Application Considerations

Table A-3 — Maximum Torque For

Operation Of InletVanes

 

 

 

 

Control

Opening

Closing

 

 

 

 

Arm

Torque

Torque

 

 

Size

Class

(In.)

(In.-Lb)

(In.-Lb)

 

 

 

1

 

8

7

 

 

16

2

8.75

14

13

 

 

 

3

 

23

22

 

 

 

1

 

12

11

 

 

19

2

8.75

21

19

 

 

 

3

 

34

31

 

 

 

1

 

17

15

 

 

21

2

8.75

31

26

 

 

 

3

 

32

44

 

 

 

1

 

26

20

 

 

24

2

8.75

48

36

 

 

 

3

 

79

61

 

 

 

1

 

37

27

 

 

27

2

8.75

66

48

 

 

 

3

 

109

79

 

 

 

1

 

52

35

 

 

30

2

8.75

94

63

Table A-4 defines this constant system curve as a percent of wide- open cfm. If fans in parallel are always operated to the right of this constant system curve, fan paralleling will not occur.

Table A-4 — Parallel Operation

 

Minimum % of WOCFM

 

ForTwo Model Q Fans

Fan Size

In Parallel

16

80% WOCFM

19-21

81% WOCFM

24-30

83% WOCFM

33-44

73% WOCFM

49-60

85% WOCFM

Motor and Drive Selection

The Model Q fan has been designed for use with NEMA “T” Frame

motors. Motor hp limits for Class I, II, and III construction are listed in the roughing-in Dimensional Data section of this catalog.

Minimizing belt tension forces increases bearing life and reduces fan noise. The Q fan and Super Q II fan drive selection is totally computerized by the factory to achieve quiet, long life operation. IfTrane provides Q fan drives, all fan motor information must be made available to theTrane sales engineer.

 

3

 

155

104

 

1

 

65

41

33

2

8.75

128

81

 

3

 

212

134

 

1

 

100

59

36

2

10.81

180

106

 

3

 

298

175

 

1

 

138

75

40

2

10.81

249

136

 

3

 

412

225

 

1

 

193

99

44

2

10.81

349

179

 

3

 

576

295

Parallel Fan Operation

The Q fan performance curve has a characteristic shape where two different cfm’s are possible at the same static pressure. Therefore, when selecting fans for multiple installation connected with either a common inlet, a common discharge or both, care must be taken to eliminate the possibility of fan paralleling.

Figure A-7 shows two typical cfm-sp performance curves for the Q fan. Fan paralleling can occur when multiple fans are selected in the shaded area.

The shaded area is determined by going straight across from the lowest point of the fan performance curve at the left of the surge line (A and A1) to the same curve to the right of the surge line (B and B1). Points B and B1 fall on a constant system curve.

Figure A-7 — Selecting Model Q Fans in Parallel

Recommended Q Fan Configuration Inside an Air Handler

Side View

18

Page 18
Image 18
Trane manual Motor and Drive Selection, Parallel Fan Operation, Table A-3 Maximum Torque For Operation Of InletVanes

Fan specifications

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