Mitsubishi Electric Lossnay LGH-250RVXT-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
HANDBOOK
March 2016 No. U213
MODELS
LGH-150RVXT-E
LGH-200RVXT-E
LGH-250RVXT-E
Remote controller (Optional)
PZ-61DR-E
Nameplate
Filter (Optional)
PZ-150RTF-E
PZ-250RTF-E

Contents
1. Safety precautions ....................................................................... 3
2. Specifications ............................................................................... 4
3. Outside dimensions...................................................................... 5
4. Electrical wiring diagrams ......................................................... 6-7
5. Circuit board diagrams ............................................................. 8-9
6. Troubleshooting .................................................................... 10-34
7. Overhauling procedures
....................................................... 35-51
8. Parts catalog
........................................................................ 52-82
LGH-150RVXT-E ............................................................ 53-62
LGH-200RVXT-E ............................................................ 63-72
LGH-250RVXT-E ............................................................ 73-82

─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 incorrectly are described with the warning
symbols shown below.
Warning
Modification is prohibited
Do not modify the unit.
(Failure to heed 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 heed 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.)
Incorrect handling of the product may
result in serious injury or death.
Caution Incorrect 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 heed 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 heed 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 heed 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 heed 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 or an over-
load protection device is installed, if it is not installed, recommend the customer to install one.
Be sure to follow
this instruction.
Wear gloves
Wear gloves when servicing.
(Failure to heed 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. Specifications
Model name
Running
current
(A)
Input
power
(W)
Air volume Static pressure Exchange efficiency (%) Noise
(dB)
Weight
(kg)
(m3/h) (L/S) Supply
(Pa)
Exhaust
(Pa)
Temperature
Enthalpy
Heating Cooling
LGH-150RVXT-E 4.3 792 1500 417 175 100 80 70 69 39.5 156
LGH-200RVXT-E 5.4 1000 2000 556 175 100 80 72.5 70 39.5 159
LGH-250RVXT-E 7.6 1446 2500 694 175 100 77 68 65.5 43.0 198
Model name LGH-150RVXT-E, LGH-200RVXT-E, LGH-250RVXT-E
Heat exchange system Heat 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 (Gravitational method 82% EU-G3)
Surrounding air condition Shall be between -10°C and 40°C, 80%RH or less
Suction air condition Shall be lower than 40°C, 80%RH
Supply fan operation under low outdoor
temperature
-10°C to -15°C: Intermittent operation 60 min ON, 10 min OFF
-15°C or less: Intermittent operation 55 min OFF, 5 min ON
Function Energy recovery mode/Bypass mode, Fan speed 1, 2, 3, 4
Electrical power supply 220-240 V/50 Hz, 220 V/60 Hz
Insulation resistance 10 MΩor more
Dielectric strength 1500 V AC 1 minute
Model name PZ-61DR-E
Power supply requirement 12 V DC (Supplied from Lossnay unit)
Power consumption 0.3 W
Transmission cable Non polarized 2-wire (0.3 mm2(AWG22) sheathed cable)
Total wiring length 200 m maximum
Number of controllable Lossnay units 15 Lossnay units maximum (Max. 2 remote controllers installable)
Environmental condition Temperature: 0 to 40°C, Humidity: 30% to 90% relative humidity (no condensation)
Size 120 x 120 x 19 mm
Weight 0.25 kg
Color Munsell 1.0Y9.2/0.2
*The above values apply during Heat recovery mode ventilation when the fan speed is set to Fan speed 4 at the rating pressure
loss and 230 V / 50 Hz.
*For the specifications at the other fan speeds, see the spec. sheets.
*The values given in the table for the noise level reflect the levels measured at a position 1.5 meters 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 based on winter condition.
*Mitsubishi Electric measures products according to Japan Industrial Standard (JIS B 8628), therefore Q-H curves are meas-
ured by chamber method.
*On-site commissioning measurements by pitot tube method could be as much 20% different from JIS 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 vol-
ume correctly. A straight duct length more than 10D (D=duct diameter) from the source of turbulence is recommended for cor-
rect measurement. On-site measurement should therefore be measured in accordance with BSRIA guideline (Commissioning
Air System. Application procedures for buildings AG3/89.3(2001))

─5 ─
3. Outside dimensions
LGH-150RVXT-E, LGH-200RVXT-E, LGH-250RVXT-E
58
287
945.7 945.7
945.7 945.7
227
132
60
215
440
424
250
500
750
255
75090
750750115 250
560560210
ij258
ij242
OA EA
RA SA
50 1450
116
250
250
1500
1980
(exhaust air
outlet)
Exhaust
Supply
Pipe guide
Air exhaust fan (Outside)
Air exhaust fan (Inside)
(outside air
intake)
Lossnay cores
Flange
Flange
Flange
Control box
Air supply fan (Inside)
Air supply fan (Outside)
(return air) (supply air)
By-pass damper plate
By-pass damper plate
(6-15 X 30 oval)
Power supply
cable opening
:KHQXVLQJijGXFW
Ceiling suspension fixture
RA air filters
OA air filters
Unit (mm)
PZ-61DR-E PZ-150RTF-E, PZ-250RTF-E
A
B
15
Model Air Dimensions
The number of
filters per set
Applicable
Lossnay model
AB
PZ-150RTF-E
Supply 655 290 2 LGH-150RVXT-E
Exhaust 655 250 2
PZ-250RTF-E
Supply 985 290 2 LGH-200RVXT-E
LGH-250RVXT-E
Exhaust 985 250 2
Unit (mm) Unit (mm)
*The appearance varies depending on the model.

─6 ─
4. Electrical wiring diagrams
LGH-150RVXT-E, LGH-200RVXT-E
7
8
9
10
S
A
B
1
2
1
2
N
L
N
PE
L
CN7
CN118
CN119
CN10
CN9
TAB5
TAB1
TH1(OA)
TH2(RA)
TM1
CN19
CN18
CN22
CN5
SA2SA1
SW5
SW2
3
TM2
TB5
TM4
TM3
PZ-
61DR-E
CN26(WH)
CN32(WH)
CN17(RE)
TAB2
CN10
CN9
TAB2 TAB1
CN121
CN21
LED1
LED2
LED4
LED3
X13
X14
X15
LED6
LED6
CN20(GR)
GM
M1
M4
M3
M2
SUPPLY
FAN MOTOR
(Inside)
SUPPLY
FAN MOTOR
(Outside)
REACTOR
REACTOR
EXHAUST
FAN MOTOR
(Inside)
EXHAUST
FAN MOTOR
(Outside)
Bypass monitor or Pre-
heater signal output (*1)
Malfunction monitor
output (*1)
Operation monitor
output (*1)
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)
(*1)
MAX 240 VAC 1 A MIN 220 V AC 100 mA
24 V DC 1 A 5 V DC 100 mA
Isolator
(Field supply)
POWER SUPPLY
220-240V/ 50Hz
220V/ 60Hz
LINE
FILTER
Shielded Wire
COM
Printed Circuit Board 1
(Power circuit board 1)
Printed Circuit Board 2
(Power circuit board 2)
Printed Circuit Board
for control
(Control circuit board)
Definition of symbols
M1: Motor for supply fan (outside)
M2: Motor for supply fan (inside)
M3: Motor for exhaust fan (inside)
M4: Motor for exhaust fan (outside)
GM: Motor for By-pass damper
TH1: Thermistor for outside air
TH2: Thermistor for return air
SW2,5: Switch (Function selection)
TM1: Terminal block (Power supply)
TM2: Terminal block (External control input)
TM3: Terminal block (Monitor output)
TM4: Terminal block (Transmission cable)
TB5: Terminal block (M-NET Transmission cable)
TAB1, TAB2, (TAB5): Connector (Power supply)
X13: Relay contact
X14: Relay contact
X15: Relay contact
CN5: Connector (Thermistor RA)
CN7: Connector (Motor for By-pass damper)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN17: Connector (Fan speed 1/2/3/4)
CN18: Connector
CN118: Connector
CN19: Connector
CN119: Connector
CN20: For optional components
CN22: Connector (Thermistor OA)
CN26: Connector (By-pass, 0 - 10 V DC Fan speed control)
CN32: Connector (Remote control selection)
SA1: Address setting rotary switch (tens digit)
SA2: Address setting rotary switch (ones digit)
LED1, LED2: Inspection indicator lamp
LED3: Remote controller power supply indicator lamp
LED4, LED6: Power supply indicator lamp
SYMBOL : Terminal block
: Connector on PCB
* TM1, TM2, TM3, TM4, TB5 shown in dotted lines are field work.
* Be sure to connect the earth wire.
* A power supply isolator must be installed.
* Always use an isolator for the main switch power connection.
* Select proper circuit breaker according to the electrical current
shown in the right chart.
Model LGH-150RVXT-E LGH-200RVXT-E
Maximum current when operating 5.6 A 6.4 A
Inrush current after
power supply turned ON
10 ms 12.1 A
100 ms 6.6 A

─7 ─
LGH-250RVXT-E
7
8
9
10
S
A
B
1
2
1
2
CN7
CN118
CN119
CN10
TAB5
TH1(OA)
TH2(RA)
TM1
CN19
CN18
CN22
CN5
SA2SA1
SW5
SW2
3
TM2
TB5
TM4
TM3
PZ-
61DR-E
CN26(WH)
CN32(WH)
CN17(RE)
CN10
CN9
TAB2 TAB1
CN121
CN21
N
L
N
PE
L
LED1
LED2
LED4
LED3
X13
X14
X15
LED6
LED6
CN20(GR)
M2
M3
CN121
LED6
TAB2 TAB1
CN9
TAB2
TAB1
TAB2
TAB1
CN121
LED6
GM
M1
M4
GM
REACTOR
REACTOR
Bypass monitor or Pre-
heater signal output (*1)
Malfunction monitor
output (*1)
Operation monitor
output (*1)
M-NET-
transmission cable
2nd remote controller
(Max. 2 controllers)
2nd Lossnay unit
(Max. 15 units)
Isolator
(Field supply)
Shielded Wire
COM
Top Right Printed Circuit Board
(EA Inside)
(Top right power circuit board)
Printed Circuit Board for Control
(Control circuit board)
LINE
FILTER
12 V or
24 V DC
Mr. Slim
(non-polar)
Volt-free
contact
POWER SUPPLY
220-240V/ 50Hz
220V/ 60Hz
(*1)
MAX 240 VAC 1 A MIN 220 V AC 100 mA
24 V DC 1 A 5 V DC 100 mA
SUPPLY
FAN MOTOR
(Inside)
SUPPLY
FAN MOTOR
(Outside)
EXHAUST
FAN MOTOR
(Inside)
EXHAUST
FAN MOTOR
(Outside)
Top Left Printed Circuit
Board (EA Outside)
(Top left power circuit board)
Bottom Right Printed
Circuit Board (SA Inside)
(Bottom right
power circuit board)
Bottom left Printed
Circuit Board
(SA Outside)
(Bottom left
power circuit board)
Definition of symbols
M1: Motor for supply fan (outside)
M2: Motor for supply fan (inside)
M3: Motor for exhaust fan (inside)
M4: Motor for exhaust fan (outside)
GM: Motor for By-pass damper
TH1: Thermistor for outside air
TH2: Thermistor for return air
SW2, 5: Switch (Function selection)
TM1: Terminal block (Power supply)
TM2: Terminal block (External control input)
TM3: Terminal block (Monitor output)
TM4: Terminal block (Transmission cable)
TB5: Terminal block (M-NET Transmission cable)
TAB1, TAB2, TAB5: Connector (Power supply)
X13: Relay contact
X14: Relay contact
X15: Relay contact
CN5: Connector (Thermistor RA)
CN7: Connector (Motor for By-pass damper)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN17: Connector (Fan speed 1/2/3/4)
CN18: Connector
CN118: Connector
CN19: Connector
CN119: Connector
CN20: For optional components
CN21: Connector
CN121: Connector
CN22: Connector (Thermistor OA)
CN26: Connector (By-pass, 0 - 10 V DC Fan speed control)
CN32: Connector (Remote control selection)
SA1: Address setting rotary switch (tens digit)
SA2: Address setting rotary switch (ones digit)
LED1, LED2: Inspection indicator lamp
LED3: Remote controller power supply indicator lamp
LED4, LED6: Power supply indicator lamp
SYMBOL : Terminal block
: Connector on PCB
* TM1, TM2, TM3, TM4, TB5 shown in dotted lines are field work.
* Be sure to connect the earth wire.
* A power supply isolator must be installed.
* Always use an isolator for the main switch power connection.
* Select proper circuit breaker according to the electrical current
shown in the right chart.
Model LGH-250RVXT-E
Maximum current when operating 10.8 A
Inrush current after
power supply turned ON
10 ms 21.8 A
100 ms 11.9 A

─8 ─
1s digit10s digit
Power circuit board
Fed with power: lit
Not fed with power: unlit
Lot number indication
Remote controller
power supply indicator
(LED3 Green)
Bypass monitor output
Pre-heater output
(Between 7and 0)
During bypass mode or
when the pre-heater is operating: 0 ȍ
During heat recovery mode or
when the pre-heater is stopped:

ȍ
Malfunction monitor output
(Between 8and 0)
Error: 0 ȍ
Normal: ȍ
Operation monitor output
(Between 9and 0)
When Lossnay is operating: 0 ȍ
When Lossnay is stopped:

ȍ
Monitor output
COM
Remote controller
(PZ-61DR-E, etc.)
10 to 13 V DC
M-NET transmission
cable (Power supply
unit, etc.)
M-NET transmission
cable (Shielded)
External control input
Power circuit board
5 V DC (Insulated)
Power for the circuit
12 to 14 V DC
(Insulated)
GND
(Insulated)
Fed with power: lit
Not fed with power: unlit
SA1 SA2 SW6
Address setting
switch
Model selection
switch
SW2
SW5
Function selection
switch
Indication of the
microcomputer
software version
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
5. Circuit board diagrams
Circuit board diagram and check points
(1)Control circuit board

─9 ─
(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)
Lot number
indication
Short
Supply fan motor (CN10)
Pin No. of the connector
1Power for the motor: 280 to 360 V DC
2Not used
3GND
4Power for motor control: 14 to 16 V DC
5Speed command voltage: 0 to 6 V DC
6Rotational speed pulse
Exhaust fan motor (CN9)
Pin No. of the connector
1Power for the motor: 280 to 360 V DC
2Not used
3Not used
4GND
5Power for motor control: 14 to 16 V DC
6Speed command voltage: 0 to 6 V DC
7Rotational speed pulse
Fed with power: lit
Not fed with power: unlit
Power supply indicator
for motor control
(LED6 Red)
Control circuit
board
Damper motor output
220 to 240 V/50 Hz
220 V/60 Hz
Power supply input
(Reactor)
220 to 240 V/50 Hz
220 V/60 Hz
Fuse
10 A/250 V
Fuse
5 A/250 V

─10 ─
Applicable Device Applicable Model
Lossnay Energy Recovery Ventilator LGH-150RVXT-E, LGH-200RVXT-E, LGH-250RVXT-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.)
3Frequency 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 occurrence • Remote controller operation performed before fault occurrence
• Operating status, etc.
5 System settings • Function selection switch settings and address setting of the Lossnay unit
• Model name and address setting of the Lossnay remote controller or system
controller, etc.
• Function settings on PZ-61DR-E when PZ-61DR-E is used
6 System drawings • System Configuration
• Wiring
• Record of the Lossnay function setting statuses
6. 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 volt-
age 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, be sure to reproduce the malfunction two or three times before starting repairs.
• When servicing, always take care to 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 so as 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.
• If it is thought that there is a circuit board malfunction, check for disconnected wires in the print pattern,
burnt parts or discoloration.
• If the circuit board is replaced, 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.
• When carrying out wiring, power supply to M-NET must be turned off, otherwise it will cause a malfunction.
The part names in the texts are standardized with the part names in the parts catalog. (There are some exceptions.)
6-1 Service flowchart
After checking the check items below, follow the troubleshooting for servicing.