FILE NO. A02-012
Revised on : 2005/Feb./15
SERVICE MANUAL
HEAT EXCHANGE VENTILATORS
VN-250SE
VN-350SE
VN-500SE
VN-800SE
VN-1KSAE
VN-500SE
PRINTED IN JAPAN, Jan.,2003 ToMo
CONTENTS
1. SAFETY CAUTIONS ................................................................................. 3
2. TECHNICAL POINTS (PERFORMANCE) ............................................... 7
3. REFERENCE DRAWING FOR INSTALLATION ...................................... 7
4. SPECIFICATIONS...................................................................................... 8
5. NAME AND DIMENSION OF EACH PARTS.......................................... 11
6. WIRING DIAGRAM .................................................................................. 12
7. OWNER’S MANUAL (EXTRACT) ........................................................... 13
8. INSTALLATION MANUAL (EXTRACT) .................................................. 19
9. HOW TO DIAGNOSE THE TROUBLE..................................................... 24
10. HOW TO REPLACE THE MAIN PARTS.................................................. 25
11. CHECK WHEN REPAIR WORK COMPLETED...................................... 28
12. Q & A FOR HEAT EXCHANGE VENTILATORS .................................... 29
13. EXPLODED VIEWS AND PARTS LIST .................................................. 30
– 2 –
1. SAFETY CAUTIONS
The important contents concerned to the safety are described on the ventilator body and in this Service manual.
Preserve the described items after understanding clearly the following contents (indications/illustration symbols)
and reading this manual thoroughly.
n Explanation of indications
Indication
DANGER
WARNING
CAUTION
Damage of property : expanded damage concerned to property/household effects or domestic animals/pets
*
Indicates the contents which a danger such as death or serious injury is caused in
emergency on the repair engineers or the surrounding third party by an incorrect work.
Indicates the contents which a possibility such as death or serious injury is caused on the
repair engineers or the surrounding third party by an incorrect work, or on the customers
by a trouble of the products.
Indicates the contents which occurrence of injury (*) or damage of property is supposed
on the repair engineers or the surrounding third party by an incorrect work, or on the
customers by a trouble of the products.
Meaning
n Explanation of illustration symbols
Illustration symbol Meaning
Indicates prohibition (Never do it.).
The concrete contents of prohibition are indicated with illustrations or descriptions near
the illustration symbol.
Indicates forced work (Necessarily do it.).
The concrete contents of forced work are indicated with illustrations or descriptions near
the illustration symbol.
Indicates cautions (including danger/warning).
The concrete contents of cautions are indicated with illustrations or descriptions near the
illustration symbol.
1-1. Warning and caution exclusive in service work
WARNING
• Be sure to ask the customers not to let children close to the work place.
The tools or disassembled parts may cause an injury on children.
• Be sure to turn off the breaker before work when power-ON is unnecessary such as a case of
disassembling.
If doing so, an electric shock may be caused.
• Use the substitute parts corresponded to the model for repair. And do not modify the products.
It causes an abnormal operation or a trouble resulted in leakage or fire, that is a cause of customers’
disaster.
• For connection of the cut lead cables, connect the cables with application terminals, direct the closed
end side upward, and then apply the draining process.
If the post-process of connection is not carried out, a cause of customers’ disaster such as leakage or fire
generates.
• After the work, check the insulation resistance between live part (pin of SL terminal) and non-current
carrying part (motor frame) using a insulation megger (500V) and confirm 10MW or more is kept.
If the insulation resistance is not confirmed, a cause of customers’ disaster such as leakage or fire generates.
CAUTION
• Use the protective materials such as gloves, etc. for check/repair inside of the unit.
If touching inside of the unit with bare hands, an injury may be caused.
– 3 –
1-2. DANGER/WARNING/CAUTION Described in Owner’s Manual
DANGER
• Do not use as an air circulators for open-type burners (heaters).
When gas or oil stoves are used in the home, separate equipment for circulating the air should be used.
WARNING
• When any abnormal condition (scorching smell or others) is found, stop the operation immediately
and keep the exclusive circuit breaker “OFF”.
If you continue the operation without removing the cause, it could cause an electric shock or a fire.
• When the system needs a repair, consult your dealer.
• When the system is checked and the power cable undergoes maintenance, stop the operation, and
switch the exclusive circuit breaker “OFF”.
The internal fan is revolving at high speeds and can cause serious injury. And when using a stepladder,
etc., make sure to fix it properly.
• The external air intake opening should be positioned away from the exhaust openings of combustion
gases etc.
The intake of such gasses could lead to a lack of oxygen in the room.
• If there is combustible gas leakage from other appliances, ventilate the room by opening windows.
If operation were to be attempted in such a situation, sparking at electrical contact points could cause an
explosion.
• Netting or something similar should be provided at the external air intake opening to prevent birds
etc. interfering with the unit.
Nests or other foreign objects should be removed. That could lead to a lack of oxygen in the room.
• If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a
similarly qualified person in order to avoid a hazard.
• The external air intake opening should not be positioned where discharged air may directly enter it.
A situation like this will lead to the room being contaminated and this may pose a health risk.
• When Heat Exchange Ventilators are relocated, contact your dealer or a professional installer.
Improper practice of installation could cause a drop of the unit, a water leakage, an electric shock or a
fire.
• Ask the sales office or the engineering shop to perform the work.
• Don't push a finger or a stick into the open-air inlet or the exhaust outlet.
A fan with a high rpm will injure you.
• Modification of the system is strictly prohibited.
Improper practice of repair could cause a water leakage, an electric shock or a fire.
• When the system needs a repair, consult your dealer.
– 4 –
CAUTION
• If Heat Exchange Ventilators are not used for a long period of time, keep the exclusive circuit
breaker “OFF” for safety reasons.
If the power is left on, any build-up of dust could cause a heat generation or a fire.
• The system should never be used for any other purposes than intended such as for preservation of
foods, flora and fauna, precision devices or work of art.
• It could cause deterioration of foods or other problems.
• Install at a stable place of sufficient strength.
Please note that there might be some places not strong enough to install due the structure of building.
• Provide an exclusive circuit breaker that can completely break contacts on all the poles by more
than 3mm through direct connection to the power terminals.
Depending upon the environment for installation, it becomes necessary to install an earth leakage
breaker. Unless the earth leakage breaker is installed, it could cause an electric shock.
• Ask the sales office or the engineering shop to perform the work.
• Never fail to install the unit inside the heat insulting walls or, in other words, in the space insulated
from the open air.
If you install it outside or in the space equivalent to the open-air conditions, dew is condensed inside the
body in the winter season.
• The filter should be cleaned regularly.
Dust or dirt building-up on it can lead to a lack of oxygen in the room.
• Use gloves when cleaning the filter or heat exchange element.
Doing so will reduce any possibility of injury.
• It is strictly prohibited to place a container of combustible gas or liquid near Heat Exchange Ventilators or to spray it directly with the gas or liquid.
It could cause a fire.
• Do not use outside the rated voltage.
It could cause a fire or an electric shock.
• Combustion apparatus should not be placed allowing a direct exposure to wind of Heat Exchange
Ventilators.
Incomplete combustion could occur on the apparatus.
• Don’t put a container of water on Heat Exchange Ventilators.
When water spills, it is likely to enter inside the unit and degrade electric insulation, possibly resulting in
an electric shock.
• Don’t incline Heat Exchange Ventilators when taking them out.
Otherwise, water remaining inside is likely to drop and wet the furniture or other property.
• Ask the sales office or the engineering shop to perform the work.
• Do not install in locations where harmful or corrosive gasses may be present (i.e. acidic, alkali,
organic solvent, paint gasses etc. from machinery or factories)
Installation in such a location could cause a gas-poisoning and a fire.
• Do not install in locations where oily smoke or soot may be present.
There is a possibility that oil will adhere to the filter, heat exchange
• Do not install in locations with high humidity, such as close to bathroom etc.
Installation in such a location could cause a breakdown.
• Don’t use benzene or metal brush when cleaning the filter and heat exchange element.
Otherwise, the unit will get unfit for use.
• Don’t blow directly against animals or plants.
Likely to cause bad effect on animals and plants.
element etc.
and make operation impossible.
• Do not wash Heat Exchange Ventilators with water.
It could cause an electric shock.
• Do not handle switches with a wet hand.
It could cause an electric shock.
– 5 –
1-3. WARNING/CAUTION Described in Installation Manual
WARNING
Never fail to ask the sales office from which you bought the unit or the installing service shop to install the
unit. If you install it by yourself, any inappropriate installing works would cause an electric shock or a fire.
Carry out the installing works accurately in line with this installation manual. Improper practice of installation
could cause an electric shocks or a fire.
Choose the installing place where is endurable in quality as well as in weight, then install the unit accurately
with adequate strength and completeness of installation in accordance with the installation manual.
Otherwise, it is likely to cause an electric shock, a fire, a drop of the unit, thus causing the injury on the
human body.
Carry out electrical work in accordance with the laws and regulations prevailing in the country concerned,
technical standard and explanation for work, and make absolutely sure that an exclusive circuit is used.
Any insufficient capacity of power circuit and improper work can result in electric shock and fire hazard.
The external air intake opening should be positioned away from the exhaust openings of combustion gases
etc. The intake of such gases could cause a lack of oxygen in the room.
Netting or something similar should be provided at the external air intake opening to prevent birds etc.
interfering with the unit. Nests or other foreign objects should be removed.
That could cause a lack of oxygen in the room.
When the system is checked and the power cable undergoes maintenance, stop the operation, and switch
the exclusive circuit breaker “OFF”. Otherwise, it could cause an electric shock.
Carry out the GND work. Never connect the GND wire to a gas pipe, a water supply pipe, a lightning conductor, a GND line of a telephone, etc. An incomplete GND wire is likely to cause an electric shock.
CAUTION
Provide an exclusive circuit breaker that can completely break contacts on all the poles by more than 3mm
through direct connection to the power terminals. Depending upon the environment for installation, it becomes necessary to install an earth leakage breaker.
When you want to pierce the metal duct through the metal lath or the wire lath or the metal plate of the
wooden facility, do not forget to insulate electrically between the duct and the wall.
Otherwise, it would cause an electric shock or an electric leakage.
Don’t use other parts than specified (including the auxiliary parts) for installing works.
If you do not use the specified parts, it is likely to cause a drop of the unit, a fire, an electric shock, etc.
Install the outdoor duct in a falling gradient toward the outside so as to prevent water from coming in.
If it is not installed so, the building is likely to be flooded, wetting the household effects.
Heat-insulate the outdoor duct (including the indoor side, if necessary) to prevent dewing.
If heat insulation is not adequate, water likely goes indoor and wets the household properties.
When it is high humid and high temperature inside the ceiling, a ventilation system must be installed inside
the ceiling. Otherwise, it could cause a fire or an electric leakage.
Connect the power line and the connecting line with accuracy using the specified cables and fix them firmly
so as not to put the outer stress of the cables on the pin connecting area.
Incomplete connection or fixing is likely to cause a heat generation or a fire.
Install the power line and the connecting line with accuracy so the power source cover may not float.
If the installation of the power source cover is inappropriate, the pin connection area is likely to cause a heat
generation, a fire and an electric shock due to dust or powder.
Never install the unit near the place where there is a fear of leakage of an inflammable gas.
If gas happens to leak and stays around the unit, it is likely to cause a fire.
Don’t use the unit at the other voltages than the rated one. It could cause a fire or an electric shock.
Do not install the unit in locations with large amounts of oily smoke, such as food preparation areas.
It could cause a fire.
Don’t install the unit at the place of a high temperature or a flame. It could cause a heat generation or a fire.
Do not install in locations where harmful or corrosive gasses may be present (i.e. acidic, alkali, organic
solvent, paint gasses etc. from machinery or factories).
Installation in such a location could cause a gas-poisoning and a fire.
Do not install in locations with high humidity, such as close to bathroom etc. It could cause an electric shock
or an electric leakage etc.
– 6 –
2. TECHNICAL POINTS (PERFORMANCE)
• Energy-saving ventilation to save the cooling/heating cost because the heat energy (outside
air load) to be lost by ventilation is effectively recovered.
• Compact construction to downside the cooling/heating equipment with size corresponding
to heat energy amount to be recovered because the outside air load can be vastly decreased.
• By using the heat exchanger, humidity control effect which sucks the humidity approached
to near the humidity in the room.
• Comfortable ventilation by simultaneous air suction/discharge which sucked air approached
to the temperature in the room and the stable ventilation to be performed even in the high
airtight room.
• Noise-proof effect to prevent entering of outside noise or flowing of noise to outside.
• Suction/discharge air system on straight line which is easy to be designed or installed.
• The high-level long filter is mounted to increase the effect of dust collection for removing.
( Weight: 82%)
• Reverse installation up and down is possible, which 2 units use the same check port.
• Especially powerful notch is mounted, which can increase air volume and is selectable in the
main unit.
• Only one check port is used for all the maintenance works.
3. REFERENCE DRAWING FOR INSTALLATION
Supply Air Duct
SA
(Supply Air)
RA
(Outside Air)
Inside Supply Opening
(Supply/Exhaust Air Grill)
Pipe Hood
OA
(Outside Air)
Outside Intake Duct
EA
(Exhaust Air)
Heat Insulation
Material
Ceiling Suspension Bolt
Room Intake Duct
Room Intake Opening
(Supply/Exhaust Air Grill)
Exhaust Air Duct
Pipe Hood
– 7 –
<VN-250SE, VN-350SE>
4. SPECIFICATIONS
Model
Type
Ventilation system
Rating
Current (A)
Power consumption (W)
Air volume (m³/H)
Static pressure (pa)
CharacteristicsConstruction
Noise (dB)
Temp. exchange rate (%)
VN-250SE VN-350SE
Concealed duct type
Heat exchange Normal ventilation Heat exchange Normal ventilation
50Hz 220 – 240V, 60Hz 220V
Extra
high high high high
0.48–0.5 0.46–0.48 0.37–0.39 0.47–0.5 0.46–0.480.37–0.390.63–0.65 0.59–0.6
50Hz
60Hz
0.59 0.55 0.39 0.59 0.55 0.39 0.85 0.75 0.67 0.83 0.74 0.67
104–119 99–114 79–90 103–119 98–114 79–90 137–154 124–137 117–128 133–151 119–132 113–125
50Hz
60Hz
128 118 78 128 118 7 7 178 149 132 176 145 131
250 250 170 250 250 170 350 350 280 350 350 280
50Hz
60Hz
250 250 135 250 250 135 350 350 240 350 350 240
90 80 37 90 80 37 95 65 42 95 65 42
50Hz
60Hz
125 100 30 125 100 30 155 90 43 155 90 43
27–28 26–27 21–22 27–28
50Hz
60Hz
28 26 21 28 26.5 21.5 33 30 22 33 30 23
75 75 77 ——— 75 75 77 ———
50Hz
60Hz
75 75 78 ——— 75 75 79 ———
High Low
Extra
High Low
26.5–27.5 21.5–22.5
Extra
31–32 29–30 25–26 31–32 30–31 26–27
High Low
0.56–0.57 0.61–0.63
Extra
0.57–0.6
High Low
0.54–0.56
(%)
In heating
In cooling
Enthalpy
exchange
rate
Frame
Motor
Sirocco fan
Heat exchanger
Filter
Adapter
Mounting pipe diam. (m m )
External dimension
(Length x Width x Height)
Product mass (kg)
Shape
Dimension
(Length x Width x Height)
Mass (kg)
Package
No. of stacked boxes
70 70 73 ——— 69 69 71 ———
50Hz
70 70 75 ——— 69 69 73 ———
60Hz
50Hz
63 63 66 ——— 66 66 69 ———
63 63 68 ——— 66 66 71 ———
60Hz
Zinc iron plate
4-pole capacitor dielectric motor (E type)
ABS resin
Combustion-proof sheet
Nonwoven fabric (Collection effect weighing method 82%)
ABS resin
Ø150
(mm)
(mm)
599 x 882 x 270 804 x 882 x 270
29 37
Corrugated board package/ventilator
335 x 1138 x 795 335 x 1138 x 1000
34 42
4
Accessory
• Installation Manual: 1, • Owner’s Manual: 1
– 8 –
<VN-500SE, VN-800SE>
Model
Type
Ventilation system
Rating
Current (A)
Power consumption (W)
Air volume (m³/H)
Static pressure (pa)
Characteristics
Noise (dB)
Temp. exchange rate (%)
VN-500SE VN-800SE
Concealed duct type
Heat exchange Normal ventilation Heat exchange Normal ventilation
50Hz 220 – 240V, 60Hz 220V
Extra
high high high high
0.86–0.9 0.79–0.81 0.72–0.73 0.84–0.88 0.76–0.77 0.71–0.73 1.51–1.54 1.48–1.5 1.44–1.46 1.47–1.5 1.45–1.48 1.41–1.43
50Hz
60Hz
1.14 1.0 0.81 1.12 0.96 0.8 2.05 1.92 1.68 2.04 1.87 1.68
188–214 169–188 151–166 184–210 161–182 145–164 316–347 309–329 302–327 309–337 300–325 297–316
50Hz
60Hz
244 202 162 243 196 161 424 391 347 417 387 346
500 500 370 500 500 370 800 800 650 800 800 650
50Hz
60Hz
500 500 310 500 500 310 800 800 575 800 800 575
105 70 38 105 70 38 140 110 70 140 110 70
50Hz
60Hz
165 85 33 165 85 33 190 100 50 190 100 50
33–34 31–32 25–26 34–35 32–33 26.5–27.5 38–39 36.5–37.5 32–34 38.5–39.5 37–38 33–35
50Hz
60Hz
35 31 23 36 33 24 39 36 31 39.5 37 31
75 75 77 ——— 75 75 76 ———
50Hz
60Hz
75 75 79 ——— 75 75 77 ———
High Low
Extra
High Low
Extra
High Low
Extra
High Low
(%)
In heating
In cooling
Enthalpy
exchange
rate
Frame
Motor
Sirocco fan
Heat exchanger
Filter
Adapter
Construction
Mounting pipe diam. (m m )
External dimension
(Length x Width x Height)
Product mass (kg)
Shape
Dimension
(Length x Width x Height)
Mass (kg)
Package
No. of stacked boxes
67 67 71 ——— 71 71 74 ———
50Hz
67 67 74 ——— 71 71 75 ———
60Hz
50Hz
62 62 67 ——— 65 65 68 ———
62 62 69 ——— 65 65 69 ———
60Hz
Zinc iron plate
4-pole capacitor dielectric motor (E type)
ABS resin
Combustion-proof sheet
Nonwoven fabric (Collection effect weighing method 82%)
Zinc iron plate
Ø200 Ø250
(mm)
(mm)
904 x 962 x 270 884 x 1322 x 388
43 71
Corrugated board package/ventilator
335 x 1218 x 1100 453 x 1538 x 1075
48 79
43
Accessory
• Installation Manual: 1, • Owner’s Manual: 1
– 9 –
<VN-1KSAE>
Model
Type
Ventilation system
Rating
Current (A)
Power consumption (W )
Air volume (m²/H)
Static pressure (pa)
Noise (dB)
Characteristics
Temp. exchange rate (%)
Enthalpy exchange rate
Frame
Motor
Sirocco fan
Heat exchanger
(%)
In heating
In cooling
VN-1KSAE
Concealed duct type
Heat exchange Normal ventilation
50Hz 220 – 240V
Extra high High Low Extra high High Low
1.97–2.04 1.85–1.93 1.68–1.76 1.95–2.03 1.84–1.92 1.67–1.74
399–445 360–399 332–367 392–438 358–392 329–362
1000 1000 810 1000 1000 810
90 55 35 90 55 35
37.5–38.5 36–37 31–33 38–39 36.5–37.5 31.5–33.5
75 75 76 ———
71 71 73 ———
65 65 68 ———
Zinc iron plate
4-pole capacitor dielectric motor (E type)
ABS resin
Combustion-proof sheet
Filter
Adapter
Construction
Mounting pipe diam. (m m )
External dimension
(Length x Width x Height)
Product mass (kg)
Shape
Dimension
(Length x Width x Height)
Mass (kg)
Package
No. of stacked boxes
Accessory
(mm)
(mm)
Nonwoven fabric (Collection effect weighing method 82%)
Zinc iron plate
Ø250
1134 x 1322 x 388
83
Corrugated board package/ventilator
453 x 1538 x 1325
91
3
• Installation Manual: 1, • Owner’s Manual: 1
– 10 –
5. NAME AND DIMENSION OF EACH PARTS
<VN-250SE, VN-350SE, VN-500SE>
2
5
EA
(Exhaust Air)
A
IHJ
OA
(Outside Air)
CC
4
6
E
1
11
B
8
7
12
3
Model
VN-250SE
VN-350SE
VN-500SE
9
10
RA
(Room Air)
FG
SA
(Supply Air)
4-13 x 30
Oval Hole
Applicable Duct
P
N
Model
VN-250SE
VN-350SE
VN-500SE
Number
1
2
3
4
5
6
7
8
9
10
11
K
L
M
12
Note) Model VN-250SE has one Heat Exchange.
Nominal Diameter
Ø150
Ø200
Name
Frame
Adapter
Terminal
Inspection Cover
Fan Sirocco
Motor Fan
Heat Exchanger
Filter
Damper
Motor Damper
Ceiling Suspension Fixture
Electric Parts Lid
Quantity
1
4
1
1
2
2
2
2
1
1
4
1
Note
Note)
Unit: mm
PNMLKJIHGFECBA
Ø164Ø1442701591351423151421965581095882 599
Ø164Ø1442701591351624801621986081095882804
Ø210Ø194 7015913520250020219960890107962904
<VN-800SE, VN-1KSAE>
6
5
1
7
B
J
3
HIH
A
C
Model
VN-800SE
VN-1KSAE
EA
(Exhaust Air)
OA
(Outside Air)
11
2
4
E
4-13 x 30, Oval Hole
8
P
N
C
12
9
10
(Room Air)
(Supply Air)
Applicable Duct
M+2
VN-1KSAE
RA
FGG
SA
Model
VN-800SE
Number
1
2
3
4
5
6
7
8
9
K
L
M
10
11
12
Note) Model VN-1KSAE has one Heat Exchange.
Nominal Diameter
Ø250
Name
Frame
Adapter
Terminal
Inspection Cover
Fan Sirocco
Motor Fan
Heat Exchanger
Filter
Damper
Motor Damper
Ceiling Suspension Fixture
Electric Parts Lid
Quantity
1
4
1
1
2
2
3
2
1
1
4
1
Note
Note)
Unit: mm
PNMLKJIHGFECBA
Ø258Ø24538821819461242822819 9401250851322 884
Ø258Ø24238821819461267822819119012508513221134
– 11 –
6. WIRING DIAGRAM
<VN-250SE, VN-350SE,
VN-500SE>
Power Source
Divide the power lines running
to the switch and the main unit.
On the product. do not attach
more then one cable to each
terminal.
(1)
Switch
(To be procured
locally)
(2)
(3)
(4)
(5)
(6)
Operation Switch
(1) 0 (OFF)
(2) 1 (ON)
Air Flow Switch
(3) High
(4) Low
Function Select Switch
(5) Heat Exchange
Ventilation
(6) Normal Ventilation
To find out the function
of each switch.
CN–
SAFM
(LINE)
(NEUTRAL)
Red
Supply
Air Fan
Yellow
Blue
Low
High
1234567 12345678
1 2 3 4 5 6 7
Orange
Whte
Extra
High
Capacitor
Black
Common
Yellow
Low
CN–
EAFM
3
1
CN8 CN6 CN5CN7
NC
NO
RY5 RY2
CM
TM1
1
L
2
N
3
COMMON
4
LOW
5
HIGH
6
DAMPER
7
(Srcond main body)
TM1
1
L
Power Source
Third main body
N
LOW
HIGH
DAMPER
2
3
4
5
6
7
Exhaust
Air Fan
Blue
High
NO
CM
Damper
Red
Orange
Capacitor
Motor
MS
Whte
Extra
Black
High
4
1
NO
NC
CM
Common
RY3
Blue
12345
1234 51 2 3 4 5 6 78
RY4
Yellow
(Heat Exchange)
NC
NO
CM
White
(Normal)
RY5
Black
CN–DM
RY4
RY3
Model Power Source
VN-250SE
VN-350SE
220-240V~50Hz/
220V~60Hz
VN-500SE
RY2
Model Capacitor
VN-250SE 2.0µF 450VAC
VN-350SE 3.0µF 450VAC
VN-500SE 3.5µF 450VAC
<VN-800SE, VN-1KSAE>
Power Source
Divide the power lines running
to the switch and the main unit.
On the product. do not attach
more then one cable to each
terminal.
Operation Switch
(1) 0 (OFF)
(2) 1 (ON)
Air Flow Switch
(3) High
(4) Low
Function Select Switch
(5) Heat Exchange
Ventilation
(6) Normal Ventilation
To find out the function
of each switch.
(NEUTRAL)
(1)
(2)
(3)
(4)
(5)
(6)
Switch
(To be procured
locally)
CN–
SAFM
(LINE)
Third main body
Red
Supply
Air Fan
Orange
Yellow
Blue
Low
High
Whte
Extra
High
1234567 12345678
1 2 3 4 5 6 7
3
1
CN8 CN6 CN5CN7
NC
NO
RY5
CM
L
N
COMMON
LOW
HIGH
DAMPER
(Srcond main body)
Power Source
L
N
COMMON
LOW
HIGH
DAMPER
Capacitor
Black
Common
1
2
3
4
5
6
7
1
4
6
Yellow
Low
CN–
EAFM
RY2
TM1
2
3
5
7
TM1
Exhaust
Air Fan
Blue
High
NO
CM
4
1
NC
Red
Orange
Whte
Extra
High
Damper
Capacitor
Motor
MS
Black
Common
Blue
12345
1234 51 2 3 4 5 6 78
RY4
Yellow
(Heat Exchange)
NC
NO
CM
White
(Normal)
Black
CN–DM
RY4
NO
RY3
CM
NC
NO
RY1
CM
RY1
RY5
RY3
Model Power Source
VN-800SE
VN-1KSAE
220-240V~50Hz/
220V~60Hz
220-240V~50Hz/
RY2
Model Capacitor
VN-800SE 8.0µF 450VAC
VN-1KSAE 10.0µF 450VAC
– 12 –
7. OWNER’S MANUAL (EXTRACT)
7-1. Specific Caution Items
7-1-1. Checking Location of Installation
This Energy Recovery Ventilators have been designed especially for use in offices, conference rooms, etc.
Please check to ensure that neither the main unit nor the inlet-outlet grill are installed in any of the following locations.
Locations exposed to high temperatures or direct flame.
Avoid installing the Heat Exchange
Ventilators or the inlet-outlet grill in
locations which reach temperatures
of 40°C or above.
Usage under high temperature
conditions may cause distortion of
the filter or Heat Exchanger or
motor burn-out.
40˚C
Make sure that access is provided so that filter and Heat
Exchanger maintenance and periodic spot checks of
the unit can be easily carried out.
(Refer to the Model Installation for its space)
Locations with high humidity.
Do not install in high humidity
locations such as bathrooms.
Doing so may cause a breakdown
of the unit or an electric shock.
Locations with large amounts of oily
smoke, such as food preparation
areas.
The unit will become inoperable if
the filter or Heat Exchanger
become clogged with oil.
Interior Intake Vent
Oily
smoke
Do not install the unit in locations such as machinery or
chemical plants where it will be exposed to noxious
gases containing acids, alkali, organic solvents, paint
fumes, etc., to gases containing corrosive ingredients,
or where dust or oil mist will be produced.
If there are any problems concerning the location or installation of the unit, please consult either store from which it
was purchased or the agent who installed it.
7-1-2. When Using
Always be sure to use a filter.
Failure to do so may cause dust and dirt to build up on
the heat exchange element, lowering its efficiency and
rendering it inoperable.
Operate the switch with certainty.
In particular, suddenly turning the switch on and off will
not only cause improper operation of the unit, but will
also obversely affect the relay inside the switch, and
may damage it.
– 13 –
7-2. Model Installation
Outside Intake Duct
Pipe Hood
Supply Air Duct
Ceiling Suspension Bolt
Note that when installing a unit body
upside down, its printed indication is
in a reversed position.
7-2-1. Method of Use
• Use the operation switch to operate the unit.
0 (OFF) ..............the unit stop.
OA
(Outside Air)
(Exhaust Air)
Heat Insulation
Material
Pipe Hood
Room Intake Duct
EA
Room Intake Opening
(Supply/Exhaust Air Grill)
Exhaust Air Duct
RA
(Outside Air)
Inside Supply Opening
(Supply/Exhaust Air Grill)
1 (ON) ................the unit operates.
• Use the Air Flow switch to set to the desired air flow.
High ...................Turns to high air volume.
Low....................Turns to low air volume.
• Use the Function Select switch to set the ventilation mode.
Heat Exchange Ventilation Mode .....Open air is thermal-exchange with room air to bring it closer to a room
temperature and humidity, before taking it in the room.
Normal V entilation Mode ..................T o intake open air as it is.
SA
(Supply Air)
7-3. Maintenance Method
In order to prevent the reduced effectiveness of your Heat Exchange Ventilators, be sure to clean dirt and dust from the
filter and Heat Exchanger at regular intervals.
CAUTION
Be sure to turn the power off, and to
keep the exclusive breaker off
before carrying out maintenance
activities.
Switch
Turn off
Do not use the following items for
cleaning.
Gasoline
Thinner
Benzene
Do not immerse the filter or other
resin components in water 60°C or
above.
Water 60
or above
˚C
Avoid using heat to dry the filter, as
it may cause changes in shape or
quality.
Filter
Never use water on the motor, the
switch, or the Heat Exchanger.
Motor
Switch
Heat
Exchange
Element
Always be sure to use a filter.
Failure to do so may cause dust
and dirt to build up on the Heat
Exchanger, lowering its efficiency
and rendering it inoperable.
Metal brush
– 14 –
7-4. Maintenance Method
7-4-1. Model VN-250SE/VN-350SE/VN-500SE
• Stop the operation and keep the exclusive breaker “OFF”.
• Cleaning the filter (When required)
1) Enter the ceiling from the Inspection Opening for the Heat
Exchange Ventilators, and remove the screw on the inspection
cover.
2) Holding the Inspection Cover, turn two pieces of knob for 90°
and remove the cover.
3) There is a filter below the Heat Exchanger at two places,
respectively. Pull it toward you.
4) Either lightly strike the removed filter with your hand or
vacuum it with a vacuum cleaner to remo ve the dirt.
If it is very dirty, swish it back and forth in a solution of
lukewarm water and dish-washing (neutral) detergent.
5) Install the filter after thoroughly allowing it to dry naturally.
CAUTION
Avoid using heat to dry the filter, as this may cause changes in
the shape or quality of the filter.
Knob Position
Hook
Hook
Inspection
Cover
Inspection
Cover
• Whenever the filter was damaged, order the sales shop or the
engineering office. (Separately sold)
• Cleaning the Heat Exchanger.
(If you find it too much stained, clean it.)
1) Remove the filters.
2) Remove the two Heat Exchanger from the unit.
(Model VN-250SE has one Heat Exchange .)
CAUTION
• The weight of the Heat Exchanger is as shown in the table
below .
Hold it firmly to ensure that you do not drop it.
Model
VN-250SE
VN-350SE
VN-500SE
Weight (kg/piece)
4.5
3.4
3.7
Pieces to be used
1
2
2
When installed
(Closed)
Heat Exchanger
Filter
To remove
(Open)
– 15 –
3) Use a vacuum cleaner to remove dust and dirt from the
element’s surface.
CAUTION
• Use a brush attachment on the vacuum cleaner nozzle.
Clean with a light, brushing action.
Avoid using a hard nozzle as it may disfigure the heat ex-
change foils.
• Never use water to clean the Heat Exchanger.
• Whenever the Heat Exchanger was damaged, order the sales
shop or the engineering office. (Separately sold)
4) When cleaning is completed, return the Heat Exchanger and
filter to their former positions, and close the Inspection cover
and tighten the screw.
CAUTION
• Make absolutely sure to install the filter with an indication of
“ ” turned to wart the Heat Exchanger side.
Failure to do so will lead to clogging of the Heat Exchanger
foils and reduced performance.
• Insert the heat exchanger right side up, with the label marked
facing toward you.
ñ
Nozzle
Mark
– 16 –
7-4-2. Model VN-800SE/VN-1KSAE
Heat Exchanger
Grooved Rail
When installed
(Closed)
To remove
(Open)
Filter
Hook
Inspection Cover
Hook
Inspection Cover
Knob Position
• Stop the operation and keep the exclusive breaker "OFF".
• Cleaning the filter (When required)
1) Enter the ceiling from the Inspection Opening for the
Heat Exchange Ventilators, and remove the screw on
the inspection cover.
2) Holding the Inspection Cover, turn two pieces of knob
for 90° and remov e the cover.
3) There is a filter at two places, respectively.
Pull it toward you.
4) Either lightly strike the removed filter with your hand or
vacuum it with a vacuum cleaner to remo ve the dirt.
If it is very dirty, swish it back and forth in a solution of
lukewarm water and dish-washing (neutral) detergent.
5) Install the filter after thoroughly allowing it to dry natu-
rally. (Install them to fit well with the grooved rail)
CAUTION
Avoid using heat to dry the filter, as this may cause
changes in the shape or quality of the filter.
• Whenever the filter was damaged, order the sales shop
or the engineering office. (Separately sold)
• Cleaning the Heat Exchanger.
(If you find it too much stained, clean it.)
1) Remove the four Heat Exchanger from the unit.
(Model VN-800SE has three Heat Exchange.)
CAUTION
• The weight of the Heat Exchanger is as shown in the
table below.
Hold it firmly to ensure that you do not drop it.
Model
VN-800SE
VN-1KSAE
Weight (kg/piece)
4.0
4.0
Pieces to be used
3
4
– 17 –
2) Use a vacuum cleaner to remove dust and dirt from the
element's surface.
CAUTION
• Use a brush attachment on the vacuum cleaner nozzle.
Clean with a light, brushing action.
Avoid using a hard nozzle as it may disfigure the heat ex-
change foils.
• Never use water to clean the Heat Exchanger.
• Whenever the Heat Exchanger was damaged, order the sales
shop or the engineering office. (Separately sold)
3) When cleaning is completed, return the Heat Exchanger and
filter to their former positions, and close the Inspection cover
and tighten the screw.
CAUTION
• Make absolutely sure to install the filter with an indication of
“ ” turned toward the Heat Exchanger side.
Failure to do so will lead to clogging of the Heat Exchanger
foils and reduced performance.
• Please insert so that the stamp “ ” to be toward you.
Nozzle
Stamp
7-5. After-sales Service
• Request for Spot Checks
To ensure safe, correct usage, we suggest that you consider a maintenance contract.
For details, inquire at the store where you bought your unit, or at the agent which installed it.
• If You Think It’s Broken
Examine the unit as shown in the table below, and if you find any irregularities, shut it off immediately and
contact the store where you bought your unit or the agent who installed it to request servicing (or consultation).
Symptom
• No activity, even when
the switch is on.
• No air comes out.
• Is the fuse blown or the breaker tripped?
• Is the power out?
• Check whether or not there is dust on the filters and the Heat Exchanger.
(Clean it according to the Maintenance Method mentioned.)
Where to look
– 18 –
8. INSTALLATION MANUAL (EXTRACT)
8-1. Cautions for Operation
Never fail to make the inspection opening at the specific place on the ceiling so you can perform the constant cleaning or the equipment checking of filter and Heat Exchanger .
• The inspection opening shown below is necessary to clean the Heat Exchanger and the filter as required. If not cleaned, they are likely to get clogged, resulting in degradation of performance.
RA
(Room Air)
EA (Exhaust Air)
Heat Exchanger
A
Unit Body
SA
(Supply Air)
OA (Outside Air)
600
Maintenance Space
Inspection Opening : 450 Inspection Opening : 450
(For the inspection of Filters,
Heat Exchanger, Fans,
Motors and Damper.)
Heat Exchanger
RA
(Room Air)
EA (Exhaust Air)
Unit Body
SA
(Supply Air)
OA (Outside Air)
600A
Maintenance Space
(For the inspection of Filters,
Heat Exchanger, Fans,
Motors and Damper.)
Note) Model VN-250SE has one Heat Exchange. Note) Model VN-1KSAE has four Heat Exchange.
Unit : mm Unit : mm
Model
VN-250SE
VN-350SE
VN-500SE
A
599
804
904
Model
VN-800SE
VN-1KSAE
A
884
1134
• This Energy Recovery Ventilators should be installed at the place where a larger space than the sizes
shown below can be secured for the ceiling space.
• Don't install it near the water-heater.
• Refrain from the following duct installing works.
(1) Excessive bending
20
A
(2) Multi-times bending
Model
VN-250SE
VN-350SE
VN-500SE
– 19 –
Ceiling Space A
320
(3) Making the connecting duct smaller
Model
VN-800SE
VN-1KSAE
Unit : mm
Ceiling Space A
440
• Do not use in bathrooms or food preparation areas etc.
If you use the unit at the place of much soot and high humidity, the filter or the Heat Exchanger gets clogged
and disables you to use it.
• Use the Heat Exchange V entilator s in the ambient temperature of 40°C or less.
Never install the unit at the place where the flame likely reaches directly the unit. If you use it at the atmosphere of
more than 40°C for hours , it is likely to cause deterior ation or def ormation or damage of the resin part.
• Be careful of dewing and frosting.
As shown in the figure to the right, suppose a high temp. absorbing air condition A and a low temp absorbing air condition B are plotted on the air line
figure, then a high temp air A is heat-exchanged by the unit and goes out of
the saturation curve as shown by Point C. In this case, the unit will be dewed
or frosted. To avoid this, y ou are required to heat a low temp air B up to B' so
as to get C' below the saturation curve, before using the unit.
B
Saturation
curve
C
C'
B'
Dry-bulb temperature (˚C)
8-2. Local Procurements
• Switches are to be locally procured.
We recommend that you use a switch having more than 3mm distance to break contact and more than 15A
rated current.
A
Absolute humidity (kg/kg’)
8-3. Reference Sketch
Pipe Hood
(Outside Air)
OA
Outside Intake Duct
EA
(Exhaust Air)
Heat Insulation
Material
Pipe Hood
Ceiling Suspension Bolt
Room Intake Duct
Room Intake Opening
(Supply/Exhaust Air Grill)
Exhaust Air Duct
Supply Air Duct
RA
(Outside Air)
Inside Supply Opening
(Supply/Exhaust Air Grill)
Use conditions
Outdoor air conditions : Temperature range –10°C~40°C, relativ e humidity 85% or less
Indoor air conditions : Temperature range –10°C~40°C , relativ e humidity 85% or less
Installation requirements: Same as the indoor air conditions
• Indoor air here means air in air-conditioned living rooms. Its use in refrigerators or other places where
temperature can fluctuate greatly is prohibited even if a temperature range is acceptable.
SA
(Supply Air)
Example: Indoor air conditions
During cooling period : Temperature 27°C, relative humidity 50%
During heating period : Temperature 20°C, relativ e humidity 40%
– 20 –
8-3. Installation Method
8-3-1. Model Installation
• You are required to prepare the ceiling suspension bolts, nuts and washers .
• Install the unit firmly and horizontally enough to support its weight. (Fig. 1)
• If you do not fit it firmly, it is not only dangerous but also easily vibrated.
If it is not fitted horizontally, the damper unit becomes defective in operation.
CAUTION
• When you are required to be cautious on prevention of vibration,
we recommend you to use the anti-vibration ceiling suspension
fixtures.
• Never fail to make an inspection opening with 450 mm or more at
the place shown on the paragraph of “Cautions For Operation”, so
that you can inspect filters, Heat Exchanger, power source and
motors.
Ceiling Suspension Bolt
(Ø10 to Ø12)
Fig. 1
Nut
Washer
Ceiling Suspension
Fixture Washer
Nut
8-3-2. Cautions on Installing The Unit Body Upside Down
• Re-fit the ceiling suspension fixture in an opposite side. (If they are left as it is, the foolproof function of ceiling
suspension bolts do not work and will cause the danger of dropping of the unit.)
• Printed indication is in a reversed position.
In particular, be careful of the arrow mark [ ñ ] showing the direction of inserting a Heat Exchange.
8-4. Electric W orks
Have a specialized working contractor perform wiring in accordance with the laws and regulations of the country
concerned.
• Connect the broken lines in the wiring diagram.
• We recommend that you use a switch having more than 3 mm distance to break contact and more than 15A
rated current.
Damper
RY3
MS
Blue
12345
1234 51 2 3 4 5 6 78
RY4
Motor
Yellow
(Heat Exchange)
NC
NO
CM
White
(Normal)
RY5
RY2
Black
CN–DM
RY4
RY3
Model Power Source
VN-250SE
VN-350SE
VN-500SE
Model Capacitor
VN-250SE 2.0µF 450VAC
VN-350SE 3.0µF 450VAC
VN-500SE 3.5µF 450VAC
220-240V~50Hz/
220V~60Hz
Divide the power lines running
to the switch and the main unit.
On the product. do not attach
more then one cable to each
terminal.
Operation Switch
(1) 0 (OFF)
(2) 1 (ON)
Air Flow Switch
(3) High
(4) Low
Function Select Switch
(5) Heat Exchange
Ventilation
(6) Normal Ventilation
To find out the function
of each switch.
Power Source
(NEUTRAL)
(1)
(2)
(3)
(4)
(5)
(6)
Switch
(To be procured
locally)
Red
Supply
Air Fan
Orange
Yellow
Blue
Low
High
Whte
Extra
Black
High
3
1
NC
NO
CM
L
N
COMMON
LOW
HIGH
DAMPER
(Srcond main body)
L
N
LOW
HIGH
DAMPER
Common
1234567 12345678
CN–
1 2 3 4 5 6 7
SAFM
(LINE)
CN8 CN6 CN5CN7
RY5 RY2
Power Source
Third main body
Capacitor
CN–
EAFM
1
2
3
4
5
6
7
1
2
3
4
5
6
7
Yellow
Low
TM1
TM1
Exhaust
Blue
High
NO
CM
Air Fan
Red
Orange
Whte
Extra
High
4
1
NO
NC
CM
– 21 –
Capacitor
Black
Common
Divide the power lines running
to the switch and the main unit.
On the product. do not attach
more then one cable to each
terminal.
Operation Switch
(1) 0 (OFF)
(2) 1 (ON)
Air Flow Switch
(3) High
(4) Low
Function Select Switch
(5) Heat Exchange
Ventilation
(6) Normal Ventilation
To find out the function
of each switch.
Power Source
(LINE)
(NEUTRAL)
(1)
(2)
(3)
(4)
(5)
(6)
Switch
(To be procured
locally)
Red
Supply
Capacitor
Air Fan
Orange
Yellow
Blue
Low
High
Whte
Extra
Black
High
1234567 12345678
CN–
1 2 3 4 5 6 7
SAFM
CN8 CN6 CN5CN7
RY5
Power Source
Third main body
Common
3
1
NC
NO
CM
1
L
2
N
3
COMMON
4
LOW
5
HIGH
6
DAMPER
7
(Srcond main body)
L
N
COMMON
LOW
HIGH
DAMPER
CN–
EAFM
TM1
1
2
3
4
5
6
7
Yellow
Low
RY2
TM1
Exhaust
Air Fan
Blue
High
NO
CM
Damper
Capacitor
Black
Common
NC
RY1
RY3
MS
Blue
12345
1234 51 2 3 4 5 6 78
RY4
Motor
Yellow
(Heat Exchange)
NC
CM
Black
White
(Normal)
CN–DM
NO
RY4
RY3
RY1
RY5
RY2
Model Power Source
VN-800SE
VN-1KSAE
Model Capacitor
VN-800SE 8.0µF 450VAC
VN-1KSAE 10.0µF 450VAC
220-240V~50Hz/
220V~60Hz
220-240V~50Hz
Red
Orange
Whte
Extra
High
4
1
NO
NC
CM
NO
CM
• Use the polyvinyl chloride insulated and sheathed cables for fixed wiring having
1.6 mm to 2.0 mm in diameter or 2.0 mm² to 3.1 mm² in conformity with IEC 60227-4.
Ring
terminal
(Carry out the work based on the laws, regulations and technical standards of the
country concerned.)
Secure wire
• Follow the following steps for wiring.
• Unfasten two cover-fixing screws of the electrical equipment box,
open the box cover, and then connect wiring firmly.
properly
Stranded
wire
• Fit the cables from the terminal firmly with a cord clamber.
• When you need much airflow or a duct is long, change the wire connection from High to Extra High.
• Unfasten two cover-fixing screws of the electrical equipment box and open the box cover.
• Change CN6 to CN5 and CN8 to CN7 inside the Electric Parts Lid.
• It is possible to operate up to 10 units from one switch set.
Switching Connector
(CN8) (CN8) (CN8) (CN8)
Cover-fixing screws of the
Electric Parts Lid
Electric Parts Lid
CAUTION
• Use the power source corresponding to the name plate. Using a different power source may cause the
motor to burn out.
• Carry out grounding work according to the laws and regulations of the country concerned and the technical
standard.
• After completion of wiring, check again there are no wrong wirings before power ON.
– 22 –
8-5. Duct Installation
• Wind the junction of an adaptor and a duct with an aluminum tape firmly to prevent any air leakage.
• The room intake opening should be positioned as far as possible from the inside supply opening.
• Use the specified ducts. (See the Name and Dimension of Each Part.)
• Install two outdoor ducts so they will be in the down gradient toward outside to prevent water from coming in.
(Gradient: 1/100~1/50) (Fig. 2)
• Never fail to heat-insulate two outdoor ducts (including outside air and exhaust air duct) to prevent dewing.
(Material: Glass Wool, Thickness-25mm) (Fig. 2)
• When you want to pierce the metal duct through the metal lath or the wire lath or the metal plate of the wooden
facility, do not forget to insulate electrically between the duct and the wall.
(Refer to the laws and regulations of the country concerned and the technical standard.)
Heat Insulation Material (Insulate the Adapter and Aluminum Tape.)
Outside Intake Duct, Exhaust Air Duct
Gradient
(1/100 ~ 1/50)
Aluminum Tape Aluminum Tape
Fig. 2
8-6. Pilot Running
• On completion of installing works, never fail to check wirings and perform a pilot running.
• After completion of wiring, power ON and perform a pilot run according to the following steps for checking a
airflow condition and a damper operation.
• Check the opening and closing of a damper by opening the inspection cover of the side of the unit.
• Model VN-800SE, VN-1KSAE, two Fan Motors are stopped during an operation of the damper .
Each switch setting
Function Select Switch Air Flow Switch
1
2
Heat Exchange
Normal Ventilation
High (Extra High)
High (Extra High)
Low
Low
Airflow condition
Check if the air from inside
supply opening and the one
from room intake opening are
set to High (Extra High) and to
Low, respectively
Checking items
Damper
Open
(A Damper is beyond)
Close
(A Damper is near)
• In case that any abnormality occurs in a pilot running, its conceivable cause would be a wrong wiring.
Don’t lose time to switch the exclusive breaker to OFF and re-wire correctly.
Otherwise, it is likely to cause an electric shock.
– 23 –
9. HO W T O DIAGNOSE THE TROUBLE
<VN-250SE, VN-350SE, VN-500SE, VN-800SE, VN-1KSAE>
Phenomenon
Motor fan does not
revolve.
Abnormal sound is heard
from inside the main unit.
Check point
• Wall switch
• Lead wire
• Connecting section
• Motor fan
• Turning section of fan
sirocco
• Capacitor
• Relay
• Power supply
• Terminal block of wall
(Assembly of electric
parts stool)
• Motor fan
Cause
Connection failure, Incorrect connection
Wire disconnection
Contact failure
Motor revolution section
(Bearing) is locked.
Motor winding or temp. fuse
is disconnected.
Turning section of fan
sirocco is locked.
Capacitor trouble
Relay trouble
Abnormal power is applied.
Miswiring
Electromagnetic sound
(Buzzing of motor)
Measures
• Replace wall switch. Correct
connection.
• Replace motor fan.
• Connect surely. (Assembly of
electric parts stool, Fan)
• Replace motor fan.
• Remove locked part.
• Replace capacitor.
• Replace relay.
• Check power supply.
• Re-wire according to the
wiring diagram.
• Replace motor fan.
Motor fan revolution is
weak.
Damper does not open/
close.
• Fan sirocco
• Screws of each part of
main unit
• Filter
• Heat exchanger
• Capacitor
• Wall switch
• Lead wire
• Motor damper
• Damper
• Connector assembly
Bearing failure
Incomplete attachment of
fan sirocco
Suction of foreign matter
Deformed fan sirocco
Loosening of screw
(Resonance due to incomplete tightening)
Clogging of filter
Clogging of heat exchanger
Capacitor failure
Contact failure
Contact failure
Winding of motor damper is
disconnected.
Catching at sliding section
Contact failure
• Attach fan sirocco firmly.
• Remove foreign matter.
• Replace fan sirocco.
• Tighten screw firmly.
• Clean filter.
• Clean heat exchanger
• Replace capacitor.
• Ensure contact.
• Ensure contact.
• Replace motor damper.
• Correct catching.
• Replace connector assembly.
– 24 –
10. HOW TO REPLACE THE MAIN PARTS
Turn off the power supply.
Prohibition of modification.
Use appropriate repair parts.
WARNING
• Be sure to turn off the power supply of distribution panel, power board,
and etc. before the work when power-ON is unnecessary such as a case of
disassembling.
Otherwise an electric shock may be caused even if the wall switch is turned off
because it is a single cut switch.
• Do not modify the product.
Also do not use the disassembled, modified or repaired parts.
Otherwise it causes a fire, electric shock or injury.
• Use the substitute parts corresponded to the model for repair .
It causes an abnormal operation or a trouble resulting in leakage or fire, that is a
cause of customers’ disaster.
Use gloves.
CAUTION
• Use the protective materials such as gloves, etc. for check/repair inside the
unit.
If touching inside the unit with bare hands, an injury may be caused.
– 25 –
Position/Part Replace/Assembly procedure Description
WARNING
• Be sure to turn off the power supply of distribution panel, power
board, and etc. before the work when power-ON is unnecessary
Turn off
the power
supply.
such as a case of disassembling.
Otherwise an electric shock may be caused even if the wall switch is
turned off because it is a single cut switch.
• Filter 1), 2)
• Heat exchanger 1),
3)
• Fan sirocco 1) to 8)
• Motor fan 1) to 9)
• Damper
1), 2), 3),10), 11)
• Capacitor
12), 13), 14), 15)
• P.C. board assembly
(including terminal
block and relay)
12) to 16)
1) Remove the screw, turn the lock
knob by 90°, and then remove the lid
maintenance.
2) Remove the filter.
3) Remove the Heat Exchanger.
The weight of the heat
exchanger is 3 to 7kg.
Hold the Heat Exchanger hard
without dropping it.
4) Remove the screw and the rail.
5) Remove the partition board.
The figure is for VN-250SE. The configuration
differs according to the model.
Lid
maintenance
Screw
Heat
Exchanger
Screw
Partition
board
Lock
knob
Filter
6) Remove the connector.
7) Remove the screw fixing the fan unit.
8) Remove the nut and the fan sirocco.
Rail
Connector
Fan unit
Screw
Nut
Fan
sirocco
– 26 –
Position/Part Replace/Assembly procedure
9) Remove the screw fixing the motor
fan to remove the motor fan.
Description
Screw
Motor fan
10) Remove the connector of the damper
ass’y.
11) Remove the fixing screw of the
damper ass’y and slide the damper
leftward to remove it.
12) Remove the screw of the lid electric
parts.
Damper
Connector
Limit switch
Screw
Damper ass’y disassembling
Cam
Motor
damper
Screw
13) Open the lid electric parts.
14) Remove FASTON terminal connected
to the capacitor.
15) Remove the screw to remove the
capacitor.
16) Remove the connector and P.C. board
ass’y.
Perform wiring correctly according to
the wiring diagram.
Mounting
Perform mounting in the reverse procedure of removal.
– 27 –
FASTON
terminal
P.C. board
ass’y
Lid electric
parts
Screw
Capacitor
11. CHECK WHEN REPAIR WORK COMPLETED
Check after repair work
Check after reinstallation
WARNING
• After repair work, check whether there is a trouble or not referring to the
check points.
If the check is not performed, a fire, an electric shock or an injury occurs.
Before check, turn off the power supply of the distribution panel and power
board.
• After repair work, perform a test run to check whether there is smoke/
abnormal sound or not.
If the check is not performed, a fire, an electric shock or an injury occurs.
• After reinstallation, check the following items.
• The earth wire is correctly connected.
• The power supply cord is not pinched in the product.
• The installation is stable without inclination or wavering.
If the check is not performed, a fire, an electric shock or an injury occurs.
[Check Point]
When the product was repaired (replacement of parts, etc.), be sure to perform a test run and check there is no
trouble on the following items.
Item
(1) Insulation resistance
(2) Parts specified to
safety
(3) Process on lead
wire
(4) Tightening of screws
(5) Removal of foreign
matters in the unit
Check/Judgment
When measuring the insulation resistance between the common
pin of the terminal and the metal section of the main unit under
condition that the power supply cord is not connected, the insulation resistance keeps 10MΩ or more.
Especially check the following cases sufficiently.
• When the electric parts were replaced.
• Articles used at place with high humidity.
• Products used for 5 years or more.
If a part other than specified part is used, replace it with the
specified one.
Check whether there is slack or excessive tension of the lead wire
or not. Check the lead wire is connected firmly and the binding
process is surely performed.
Check the screws are surely tightened.
Check whether soldering chip, wire wastes, screws, and etc. are
remained or not in the unit.
And check there is no accumulation of dust in the unit.
Measuring device/
Sub-material
DC500V megger
(6) Check power supply
cable.
(7) Check mounting
status.
Check the damage of the terminal block.
Check whether the specified power supply cable is used or not.
Check strength of the product mounting section.
There is no loosening of the mounting nut, etc.
– 28 –
12. Q & A FOR HEAT EXCHANGE VENTILATORS
(Users are responsible for the following contents.)
Question
u Fan does not operate.
u Fan does not ventilate
(suction air).
Answer
•Is the electric wiring securely performed?
For this model, the terminal block for connection of cables is provided
to the side of the main unit. The connecting works between the power
supply and the switch and between the switch and the main unit are
performed by the special dealers. Incorrect cabling from the specified
switch and the switches disables to adjust the air volume. Therefore,
check the cable connection.
Are not the various filters clogged with dust, etc.?
•
Perform cleaning described in Owner’s Manual.
Is not the heat exchanger clogged with dust, etc.?
•
Especially in case that the mounting direction of the product is incorrect (indoor side and outdoor side), dust, etc. is clogged in a short time
because the indoor air and outdoor air do not pass through the filter but
flow directly in the heat exchanger.
SA
indoor side Outdoor (Out air) side
RA
Air flow
OA
EA
u Drop of heat exchange
effect
u Water drops on the
ceiling surface.
u Dew condensation
generates on surface of
the main unit.
Does not generate the dew condensation on the heat exchanger?
•
In the heat exchange, the temperature difference between indoor and
outdoor is widened. Therefore, in the heat exchanger , the de w condensation generates according to some conditions of temperature and humidity, and the dew condensation/freezing generates according to some
conditions of outdoor air . In these cases, the status returns to the original
status when temperature of the outdoor air ascends and thaws. For the
measures, heating of air at low-temperature side is necessary as described in Installation Manual.
Are thermal insulation process applied to 2 duct pipes (Air suction
•
OA and air dischar ge EA) at outdoor side?
Be sure to apply thermal insulation because the temperature difference
between indoor and outdoor is widened and the dew condensation may
generate according to some conditions of temperature and humidity.
Is the product installed horizontally?
•
If the product is slanted, various troubles may be caused.
Is not the ventilator operated with the normal ventilation in the
•
winter season?
If the ventilator is operated with the normal ventilation in the winter
season, the surface of the main unit is cooled with the outdoor air
resulting in dew condensation on the surface.
– 29 –
13. EXPLODED VIEWS AND PARTS LIST
19,18
1,2,10
50
31,32,
33,34,35
51
52,53
11,12
13,14,
15,16,17
20
3,4,5
45,46,
47,48,49
13,14,15,
16,17
26,27,
28,29
30
36
31,32,
33,34,35
6,7,8,9
43,44
42
21,22,
23,24,25
37,38,
39,40,41
1,2,10
18,19
54,55,
56,57,58
– 30 –
Location
No.
Part No. Description
Location
No.
Part No. Description
1 41120433 Fan, Sirocco
(VN-250SE, VN-350SE)
2 41120434 Fan, Sirocco
(VN-800SE, VN-1KSAE)
3 41118431 Adaptor
(VN-250SE, VN-350SE)
4 4118432 Adaptor (VN-500SE)
5 4118448 Adaptor
(VN-800SE, VN-1KSAE)
6 41114829 Heat Exchanger (VN-350SE)
7 41114830 Heat Exchanger (VN-250SE)
8 41114831 Heat Exchanger (VN-500SE)
8 41114840 Heat Exchanger
(VN-800SE, VN-1KSAE)
10 41120445 Fan, Sirocco (VN-500SE)
11 41112485 Lid, Maintenance
(VN-250SE, VN-350SE,
VN-500SE)
12 41112513 Lid, Maintenance
(VN-800SE, VN-1KSAE)
13 41114833 Filter (VN-250SE)
14 41114834 Filter (VN-350SE)
15 41114835 Filter (VN-500SE)
16 41114845 Filter (VN-800SE)
17 41114846 Filter (VN-1KSAE)
18 41118433 Nut, Dome Cap
(VN-250SE, VN-350SE,
VN-500SE)
19 41118451 Nut, Dome Cap
(VN-800SE, VN-1KSAE)
20 41118434 Knob, Lock
21 41171265 Capacitor, 2MFD , 450V
(VN-250SE)
22 41171266 Capacitor, 3MFD , 450V
(VN-350SE)
23 41171267 Capacitor, 3.5MFD , 450V
(VN-500SE)
24 41171268 Capacitor, 8MFD , 450V
(VN-800SE)
25 41171269 Capacitor, 10MFD , 450V
(VN-1KSAE)
26 41118531 Damper Ass’y (VN-250SE)
27 41118532 Damper Ass’y
(VN-350SE, VN-500SE)
28 41118533 Damper Ass’y (VN-800SE)
29 41118534 Damper Ass’y (VN-1KSAE)
30 41179475 Motor, Damper , A C 220–240V
31 41150975 Motor, F an, A C 220–240V,
50/60Hz (VN-250SE)
32 41150976 Motor, F an, A C 220–240V,
50/60Hz (VN-350SE)
33 41150977 Motor, F an, A C 220–240V,
50/60Hz (VN-500SE)
34 41150978 Motor, F an, A C 220–240V,
50/60Hz (VN-800SE)
35 41150979 Motor, F an, A C 220–240V,
50Hz (VN-1KSAE)
36 41170448 Switch, Limit
37 41179476 Wire, Ass’y (VN-250SE)
38 41179477 Wire, Ass’y (VN-350SE)
39 41179478 Wire, Ass’y (VN-500SE)
40 41179479 Wire, Ass’y (VN-800SE)
41 41179480 Wire, Ass’y (VN-1KSAE)
42 41112561 Lid, Electric Parts
43 41170449 P.C. Board Ass’y
(VN-250SE, VN-350SE,
VN-500SE)
44 41170450 P.C. Board Ass’y
(VN-800SE, VN-1KSAE)
45 41116677 Name Plate (VN-250SE)
46 41116678 Name Plate (VN-350SE)
47 41116679 Name Plate (VN-500SE)
48 41116680 Name Plate (VN-800SE)
49 41116681 Name Plate (VN-1KSAE)
50 4118S177 Owner’s Manual
51 4118S178 Installation Manual
52 4118S179 Wiring Diagram
(VN-250SE, VN-350SE,
VN-500SE)
53 4118S180 Wiring Diagram
(VN-800SE, VN-1KSAE)
54 4119B217 Packing (VN-250SE)
55 4119B218 Packing (VN-350SE)
56 4119B219 Packing (VN-500SE)
57 4119B220 Packing (VN-800SE)
58 4119B221 Packing (VN-1KSAE)
– 31 –
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