, LGH-F1200RVX2-E
* Wiring for TM1, TM2, TM3, TM4, and TB5 shown in dotted lines are field work.
* Be sure to connect the earth wire.
* An all pole electric leakage isolator must be installed.
* Always use an isolator for the main power connection.
9
10
S
A
B
1
2
1
2
NL
NL
TM1
Power supply terminal
SW5
SW6
SW2
TM2
TB5
TM4
TM3
PZ-62DR-EA
LED3
LED2
LED1
Y
Z
Monitor output
12 V or 24 V DC
Mr. Slim (non-polar)
Volt-free contact
M-NET transmission cable
2nd remote controller
(Max. 2 controllers)
2nd Lossnay unit
(Max. 15 units)
Isolator (Field supply)
POWER SUPPLY
208–230 V/60 Hz
LINE FILTER
Shielded Wire
X11
Control circuit board
LED4
CN21
CN14
CN13
CN35 CN5 CN7CN34
SW12 SW11
LINE FILTER
Lossnay unit
LED5
CN23
CN12
CN119
CN114
CN10
CN9
LED6
TAB1 TAB2
Supply fan
motor
Exhaust fan
motor
Supply fan
motor
Exhaust fan
motor
Power circuit board
(Lower unit)
CN113
REACTOR
M
1
M2
GM
CN19
CN12
CN121
CN10
CN9
LED6
TAB1 TAB2
Power circuit board
(Upper unit)
CN113
REACTOR
M
1
M2
GM
TH1
(OA)
TH2
(RA)
CN32
CN105
CN50 CN26 CN17
Definition of symbols
M1: Motor for exhaust fan
M2: Motor for supply fan
GM: Motor for Bypass damper
TH1: Thermistor for outdoor air
TH2: Thermistor for return air
SW2, 5: Switch (Function selection)
SW6: Switch (Model selection)
TM1: Terminal block (Power supply)
TM2: Terminal block (External control input)
TM3: Terminal block (Monitor output)
TM4:
Terminal block (Remote controller transmission cable)
TB5: Terminal block (M-NET transmission cable)
TAB1, TAB2: Connector (Power supply)
X11: Relay contact
CN5: Connector (Thermistor RA)
CN7: Connector (Thermistor OA)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN12: Connector (Damper motor)
CN17: Connector (Fan speed 1/2/3/4)
CN13: Connector
CN14: Connector
CN113: Connector
CN114: Connector
CN19: Connector
CN119: Connector
CN21: Connector
CN121: Connector
CN23: Connector (CO2sensor power supply)
CN26: Connector (Bypass switching/CO2sensor input)
CN32: Connector (Remote control selection)
CN34: Connector (CO2sensor output)
CN35: Connector (CO2sensor input)
CN50: Connector (Optional components: External
monitor output)
CN105: Connector (For IT communication)
SW11: Address setting rotary switch (ones digit)
SW12: Address setting rotary switch (tens digit)
LED1: Inspection indicator lamp
LED2: M-NET indicator lamp
LED3:
Remote controller power supply indicator lamp
LED4, LED6: Power supply indicator lamp
LED5: CO2sensor power supply indicator lamp
(When the CO2sensor is connected)
SYMBOL : Terminal block, : Connector on PCB
Select proper isolator according to the electrical current information in the chart below.
Model LGH-F940RVX2-E LGH-F1200RVX2-E
Maximum current when operating [A] 8.10 8.30
Inrush current after power
supply ON [A]
10 ms 12.2
100 ms 7.2

─ 11 ─
6. Circuit board diagrams
Circuit board diagrams and check points
(1) Control circuit board
Caution:
Before servicing (including replacing the circuit boards), be sure to turn off the power supply isolator
and check that all the LEDs on the control circuit board and power circuit board are not lit. A large-
capacity electrolytic capacitor on the circuit board may carry voltage for several minutes after the iso-
lator is turned off.
TM2
External control input
Voltage-applied signal
Volt-free contact signal
1 2
Y Z
Lot number indication
Fed with power: lit
Not fed with power: unlit
Remote controller
power supply indicator
(LED3 Green)
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
Fed with power: lit
Not fed with power: unlit
Power supply indicator
for the circuit board
(LED4 Red)
Function selection switch
SW2
SW5
Address setting switch
(tens digit)
Address setting switch
(ones digit)
SW12
SW11
Model selection switch
SW6
Indication of the microcomputer
software No.
GND
(Insulated)
13 V DC
(Insulated)
CN19, CN14
Power circuit board
connection
Power for the circuit
Power for the circuit
TM4
Remote controller
transmission cable
11 to 14 V DC
TM3
Monitor output
Circuit board name
CN32
Remote/Local switching input
CN12: For rewriting the
microcomputer software
CN38: For rewriting the
microcomputer software
CN50: For optional components
External monitor output device
CN26: For optional components
CO2sensor signal input
0–10 V DC signal input
External bypass switching input
Output ON: 0 Ω
Output OFF:
∞
Ω
TB5
M-NET transmission cable
A B
S
M-NET transmission cable
24 to 30 V DC
(When using M-NET)
Shielded wire
CN34: For optional components
CO2sensor display output
CN35: For optional components
CO2sensor error input
CN7
Outdoor air (OA) thermistor
CN5
Return air (RA) thermistor
CO2sensor
power supply indicator
(LED5 Green)
CN17
External control input
Fan speed switching
CN105: For optional components
IT communication transmission cable
CN23: For optional components
CO2sensor power supply output
CN13, CN21
Power circuit board
connection [2]
(*Note 1)
*Note 1:
The connection is available only for the following models.
LGH-F940RVX2-E, LGH-F1200RVX2-E

─ 12 ─
(2) Power circuit board
There are three types of the power circuit board. The type of the power circuit board varies depending on the
model of the Lossnay unit.
When replacing the circuit board, use the applicable circuit board according to the table below.
Caution:
The power circuit consists of live parts. The power circuit board is not insulated from the power line,
except for the connection part with the control circuit board. Before servicing (including replacing
the circuit boards), be sure to turn off the power supply isolator and check that all the LEDs on the
control circuit board and power circuit board are not lit. A large-capacity electrolytic capacitor on the
circuit board may carry voltage for several minutes after the isolator is turned off.
CN10
Supply fan motor
Pin No. of the connector
[1] Power for the motor: 325 V DC
[3] GND
[4] Power for motor control: 15 V DC
[5] Speed command voltage: 0 to 6 V DC
[6] Rotational speed pulse
CN9
Exhaust fan motor
Pin No. of the connector
[1] Power for the motor: 325 V DC
[4] GND
[5] Power for motor control: 15 V DC
[6] Speed command voltage: 0 to 6 V DC
[7] Rotational speed pulse
Fed with power: lit
Not fed with power: unlit
Power supply indicator
for motor control
(LED6 Red)
CN114, CN119, CN113
Control circuit board
connection
CN12
Damper motor output
208 to 230 V/60 Hz
TAB1, TAB2
Power supply input
208 to 230 V/60 Hz
Fuse1
10 A/250 V
Lot number indication
13 V DC
(Insulated)
Power for the circuit
GND
(Insulated)
Power for the circuit
Circuit board name
CN121
Control circuit board
connection [2] (*Note 1)
TAB1 is connected to the
power supply via the reactor.
*Note 1:
The connection is available only for the following models.
LGH-F940RVX2-E, LGH-F1200RVX2-E
Power circuit board Lossnay unit
LG-X08DC-P4 LGH-F300RVX2-E, LGH-F380RVX2-E
LG-X08DC-P6 LGH-F470RVX2-E, LGH-F600RVX2-E
LG-X08DC-P5
LG-X08DC-P6
LGH-F940RVX2-E, LGH-F1200RVX2-E
(Equipped with two types of the power circuit board)

─ 13 ─
Applicable Device Applicable Model
Lossnay Heat recovery Ventilator LGH-F300RVX2-E, LGH-F380RVX2-E, LGH-F470RVX2-E,
LGH-F600RVX2-E, LGH-F940RVX2-E, LGH-F1200RVX2-E
Lossnay Remote Controller PZ-62DR-EA, 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
occurrence
• 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 occurrence • 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-62DR-EA when PZ-62DR-EA 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 elec-
tric shock or injury.
•
When removing or touching the cables, circuit boards or other parts, be 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 failure is considered to be a cause, check closely for any broken section on the copper foil
patterns, burning or discoloration of parts.
•
If the circuit board is replaced, make sure that the switch settings on the new board are the same as the old board.
• Be sure to connect the power supply wires correctly.
• 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.

─ 14 ─
Lossnay does not start properly.
Lossnay does not work in trial operation,
or Lossnay stops working during use.
The remote controller does not work.
Operations such as ON/OFF, fan speed
or ventilation mode switching are not pos-
sible on the remote controller.
• 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.
[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 specified 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, and TAB2)?
Connect the lead wires securely.
7 Is there a faulty connection to the reactor? Connect the lead wires securely.
8 Are the power supply indicator lamps (LED4 on the con-
trol circuit board and LED6 on the power circuit board,
red) lit?
The LED lights while power is supplied.
If not lit, 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

─ 15 ─
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 pip-
ing duct?
Wire the transmission cable away from one
another.
5 Is the power supply cable wired at least 2 in. (5 cm)
away from transmission cables?
Wire the power supply cable at least 2 in. (5 cm)
away from the transmission cables.
6 Are the transmission cables connected to the desig-
nated 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 in. (5 cm)
away from the other communication cables?
Wire the cables at least 2 in. (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 (with address number 1 or the smallest
number other than 0).
Cable M-NET transmission cable
Type Shielded cable CVVS, MVVS
Number of cores 2-core cable
Cable diameter AWG 16 (1.25 mm2)
Max. extension (Note 1) 219 yd. (200 m)
Total extension (Note 2) 547 yd. (500 m)
Terminal block TB5 [A] [B]
Cable PZ-62DR-EA 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, and connection cable for IT communication appliances)
Table 2-1
M-NET transmission cable specifications
(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
Table 2-2
Remote controller transmission cable specifications

─ 16 ─
Function Name
Terminal or
connector on
the circuit board
Signal
specifications
Materials Used
Total
extension
External control input
(volt-free contact) (Note 4) TM2 [Y] [Z] Level/pulse (Note 1)
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) (Note 4) TM2 [1] [2] Level/pulse (Note 1)
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)
AWG 20 (0.5 mm2) to AWG 15
(1.5 mm2) sheathed PVC cable
55 yd.
(50 m)
Remote/local switching (Note 4) CN32 [1] [3] Level
(Volt-free contact)
Remote ON/OFF adaptor
(PAC-SE55RA-E or PAC-715AD)
11 yd.
(10 m)
Remote ON/OFF input (Note 4) CN32 [1] [2]
Fan speed 4 input (volt-free contact)
(Note 3) CN17 [1] [2]
Level
(Volt-free contact)
Remote display adaptor
(PAC-SA88HA-E or PAC-725AD)
Fan speed 3 input (volt-free contact)
(Note 3) CN17 [1] [3]
Fan speed 2 input (volt-free contact)
(Note 3) CN17 [1] [4]
Fan speed 1 input (volt-free contact)
(Note 3) CN17 [1] [5]
Bypass mode input (volt-free contact)
(Note 3) CN26 [1] [2]
Fan speed switching input
(0 to 10 V DC) (Note 3) CN26 [4] [5] Analog
Table 2-3 External input/output specifications
<Caution>
• In the group with the multiple Lossnay units, input the signals to the main Lossnay (with address number 1 or
the smallest number other than 0).
(Note 1) The input signal must conform to the following specifications:
Level signal Volt-free contact, 12 V DC, 24 V DC
Pulse signal Volt-free contact, 12 V DC, 24 V DC, the duration of ON and OFF should be 200 msec.
or more
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.
(Note 3) In the group with the multiple Lossnay units, make sure that:
• Connect the signal cables only to the main Lossnay unit when controlling the all Lossnay units
together using PZ-62DR-EA.
• Connect the signal cables to each Lossnay unit when controlling the Lossnay units individually with-
out using PZ-62DR-EA.
• The optional CO2sensor (PZ-70CSW-E, PZ-70CSB-E) cannot be used together.
(Note 4) In the group with the multiple Lossnay units, input the signal only to the main Lossnay unit (with
address number 1 or the smallest number other than 0).

─ 17 ─
No. Check Item Corrective action
1 Is the main Lossnay (and its address setting) set
correctly?
Check the address setting switches (SW11, SW12)
on the circuit board.
When controlling with external input signals without
connecting to MELANS, set one of the units in the
group as the main Lossnay (with address number 1
or the smallest number other than 0).
Connect the signal cables to the main Lossnay unit.
2 Are the function selection switches on the circuit
board set correctly to suit the required application?
Set the function selection switches (SW2, SW5) on
the circuit board correctly.
3 Is the applicable model used as the Lossnay
remote controller?
Use PZ-62DR-EA or PZ-43SMF-E.
(The air conditioner remote controller including
PAR-40MAA cannot be used.)
4 When PZ-62DR-EA is used, are the function selec-
tions set correctly to suit the required application?
Set the function selections correctly.
After setting the functions with PZ-62DR-EA, oper-
ating the model selection switch (SW6) or address
setting switches (SW11, SW12) on the control cir-
cuit board resets the settings to the initial settings.
5 For a function that can be set with both
PZ-62DR-EA and the function selection switches on
the control circuit board, was the function set with
the function selection switches after the function is
set with PZ-62DR-EA?
Set the function again with PZ-62DR-EA.
For the function that can be set with both
PZ-62DR-EA and the function selection switches,
after the function was set with PZ-62DR-EA, setting
with the function selection switches is disabled.
[4] Function setting
Terminal block TM3 [9] [10]
Function Name Operation monitor (Factory default setting) (Note 1)
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
(Note 1) Output can be changed with function settings.
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 in. (5 cm)
away from signal cables?
Wire the power supply cable at least 2 in. (5 cm)
away from the signal cables.
4 Is the signal cable connected to the designated ter-
minal 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
tighten the screws firmly.
6 Is the output capacity of the signal cable within rat-
ing? (See Table 3-1.)
Use the signal cable within rating.
7 Is the function selection for the external output sig-
nal set correctly?
Set the function selection switches (SW5-1 and 5-2)
on the circuit board correctly, or set the function set-
tings (No. 12 to 16) of PZ-62DR-EA correctly.
[3] Monitor output signal cable

─ 18 ─
No. LED Contents Check Item Corrective action
1 LED1
(green)
Lossnay unit error
indicator
Blinking: Starting up, error occurred In the case of an error, 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
information
When not using M-NET, it is normal.
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 group with multiple
Lossnay units.
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 supplied
to the control circuit board.
(Do not touch the circuit board when the
LED is lit to avoid electric shock.)
5 LED6
(red)
Power supply
indicator (power
circuit board)
Check that this LED is lit. The LED lights while power is supplied
to the power circuit board.
(Do not touch the circuit board when the
LED is lit to avoid electric shock.)
[5] LED Indications on the circuit boards

─ 19 ─
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 are
disconnected.
Check the connector (CN9) for the exhaust fan
motor and the connector (CN10) for the supply fan
motor.
*Before connecting or disconnecting the motor con-
nectors (CN9, CN10), turn off the power supply
isolator, and check that the all LEDs on the circuit
board are not lit.
The connectors between the
control circuit board and power
circuit board are disconnected.
Check the connector connections.
Control circuit board: CN14, CN19, (CN21)*
Power circuit board: CN114, CN119, (CN121)*
*Only for LGH-F940/1200 types.
Fan motor failure If the fan can be turned manually, replace the DC
motor of the fan.
Check the resistance between the motor leads.
(See (6) Motor resistance table (page 39).)
If the measured value is significantly different from
the values specified in the table, replace the DC
motor of the fan.
Circuit board failure If LED6 located between CN9 and CN10 on the
power circuit board is not lit, check power supply
to TAB1 and TAB2. If no error is found with power
supply, replace the power circuit board.
If the problem persists, replace the DC motor of the
fan.
Power with the rated voltage is
not supplied to the product.
Check the power supply voltage.
2 Though the remote
controller display
indicates the fan
is running, the fan
stops by itself.
The Lossnay unit is operating
in the protective mode (inter-
mittent operation).
When PZ-62DR-EA is used, it displays the icon “ ”
that indicates the protective operation is in-progress.
For details, see the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.
The Lossnay unit is set to the
delay operation.
When PZ-62DR-EA is used, it displays the icon “”
that indicates the delay operation is in-progress.
When PZ-43SMF-E is used, it displays the icon
“” and the timer duration.
LED1 (green) on the control circuit board lights.
Lossnay operates in 30 minutes (or 15 minutes)
after the interlocked air conditioner is operated to
run.
Check the function selection switch (SW2-3) on
the circuit board or the function setting (No. 9) of
PZ-62DR-EA.
The interlocked air conditioner
(Mr. Slim indoor unit or City
Multi indoor unit) is stopped
due to defrosting.
The supply fan has been stopped to prevent cold
air from blowing out. When the air conditioner starts
operating, the fan operation is started automatically.
The ventilation switching
damper is operating.
The fan stops while the ventilation switching
damper is operating.
Also, the fan may stop temporarily to check the
damper operation regularly.
Individual function check items
[6] If Lossnay does not work in the trial operation, or if Lossnay stops working during use, check the following
items.

─ 20 ─
No. Problem Factor Corrective action
3[When wall-mounted
type CO2sensor
PZ-70CSW-E is
used]
The LED display
lamps of the CO2
sensor do not
light even though
the trial operation
switch (SW2-1) on
the Lossnay circuit
board is turned ON.
CO2sensor setting is set
incorrectly.
Check the setting.
• When the function setting (No. 66) of PZ-62DR-EA
is set to “0”, the function selection switches
(SW5-6 to SW5-8) on the Lossnay circuit board
should be: SW5-6 ON, SW5-7 OFF, SW5-8 OFF
• When the function setting (No. 66) of
PZ-62DR-EA is set to other than “0”, set it to “5”.
The connectors between the
LED circuit board (of the CO2
sensor) and control circuit
board (of the Lossnay unit) are
disconnected.
Check the connector connections.
LED circuit board: CN100
Control circuit board: CN34
For details about the CO2sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
The lead wires connecting the
LED circuit board (of the CO2
sensor) and control circuit
board (of the Lossnay unit) are
broken.
Measure the voltage between the pins of connec-
tor (CN100) with the trial operation switch (SW2-1)
ON. When the values shown below are detected,
the lead wires are not broken.
• Between the pins 1 and 2 of CN100, voltage is
applied in a cycle of 20-second 0 V and 10-sec-
ond 12 V DC.
• Between the pins 1 and 3 of CN100, voltage is
applied in a cycle of 20-second 0 V and 10-sec-
ond 12 V DC.
• Between the pins 1 and 4 of CN100, voltage is
applied in a cycle of 20-second 0 V and 10-sec-
ond 12 V DC.
When extending the CO2sensor wiring cables,
check that they are properly connected.
For details about the CO2sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
LED circuit board failure If the problem persists, replace the wall-mounted
type CO2sensor.
For details about the CO2sensor
PZ-70CSW-E, see its Installation and Instruction Manual.
4[When wall-mounted
type CO2sensor
PZ-70CSW-E is
used]
CO2concentra-
tion display of
PZ-62DR-EA does
not change even
though the number
of persons in a room
is changed.
Ventilation air volume by the
Lossnay unit is large enough or
too small against the change in
the number of persons in a room.
In this case, CO2concentration displayed value
may be always low or high.
The lead wires connecting the
CO2sensor circuit board and
Lossnay control circuit board
are broken.
If the lead wire to pin 3 of the connector on the CO2
sensor circuit board is broken, detected CO2con-
centration value may be fixed.
When extending the CO2sensor wiring cables,
check that they are properly connected.
For details about the CO2sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
The lead wires connecting the
LED circuit board (of the CO2
sensor) and control circuit
board (of the Lossnay unit) are
broken.
Check the connector connections.
LED circuit board: CN100
Control circuit board: CN34
When extending the CO2sensor wiring cables,
check that they are properly connected.
For details about the CO2sensor PZ-70CSW-E,
see its Installation and Instruction Manual.
5 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 oper-
ation is set to be used, the fan continues operating for
three minutes after the stop operation.
Check the function settings (No. 12 to 16) of
PZ-62DR-EA. (See the Lossnay Operating/Installation
Instructions or PZ-62DR-E Instruction Book.)