Trane manual Motor and Drive Selection, Parallel Fan Operation, Table A-4 Parallel Operation

Page 18

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

Image 18
Contents FAN-DS-2 August Model Q Fans Sizes 16 through Super Q II FansFeatures and Benefits Contents Features Benefits Trane Model Q fans require up toSuper Q II Fan Variable Air Volume CompatibleSuper Q II Accessories Super QTrane Plus Duct Silencer Plus SilencerStatic regain Airflow Aerodynamic Air Path This provides smooth, spiral-free dischargeFeatures Benefits Saving Valuable Equipment Room Space Draw-Thru Supply Application Small CapacityDraw-Thru Supply Application Large Capacity Figure F-5Table F-1 Total Installed Cost Comparison Features Benefits Reduce Installed Cost By UpTo 20 PercentLower Installation Costs First Cost ComparisonsModel Number Description Valid Select Prod Able Cat DescriptionValid Select Prod Able Prod. able Cat Description Application Considerations AbbreviationsSystem System Curve Performance Data Determination Fan Performance CurvesUnducted Plenum Inlet Unducted Outlet Table A-1 Q Fan/Super Q II Fan Installation Kt CorrectionsFan Option Kt Corrections Ducted Inlet Ducted OutletSuper Q II Fan Modulation AC Inverter Capacity Control Figure A-5 VAV System Modulation CurveFigure A-6 Inlet Vane Performance Table A-3 Maximum Torque For Operation Of InletVanes Motor and Drive SelectionParallel Fan Operation Table A-4 Parallel OperationRecommended Super Q II NC40 Plenum Configuration Operating Cost/EfficiencyFan Sound Data Trane Acoustics ProgramTable A-5 Inlet Vane Sound Data Selection Procedure Table S-1 Short Plus Silencer Attenuation 1D LengthTable S-2 Long Plus Silencer Attenuation 2D Length Fan Size PerformanceData Minimum Fan RPM Without Vfrb OptionPerformance Fan Data Super Q Size Minimum and Maximum Motor HP RangesTable P-2 Size 19 Q Fan Performance Fan Data Super Q Size Table P-3 Size 21 Q-Fan Performance Fan Data Super Q Size Table P-4 Size 24 Q-Fan Arrangement 15-30 Table P-5 Size 27 Q-Fan Arrangement Table P-6 Size 30 Q-Fan Performance Fan Data Super Q Size Table P-7 Size 33 Q-Fan Performance Fan Data Super Q Size Table P-8 Size 36 Q-Fan Performance Fan Data Super Q Size Table P-9 Size 40 Q Fan Performance Fan Data Super Q Size Table P-10 Size 44 Q-Fan Performance Fan Data Super Q Size Minimum Fan RPM Without Vfrb Option Fan Table P-12 Size 54 Q-Fan Fan Table P-13 Size 60 Q-Fan Fan Dimensional Data Weights Arrangement 9 Dimensions OutArrangement Arrangement 1 Dimensions Out Arrangement1Arrangement 9 Dimensions Dimensional Figure D-1 Q Fan Inlet Vanes Table D-1 Inlet Vane DimensionsFigure D-3 Super Q II 16-44 Sizes Table D-3 Table D-5 Long Outlet Plus Silencer Mechanical Specifications Inlet Bellmouth Q, SQ2 Adjustable Inlet VanesInlet Screen Q, SQ2 Inlet Flange QFAN-DS-2

Fan specifications

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