Trane Modular 20 to 35 Tons Liste des pièces Page 14
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14 PKG-PRC003U-EN
Application Considerations
Equipment Options
The flexible horizontal discharge plenum allows multiple tested outlet options.This minimizes the
risk of acoustic and/or pressure drop problems by avoiding complex transitions close to the fan
discharge.
Static Pressure Versus Acoustics
Design the system to minimize the total static pressure required from the self-contained unit fan.
Typically a change in static pressure of only 0.5 inches can reduce NC level by approximately 2 or
3 in the occupied space.
Free Cooling Opportunities and Alternatives
Free cooling is available with either airside or waterside economizers.The advantages and
disadvantages of each type are listed as follows:
Waterside Economizer
The waterside economizer substantially reduces the compressor energy requirements because it
uses the cooling water before it enters the condensers. Additional equipment room space is not
required since the coils are contained within the overall unit dimensions.
Disadvantages include higher airside pressure drop and a higher head on condenser water pumps.
The coils may be mechanically cleanable (optional) for ease in maintenance versus expensive and
difficult chemical cleaning methods.
Airside Economizer
The airside economizer substantially reduces compressor, cooling tower, and condenser water
pump energy requirements using outside air for free cooling. It also reduces tower make up water
needs and related water treatment.
Disadvantages include building requirements that locate the mechanical room and self-contained
unit toward an exterior wall to minimize ductwork, building barometric control, or additional air
shafts. Also, airside economizers require additional mechanical room space.
Isolation Recommendations
Unit
The Modular Series unit is internally isolated so that external isolation is not required. Consult a
vibration specialist before using external isolation.TheTrane Company does not recommend
double isolation. If isolation external to the unit is preferred, remove internal isolators.
Ductwork
Design duct connections to the unit using a flexible material. Consult local codes for approved
flexible duct material to prevent fire hazard potential.
Piping Connections
Rubber isolator connectors are recommended for condenser piping to prevent vibration
transmission to or from the building plumbing.The Modular Series self-contained unit is internally
isolated and does not require additional isolation. However, do not forget to design proper system
vibration isolation to prevent vibration transmission from the building plumbing to the unit. Also
be sure that the drain line is properly isolated.
- 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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