Mitsubishi Electric Lossnay VL-220CZGV-EB 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
VL-220CZGV-E
VL-220CZGV-EB
Nameplate
April 2016 No. U209
Remote controller (Optional)
PZ-61DR-E
PZ-43SMF-E
Filter (Optional)
P-220SHF-E
P-220EMF-E
P-220F-E

Contents
1. Safety precautions ....................................................................... 3
2. Specifications ............................................................................... 4
3. Names and functions of components .......................................... 5
4. Outside dimensions................................................................... 6-8
5. Electrical wiring diagram ............................................................. 9
6. Circuit board diagrams ..........................................................10-11
7. Troubleshooting .................................................................... 12-28
8. Before receiving repair requests ............................................... 29
9. Service inspection list ................................................................ 29
10. Overhauling procedures
....................................................... 30-38
11. Parts catalog
........................................................................ 39-55
VL-220CZGV-E ............................................................... 40-47
VL-220CZGV-EB............................................................. 48-55

─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 VL-220CZGV-E, VL-220CZGV-EB
Heat exchange system Heat recovery ventilating system
Heat exchanger material Water-resistant paper sensible heat exchanger
Cladding Galvanized steel sheet
Heat insulation material Noncombustibility polyethylene foam
Motor EC motor
Filter Non-woven fabrics filter (Gravitational method 82%, EN779: 2012: G3)
Surrounding air condition Shall be between 0°C and 40°C, 80%RH or less
Suction air condition Shall be lower than 40°C, 95%RH
Supply fan operation under low outdoor
temperature
0°C to -5°C: Intermittent operation 24 min ON, 6 min OFF
-5°C or less: Continuous supply air stopped
Function
Heat recovery ventilation/ Bypass ventilation, Fan speed 1,2,3,4
(When the optional motorized damper (P-133DUE-E) is used, bypass
ventilation mode can be switched.)
Electrical power supply 220-240 V/50 Hz, 220 V/60 Hz
Ventilation mode Heat recovery mode
Fan speed Fan speed 4 Fan speed 3 Fan speed 2 Fan speed 1
Running current (A) 0.60 0.29 0.18 0.11
Input power (W) 80 35 18.5 8.5
Air volume (m3/h) 230 165 120 65
(L/S) 64 46 33 18
External static pressure (Pa) 164 84 44 13
Temperature exchange efficiency (%) 82 84 85 86
Noise (dB) 31 25 19 14
Weight (kg) VL-220CZGV-E: 31, VL-220CZGV-EB: 32
Insulation resistance 10 MΩor more
Dielectric strength 1000 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
Attention:
•
The running current, the input power, the efficiency and the noise are based on the rating air volume, and 230 V/50 Hz.
The noise is measured at 1.5 m under the center of the unit in an anechoic chamber.
• Temperature exchange efficiency (%) is based on winter condition.
• Mitsubishi Electric measures figures in the chart according to Japan Industrial Standard (JIS B 8628), therefore
the characteristic curves are measured by chamber method.

─5 ─
3. Names and functions of components
Supply air filter fixing knob
Release it to remove the
supply air filter case.
(3 locations)
Exhaust air filter fixing knob
Release it to remove the
exhaust air filter case.
(2 locations)
Lossnay core
Lossnay core exchanges
heat between the supply air
and the exhaust air.
Supply air filter case
It holds the supply air filter or
high efficiency supply air filter.
Exhaust air filter case
It holds the exhaust air
filter or medium efficiency
exhaust air filter.
Drain pan (supply air side)
It holds dew condensation
water that occurs inside the
Lossnay unit.
Drain outlet
It is for discharging dew
condensation water that has
built up in the drain pan to
outside the room.
Supply air filter
It removes insects, pollen,
dirt, dust, and other particles
from the outside air that is
taken into the room.
Exhaust air filter
It prevents Lossnay core
from clogging.
After the supply air filter case is
removed
Piping example
• When connecting the RA (return air) to a bathroom, be
sure to branch the pipe into two lines and intake return
air from two locations, the bathroom and living room
(kitchen/dining room).
RA 1
OA
Name of Connection Point Connection Location
RA
(Return air)
RA1 For intake from living room, toilet, wash
basin, bathroom, etc.
RA2* For optional air duct switching damper
(P-133DUE-E)
Exclusive for intake from living room, toilet,
wash basin, bathroom, etc.
RA3*
EA
(Exhaust air) For exhaust air of inside air
OA
(Outside air) For intake of outside air
SA
(Supply air) For air supply opening to living room
* When RA2 and RA3 are used, use grills equipped with filter.
Lossnay
EA
(exhaust air)
OA
(outside air)
SA
(supply air)
Bath
(Bathroom)
RA1
(return air)
Outdoor
side
Indoor
side
RA3
RA2
Kitchen /
dining room
Air duct
switching damper
(P-133DUE-E)
(Optional)

─6 ─
4. Outside dimensions
VL-220CZGV-E
Lossnay unit
80
8
174 119 33
8
234
362
ij
146
ij
124
ij
98
31
848
116850
775
20
271 229
295
199
86143
139
885
815
720
151
320
31
Drain outlet
Ceiling suspension
Duct connecting
Duct connecting
SA
(supply
air)
RA1
(return air)
EA
(exhaust
air)
OA
(outside air)
Duct connecting Duct connecting
Drain pan
Working space (required space around Lossnay unit)
720
EA SA
OA RA1
245
86
199
320
RA1
OA
234295
850
Drain outlet
Leave at least
100 mm of space
Leave at least
650 mm of space
Leave at least
700 mm of space
Leave at least
900 mm of space
Space required for
removing and inserting
Circuit
Air duct switching damper
(Optional)
Air duct
switching damper
(Optional)
Unit (mm)

─7 ─
VL-220CZGV-EB
80
8
174
20
119 33
8
234
362
ij146
ij124
ij98
31
848
116850
775
20
10
271 229
295
199
86143
139
885
815
720
151
320
31
20
Ceiling suspension
Duct connecting
Duct connecting
SA
(supply
air)
RA1
(return air)
EA
(exhaust
air)
OA
(outside air)
Duct connecting Duct connecting
Insulation
Drain pan
720
EA SA
OA RA1
245
86
199
320 20
RA1
OA
234295
850
Drain outlet
100 mm of space
650 mm of space
700 mm of space
900 mm of space
Space required for
removing and inserting
Circuit
Drain outlet
Air duct switching damper
(Optional)
Lossnay unit
Working space (required space around Lossnay unit)
Leave at least
Leave at least
Leave at least
Leave at least
Air duct
switching damper
(Optional)
Unit (mm)

─8 ─
PZ-61DR-E
Unit (mm)
PZ-43SMF-E
Unit (mm)
P-220SHF-E, P-220EMF-E, P-220F-E
Model Dimension The number of
filters per set Applicable model
ABC
P-220SHF-E 362 189 15 2
VL-220CZGV-E
VL-220CZGV-EB
P-220EMF-E 353 183 15 2
P-220F-E 355 184 15 2
Note:
• Lossnay unit is provided with one set of the filters.
Unit (mm)

─9 ─
5. Electrical wiring diagram
VL-220CZGV-E, VL-220CZGV-EB
7
8
9
10
S
A
B
1
2
1
2
N
L
N
PE
L
M
1
M2
GM
CN7
CN118
CN119
CN10
CN9
LED6
TAB3,4
TAB2TAB5 TAB1
TH1(OA)
TM1
CN19
CN18
CN22
SW5
SW6
SW2
3
TM2
TB5
TM4
TM3
PZ-61DR-E
PZ-43SMF-E
LED3
LED4
LED2
LED1
REACTOR
2nd Lossnay unit
(Max. 2 units)
Lower Printed
Circuit Board
(Power circuit board)
DAMPER
(Option)
Upper Printed
Circuit Board
(Control circuit board)
Definition of symbols
M1: Motor for exhaust fan
M2: Motor for supply fan
GM: Motor for By-pass damper
TH1: Thermistor for outside air
SW2,5: Switch (Function selection)
SW6: Switch (Motorized damper (option) selector)
TM1: Terminal block (Power supply)
TM2: Not in use
TM3: Not in use
TM4: Terminal block (Transmission cable)
TB5: Not in use
TAB1, TAB2, (TAB5): Connector (Power supply)
TAB3,TAB4: Connector (Reactor)
CN7: Connector (Motor for By-pass damper)(Option)
CN9: Connector (Fan motor)
CN10: Connector (Fan motor)
CN18: Connector
CN118: Connector
CN19: Connector
CN119: Connector
CN22: Connector (Thermistor OA)
LED1: Inspection indicator lamp
LED3:
Remote controller power supply indicator lamp
LED4, LED6: Power supply indicator lamp
SYMBOL : Terminal block
: Connector on PCB
* TM1, TM4 shown in dotted lines are field work.
* CN7 (DAMPER) is optional.
* 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 information in the chart below.
Inrush current after power supply ON 10 ms 6.1 A
100 ms 3.6 A

─10 ─
1s digit10s digit
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: 0 ȍ
During heat recovery mode:

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
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
SW6
Air duct switching damper selector
(Only when the air duct
switching damper (P-133DUE-E)
is installed)
SW2
SW5
Function selection
switch
Indication of the
microcomputer
software version
Error indicator
(LED1 Green)
Normal: unlit
Error: blinking
During delay operation: lit
Power supply indicator
for the circuit
(LED4 Red)
Outdoor air (OA)
thermistor
6. Circuit board diagrams
Circuit board diagram 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 and CN119) 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)
12 to 14 V DC
(Insulated)
GND
(Insulated)
14 to 16 V DC
(Not insulated)
Lot number
indication
Reactor
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
220 to 240 V/50 Hz
220 V/60 Hz
Fuse
10 A/250 V
Fuse
5 A/250 V
(Only when the air duct
switching damper (P-133DUE-E)
is installed)

─12 ─
Applicable Device Applicable Model
Lossnay Heat Recovery Ventilator VL-220CZGV-E, VL-220CZGV-EB
Lossnay Remote Controller PZ-61DR-E, PZ-43SMF-E
Air Duct Switching Damper
(Lossnay Heat Recovery Ventilator System Component)
P-133DUE-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 of the product
• Model name of the Lossnay remote controller, and whether the air duct
switching damper is installed or not
• 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
7. Troubleshooting
Work precautions
• When removing or touching the cables, circuit board 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, be sure to recreate the malfunction two or three times before starting repairs.
• When servicing, always take care to keep proper footing.
• Before starting the service, always turn off the power supply isolator. Sufficient care must be taken to avoid
electric shock or injury.
• Make sure to connect the power supply wires correctly.
• 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.
The part names in the texts are standardized with the part names in the parts catalog. (There are some
exceptions.)
7-1 Service flowchart
After checking the check items below, follow the troubleshooting for servicing.
Note: This device (VL-220CZGV-E, VL-220CZGV-EB) is not compatible with M-NET. When connected to
M-NET, a malfunction may occur or an error code may be displayed.

─13 ─
Lossnay does not work after installation
is completed.
Lossnay does not work in the trial op-
eration after installation is completed, or
Lossnay works abnormally during use.
The remote controller does not work
after installation is completed.
Operations such as ON/OFF, fan speed
or ventilation mode switching are
disabled on the remote controller after
installation is completed.
Lossnay does not work properly after
installation 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.
1Power 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)?
220-240 V/50 Hz, 220 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
terminals (TM1, TAB1, and TAB2)?
Connect the lead wires securely.
7 Is there a faulty connection on the reactor terminals
(TAB3 and TAB4)?
Connect the lead wires securely.
8 Are the power supply indicator lamps (LED4 and
LED6, red) lit?
Check the above items.
(1) Failure mode 1: Lossnay does not work, or
Lossnay works abnormally.
(2) Failure mode 2: The remote controller does not
work.
(3) Failure mode 3: Operations on the remote control-
ler are disabled.
(4) Failure mode 4: Lossnay does not work properly.
(5) Failure mode 5: Error code and LED display
Water leaks from the Lossnay unit. (6) Failure mode 6: Water leaks from the Lossnay unit.

─14 ─
No. Check Item Corrective action
1 Are the designated cables used for the remote control-
ler transmission cable? (See Table 2-1.)
Use the designated transmission cables.
2 Are the designated cables used for the external input/
output signal cable? (See Table 2-2.)
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 5 cm away
from transmission cables?
Wire the power supply cable at least 5 cm away
from the transmission cables.
6 Are the transmission cables connected to the desig-
nated terminal block? (See Table 2-1.)
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.)
Wire the cables within the regulations.
9 Does the external input signal match the specifica-
tions? (See Table 2-2.)
Input the signal that matches the specifications.
10 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).
11 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 PZ-61DR-E or PZ-43SMF-E
transmission cable
Type Sheathed cable
Number of cores 2-core cable
Cable diameter 0. 3 mm2(AWG22)
Total extension 200 m
Terminal block TM4 12
2Transmission cables (remote controller transmission cable, and external input/output signal cable)
Table 2-1
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 13 Level/pulse (Note 1)
Single-lead 0.8 to 1.2 mm dia. or
twisted lead 0.5 to 1.5 mm2500 m
External control input
(12 V DC, 24 V DC) TM2 12 Level/pulse (Note 1)
Single-lead 0.8 to 1.2 mm dia. or
twisted lead 0.5 to 1.5 mm2(Note 2)
Remote/local switching CN32 13 Level
(Note 1)
Remote ON/OFF adaptor
(PAC-SE55RA-E)
10 m
Remote ON/OFF input CN32 12
Fan speed 4 input (volt-free contact) CN17 12
Level
(Note 1) Remote display adaptor
(PAC-SA88HA-E)
Fan speed 3 input (volt-free contact) CN17 13
Fan speed 2 input (volt-free contact) CN17 14
Fan speed 1 input (volt-free contact) CN17 15
Bypass mode input (volt-free contact)
*Only when P-133DUE-E is installed
CN26 12
Fan speed switching input
(0 to 10 V DC) CN26 45 Analog
Table 2-2 External input/output specifications
<Caution>
• When connecting two Lossnay units and using external input/output, input the signals to the Lossnay (SW5-
10 ON, with the smallest address setting) set as the main Lossnay.
(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.

─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 two Lossnay
units, set one of the units 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 and SW5)
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
PAR-31MAA 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.
4Function setting (See the Lossnay technical manual for details.)
Terminal block TM3 90 TM3 80 TM3 70
Function Name Operation monitor
After-heater Malfunction monitor Bypass monitor
Signal specifications Volt-free contact
Output rating 240 V AC, 1 A
24 V DC, 1 A
Min. applicable load 220 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 5 cm away
from signal cables?
Wire the power supply cable at least 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
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
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.)
3Monitor output signal cable

─17 ─
No. LED Contents Check Item Corrective action
1 LED1
(green)
Lossnay main unit
error indicator
Blinking: Starting up, or error oc-
curred
See Failure Mode 5.
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
Unlit 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 an-
other Lossnay unit in the case of using
two 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 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.)
5LED Indications on the circuit board

─18 ─
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 discon-
nected.
Check the connector (CN9) for the exhaust fan
motor and the connector (CN10) for the supply
fan motor.
The connector between the con-
trol circuit board and power circuit
board is disconnected.
Check the connector connections
(CN18-CN118 and CN19-CN119).
The temperature around the prod-
uct is high.
Use the product at a temperature of 40°C or
lower.
Fan motor failure Check the resistance between the motor leads.
(See chapter 7. (8) Motor resistance table (page 28).)
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
connectors 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.
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 (intermittent
operation).
When PZ-61DR-E is used, it displays the icon
"" that indicates the protective operation is in-
progress. For details, see the 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 external signal is input 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 temperature around the prod-
uct is high.
When the ambient temperature of the product
is high (higher than 40°C), the fan may stop to
prevent the fan motor from overheating.
3 The fan does not
stop even though
the remote control-
ler is operated to
stop operation.
The after-heater is set to be used.
If the after-heater is set to be used, the fan con-
tinues operating for three minutes after the stop
operation.
Check the function selection switches (SW2-8
and 5-2) on the circuit board or the function set-
tings (No. 57 and 58) of PZ-61DR-E. (See the
Lossnay technical manual.)
Individual function check items
If Lossnay does not work in the trial operation after installation is completed, or if Lossnay works abnormally
during use, check the following items.

─19 ─
No. Problem Factor Corrective action
4 Even though the
remote controller is
operated to change
the fan speed, the
fan speed does not
change.
The indoor negative pressure
setting or the indoor positive pres-
sure 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 installation 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 set-
ting (No. 63) of PZ-61DR-E. (See the Lossnay
technical manual.)
The system is operating 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 remote controller manual.
5 The fan operation is
unstable.
The motor rotation speed is under
control.
This product controls the motor by detecting the
motor rotation speed. The fan operation may be
unstable during rotation speed control (for maxi-
mum about 10 minutes).
6 The damper does
not operate even
though the trial
operation switch
(SW2-1) on the cir-
cuit board is turned
ON.
*Only when the
air duct switch-
ing damper
(P-133DUE-E) is
installed.
The connector between the
geared motor and circuit board is
disconnected.
Check the connection of the connector (CN7) on
the power circuit board.
The air duct switching damper
selector (SW6) is not set correctly.
Turn off the switch (SW6-1).
When operating two Lossnay units, turn off the
switch (SW6-1) of both Lossnay units.
Geared motor failure of the air
duct switching damper
Turn the trial operation switch (SW2-1) ON.
The geared motor operates in about several
seconds.
If the geared motor does not operate, replace
the geared motor. (For details about the air
duct switching damper, see the handbook for
P-133DUE-E.)
Circuit board failure of the
Lossnay unit
Disconnect the connector (CN7) from the power
circuit board and check the voltage value be-
tween the pins of CN7 when the trial operation
switch (SW2-1) is turned ON.
(Voltage is output in about several seconds after
switch ON.)
If there is no voltage value, replace the circuit
board.
If the problem persists, replace the geared mo-
tor of the air duct switching damper. (See the
handbook for P-133DUE-E.)
7
Even though the
remote controller is
operated to change
the ventilation mode,
the ventilation mode
is not changed.
*Only when the
air duct switch-
ing damper
(P-133DUE-E) is
installed.
The outdoor temperature is 8°C
or lower.
When the outdoor temperature is 8°C or lower,
the ventilation mode is fixed to the Heat recov-
ery mode.
The signal is input to the Bypass
mode switching input (CN26
12).
Check the Bypass mode switching input (CN26
12). (See the Lossnay technical manual.)

─20 ─
No. Problem Factor Corrective action
8 The ventilation
mode cannot be
switched when
Lossnay is operat-
ing in the automatic
mode.
*Only when the
air duct switch-
ing damper
(P-133DUE-E) is
installed.
Temperature condition for Heat
recovery mode or Bypass mode is
not satisfied.
Check the temperature map.
For details, see the Lossnay installation manual.
Temperature condition is not set
correctly.
Set the lower limit to temperatures lower than
that of the upper limit.
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 8°C
or lower.
When the outdoor temperature is 8°C or lower,
the ventilation mode is fixed to the Heat recov-
ery mode.
The signal is input to the Bypass
mode switching input (CN26
12).
Check the Bypass mode switching input (CN26
12). (See the Lossnay technical manual.)
9 The Lossnay unit
generates abnormal
sounds or vibra-
tions.
Fan operation failure Set the supply/exhaust fan power up setting.
(See the Lossnay installation manual.)
The filters (filter assemblies) are
not securely installed.
Check that the filters (filter assemblies) are
securely installed.
Filters are clogged. Clean the filters.
The Lossnay unit is not securely
installed.
Check that the Lossnay unit is securely in-
stalled.
The ceiling suspension fixtures
(hangers) or anchor bolts are
loosened.
Retighten the ceiling suspension fixtures (hang-
ers) or anchor bolts.
The ducts are not securely con-
nected.
Check that the ducts are securely connected.
Foreign matter is stuck to the
centrifugal fans.
Remove the foreign matter.
It may lose the balance of the centrifugal fan.
The Lossnay unit generates
sounds at the time of the ventila-
tion mode switching
.
*Only when the air duct switch-
ing damper (P-133DUE-E) is
installed.
When ventilation mode has been changed, the
air duct switching damper makes operating
sounds. It is normal.
10 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 air duct switching damper
selector (SW6) is not set correctly
after the circuit board is replaced.
Make the switch (SW6) setting appropriate for
the model.
SW6-1 SW6-2 SW6-3 SW6-4
Without the damper ON ON ON ON
With the damper OFF ON ON ON
The indoor negative pressure
setting or the indoor positive pres-
sure 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.