Mitsubishi Electric Lossnay LGH-F300RX3-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
MODELS
LGH-F300RX3-E
LGH-F600RX3-E
LGH-F1200RX3-E
Nameplate
Nameplate
April 2018 No. U112-B

Contents
Safety precautions........................................................................3
1. Specifications ....................................................................... 4-5
2. Dimensions .......................................................................... 5-6
3. Wiring diagrams ................................................................... 7-8
4. Troubleshooting ................................................................. 9-22
4-1 Service Flow................................................................ 9-10
4-2 Items to Check........................................................... 11-21
4-3 Circuit Test Point............................................................. 22
5. Overhaul procedures........................................................ 23-28
5-1 Blower Parts.............................................................. 23-25
5-2 Damper Movement Motor Part (All units available)... 25-26
5-3 Circuit Board Part...................................................... 26-28
6. Parts list ........................................................................... 29-41
LGH-F300RX3-E ........................................................... 30-33
LGH-F600RX3-E ........................................................... 34-37
LGH-F1200RX3-E ......................................................... 38-41

—3—
♦♦
Turn off the power supply
Be sure to shut off the breaker before dis-
assembling the unit for repair.
(Failure to heed this warning may result in elec-
tric shock.)
♦♦
Use proper parts and tools
For repair, be sure to use the parts listed in the service
parts list of the applicable unit model and
use the proper tools.
(Failure to heed this warning may result in elec-
tric shock, fire and/or bodily injury.)
♦♦
Proper electric work
Use the electric wires designated for electric work, and
conduct electric work in accordance with the "Electric
Installation Engineering Standard," the "Indoor Wiring
Regulations," and the Installation Work
Guide.
(Incomplete connection or wiring installation may
result in electric shock and/or fire.)
♦♦
Replace damaged and/or degraded parts
Be sure to replace the power-supply cord and lead wire
in the event that they are damaged and/or
degraded.
(Failure to heed this warning may result in elec-
tric shock and/or fire.)
♦♦
Check insulation
Be sure to measure the insulation resistance once the
repair work is complete, and turn on the power supply
after verifying that an insulation resistance
of at least 10MΩis obtained.
(If an insulation problem exists, it may result in
electric shock.)
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Safety precautions
●Please be sure to read the following safety precautions thoroughly before commencing with the maintenance
work, and conduct the inspection and repair of the product in a safe manner.
●The types and levels of danger that may arise if the product is handled incorrectly are described by using the
warning symbols shown below.
♦♦
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 elec-
tric shock.)
Caution for
electric shock
♦♦
Modification is prohibited
Do not modify the unit.
(Failure to heed this warning may result in elec-
tric shock, fire and/or bodily injury.)
Prohibited
Incorrect handling of the product may result in serious injury
or death.
Warning
♦♦
Caution for bodily injury
Do not conduct any work at a location
where you do not have a sure footing.
(Failure to heed this caution may result in a fall.)
Prohibited
Be sure to follow
this instruction.
♦♦
Wear gloves
Wear gloves when conducting work.
(Failure to heed this caution may result in injury
to your hands from sharp metal or other edges.)
•Inspect the grounding, and repair it if incomplete.
●Make sure that the product operates correctly upon completion of repair. Clean the product as well as the sur-
rounding area, and then notify the customer of the completion of repair.
Incorrect handling of the product may result in serious injury
or damage to properties including buildings and equipment.
Caution
Request during repair

—4—
1. Specifications

2. Dimensions
Unit (inch)
LGH-F300RX3-E,LGH-F600RX3-E
—5—

Unit (inch)
LGH-F1200RX3-E
—6—

Symbol explanation
• PZ-41SLB-E and PZ-52SF-E cannot be used simultaneously.
M1: Motor for exhaust fan
M2: Motor for supply fan
C: Capacitor
GM: Motor for Bypass move-
ment
LS: Microswitch
TH1: Thermistor for outside air
TH2: Thermistor for return air
SW1: Switch
(Main/Sub change)
SW2,5: Switch (Function selec-
tion)
SW3: High/E.High select switch
(Exhaust fan)
SW4: High/E.High select switch
(Supply fan)
TM1: Terminal block
(Power supply)
TM2: Terminal block
(Transmission cable and
external control input)
TM3: Terminal block (Monitor
output)
TB5: Terminal block
(M-NET Transmission
cable)
S1,S2: Connector (Power sup-
ply)
TR: Control circuit trans-
former
X7: Relay contact (For opera-
tion monitor output)
X8: Relay contact (For mal-
function monitor output)
CN1: Connector
(Transformer primary)
CN2: Connector
(Transformer secondary)
CN5: Connector
(Thermistor)
CN6: Connector
(Microswitch)
CN7: Connector (Motor for
Bypass operation)
CN8-1: Tab connector
(Fan motor)
CN8-2: Tab connector
(Fan motor)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN16: Connector (High/Low
switch)
CN32: Connector (Remote
control selection)
SA1: Address setting rotary
switch
(10 digit)
SA2: Address setting rotary
switch
(1 digit)
LED1: Inspection indicator lamp
LED2: Inspection indicator lamp
LED4: Power supply indicator
lamp
LED6: M-NET indicator lamp
3. Wiring diagrams
—7—
LGH-F300RX3-E,LGH-F600RX3-E
MARK : Indicates ter-
minal block
: Connector
: Board inser-
tion connector or
fastening connec-
tor of control
board
* Connect the wires shown as dotted lines.
* Be sure to connect the grounding wire.
* Breaker should be provided by the customer.

M1: Motor for exhaust fan
M2: Motor for supply fan
C: Capacitor
GM: Motor for Bypass movement
LS: Microswitch
TH1: Thermistor for outside air
TH2: Thermistor for return air
SW1: Switch(Main/Sub change)
SW2,5: Switch (Function selection)
SW3: High/E.high select switch
(Exhaust fan)
SW4: High/E.high select switch
(Supply fan)
TM1: Terminal block (Power supply)
TM2: Terminal block (Transmission
cable and external control
input)
TM3:
Terminal block (Monitor out-
put)
TB5: Terminal block (M-NET
Transmission cable)
S1,S2: Connector (Power supply)
TR: Control circuit transformer
X7: Relay contact (For operation
monitor output)
X8: Relay contact (For malfunc-
tion monitor output)
CN1: Connector (Transformer
primary)
CN2: Connector (Transformer sec-
ondary)
CN5: Connector (Thermistor)
CN6: Connector (Microswitch)
CN7: Connector (Motor for Bypass
operation)
CN8-1: Tab connector (Fan motor)
CN8-2: Tab connector (Fan motor)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN16: Connector (High/Low switch)
CN32: Connector (Remote control
selection)
SA1: Address setting rotary switch
(10 digit)
SA2: Address setting rotary switch
(1 digit)
MARK
: Indicates terminal block
: Connector
: Board insertion connector or
fastening connector of
control board
Symbol explanation
•PZ-41SLB-E and PZ-52SF-E cannot be used simultaneously.
—8—
LGH-F1200RX3-E
* Connect the wires shown as dotted lines.
* Be sure to connect the grounding wire.
* Breaker should be provided by the customer.

4. Troubleshooting
4-1 Service Flow
Confirmation items
1Condition of trouble – remote controller dis-
play, etc.
2Frequency of trouble – date of start of opera-
tion and occurrence
3Occurrence timing
4Existence of drawings, equipment (including
controllers and equipment sold separately),
cables, wiring, and settings.
Applicable models
Lossnay
LGH-F300 to F1200RX types
Remote controller
PZ-41SLB-E
PZ-52SF-E
Trouble Mode 1 The system will not start properly.
•Check the initialization checklist from
installation to operation (table 1-1).
•Check the system checklist (table 1-2).
Trouble Mode 2 •An error code displays on the remote
controller.
•The LED of the Lossnay circuit board is
blinking.
Check with the check code list (table 2).
Trouble Mode 3 The remote controller does not operate or
operates irregularly.
The Lossnay does not operate or operates
irregularly.
Trouble Mode 4
Check with the remote controller checklist
(table 3).
Check with the Lossnay checklist (table 4).
Precautions when diagnosing malfunctions
●When removing a transistor or printed circuit board, make sure the breaker is thrown.
●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.
●When servicing, be sure to recreate the malfunction 2 to 3 times before starting repairs.
●If a malfunction of the printed circuit board is suspected, check for disconnected wires in the print pattern, burnt parts or dis-
coloration.
●If the printed circuit board is replaced, make sure that the switch settings on the new board are the same as the old board.
—9—

Unit error
——
Error item
—«
«««
««
«
«««
«
«
«
—
«
—
«
—
«
————
—
—
—
—
« «««
—
—
«« «
«« «
—
«« ««
—
«« «
—
«« «
«
—
«« «
2 times
3 times
4 times
5 times
—
—
—
—
—
—
—
9 times
—
—
—
—
—
6 times
—
—
8 times
1 - 5
times
LED 6
turn off
—
4000/4116
*1)
3602
5101
5102
0900
6600
6607
6608
6607/6608
6602/6603/
6604
—
6608
•Cancellation
•Cancel damper operation
•Other controls as normal
• Lossnay ventilation
fixed (for “Auto”modes)
• Other controls as normal
• Lossnay ventilation
fixed (for “Auto”modes)
• Other controls as normal
•Fan: High speed
•Lossnay ventilation fixed
—
—
—
•Cancellation
—
—
•Cancellation
Fan motor
operation
device error
Damper motor
error
OA
temperature
sensor error
RA
temperature
sensor error
Test operation
Dual address
No ACK
No response
Controller
communication
error
Communication
circuit error
Polarity not set
PZ-41SLB-E
communica-
tion error
ClassificationCommunication error
Measures taken
by Lossnay
Remote
controller
display
error
code
LED 1
(green)
Display
(No. of
blinks)
LED 2
(red)
Display
(No. of
blinks)
Error
monitor
output
Reset
power
supply
Change
address
Stop
↓
Start
Error
delete
Cancellation measures
*1) “4000”is displayed on PZ-41SLB-E only.
Error List
—10—