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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
50 PKG-PRC003U-EN
Controls
“free cooling,” the economizer initiates to attempt to satisfy the cooling zone temperature setpoint
with the compressors staging on as necessary. Minimum on/off timing of compressors prevents
rapid cycling.
Waterside economizing enables when the unit’s entering water temperature is below the unit’s
entering mixed air temperature by a minimum of 4°F plus the economizer’s approach temperature.
The approach temperature default is 4°F and is adjustable from 0-9°F. Waterside economizing
disables when the unit’s entering water temperature is not below the unit’s entering mixed air
temperature by at least the water economizer approach temperature.The approach temperature
defaults to 4°F and is adjustable from 0 to 9°F.The economizer acts as the first stage of cooling. If
the economizer is unable to maintain the zone temperature setpoint, the compressor module will
bring on compressors as required to meet the setpoint.
If the unit does not include an economizer, only mechanical cooling will satisfy cooling
requirements.
Cooling/Airside Economizer
During occupied cooling mode, the economizer option and mechanical cooling operate to control
zone temperature. If the outside air enthalpy is appropriate for airside economizing or “free
cooling,” the economizer initiates to satisfy the cooling zone temperature setpoint with the
compressors staging on as necessary. Minimum on/off timing of compressors will prevent rapid
cycling.
On units with an airside economizer, a call for cooling will modulate the fresh air dampers open.
The rate of economizer modulation is based on deviation of the zone temperature from setpoint,
i.e., the further away from setpoint, the faster the fresh air damper will open. First stage of cooling
will start after the economizer reaches full open.
Note that the airside economizer is only allowed to function freely if ambient conditions are below
the enthalpy control settings or below the return air enthalpy if unit has comparative enthalpy
installed. If outside air is not suitable for “economizing,” the fresh air dampers drive to the
minimum open position. A field adjustable, factory default setting in the human interface panel or
Tracer Summit can provide the input to establish the minimum damper position.
At outdoor air conditions above the enthalpy control setting, only mechanical cooling is used and
the fresh air dampers remain at minimum position.
If the unit does not include an airside economizer, only mechanical cooling is used to satisfy cooling
requirements.
Heating: Electric
On units with electric heating, the zone temperature can be controlled to a heating setpoint during
the occupied mode by cycling a single stage electric heater. Interface is provided for field supplied
single stage electric heat.The zone temperature heating setpoint and deadband are user defined
at the human interface panel.
Heating: Hot Water or Steam
On units with hot water or steam heating, the zone temperature can be controlled to a heating
setpoint during the occupied mode.The zone temperature heating setpoint and deadband are user
defined at the human interface panel.
Supply Air Tempering
For hot water, steam, or electric heat units in the heat mode but not actively heating, if the supply
air temperature drops to 10°F below the occupied zone heating temperature setpoint, one stage of
heat will be brought on to maintain a minimum supply air temperature.The unit transitions out of
heat mode if the supply air temperature rises to 10°F above the occupied zone heating temperature
setpoint.
- 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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