Trane Modular 20 to 35 Tons Parts List Page 17
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PKG-PRC003U-EN 17
Selection Procedure
Following is a sample selection for a standard applied water-cooled self-contained at particular
operating conditions. UseTrane Official Product Selection System,TOPSS™, for making all final
selections or contact your localTrane sales office.
Unit Capacities
1. Determine entering air temperature dry bulb and wet bulb and entering water temperature.
2. Refer to performance Table 7, p . 30 through Table 19, p. 41 to find gross total and sensible
capacity that best meets capacity requirements.
3. Apply the cfm correction factors from the capacity correction factor Table 6, p. 29 to determine
gross total and gross sensible capacities at desired cfm.
4. Multiply condenser water deltaT by the total capacity cfm correction factor to determine new
condenser water deltaT.
5. Using design cfm, determine static air pressure drops for accessories from the air pressure
drop
Figure 6, p. 25 through Figure 11 , p . 27. Add accessory static pressure drops to external
supply and return static air pressure drops. Use the total air pressure drop to determine rpm
and brake horsepower requirements from the appropriate fan curve. Note:The fan curves
include refrigerant coil and internal cabinet static loses.
6. Calculate supply fan motor heat by using the following equation:
Fan motor heat (MBh) = 2.8 x fan motor brake horsepower
7. Determine net total capacity and net sensible capacity by subtracting fan motor heat from gross
total capacity and gross sensible capacity.
8. Refer to theTrane psychometric chart to determine leaving air temperatures.
Waterside Economizer Capacity
1. After determining that the unit will meet the required mechanical cooling capacity, determine
the waterside economizer capacity by referring to the appropriate two-row (low capacity) or
four-row (high capacity) waterside economizer capacity tables for the unit size.
2. Determine entering air temperature dry bulb and wet bulb, condenser water flow (gpm), and
economizer entering water temperature.
3. Refer to the appropriate waterside economizer table to find gross total and sensible capacity
and the leaving water temperature.
4. Apply the cfm correction factor for the waterside economizer from the appropriate table to
determine the gross total and sensible capacities at the desired cfm.
5. Multiply the condenser water deltaT by the total capacity cfm correction factor to determine
the new deltaT.
6. Calculate supply fan motor heat by using the following equation:
Fan motor heat (MBh) = 2.8 x fan motor brake horsepower
7. Determine net total and sensible capacity by subtracting fan motor heat from gross total and
sensible capacity.
8. Refer to theTrane psychometric chart to determine leaving air temperatures.
Selection Example
Design Conditions
Total gross capacity required = 368.7 MBh = 31Tons
Total sensible capacity required = 259 MBh
Entering air temperature = 80/67°F
Entering water temperature = 85
gpm = 105
- Product Catalog 1
- Introduction 2
- Table of Contents 3
- 6 PKG-PRC003U-EN 6
- Enhanced Serviceability 7
- Standard Features 7
- Standard Control Features 7
- Optional Features 8
- Field Installed Accessories 8
- Features and Benefits 10
- Interoperability with BACnet 10
- LowTorque Variation 11
- Suction Gas Cooled Motor 11
- Application Considerations 12
- Isolation Recommendations 14
- Condenser Water Piping 15
- 16 PKG-PRC003U-EN 16
- Selection Procedure 17
- Unit Selection 18
- Model Number Descriptions 19
- Self-Contained Ship 21
- With Accessory 21
- Model Number 21
- Remote Air-Cooled 21
- Condenser 21
- General Data 22
- Performance Data 25
- Waterside Pressure Drop 28
- Water-Cooled Unit Performance 30
- 25-ton Water-Cooled 32
- 30-ton Water-Cooled 34
- 35-ton Water-Cooled 36
- Air-Cooled Unit Performance 38
- 25-ton Air-Cooled 39
- 32-ton Air-Cooled 40
- Heating Performance 41
- Controls 42
- Analog inputs 43
- Binary inputs 43
- Binary output 43
- Human Interface Panel (HI) 44
- Morning Warmup 45
- Ventilation Override (VOM) 45
- Demand Limiting Binary Input 47
- 48 PKG-PRC003U-EN 48
- Airside Options 49
- Cooling/Airside Economizer 50
- Heating: Electric 50
- Supply Air Tempering 50
- PKG-PRC003U-EN 51 51
- 52 PKG-PRC003U-EN 52
- Zone Sensor Options 53
- CV: BAYSENS108 54
- CV: BAYSENS110 54
- BAYSENS074 55
- BAYSENS073 55
- Electrical Data 56
- Dimensions and Weights 59
- DETAIL A 71
- DETAIL B 71
- MOUNTING BASE 71
- SEE DETAIL A 71
- DETAIL A 75
- DETAIL B 75
- Service Clearances 78
- Mechanical Specifications 79
- 80 PKG-PRC003U-EN 80
- IntelliPak™ Control Options 81
- Comparative Enthalpy Control 82
- Airside Economizer Interface 82
- PKG-PRC003U-EN 83 83
- 84 PKG-PRC003U-EN 84
- PKG-PRC003U-EN 85 85
- 86 PKG-PRC003U-EN 86
- Protective Coating Option 87
- Low Ambient Damper Option 87
- Louvered Coil Guards Option 87
- Agency Listing 87
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