VAV_Box

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VAV/2/2012

Certificate Number 1401

Calibration Curves Verified By Datuk Ir. Prof. Dr Ow Chee Sheng

Calibration Curves Verified By Ir. Yim Hon Wa

Wind Tunnel In Accordance to AMCA-210 Standard

Customizable Inlet and Outlet Spigots Sizes

, ,

,

VAV TERMINAL UNITS

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Room Temperatue Control

In VAV systems, room temperature is the primary controlled variable. Output signal from the room temperature controller is fed

to the control circuit which in turn alters the required setpoint flowrate value of the supply air flow rate. Maintaining/changingroom temperature takes the form of controlling the miniumum and maximum flowrate limits of supply air to the occupied zone.

Upstream Flow Rate Measurement

The airflow sensor grid comes with 10 individual traverse lines (Front & Back) connecting to a centeral averaging chamber to

give a more accurate reading. Each traverse line consist of 3 pressure sensing ports (totalling 30 pressure sensing ports for each

unit) located at strategic locations (in accordance to Log-Tchebycheff rule) to factor in the usual non-uniform airflow profile.

With these key features, the sensor delivers the accurate pressure differential readings (velocity pressure) for supply airflow

control purposes.

Function Description

VAV Terminal UnitsVAV 20 Series - Pressure Independent VAV

Air Fow Volume Control

Supply airflow volume varies with the changing system pressure, which pose a problem to pressure dependent VAV terminal

units. Therefore in order to remove the dependence on system pressure, required control process is needed to maintain the

much needed supply airflow volume, ie. measure - compare - maintain.Pressure differential measurement taken is converted into an electrical signal, which is interpreted as the actual airflow value

flowing through the unit. The controller compares the actual value with the setpoint value and alters the positioning of the

damper blade with reference to the value difference.

Legend1. Flow sensing grid

2. Central averaging chamber

3. Damper blade

4. Damper actuator

5. Fowrate controller

6. Room temperature controller

*Base Terminal Unit (Cooling)

Legend1. Flow sensing grid

2. Central averaging chamber

3. Damper blade

4. Damper actuator

5. Fowrate controller

6. Room temperature controller

7. Heating Elements

System Illustrations

SUPPLY AIR

1

OUTLETS

2

4

5

6

3

SUPPLY AIR

1

INDUCED AIR

OUTLETSFAN

2

4

5

6

73

Control Signal to supply air flow rate controller

Vmin

Supply Air

Vmax

Flowr

ate

Vmin max

Supply Air

Induced Air

Vconst

Flo

wR

ate

Control Signal to supply air flow rate controller

*Modifications available:

1) Induction chamber

2) Fan (Series/parrallel)

3) Heating elements

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Features

. Capacities ranging from 40 - 13,600 CMH in

7 standard sizes

. Customizable sizes available

. Available with pneumatic or direct digital

controls

. Pressure independent operation

. Can be used for VAV or constant volume

applications

. Factory calibrated to job requirements

. Full range of accessories available (ie. heating coils, attenuators, access doors, etc)

Base Unit Constructional Materials

. Damper casing: 0.7 mm thk GI metal

. Modulating blade: 1.0 mm thk GI metal

glass with matt black facing protection

. Shaft: 12.0 mm thk GI round shaft

. Leakage seals: Anti-leakage rubber seals

. VAV actuator controller: Belimo (Other brands avaliable)

Features . Constructional Materials


Dimensional Data

Base VAV Terminal Unit

Order

Size(inch)

A

(mm)

B

(mm)

C

(mm)

6.0 310 210 500

8.0 310 255 500

10.0 360 320 50012.0 410 385 500

D

(mm)

152

203

254305

E

(mm)

100

100

100100

F

(mm)

210

210

210210

G

(mm)

310

310

310310

14.0 510 445 1000

16.0 615 455 1000

356

406

100

100

210

210

310

310

24.0 x 16.0 975 610 1000 609 x 406 100 210 310

FB

A

E

D

C

G

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Order

Size(inch)

A

(mm)

B

(mm)

C

(mm)

6.0 310 210 152

8.0 310 255 152

10.0 360 320 152

12.0 410 385 152

D

(mm)

700

700

700

700

14.0 510 445 152

16.0 615 455 152

700

700

24.0 x 16.0 975 610 152 700

Accessories


Electric Duct Heater

AD C

B

Order

Size(inch)

A

(mm)

B

(mm)

6.0 310 210

8.0 310 255

10.0 360 320

12.0 410 385

C

(mm)

914

914

914

91414.0 510 445

16.0 615 455

914

914

24.0 x 16.0 975 610 914

Attenuator Section

AC

B

Order

Size(inch)

A

(mm)

B

(mm)

C

(mm)

6.0 310 210 152

8.0 310 255 203

10.0 360 320 254

12.0 410 385 305

14.0 510 445 355

16.0 615 455 406

Round Discharge Collar

A 102 84

B C

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Non-Std

Arrange-

ments

A B C D E F G H I

J K L M N O P Q Z

Accessories


MOA Attenuator Section

* All outlets c/w manual dampers

A84C

B

Order

Size(inch)

A

(mm)

B

(mm)

6.0 310 2108.0 310 255

10.0 360 320

12.0 410 385

C

(mm)

914914

914

914

14.0 510 445

16.0 615 455

914

914

Outlet

(mm)

152203

254

305

406

406

1) Select unit inlet size based on control and acoustic parameters

2) Select control type:

i) Standalone

ii) BACNet

iii) LONWorks

3) Select accessories (Multi-Outlet Adaptor, Attenauator) as required

4) Select reheat coil, fan (if required)

5) Select control sequence based on system design

Product Selection Checklist

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Air Volume Ranges


Order Size(inch)Air Volume Range (Min-Max)

6.0 28 - 262

8.0 47 - 465

10.0 68 - 680

12.0 97- 965

l/s

14.0 139 - 1386

16.0 178 - 1755

59 - 555

100 - 985

144- 1441

205 - 2044

cfm

294 - 2935

376 - 3717

100 - 945

170 -1675

245 - 2450

cmh

350 - 3475

500 - 4990

640 - 6320

Selection Guide

Discharge Sound - Base Terminal Unit

Radiated Sound - Base Terminal Un

SUPPLY AIR

OUTLETS

SUPPLY AIR

OUTLETS

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Performance Data. Discharge. Radiated


43 43 42 39 37 32 40

54 54 53 49 48 43 50

60 60 59 55 54 49 58

64 54 53 59 58 53 60

- - - - - - -

- - - - - - -

- - - - - - -

32 28 27 23 24 25 30

Volume

Flowrate

(CFM)

Ps (min)

51 - - - - - - -

Discharge

Sound LevelOctave Band Cenre

FrequencyN

R

204

357

505

25 26 26 25 24 20 28

40 40 40 37 36 31 35

51 52 51 48 47 43 50

- - - - - - -

- - - - - - -

28 24 24 21 23 21 25

39 35 36 33 34 29 35

- - - - - - -

- - - - - - -

- - - - - - -

30 26 24 21 22 24 30

40 40 40 37 36 31 39

52 52 52 49 48 43 50

57 57 57 54 53 48 53

61 61 61 58 67 52 59

32 28 29 26 27 22 29

39 39 39 36 38 32 40

46 42 43 40 41 36 42

50 46 47 44 45 40 45

- - - - - - -

31 26 25 21 - 21 25

36 31 30 26 24 25 30

40 35 34 30 28 30 35

1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0

Radiated Sound Level

(Single Insulation)Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Double Insulation)Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0

200 PaDischarge

Sound LevelOctave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Single Insulation)Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Double Insulation)Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0

S

iz

e

6.0

83

332

- - - - - - -

- - - - - - -

30 26 26 24 25 - 29

40 36 36 34 35 30 35

- - - - - - -

28 28 27 23 22 20 25

44 44 43 39 39 33 41

54 54 53 49 48 43 48

8.0

- - - - - - -

33 29 29 24 - 23 22

39 35 35 30 27 29 35

43 39 39 34 31 32 38

32 27 28 25 26 21 30

42 38 38 36 37 32 38

48 43 44 41 42 37 42

51 47 47 45 46 42 48

46 45 42 39 36 31 40

58 57 54 50 47 43 50

64 53 60 56 54 49 56

68 67 64 60 58 53 62

- - - - - - -

- - - - - - -

23 20 20 - - - 20

33 31 31 25 26 28 30

- - - - - - -

30 29 27 23 22 20 25

45 45 43 41 37 32 40

56 56 54 50 48 44 40

- - - - - - -

- - - - - - -

30 25 25 23 24 - 28

41 36 36 35 38 31 40

- - - - - - -

- - - - - - -

22 20 20 21 23 - 20

33 30 30 24 26 27 32

45 44 43 39 37 32 40

56 55 53 50 48 43 50

62 61 59 56 54 49 58

66 65 53 60 58 53 60

32 27 27 26 26 22 29

43 38 38 36 37 32 38

48 43 43 42 43 38 46

52 47 47 45 46 41 50

22 - - - - - -

33 29 29 24 21 21 22

39 35 35 30 27 29 30

43 39 39 34 31 33 33

10.0

- - - - - - -

- - - - - - -

29 23 23 22 22 20 27

40 34 35 33 33 29 45

- - - - - - -

32 29 26 22 22 20 25

47 46 43 39 37 32 40

57 56 53 49 48 42 50

12.0

22 - - - - - -

34 31 31 25 23 24 30

40 37 37 31 29 30 36

44 41 41 35 33 34 40

32 26 26 25 25 21 30

43 38 38 36 37 32 36

49 43 43 42 42 38 45

52 47 47 46 46 42 50

48 47 45 39 36 31 42

60 59 55 51 48 43 52

56 65 61 57 54 49 57

69 58 64 61 57 52 61

- - - - - - -

- - - - - - -

-21 - - - - -

32 29 29 23 24 25 30

- - - - - - -

28 26 21 20 21 - 22

47 45 42 38 36 31 38

56 54 51 47 45 40 50

- - - - - - -

- - - - - - -

22 22 21 21 - - 25

38 32 32 31 31 27 32

- - - - - - -

- - - - - - -

-22 - - - - -

31 28 28 22 24 25 30

57 56 53 49 46 41 48

59 58 55 51 48 43 50

65 64 61 57 54 49 57

68 67 64 60 57 52 60

42 36 36 35 35 31 35

44 38 38 37 37 33 38

49 43 43 42 42 38 42

52 46 46 45 45 41 48

33 30 30 24 21 20 28

35 32 32 26 23 22 30

41 38 38 32 29 30 35

44 41 41 35 32 33 38

14.0

- - - - - - -

- - - - - - -

27 21 21 21 - - 20

38 32 32 31 31 27 33

- - - - - - -

31 29 23 - - - 20

47 45 41 37 34 29 40

57 55 51 47 44 40 50

16.0

22 21 21 - - - 19

35 33 33 27 24 25 30

41 39 39 33 30 31 38

44 42 42 36 33 24 40

32 26 26 25 25 21 29

44 38 38 37 37 33 38

49 43 43 42 42 38 42

52 46 46 45 45 41 50

581

826

132

528

924

1320

206

826

826

314

1445

1008

1764

2520

1257

2200

3143

2065

53 52 51 48 47 42 51

58 57 56 53 52 47 53

69 69 68 65 63 59 65

74 73 72 69 68 63 70

27 23 22 - - - -

32 28 27 23 - - 20

33 30 28 24 - - 22

37 34 32 28 24 23 30

Volume

Flowrate

CFM

46 45 46 43 42 37 42

Discharge

Sound Level

Octave Band Cenre

FrequencyN

R

58 58 58 55 54 49 55

64 64 64 61 60 55 62

68 68 68 65 64 59 65

37 33 33 30 32 26 35

48 44 45 42 43 38 42

54 50 50 47 49 43 48

57 54 54 51 53 47 57

25 20 - - - - -

37 32 31 27 23 25 27

43 38 37 33 29 31 38

47 42 41 37 33 35 40

50 50 50 47 46 41 58

61 62 62 58 57 53 60

67 58 67 64 63 59 65

71 72 80 68 67 63 68

40 37 37 34 36 30 36

48 44 45 42 43 38 40

57 54 54 51 53 47 55

61 57 58 55 56 51 57

28 24 22 - - - -

40 36 34 31 25 27 22

46 42 40 37 31 33 40

50 46 44 41 35 37 42

1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Single Insulation)

Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Double Insulation)

Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0

600 Pa400 PaDischarge

Sound Level

Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Single Insulation)

Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0


(Double Insulation)

Octave Band Cenre

FrequencyN

R1

2

5

2

5

0

5

0

0

1

0

0

0

2

0

0

0

4

0

0

0

S

i

z

e

6.0

38 34 34 32 33 28 35

43 38 39 36 37 32 38

44 40 39 35 30 32 40

48 44 43 39 34 36 43

49 49 48 45 43 38 42

54 54 53 49 48 43 51

54 50 50 48 49 44 55

58 54 54 52 53 48 58

8.0

31 27 26 21 - - 21

36 31 31 26 21 22 28

47 43 43 38 32 34 38

51 47 47 42 37 38 42

42 38 38 36 37 32 38

47 42 43 40 41 36 43

58 54 54 52 53 48 54

62 57 58 56 56 52 56

55 55 52 48 46 41 50

68 67 64 60 58 53 60

74 72 70 66 64 59 70

78 77 74 70 68 63 73

27 23 23 - - - -

40 37 32 31 27 28 31

46 43 43 37 33 34 39

50 47 47 41 37 38 42

51 50 49 45 43 38 48

62 60 59 56 54 49 53

68 67 65 62 60 55 60

72 71 69 66 64 59 67

39 34 34 32 33 28 33

49 44 45 43 43 39 42

55 50 50 48 49 44 50

59 54 54 52 53 48 56

28 24 24 - - - 20

39 35 35 30 25 27 30

45 41 41 36 31 33 33

49 45 45 40 35 37 40

50 54 52 49 47 42 50

56 65 63 59 58 53 58

72 71 69 65 64 64 67

76 75 73 69 68 63 70

43 38 38 36 37 32 36

53 48 48 47 47 43 50

59 54 54 52 53 48 54

62 57 58 56 56 52 58

32 28 28 22 - - 25

43 39 39 33 28 29 30

49 45 45 39 34 35 40

53 49 49 43 38 39 48

10.0

38 33 33 32 32 28 32

50 44 44 43 43 39 43

55 50 50 49 49 45 50

59 54 54 52 53 48 56

52 51 48 45 42 37 41

64 63 60 56 54 49 58

70 69 66 62 59 55 65

74 73 70 66 64 59 68

12.0

32 29 29 23 - - 24

44 41 41 35 29 30 36

50 46 46 41 35 36 41

54 51 51 45 39 40 48

42 37 37 35 36 31 39

54 48 48 47 47 43 50

59 54 54 52 53 48 56

63 57 58 56 56 52 59

58 56 53 49 46 41 58

70 68 64 60 58 53 60

76 74 70 67 64 59 68

79 77 73 69 67 62 70

29 27 27 21 - - 22

41 39 39 33 28 29 31

47 45 45 39 34 35 44

50 48 48 42 37 38 46

63 62 59 55 52 47 56

65 64 51 57 54 49 58

71 70 69 63 59 55 66

74 73 70 68 63 58 70

48 42 42 41 41 37 42

50 44 44 43 43 39 46

56 50 50 49 49 45 52

58 53 53 52 52 48 55

39 36 36 30 25 26 30

41 38 38 32 27 28 32

47 44 44 38 33 34 40

50 47 47 41 36 37 43

67 65 62 58 58 51 60

69 67 54 60 58 53 65

75 73 60 66 64 59 67

78 76 73 69 67 62 70

52 46 46 46 45 41 46

54 48 48 47 47 43 49

58 54 54 53 53 49 54

62 56 56 56 55 52 56

42 39 39 33 28 29 32

44 41 41 35 30 31 39

50 47 47 41 35 37 44

53 50 50 44 39 40 48

14.0

39 33 33 32 32 28 34

50 44 44 44 43 40 43

56 50 50 49 49 45 53

59 53 52 52 52 48 54

54 53 49 45 42 37 43

66 65 61 57 54 49 58

72 71 67 63 60 55 66

75 74 70 66 64 59 69

16.0

33 30 30 24 - - 22

45 42 42 36 30 31 34

51 48 48 44 36 37 44

54 51 51 45 39 40 48

43 37 36 36 36 32 36

54 48 48 47 47 43 47

60 54 54 53 53 49 55

63 56 56 56 55 52 57

51

204

357

505

83

332

581

826

132

528

924

1320

206

826

826

314

1445

1008

1764

2520

1257

2200

3143

2065

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Standard Electric Reheat Coil Selection

Recommended Installation Method


Order Size(inch)Airflow Range

6.0

8.0

10.0

12.0

Stages

14.0

16.0

100 - 945

170 -1675

245 - 2450

cmh

350 - 3475

500 - 4990

640 - 6320

1 , 2

1 , 2 , 3

1 , 2 , 3

1 , 2 , 3

1 , 2 , 3

1 , 2 , 3

120V

1 Phase

Allowable Maximum kW

5.0

5.5

5.5

5.5

5.5

5.5

240V6.0

9.5

11.5

11.5

11.5

11.5

277V6.0

11.0

13.0

13.0

13.0

13.0

208V

3 Phase

6.0

11.0

17.0

17.0

17.0

17.0

415V6.0

11.0

17.0

30.0

34.5

34.5

600V6.0

11.0

17.0

30.0

49.5

49.5

Installation Instructions:

1. The VAV terminals shall be installed at least two support brackets (One for the base unit , the other for accessories if any).

Each of these brackets shall be fixed with two threaded rods to the ceiling slabs above.

2. Recommended entry flow conditions as followed:

i) min 5D from main duct

ii) min 1D radius from secondary duct

3. Additional volume control dampers before the inlet are required/recommended.

4. All connections shall be thermally isolated.

5. Pressure sensing tubes of the flow sensor shall not be kinkedor otherwise obstructed by the external duct insulation.

min. 5D

Main Duct

Secondary Duct

min. 1D

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General

a. Variable Air Volume (VAV) terminals units shall be factory assembled, consisting of a sound reducing air chamber, round

inlet spigot, tight seal damper blade, and rectangular outlet for duct connection. VAV boxes shall be provided for areas as

indicated on the drawings and equipment schedule.

b. VAV boxes shall be rectangular or circular type, DDC (Direct Digitial Conrol) controlled pressure inependent designed for

c. VAV boxes shall be supplied complete with controllers, actuators and sensors by the VAV manufacturer to ensure single

source responsibility for the unit performance. VAV terminal units shall be LON, BACnet or standalone compatible.

controller and actuator, if not originally maufacturer by the VAV manufacturer shall be product of a single manufacturer

e. VAV units and wind tunnel performance data submitted shall be tested in accordance to ISO130-2008, ISO120-1999 or

equivalent. The manufacturers wind tunnel laboratory shall be available for viewing by relevant bodies upon request.

f. Factory calibration of VAV units to be done by manufacturer before delivering. The warranty of the complete unit including

the controls shall be the sole responsibility of the supplier.

Construction

a. VAV terminal units shall be supploed in 7 nominal sizes (6.0 , 8.0, 10.0 , 12.0 , 14.0 , 16.0 , 24.0 x 16.0). VAV manufacturer

b. Multi-outlet arrangements of A-Z shall be available upon customer request. The unit shall have proper opening with collar

upon customer request. Stainless steel construction shal be available upon customer request.

c. VAV casing shall be air-tight construction made of galvanized steel not less than 22 gauge (0.7 mm) with interal insulation of at least 25 mm thickness.

d. Damper balde shall be of no less than 1.6 mm thickness (double skin), with periperal tear resistant Neoprence lip seal to

ensure minimum leakageat a closed position. Damper shaft shall have damper position indicator to indicate the blades

current position. All control components shall be mounted inside a protective metal shroud attached to the VAV unit.

f. Access door shall be provided upon customer request. Access door shall be insulation to ensure minimum air leakage during

operation.

be arranged to ensure a true average measurement signal. Factory performance test shall be submitted to verify the

DDC Controller

a. The DDC controller shall be fully functional and shall be of the type that operates on open system concept (such as Lonworks

for ready interfacing and freely intergrating with the buildings Lon based Building Automation Syste BAS), without any. The

controller shall be capable of stand-alone and networking operation.

b. The integral damper actuator shall be minimm 5Nm torque, over the shaft mounting type. Stroke shall be fully adjustable from

0-94 Deg rotation with visible position indicator.

c. Integral transformer shall be provided for each VAV units to provide power supply for the controller.

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Technical Specifications


Performance

a. The static pressure drop across the VAV terminal units at maximum catalogue airflow shall not exceed 70 Pa. The

throttling range shall be from 100-10%.

b. Airflow sensors shall be capable of amplifying the velocity signal by at least 2.2 times to improve reading accuracy at low

air velocity.

c. Air leakage through the damper shal be within 2% tolerance at an inlet static pressure of 750 Pa of nomial air flow.

d. Independent of inlet pressure variations, VAV units shall modulate the delivered air volume between the specified

maximum and minimum air volume with accuracy of the flow performance within +/- 5% tolernace even with irregular

duct approach.

e. The noise level in the air-conditioned areas shall not exceed that as specified.

Documents

VAV_Box