Trane UH-PRC001-EN HotWater Selection Example, Selection Procedure, Step, Determine GPM, 95000 =

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HotWater Selection Example

Selection Procedure

Table SP-10 - Maximum Mounting Heights in Feet for Model P Unit Heaters with and without Louver Cone Diffuser

HotWater Selection Example

Selection Procedure

Unit

 

Steam Pressure (PSI)

Size

2

5

10

50

75

42-P

10.5

10.0

10.0

9.0

8.0

 

12.5

12.0

12.0

11.0

10.0

42-P LS*

8.0

8.0

8.0

8.0

8.0

 

9.0

8.5

8.5

8.0

8.0

42-P-L**

12.5

12.0

12.0

10.5

9.5

 

14.5

14.0

13.5

12.0

11.5

42-P-L LS

9.0

8.5

8.5

8.0

8.0

10.510.0 10.0 9.0 8.5

64-P 12.0 11.5 11.5 10.0 9.5

 

14.5

14.0

14.0

12.0

11.5

64-P LS

9. 5

9.0

9.0

8.0

8.0

11.511.0 11.0 9.5 9.0

64-P-L 15.0 14.5 14.5 12.5 12.0

19.018.5 18.5 16.5 16.0

64-P-L LS 11.5 11.0 11.0 9.5 8.0

14.013.5 13.5 12.0 11.5

80-P 15.0 14.5 14.0 12.0 4.5

 

18.5

18.0

17.5

15.5

13.5

80-P LS

11.0

10.5

10.5

9.0

8.5

13.513.0 13.0 11.5 11.0

80-P-L 18.0 17.5 17.5 15.0 14.0

22.021.0 21.0 19.0 18.0

80-P-L LS 13.0 12.5 12.0 11.0 10.5

17.016.5 16.0 14.0 13.5

102-P 14.0 13.5 13.0 11.5 11.0

 

17.0

16.5

16.0

14.0

13.5

102-P LS

11.0

10.5

10.5

9.5

9.0

13.513.0 13.0 12.0 11.5

102-P-L 17.5 17.0 16.5 15.0 14.5

21.521.0 20.5 18.5 17.5 102-P-L LS 15.0 14.5 14.5 13.0 12.5

18.518.0 18.0 16.0 15.0

122-P 16.0 15.5 15.5 14.0 13.5

19.519.0 18.5 17.0 16.0

122-P-L 21.0 20.5 20.0 17.5 17.0

26.025.5 25.0 22.5 21.5

146-P 15.5 15.0 14.5 13.0 12.0

19.018.5 18.0 16.0 15.5

Unit

 

Steam Pressure (PSI)

Size

2

5

10

50

75

146-P-L

18.0

17.5

17.5

15.0

14.0

22.522.0 21.5 18.5 18.0

166-P 18.0 17.5 17.0 14.5 14.0

22.522.0 21.5 19.0 18.0

166-P-L 22.0 21.5 21.0 18.5 17.5

27.527.0 26.5 23.5 22.5

202-P 22.0 21.5 21.0 18.5 17.5

27.527.0 26.5 24.0 23.0

202-P-L 25.5 250 24.5 22.0 21.0

31.531.0 30.5 27.0 26.0

252-P 20.0 19.5 19.0 17.0 16.0

25.024.0 23.5 20.5 19.5

252-P-L 24.0 23.5 23.0 20.0 19.0

29.528.5 28.0 24.5 23.5

280-P 21.0 20.5 20.0 17.5 17.0

26.025.5 25.0 22.0 21.0

280-P-L 25.5 25.0 24.5 21.0 20.0

32.031.0 30.0 26.0 25.0

336-P 24.0 23.0 22.0 20.0 19.0

30.029.0 28.0 25.0 24.0

336-P-L 29.0 28.5 28.0 25.0 24.0

36.035.0 34.0 30.0 29.0

384-P 28.5 28.0 27.5 24.0 23.0

35.535.0 34.0 30.0 29.0

384-P-L 32.5 31.5 30.5 27.5 26.5

41.040.0 39.0 35.0 33.5

500-P 29.5 29.0 28.5 25.0 24.0

36.536.0 35.5 32.0 30.5

500-P-L 35.0 34.0 33.0 29.0 28.0

43.542.5 41.5 35.0 34.0

600-P 34.0 33.0 32.0 28.0 27.0

42.541.5 40.5 36.0 34.5

600-P-L 37.0 36.0 35.0 31.0 30.0

46.545.5 44.5 39.0 37.0

720-P 38.5 37.5 36.5 32.0 30.5

48.047.0 46.0 40.0 39.0

720-P-L 42.5 41.5 40.5 35.0 33.5

53.052.0 51.0 44.0 42.0

Select the proper size of unit heater for whatever application desired, as illustrated by the following examples.

Example 1:

Select a Model S horizontal unit heater to deliver 95 MBH with 220°F entering water temperature (EWT), 70°F entering air temperature (EAT) and a 30°F water temperature drop (WTD).

Step 1.

 

 

Determine GPM:

 

 

GPM = Btu/hr =
95000 = 6.53

 

 

 

 

 

 

(485)WTD
485 x 30

Step 2.

Refer toTable SP-11 to select the conversion factor at 220° EWT and 70° EAT. Factor is 1.058.

Step 3.

Determine equivalent MBH at standard conditions (200° EWT, 60° EAT).

Equiv. MBH = MBH = 95 = 89.8 Factor 1.058

Step 4.

Select unit size by entering the hot water tables at the 200 °F EWT column. Select

Notes:

*LS = Low speed.

**PL = Model P low final temperature model with all air ports open.

Figures in bold face show maximum mounting height with louver cone diffusers set vertically.

To meet CSA and OSHA requirements, Model P Unit Heaters mounted lower than 8.0 ft. from the floor must be equipped with an OSHA fan guard. Above table based on 60 F entering air temperature. In providing for the use of diffusers, it must be remembered that adjustment of a LCD to deflect air toward horizontal immediately lowers the mounting height limit.

the unit which will provide 89.8 MBH at

6.53GPM. In this example, the selection indicates a Model S 126W2 unit heater, fromTable PD-2, page 28.

To determine the actual capacity of this Model S 126W2 at operating conditions (220° EWT and 70° EAT) proceed as follows.

Step 1.

Determine the MBH at 6.53 GPM by interpolation in the 200° column. (In this case 90.8 MBH.) Multiply this MBH by the conversion factor 90.8 MBH x 1.058 = 96 MBH.

Step 2.

The GPM remains constant = 6.53 GPM.

Step 3.

Calculate the water temperature drop

WTD = Btu/hr =

96000 = 30.3

 

 

 

 

 

 

 

GPM x 485

(6.53) (485)

UH-PRC001-EN

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Contents October UH-PRC001-ENPropeller Unit Heaters/Unitary 17.4 to 705.6 MBhThe Industrial Designed Model P Unit Heater IntroductionElectric Power ContentsFeatures and Benefits Selection ProcedurePut HeatWhere It’s Needed Features and BenefitsRectangular Draw-ThruCoils The Model S CoilThe Model P Motor Compact DesignModel S Model PFeatures and Benefits Features and Benefits External CouplingsGeneral Rules Application ConsiderationsTypical Factory General Notes HotWater System - Using Circulating PumpApplication Considerations Figure AC-4 Figure AC-5 Figure AC-6 Vapor orVacuum SystemHotWater System with Circulating Pump Application ConsiderationsType of Building Selection ProcedureTrane Propeller Unit Heaters BTU RequirementsEquivalent Direct Radiation FormulaDetermining Special Steam Capacities Useful DataD BE Model S NomenclatureSelection Procedure Table Based on 2 PSIG and 60 F Entering Air Model SModel P Selection Procedure2 Lbs. Steam 60 F Entering AirTemp Selection Procedure2 Lbs. Steam 60 F Entering AirTemp Selection ProcedureTable SP-6- Maximum Spread Ft Selection ProcedureSelection Procedure Additional Selection DataModel P Nomenclature Motor and Fan SpeedsStep Selection ProcedureHotWater Selection Example Selection ProcedureGlycol Correction Factors for Propylene Glycol/WaterPropylene Glycol PropyleneMODEL P UNIT HEATER Model Number DescriptionMotors Model Number Description D B EMotors Performance Data Water Performance DataWater Performance DataWater Performance DataEntering WaterTemperature Performance DataEntering WaterTemperature Performance Data117.6 Performance DataEntering WaterTemperature Performance DataEntering WaterTemperature Performance DataWater Performance DataWater Performance DataWater Performance Data115.1 Performance DataWater Performance DataWater Performance DataEntering WaterTemperature Performance DataEntering WaterTemperature Performance DataEntering WaterTemperature Performance Data100.1 Performance DataEntering WaterTemperature Performance DataEntering WaterTemperature Performance DataElectric Power Accessory Electric PowerModel Electric PowerMotor MountType-2 Dimensions and WeightsFigure DW-1 Motor MountType-1Figure DW-2 Dimensions and WeightsTable DW-4- Louver Cone Diffuser Roughing Dimensions and WeightsIn Dimensions Figure DW-4 Figure DW-3Model S General Mechanical SpecificationsModel P General CasingPage TheTrane Company NRTL/C
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