Fujitsu UTZ-BD035B, UTZ-BD025B, UTZ-BD050B, UTZ-BD100B, UTZ-BD080B Technical Manual

DTO_ERV002E_01

2013.04.26

DESIGN & TECHNICAL MANUAL

UTZ-BD025B

UTZ-BD035B

UTZ-BD050B

UTZ-BD080B

UTZ-BD100B

ENERGY RECOVERY VENTILATORS

CONTENTS

1. SPECIFICATIONS

1-1. SPECIFICATIONS ........................................................................

01-01

2. DIMENTIONS

2-1. UTZ-BD025B ................................................................................

01-03

2-2. UTZ-BD035B ................................................................................

01-05

2-3. UTZ-BD050B ................................................................................

01-07

2-4. UTZ-BD080B ................................................................................

01-09

2-5. UTZ-BD100B .................................................................................

01-11

3. WIRING DIAGRAMS

3-1. UTZ-BD025B ................................................................................

01-13

3-2. UTZ-BD035B, UTZ-BD050B ........................................................

01-13

3-3. UTZ-BD080B, UTZ-BD100B ........................................................

01-14

3-4. INTERLOCKED CONNECTION TO AIR CONDITIONER ............

01-15

4. DESIGN SECTION

4-1. ABOUT HEAT EXCHANGE UNIT ................................................

01-17

4-1-1. BASIC ENGIN .........................................................................................

01-17

4-1-2. INTERNAL STRUCTURE .......................................................................

01-18

4-1-3. HEAT EXCHANGE VENTILATION AND NORMAL VENTILATION .......

01-19

4-2. NEEDS FOR VENTILATION .........................................................

01-20

4-2-1. OBJECTIVES AND EFFECTS OF VENTILATION .................................

01-20

4-3. METHODS OF VENTILATION ......................................................

01-21

4-4. DESIGN PRECAUTIONS .............................................................

01-22

4-4-1. CAUTION ON SAFETY ...........................................................................

01-22

4-4-2. INSPECTION OPENING AND INSTALLATION MODELS .....................

01-23

4-4-3. USE ENVIRONMENTS ...........................................................................

01-24

4-4-4. HEAT EXCHANGE EFFICIENCY ...........................................................

01-25

4-4-5. DUST COLLECTION EFFICIENCY ........................................................

01-27

4-4-6. NOISE .....................................................................................................

01-28

4-4-7. NOISE CONTROL ...................................................................................

01-29

4-5. VENTILATION DESIGN ................................................................

01-31

4-5-1. QUANTITY, DYNAMIC PRESSURE / STATIC PRESSURE ....................

01-31

4-5-2.

HOW TO CALCULATE REQUIRED VENTILATION VOLUME .................

01-32

4-6. DUCT DESIGN ..............................................................................

01-33

4-6-1. CALCULATION OF PRESSURE LOSSES DUE TO VENTILATION

THROUGH DUCT ....................................................................................

01-33

- (01-01) -

1. SPECIFICATIONS

1-1. SPECIFICATIONS

Model No.

Item

UTZ-BD025B

Power Source 220–240V~ 50Hz

Ventilation Mode Heat Exchange Ventilation Normal Ventilation

Notch (Extra high) High Low (Extra high) High Low

Input (W) 112-128 108-123 87-96 112-128 108-123 87-96

Air Volume (m3/h) 250 250 190 250 250 190

External Static Pressure (Pa) 105 95 45 105 95 45

Sound Pressure Level (dB) 30.0-31.5 29.5-30.5 23.5-26.5 30.0-31.5 29.5-30.5 23.5-26.5

Temperature Exchange

Efciency (%)

75 75 77 — — —

Dimensions (mm)
(H x W x D)

Net 270 x 882 x 599

Gross 349 x 1132 x 795

Weight (kg)

Net 29

Gross 35

Outlet Duct Diameter (mm) 150

Operation Range (°C) -10 to 40
Maximum Humidity (%) 85

Model No.

Item

UTZ-BD035B

Power Source 220–240V~ 50Hz

Ventilation Mode Heat Exchange Ventilation Normal Ventilation

Notch (Extra high) High Low (Extra high) High Low

Input (W) 182-190 178-185 168-175 182-190 178-185 168-175

Air Volume (m3/h) 350 350 240 350 350 240

External Static Pressure (Pa) 140 60 45 140 60 45

Sound Pressure Level (dB) 32.5-33.0 30.5-31.0 22.5-25.5 32.5-33.0 30.5-31.0 22.5-25.5

Temperature Exchange

Efciency (%)

75 75 78 — — —

Dimensions (mm)
(H x W x D)

Net 317 x 1050 x 804

Gross 396 x 1250 x 1000

Weight (kg)

Net 49

Gross 57

Outlet Duct Diameter (mm) 150

Operation Range (°C) -10 to 40
Maximum Humidity (%) 85

Model No.

Item

UTZ-BD050B

Power Source 220–240V~ 50Hz

Ventilation Mode Heat Exchange Ventilation Normal Ventilation

Notch (Extra high) High Low (Extra high) High Low

Input (W) 263-289 204-225 165-185 263-289 204-225 165-185

Air Volume (m3/h) 500 500 440 500 500 440

External Static Pressure (Pa) 120 60 35 120 60 35

Sound Pressure Level (dB) 36.5-37.5 34.5-35.5 31.0-32.5 36.5-37.5 34.5-35.5 31.0-32.5

Temperature Exchange

Efciency (%)

75 75 76 — — —

Dimensions (mm)
(H x W x D)

Net 317 x 1090 x 904

Gross 396 x 1290 x 1100

Weight (kg)

Net 57

Gross 66

Outlet Duct Diameter (mm) 200

Operation Range (°C) -10 to 40
Maximum Humidity (%) 85

- (01-02) -

Model No.

Item

UTZ-BD080B

Power Source 220–240V~ 50Hz

Ventilation Mode Heat Exchange Ventilation Normal Ventilation

Notch (Extra high) High Low (Extra high) High Low

Input (W) 387-418 360-378 293-295 387-418 360-378 293-295

Air Volume (m3/h) 800 800 630 800 800 630

External Static Pressure (Pa) 140 110 55 140 110 55

Sound Pressure Level (dB) 37.0-37.5 36.5-37.0 33.5-34.5 37.0-37.5 36.5-37.0 33.5-34.5

Temperature Exchange

Efciency (%)

75 75 76 — — —

Dimensions (mm)
(H x W x D)

Net 388 x 1322 x 884

Gross 467 x 1552 x 1170

Weight (kg)

Net 71

Gross 82

Outlet Duct Diameter (mm) 250

Operation Range (°C) -10 to 40
Maximum Humidity (%) 85

Model No.

Item

UTZ-BD100B

Power Source 220–240V~ 50Hz

Ventilation Mode Heat Exchange Ventilation Normal Ventilation

Notch (Extra high) High Low (Extra high) High Low

Input (W) 437-464 416-432 301-311 437-464 416-432 301-311

Air Volume (m3/h) 1000 1000 700 1000 1000 700

External Static Pressure (Pa) 105 80 75 105 80 75

Sound Pressure Level (dB) 37.5-38.5 37.0-37.5 33.5-34.5 39.5-40.5 39.0-39.5 35.5-36.5

Temperature Exchange

Efciency (%)

75 75 76 — — —

Dimensions (mm)
(H x W x D)

Net 388 x 1322 x 1134

Gross 467 x 1552 x 1420

Weight (kg)

Net 83

Gross 98

Outlet Duct Diameter (mm) 250

Operation Range (°C) -10 to 40
Maximum Humidity (%) 85

(Note) This noise of the product is the value which was measured at the acoustic room.

Actually, in the established condition, that undergo inuence by the echoing of the room and so that become bigger

than the display numerical value.

- (01-03) -

2. DIMENTIONS

2-1. UTZ-BD025B

NO.

Parts Name

Qty.

Material Remarks

1

Frame

1

Galvanized sheets

2

Adapter

4

ABS

3

Electrical Equipment Box

1

4

Inspection Cover

1

Galvanized sheets

5

Fan

2

ABS

6

Motor

2

7

Heat Exchange Element1Special paper + Resin

8

Filter

2

Nylon-Polyester Fiber Collection Efciency AFI 82%

9

Damper

1

10

Damper Motor

1

11

Ceiling Suspension Fixture4Galvanized sheets





BE CAREFUL OF DEWING AND
FROSTING

As shown in the Figure, suppose a high temp absorbing air condition
A and a low temp absorbing air condition B are plotted on the air line
gure, 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 aboid this, you 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.

saturationcurve

Dry-bulb temperature(˚C)

Absolite humidity (kg/kg’)

C’

C

B

B’

A



REFERENCE SKETCH

Pipe Hood

Outside Intake Duct

Ceilling Suspension Bolts

Supply Air Duct

EA

(Exhaust

Air)

OA
(Outside intake Air)

RA

(Room Air)

SA

(Supply Air)

Inside Supply Opening

(Supply/Exhaust Air Grill)

Room Intake Opening

(Supply/Exhaust Air Grill)

Room Intake Duct

Heat Insulation Material

Exhaust Air Duct

The two outside ducts(the Outside Intake Duct and the

Exhaust Duct)must be insulated to prevent condensation.
(Material; Glass wool, Thickness; 25)



Duct size (Nominal Diameter): ø150



The above dimensions do not include the thickness of

the insulasion material on the unit body.

② ⑤ ⑥ ⑩ ⑨

①

⑦

⑪

599600

142 315 142

EA

OA

(Exhaust Air)

(Outside Air)

810

Maintenance Space

Inspection Opening □450

(For the inspection of the lters, heat exchange elements, fans, motors, and damper)

4-13×30 Oval hole · Suspension Fittings

1965519

RA

SA

(Room Air)

(Supply Air)

An inspection opening is necessary to

clean the heat exchange element and

lter once or twice a year.

270

247

159

135

12

80

④

⑧

③

882

414

95

95

Wiring Diagram

Earth Terminal

Ø219

Ø164

Ø144

67

157

- (01-04) -



SPECIFICATIONS

Model

No.

Power

Source

Notch

Frequency

Heat Exchange Ventilation Normal Ventilation

Product

Weight

Input Current

Air

Volume

External

Static

Pressure

Temperature

Exchange

Efciency

Enthalpy

Exchange

Efciency (%)

Noise Input Current

Air

Volume

External

Static

Pressure

Noise

(Hz) (W) (A) (m3/h) (Pa) (%) Cooling Heating (dB) (W) (A) (m3/h) (Pa) (dB) (kg)

UTZ-

BD025B

220-240V

a.c.

Extra High

50 112-128 0.51-0.53 250 105 75 63 70 30.0-31.5 112-128 0.51-0.53 250 105 30.0-31.5

29

High

50 108-123 0.49-0.51 250 95 75 63 70 29.5-30.5 108-123 0.49-0.51 250 95 29.5-30.5

Low

50 87-96 0.40-0.41 190 45 77 65 72 23.5-26.5 87-96 0.40-0.41 190 45 23.5-26.5



This noise of the product is the value which was measured at the acoustic room. Actually, in the established condition, that undergo inuence

by the echoing of the room and so that become bigger than the display numerical value .



PERFORMANCE

Use conditions

Outdoor air conditions

Temperature range -10˚C ~ 40˚C
Relative humidity 85% or less

Indoor air conditions

Temperature range -10˚C ~ 40˚C
Relative 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 place s

where temperature can uctuate greatly is
prohibited even if a temperature range is
acceptable.

Example

Indoor air conditions

During cooling period

Temperature 27˚C
Relative humidity 50%

During heating period

Temperature 20˚C
Relative humidity 40%

• The Input, the current and the exchange
efficiency are values at the time of the

mentioned air volume.

• The noise level shall be measured 1.5m
below the center of the unit.

• Th e temp erat ure exch ange effic ienc y

averages that of when cooling and when
heating.



MOTOR
SPECIFICATIONS

Type

4 Poles open type

induction motor

Rating Cont.

Insulation Class class E

Temperature Rise under 75 K

Sorrounding Temperature

-10˚C ~ 40˚C

Insulation Resistance

over 1MΩ (by DC500V)

Withstand Voltage AC 1,500V for 1min

300

0 50 100 150 200 250 300 350

50

100

150

200

250

0 20 40 60 80 100 120 140 160 180 200 220

Air Volume (m

3

/h)

Air Volume (ft

3

/min)

External Static Pressure (Pa)

80

50

60

70

Exchange Efciency (%)

Duct resistance Curve

P-Q Curve

220 - 240V ~ 50HzEfciency Curve

T

e

m

pe

ra

t

u

r

e

E

nt

h

al

p

y

(i

n

h

e

a

t

i

n

g

)

E

nt

h

al

p

y

(i

n

c

o

o

li

n

g

)

Extra High

Equivalent pipe length

High

Low



When friction coefcient of pipe (duct) :

=0.02

100m

80

60

20

40

- (01-05) -

2-2. UTZ-BD035B

NO.

Parts Name

Qty.

Material Remarks

1

Frame

1

Galvanized sheets

2

Adapter

4

ABS

3

Electrical Equipment Box

1

4

Inspection Cover

1

Galvanized sheets

5

Fan

2

ABS

6

Motor

2

7

Heat Exchange Element2Special paper + Resin

8

Filter

2

Nylon-Polyester Fiber Collection Efciency AFI 82%

9

Damper

1

10

Damper Motor

1

11

Ceiling Suspension Fixture4Galvanized sheets





BE CAREFUL OF DEWING AND
FROSTING

As shown in the Figure, suppose a high temp absorbing air condition
A and a low temp absorbing air condition B are plotted on the air line
gure, 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 aboid this, you 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.

saturationcurve

Dry-bulb temperature(˚C)

Absolite humidity (kg/kg’)

C’

C

B

B’

A



REFERENCE SKETCH

Pipe Hood

Outside Intake Duct

Ceilling Suspension Bolts

Supply Air Duct

EA

(Exhaust

Air)

OA
(Outside intake Air)

RA

(Room Air)

SA

(Supply Air)

Inside Supply Opening

(Supply/Exhaust Air Grill)

Room Intake Opening

(Supply/Exhaust Air Grill)

Room Intake Duct

Heat Insulation Material

Exhaust Air Duct

The two outside ducts(the Outside Intake Duct and the

Exhaust Duct)must be insulated to prevent condensation.
(Material;Glass wool, Thickness;25)



Duct size (Nominal Diameter): ø150



The above dimensions do not include the thickness of

the insulasion material on the unit body.

978

② ⑤ ⑥

⑩

⑨

①

⑦

⑪

804600

112 580 112

EA

OA

(Exhaust Air)

(Outside Air)

Maintenance Space

Inspection Opening □450

(For the inspection of the lters, heat exchange elements, fans, motors, and damper)

4-13×30 Oval hole · Suspension Fittings

1986019

RA

SA

(Room Air)

(Supply Air)

An inspection opening is necessary to

clean the heat exchange element and

lter once or twice a year.

317

247

182

159

35

80

④

⑧

③

1050

470

70

70

Wiring Diagram

Earth Terminal

Ø162

Ø144

122

157

- (01-06) -



SPECIFICATIONS

Model

No.

Power

Source

Notch

Frequency

Heat Exchange Ventilation Normal Ventilation

Product

Weight

Input Current

Air

Volume

External

Static

Pressure

Temperature

Exchange

Efciency

Enthalpy

Exchange

Efciency (%)

Noise Input Current

Air

Volume

External

Static

Pressure

Noise

(Hz) (W) (A) (m3/h) (Pa) (%) Cooling Heating (dB) (W) (A) (m3/h) (Pa) (dB) (kg)

UTZ-

BD035B

220-240V

a.c.

Extra High

50 182-190 0.63-0.65 350 140 75 66 69 32.5-33.0 182-190 0.63-0.65 350 140 32.5-33.0

49

High

50 178-185 0.59-0.60 350 60 75 66 69 30.5-31.0 178-185 0.59-0.60 350 60 30.5-31.0

Low

50 168-175 0.56-0.57 240 45 78 71 73 22.5-25.5 168-175 0.56-0.57 240 45 22.5-25.5



This noise of the product is the value which was measured at the acoustic room. Actually, in the established condition, that undergo inuence

by the echoing of the room and so that become bigger than the display numerical value .



PERFORMANCE

Use conditions

Outdoor air conditions

Temperature range -10˚C ~ 40˚C
Relative humidity 85% or less

Indoor air conditions

Temperature range -10˚C ~ 40˚C
Relative 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 place s

where temperature can uctuate greatly is
prohibited even if a temperature range is
acceptable.

Example

Indoor air conditions

During cooling period

Temperature 27˚C
Relative humidity 50%

During heating period

Temperature 20˚C
Relative humidity 40%

• The Input, the current and the exchange
efficiency are values at the time of the

mentioned air volume.

• The noise level shall be measured 1.5m
below the center of the unit.

• Th e temp erat ure exch ange effic ienc y

averages that of when cooling and when
heating.



MOTOR
SPECIFICATIONS

Type

4 Poles open type

induction motor

Rating Cont.

Insulation Class class E

Temperature Rise under 75 K

Sorrounding Temperature

-10˚C ~ 40˚C

Insulation Resistance

over 1MΩ (by DC500V)

Withstand Voltage AC 1,500V for 1min

350

0 100 200 300 400 500 600

50

100

150

200

300

0 50 100 150 200 250 300 350

Air Volume (m

3

/h)

Air Volume (ft

3

/min)

External Static Pressure (Pa)

80

50

60

70

Exchange Efciency (%)

Duct resistance Curve

P-Q Curve 220 - 240V ~ 50HzEfciency Curve

T

e

m

p

e

r

a

t

u

r

e

E

n

t

h

a

l

p

y

(

i

n

h

e

a

t

i

n

g

)

E

n

t

h

a

l

p

y

(

i

n

c

o

o

l

i

n

g

)

Extra High

Equivalent pipe length

High

Low



When friction coefcient of pipe (duct) :

=0.02

60m

40

20

250

10

- (01-07) -

2-3. UTZ-BD050B

NO.

Parts Name

Qty.

Material Remarks

1

Frame

1

Galvanized sheets

2

Adapter

4

Galvanized sheets

3

Electrical Equipment Box

1

4

Inspection Cover

1

Galvanized sheets

5

Fan

2

ABS

6

Motor

2

7

Heat Exchange Element2Special paper + Resin

8

Filter

2

Nylon-Polyester Fiber Collection Efciency AFI 82%

9

Damper

1

10

Damper Motor

1

11

Ceiling Suspension Fixture4Galvanized sheets





BE CAREFUL OF DEWING AND
FROSTING

As shown in the Figure, suppose a high temp absorbing air condition
A and a low temp absorbing air condition B are plotted on the air line
gure, 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 aboid this, you 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.

saturationcurve

Dry-bulb temperature(˚C)

Absolite humidity (kg/kg’)

C’

C

B

B’

A



REFERENCE SKETCH

Pipe Hood

Outside Intake Duct

Ceilling Suspension Bolts

Supply Air Duct

EA

(Exhaust

Air)

OA
(Outside intake Air)

RA

(Room Air)

SA

(Supply Air)

Inside Supply Opening

(Supply/Exhaust Air Grill)

Room Intake Opening

(Supply/Exhaust Air Grill)

Room Intake Duct

Heat Insulation Material

Exhaust Air Duct

The two outside ducts(the Outside Intake Duct and the

Exhaust Duct)must be insulated to prevent condensation.
(Material;Glass wool, Thickness;25)



Duct size (Nominal Diameter): ø200



The above dimensions do not include the thickness of

the insulasion material on the unit body.

②

⑤

⑥

⑩

⑨

①

⑦

⑪

904600

132 640 132

EA

OA

(Exhaust Air)

(Outside Air)

1018

Maintenance Space

Inspection Opening □450
(For the inspection of the lters, heat exchange elements, fans, motors, and damper)

4-13×30 Oval hole · Suspension Fittings

1996019

RA

SA

(Room Air)

(Supply Air)

An inspection opening is necessary to

clean the heat exchange element and

lter once or twice a year.

317

159

182

247

35

80

④

⑧

③

1090

470

127

70

Wiring Diagram

Earth Terminal

Ø210

Ø194

157

70

- (01-08) -



SPECIFICATIONS

Model

No.

Power

Source

Notch

Frequency

Heat Exchange Ventilation Normal Ventilation

Product

Weight

Input Current

Air

Volume

External

Static

Pressure

Temperature

Exchange

Efciency

Enthalpy

Exchange

Efciency (%)

Noise Input Current

Air

Volume

External

Static

Pressure

Noise

(Hz) (W) (A) (m3/h) (Pa) (%) Cooling Heating (dB) (W) (A) (m3/h) (Pa) (dB) (kg)

UTZ-

BD050B

220-240V

a.c.

Extra High

50 263-289 1.20-1.21 500 120 75 62 67 36.5-37.5 263-289 1.20-1.21 500 120 36.5-37.5

57

High

50 204-225 0.93-0.94 500 60 75 62 67 34.5-35.5 204-225 0.93-0.94 500 60 34.5-35.5

Low

50 165-185 0.75-0.77 440

35

76 64 69 31.0-32.5 165-185 0.75-0.77 440

35

31.0-32.5



This noise of the product is the value which was measured at the acoustic room. Actually, in the established condition, that undergo inuence

by the echoing of the room and so that become bigger than the display numerical value .



PERFORMANCE

Use conditions

Outdoor air conditions

Temperature range -10˚C ~ 40˚C
Relative humidity 85% or less

Indoor air conditions

Temperature range -10˚C ~ 40˚C
Relative 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 place s

where temperature can uctuate greatly is
prohibited even if a temperature range is
acceptable.

Example

Indoor air conditions

During cooling period

Temperature 27˚C
Relative humidity 50%

During heating period

Temperature 20˚C
Relative humidity 40%

• The Input, the current and the exchange
efficiency are values at the time of the

mentioned air volume.

• The noise level shall be measured 1.5m
below the center of the unit.

• Th e temp erat ure exch ange effic ienc y

averages that of when cooling and when
heating.



MOTOR
SPECIFICATIONS

Type

4 Poles open type

induction motor

Rating Cont.

Insulation Class class E

Temperature Rise under 75 K

Sorrounding Temperature

-10˚C ~ 40˚C

Insulation Resistance

over 1MΩ (by DC500V)

Withstand Voltage AC 1,500V for 1min

400

0 100 200 300 400 500 600 700 800

50

100

150

200

300

0 50 100 150 200 250 300 350 400 450

Air Volume (m

3

/h)

Air Volume (ft

3

/min)

External Static Pressure (Pa)

80

50

60

70

Exchange Efciency (%)

Duct resistance Curve

P-Q Curve

220 - 240V ~ 50HzEfciency Curve

T

e

m

p

e

r

a

t

u

r

e

E

n

t

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Extra High

Equivalent pipe length

High

Low



When friction coefcient of pipe (duct) :

=0.02

100m

60

40

250

20

350

80

- (01-09) -

2-4. UTZ-BD080B

NO.

Parts Name

Qty.

Material Remarks

1

Frame

1

Galvanized sheets

2

Adapter

4

Galvanized sheets

3

Electrical Equipment Box

1

4

Inspection Cover

1

Galvanized sheets

5

Fan

2

ABS

6

Motor

2

7

Heat Exchange Element3Special paper + Resin

8

Filter

2

Nylon-Polyester Fiber Collection Efciency AFI 82%

9

Damper

1

10

Damper Motor

1

11

Ceiling Suspension Fixture4Galvanized sheets





BE CAREFUL OF DEWING AND
FROSTING

As shown in the Figure, suppose a high temp absorbing air condition
A and a low temp absorbing air condition B are plotted on the air line
gure, 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 aboid this, you 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.

saturationcurve

Dry-bulb temperature (˚C)

Absolite humidity (kg/kg’)

C’

C

B

B’

A



REFERENCE SKETCH

Pipe Hood

Outside Intake Duct

Ceilling Suspension Bolts

Supply Air Duct

EA

(Exhaust

Air)

OA
(Outside intake Air)

RA

(Room Air)

SA

(Supply Air)

Inside Supply Opening

(Supply/Exhaust Air Grill)

Room Intake Opening

(Supply/Exhaust Air Grill)

Room Intake Duct

Heat Insulation Material

Exhaust Air Duct

The two outside ducts(the Outside Intake Duct and the

Exhaust Duct)must be insulated to prevent condensation.
(Material;Glass wool, Thickness;25)



Duct size (Nominal Diameter): ø250



The above dimensions do not include the thickness of

the insulasion material on the unit body.

②

⑤

⑥

⑩

⑨

①

⑦

⑪

884600

228 428 228

EA

OA

(Exhaust Air)

(Outside Air)

1250

Maintenance Space

Inspection Opening □450
(For the inspection of the lters, heat exchange elements, fans, motors, and damper)

4-13×30 Oval hole · Suspension Fittings

1994019

RA

SA

(Room Air)

(Supply Air)

⑧

An inspection opening is necessary to

clean the heat exchange element and

lter once or twice a year.

388

194

218

247101

80

④

⑧

③

1322

612

85

85

Wiring Diagram

Earth Terminal

Ø258

Ø242

184157