Fujitsu UTZ-BD035B User 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 Element 1 Special paper + Resin
8 Filter 2 Nylon-Polyester Fiber Collection Efciency AFI 82%
9 Damper 1
10 Damper Motor 1
11 Ceiling Suspension Fixture 4 Galvanized 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
BB’
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
①⑦⑪
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 places
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.
• The temperature exchange efficiency
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 (m3/h)
Air Volume (ft3/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 Element 2 Special paper + Resin
8 Filter 2 Nylon-Polyester Fiber Collection Efciency AFI 82%
9 Damper 1
10 Damper Motor 1
11 Ceiling Suspension Fixture 4 Galvanized 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
BB’
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 ⑥ ⑩⑨
①⑦⑪
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 places
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.
• The temperature exchange efficiency
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 (m3/h)
Air Volume (ft3/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 Element 2 Special paper + Resin
8 Filter 2 Nylon-Polyester Fiber Collection Efciency AFI 82%
9 Damper 1
10 Damper Motor 1
11 Ceiling Suspension Fixture 4 Galvanized 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
BB’
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.
②⑤⑥⑩⑨
①⑦⑪
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 places
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.
• The temperature exchange efficiency
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 (m3/h)
Air Volume (ft3/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
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 Element 3 Special paper + Resin
8 Filter 2 Nylon-Polyester Fiber Collection Efciency AFI 82%
9 Damper 1
10 Damper Motor 1
11 Ceiling Suspension Fixture 4 Galvanized 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
BB’
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.
②⑤⑥⑩⑨
①⑦⑪
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

- (01-10) -

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-
BD080B
220-240V
a.c.
Extra High
50 387-418 1.74-1.76 800 140 75 65 71 37.0-37.5 387-418 1.74-1.76 800 140 37.0-37.5
71
High
50 360-378 1.58-1.64 800 110 75 65 71 36.5-37.0 360-378 1.58-1.64 800 110 36.5-37.0
Low
50 293-295 1.23-1.33 630 55 76 68 74 33.5-34.5 293-295 1.23-1.33 630 55 33.5-34.5
 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
400
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
50
100
150
200
300
0 100 200 300 400 500 600 700
Air Volume (m3/h)
Air Volume (ft3/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
nt
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
100m
60
40
250
20
350
80
90450
500
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 places
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.
• The temperature exchange efficiency
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

- (01-11) -
2-5. UTZ-BD100B
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 Element 4 Special paper + Resin
8 Filter 2 Nylon-Polyester Fiber Collection Efciency AFI 82%
9 Damper 1
10 Damper Motor 1
11 Ceiling Suspension Fixture 4 Galvanized 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
BB’
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.
②⑤⑥⑩⑨
①⑦⑪
1134600
228 678 228
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
19119019
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
157 184

- (01-12) -

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-
BD100B
220-240V
a.c.
Extra High
50 437-464 1.93-1.99 1000 105 75 65 71 37.5-38.5 437-464 1.93-1.99 1000 105 37.5-38.5
83
High
50 416-432 1.80-1.89 1000 80 75 65 71 37.0-37.5 416-432 1.80-1.89 1000 80 37.0-37.5
Low
50 301-311 1.29-1.37 700 75 79 70 76 33.5-34.5 301-311 1.29-1.37 700 75 33.5-34.5
 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
400
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300
50
100
150
200
300
0 100 200 300 400 500 600 700
Air Volume (m3/h)
Air Volume (ft3/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
100m
60
40
250
20
350
80
90
500
450
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 places
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.
• The temperature exchange efficiency
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

- (01-13) -
3. WIRING DIAGRAMS
3-1. UTZ-BD025B
SW1
Switch
Low
Damper
High
Power Source
220-240V~single
phase 50Hz
Yellow Yellow
White White
Black Black
Blue
Connector Connector
(Connector) Connector
White
White(Extra high)
White
Black Black
Black
Black
(Connector)
Capacitor
Capacitor
White
White
Yellow
Red
Blue(High)
Orange Orange
Red
Yellow
Blue
White(Extra high)
Blue(High)
Yellow
Red
Orange Orange
Connector
Red
Yellow
Blue
Supply
Air Fan
Exhaust
Air Fan
Micro switch
Damper
Motor
Power Source
(Line)
Power Source
(Neutral)
High
Main unit
L
(Voltage)
N
(Ground)
SW1
SW2
Common
Low
Damper
Terminal
board
Grey
White
White
Blue
Black
Black Red
Red
White
Black
Brown
Blue Black
Red
Red
Black
White
Brown
Black
Black
Black
White
White
Yellow
Yellow
Relay 1
Relay 2
Relay 3
White White
Yellow
Grey
Second main body
Function Select Switch
(3) Energy Recovery
Ventilation
(1) Normal Ventilation
To find out the function of
each switch, refer to Page 7
of the Owner’s manual.
Air Flow Switch
(3) High
(1) Low
Operation Switch
(3) (ON)
(1) (OFF)
UTZ-BD025B
3-2. UTZ-BD035B, UTZ-BD050B
SW1
Switch
Low
Damper
High
Power Source
220-240V~single
phase 50Hz
Power Source
(Line)
Power Source
(Neutral)
Second main body
High
Main unit
L
N
SW1
SW2
Common
Low
Damper
Terminal
board
Grey
White
White
Blue
Black
Black Red
Red
White
Black
Brown
Blue Black
Red
Red
Black
White
Brown
Black
Black
Black
White
White
Yellow
Yellow
Relay 1
Relay 2
Relay 3
White White
Yellow
Grey
Black
Black
(Connector)
Capacitor
White
White
White(Extra high)
Blue(High)
Yellow
Red
Orange Orange
Connector
Red
Yellow
Blue
Supply
Air Fan
(Connector) Connector
White
White(Extra high)
White
Black Black
Capacitor
Yellow
Red
Blue(High)
Orange Orange
Red
Yellow
Blue
Exhaust
Air Fan
Yellow Yellow
White White
Black Black
Blue
Connector Connector Micro switch
Damper
Motor
Function Select Switch
(3) Energy Recovery
Ventilation
(1) Normal Ventilation
Air Flow Switch
(3) High
(1) Low
Operation Switch
(3) (ON)
(1) (OFF)
UTZ-BD035B
Model No, Capacitor
3.5 µF 450VAC
6.0 µF 450VAC
UTZ-BD050B

- (01-14) -
3-3. UTZ-BD080B, UTZ-BD100B
UTZ-BD080B
Model No, Capacitor
10.0 µF 450VAC
10.0 µF 450VAC
UTZ-BD100B
SW1
Switch
Low
Damper
High
Blue
Black Grey
Grey
Brown
Relay 4
Black
Red
Red
Black
White Black
Black
White
White
Yellow
Yellow
Relay 1
Grey
Black Relay 2
Relay 3
White White
Yellow
Grey
Black
Black
(Connector)
Capacitor
White
White
White(Extra high)
Blue(High)
Yellow
Red
Orange Orange
Connector
Red
Yellow
Blue
Supply
Air Fan
(Connector) Connector
White
White(Extra high)
White
Black Black
Capacitor
Yellow
Red
Blue(High)
Orange Orange
Red
Yellow
Blue
Exhaust
Air Fan
Yellow Yellow
White White
Black Black
Blue
Blue
Connector Connector Micro switch
Damper
Motor
Power Source
(Line)
Power Source
(Neutral)
High
Main unit
L
N
SW1
SW2
Common
Low
Damper
Terminal
board
Grey
White
White
Blue
Black
Black Red
Red
White
Black
Brown
Blue
Second main body
Power Source
220-240V~single
phase 50Hz
Function Select Switch
(3) Energy Recovery
Ventilation
(1) Normal Ventilation
Air Flow Switch
(3) High
(1) Low
Operation Switch
(3) (ON)
(1) (OFF)

- (01-15) -
3-4. INTERLOCKED CONNECTION TO AIR CONDITIONER
● Operation is performed simultaneously with the air conditioner.
● Setting changes are made by energy recovery ventilator switch.
Relay
Air conditioner Energy recovery ventilator
Air conditioner
remote controller
Energy recovery
ventilator switch

Connection method
● Perform electrical work in accordance with the laws and regulations of each country.
● Check whether or not there is an external output and the necessary connector terminals at the air conditioner using the air conditioner technical
manual beforehand. The external output (operation status output) of the indoor unit PC board is used.
● There is a type of external output from the air conditioner which requires an external power source and a type which does not require an
external power source. The type is different depending on the model.
● The allowable voltage/current of the external output circuit from the air conditioner varies depending on the model. Check it with the air
conditioner technical manual.
● Do not connect the energy recovery ventilator power source (AC220-240V) to the external output terminals from the air conditioner.
● Regarding the relay circuit, select the necessary capacity from the allowable current value of the external output terminals and the current value
of the energy recovery ventilator and connect.
(1) When energy recovery ventilator operation is unnecessary
For energy recovery ventilator, airflow switching and heat exchange ventilation / normal ventilation switching cannot be
performed.
The gure shown below indicates the operation with airow HIGH and heat exchange ventilation.
Provided at the site
Power source
AC220-240V
50Hz
Energy recovery ventilator
terminal
Indoor unit PC board Relay circuit
L
N
SW1
SW2
COMMON
LOW
HIGH
DAMPER
N L

- (01-16) -
(2) When you want to operate using the energy recovery ventilator switch
Operation is performed simultaneously by air conditioner remote controller even when the energy recovery ventilator switch
is in the OFF state.
The energy recovery ventilator can be operated by energy recovery ventilator switch even when the air conditioner is in the
stopped state.
Do not make connections to multiple indoor units by duct direct connection system.
Dust may be dispersed depending on the operation condition of the air conditioner.
Energy recovery
ventilator
Dust
Room air
Room air
Stopped
External air
Operating
Power source
AC220-240V
50Hz
Energy recovery ventilator
terminal
Indoor unit PC board Relay circuit
Provided at the site
Energy recovery
ventilator switch
L
N
SW1
SW2
COMMON
LOW
HIGH
DAMPER
N L
ON
OFF
HIGH
LOW
HEAT EXCHANGE
NORMAL

- (01-17) -
4. DESIGN SECTION
4-1. ABOUT HEAT EXCHANGE UNIT
4-1-1. BASIC ENGIN

BASIC PRINCIPLE AND
STRUCTURE OF THE HEAT
EXCHANGER
Basic principle of a heat exchanger
The basic principle of a heat exchanger is as indicated
below. As heat moves from a high-temperature area to a
low-temperature area together with humidity, the heated and
moist air moves the heat and humidity to colder and drier air
by passing through a heat-exchange element.
Warm and moist
ai
r
Heat-exchange element
HeatHumidity
Cold and
dry air
Function of a heat exchanger
A heat exchanger effectively recovers cooled or heated room
temperatures and simultaneously ventilates air.
Winter
Mechanism of a heat exchange element
The heat exchange element can allow the exhaust air from
inside and the fresh air from outside to transmit temperature
and humidity without being mixed up.
Indoor exhaust
Outdoor inlet
Mechanism of total heat ex-
change
HeatIndoor air
upply at 14
Humidity s
Cold air at
0
Indoor air
supply
Outdoor
exhaust
Outdoor
exhaust at 6 Humidity
Heat exchange
element
0°C
6°C 14°C
20°C
Heat exchange
ratio at 70%
Warm air at
20
Heat
ADVANTAGES OF THE HEAT
EXCHANGE ELEMENT
The height of the heat exchange element
reduced by 20%
The upper and lower protrusions have been cut out (see the gure
below). The newly adopted counter-ow
heat exchange system has made the
entire unit much thinner from 287mm
to 230mm, and realized the same
performance as in the conventional
cross-ow heat exchange element.
Comparison of heat exchange elements
C tross-flow elemen Counter-flow ele-
ment
While airflows are directly crossed in the cross-flow ele-
ment, the counter-flow element allows airflow to be retained
for longer time (or longer distance). In this manner, the
thinner system can maintain the heat exchange perform-
ance attained b
y
its thicker counterpart.
Total heat exchange efciency improved by
6%
The adoption of the counter-flow element has improved
the total heat exchange ratio by about 6%, significantly
contributing to energy saving.
Long-life heat exchange element
By adopting nonwoven fabric filter with excellent dust
collection efficiency and improving the air course shapes,
a long-life heat exchange system has been realized, which
does not require regular cleaning of the heat exchange
element.
cross-flow element
After cleaning the
cross-flow element
The counter-flow element
Heat exchange element with
extended life
The cross-flow element
requires regular clean-ups.
A
irflow
resistance
Changes in airflow resistance
with the
y
ears of use
Cleaned
Used
Initial
level
1st
year
2nd
year
3rd
year
4th
year
5th
year
6th
year
7th
year
8th
year
9th
year
10th
year
Service year
The counter-flow element requires no regula
r
clean-up, as the resistance level hardly rise.
Long-life heat exchange element
Conventional element
(corrugated structure)
With the above features, airflow resistance affecting service life hardly rises.
The end section is finished with the resin-formed
structure characterized by robustness
Bigger air-course per cell
The fin structure is seldom crushed or damaged.
Dirt and dust are seldom attached.
New-type element
Heat exchanger
p
l
ate (pape
r
)
Hydraulic
diamete
r
Spacing plate
(paper)
Spacing rib (resin)
Heat exchanger
p
late
(p
a
p
er
)
Hydraulic
diamete
r
Before cleaning the
cross-flow element
After cleaning the
cross-flow element
The counter-flow element
Heat exchange element with
extended life
The cross-flow element
requires regular clean-ups.
A
irflow
resistance
Changes in airflow resistance
with the
y
ears of use
Cleaned
Used
Initial
level
1st
year
2nd
year
3rd
year
4th
year
5th
year
6th
year
7th
year
8th
year
9th
year
10th
year
Service year
The counter-flow element requires no regula
r
clean-up, as the resistance level hardly rise.
Long-life heat exchange element
Conventional element
(corrugated structure)
With the above features, airflow resistance affecting service life hardly rises.
The end section is finished with the resin-formed
structure characterized by robustness
Bigger air-course per cell
The fin structure is seldom crushed or damaged.
Dirt and dust are seldom attached.
New-type element
Heat exchanger
p
l
ate (pape
r
)
Hydraulic
diamete
r
Spacing plate
(paper)
Spacing rib (resin)
Heat exchanger
p
late
(p
a
p
er
)
Hydraulic
diamete
r
Before cleaning the