Trace 3D Plus
User Guide
 
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System Configuration Screen
After the air path pattern has been chosen, the system configuration screen appears. The airpath is populated with dampers and the demand box. The demand box represents one zone on the system. In order to populate the air path with the rest of the required components, the components box at the top of the screen should be selected. When selected, it will expand to show all available fans, coils, etc. that can be added. The user will click on a specific component and green buttons will appear on the air path diagram where that component can be placed. The user can click on an individual green dot to place the component. The same is true for the Airterminal Devices, Zone Level Equipment, and Controls and Sensors.    
 
 
 
 
 
Components
 
Clicking the Components button will expand the list of available components for the system type being created. Only available components will be populated in the components list. Components include fans, coils, heat pumps, energy recovery, unitary pieces of equipment, humidifiers, and heat exchangers.
In order to apply a specific component to the air path, you should click the component. When the component is selected, the diagram will indicate where the component can be placed with green buttons. If no green buttons appear, the component can’t be placed on the diagram. If a component is not compatible with the current system configuration, it will be greyed out. 
Components can be arranged in different configurations to achieve different effects. For example, the supply fan can be placed before the cooling coil to create a blow through configuration or it can be placed after the cooling coil to create a draw through configuration. 
 
 
 
Supply Fan
The Supply Fan is used to represent any type of constant volume fan that moves supply air in the system. 
 
Library Type - Equipment Library - Fans - Constant Volume
 
Placement Rules: This fan can be placed in either the outside air path or the supply air path depending on system type. When the fan is placed in the outdoor air path, it will move the outdoor air. If the fan is in the supply air path, it will move both the mixed return and outdoor air. There can be a supply fan in both the outdoor air path and the supply air path.
 
 
Supply Fan VFD
The Supply Fan VFD is used to represent any type of variable volume fan that moves supply air in the system. 
 
Library Type - Equipment Library - Fans - Variable Volume
 
Placement Rules: This fan can be placed in either the outside air path or the supply air path depending on system type. When the fan is placed in the outdoor air path, it will move the outdoor air. If the fan is placed in the supply air path, it will move both the mixed return and outdoor air. There can be a supply fan VFD in both the outdoor air path and the supply air path.
 
 
Return Fan
The Return Fan is used to represent any type of constant volume fan that moves return air from the system. 
 
Library Type - Equipment Library - Fans - Constant Volume
 
Placement Rules: The Return Fan can be placed in the return air path or the exhaust air path depending on system type. When it is placed in the exhaust air path, it is used to remove air from the system and displace it outside. When the fan is placed in the return air path, it is used to move both the return air that will circulate back into the system as well as the exhaust air that is removed from the system. 
 
 
Return Fan VFD
The Return Fan VFD is used to represent any type of variable volume fan that moves return air from the system.
 
Library Type - Equipment Library - Fans - Variable Volume
 
Placement Rules: The Return Fan VFD can be placed in the return air path or the exhaust air path depending on system type. When it is placed in the exhaust air path, it is used to remove air from the system and displace it outside. When the fan is placed in the return air path, it is used to move both the return air that will circulate back into the system as well as the exhaust air that is removed from the system. 
 
 
Cooling Coil
The cooling coil can be a chilled water coil or a DX cooling coil that is used to remove both sensible and latent energy to decrease the temperature and humidity of the supply air before it enters the space. 
 
Library Type - Equipment - Cooling Coils - Water (Simple)
Equipment - Cooling Coils - Water (Detailed)
Equipment - DX Cooling Equipment - DX Cooling Equipment
 
Placement Rules: The cooling coil may be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
  
Heating Coil
The heating coil can be electric, hot water, gas, steam, multistage electric or multistage gas. The heating coil is used to add sensible energy to increase the temperature of the supply air before it enters the space. 
 
Library Type -  Equipment -  Heating Coil -  Electric
Equipment -  Heating Coil -  Hot Water
Equipment -  Heating Coil -  Gas
Equipment -  Heating Coil -  Steam
Equipment -  Heating Coil -  Multistage Electric
Equipment -  Heating Coil -  Multistage Gas
 
Placement Rules: The heating coil may be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
 
 
Air to Air Heat Pump
The Air to Air Heat Pump represents an air to air heat pump system that would be found in a custom air handler. 
 
Library Type - Equipment - Heat Pumps - Air to Air Heat Pump
 
Placement Rules: The air to air heat pump can be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
 
 
Central Air to Air Heat Pump Unit
The central air to air heat pump represents a unitary packaged air to air heat pump component. 
 
Library Type - Equipment - Packaged DX - Central Air to Air HP Unit
 
Placement Rules: The central air to air heat pump can be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
  
Central WSHP Unit
The central water source heat pump represents a unitary water source heat pump piece of equipment.
 
Library Type - Equipment - Packaged DX - Central WSHP Unit
 
Placement Rules: The central water source heat pump can be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
 
 
Heat Exchanger
The Heat Exchanger is used to transfer heat between two different air streams in the system. The supply side will use either the outdoor air or the supply air path. The exhaust side will always use the exhaust air path. Depending on the type of heat exchanger that is used, it can transfer either sensible energy (flat plate or sensible and latent: sensible only), latent energy (sensible and latent: latent only), or sensible and latent (desiccant or sensible and latent).
 
Library Type - Equipment - Heat Exchangers - Flat Plate
Equipment - Heat Exchangers - Desiccant
Equipment - Heat Exchangers - Sensible and Latent
 
Placement Rules: The Heat Exchanger can be placed in either the outdoor air path or the supply air path. A heat exchanger can be placed in both the outdoor air and supply air paths simultaneously. When the heat exchanger is placed in either the outdoor air or supply air paths, the exhaust air path will automatically be connected to the other side of the heat exchanger.
 
 
 
Series ERD
This component contains both a cooling coil (either DX or chilled water) and an air to air heat exchanger. The heat exchanger is used to precool the air before it enters the cooling coil and reheat that air after it leaves the cooling coil for dehumidification. 
 
Library Type - Equipment - Cooling Coils - Water (Simple)
Equipment - Cooling Coils - Water (Detailed)
Equipment - DX Cooling Equipment - DX Cooling Equipment
 
Equipment - Heat Exchangers - Flat Plate
Equipment - Heat Exchangers - Desiccant
Equipment - Heat Exchangers - Sensible and Latent
 
Placement Rules: This component can be placed in either the outside air or supply air path.
  
Changeover Bypass VAV
This is a unitary piece of equipment that includes a supply fan, DX cooling coil, heating coil, and an outdoor air mixer. The fan is constant volume but VAV dampers at each zone allow for a variable supply airflow. Any air not delivered to a space is recirculated to the main unit.
 
Library Type - Equipment - Packaged DX - Changeover-Bypass VAV
 
Placement Rules: The VAV (heat cool VAV bypass) can be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
 
 
Packaged DX
The Packaged DX component represents a packaged unit that contains a fan, cooling coil, and heating coil. The specific fan, cooling coil, and heating coil library members are designated in the equipment library for the unitary library member. Preheat and reheat coils can be added separately to the system using the appropriate heating coil and terminal device coil respectively.
 
Library Type - Equipment - Packaged DX - Packaged Cooling and Heating
Equipment - Packaged DX - Packaged Cooling and Heating (Water)
 
Placement Rules: The Unitary Heat Cool component can only be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
 
 
Packaged Heating Only
The packaged heating only component represents a packaged unit that contains a fan and heating coil. The specific fan and heating coil library members are designated in the equipment library for the unitary library member. Preheat and reheat coils can be added separately to the system using the appropriate heating coil and terminal device coil respectively. This component is only available in the Heating Only system category.
 
Library Type - Equipment - Packaged DX - Packaged Heating Only
 
Placement Rules: The Unitary Heat component can only be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
  
Packaged Cooling Only
The packaged cooling only component represents a packaged unit that contains a fan and cooling coil. The specific fan and cooling coil library members are designated in the equipment library for the unitary library member. This component is only available in the Cooling Only system category and as such, preheat and reheat coils will not be available to add to the system. 
 
Library Type - Equipment - Packaged DX - Packaged Cooling Only
Equipment - Packaged DX - Packaged Cooling (Water)
 
Placement Rules: The Unitary Cool component can only be placed in the supply air path. Note, coils may not be placed in the outdoor air path. A separate DOA should be created and assigned to the system at the project level in order to condition outside air separately.
 
 
Humidifier
The humidifier heats water using either electricity or gas in order to create steam that is incorporated into the supply air using a fan to increase the humidity of the supply air. 
 
Library Type - Equipment - Humidifiers - Electric Steam Humidifier
Equipment - Humidifiers - Gas Steam Humidifier
 
Placement Rules: The humidifier can only be added to the supply air path. It can be added either before or after other heating and cooling coils. 
 
 
Direct Evaporative Cooler
The Direct Evaporative Cooler is used to precool supply air by evaporating water directly in the supply air stream. This decreases the sensible energy of the supply air but increases the latent energy. 
 
Library Type - Equipment - Cooling Coils - Direct Evaporative Cooler
 
Placement Rules: The direct evaporative cooler can only be placed in the supply air path and can be placed before and after other coils. 
 
 
Indirect Evaporative Cooler
The Indirect Evaporative Cooler is used to precool air with evaporating water without adding moisture to the air stream. Air is cooled by evaporating water and that air transfers heat with the supply air stream through an air to air heat exchanger. This decreases the sensible energy of the supply air without increasing the latent energy. 
 
Library Type - Equipment - Cooling Coils - Indirect Evaporative Cooler
 
Placement Rules: The indirect evaporative cooler can only be placed in the supply air path and can be placed before and after other coils.
 
 
 
 
Terminal Devices
Clicking the Terminal Devices button will expand the list of terminal devices available for the system type that is being created.  Only available terminal devices will be populated in the terminal devices list.  For example, VAV boxes will not be available in the Constant Volume system category. 
 
One and only one type of terminal device must be selected for each system library.  Some systems use multiple types of terminal devices such as a fan powered boxes on some zones and shutoff boxes on others.  In this case, the most common terminal device should be used when creating the system library.  Terminal boxes can be changed on a zone by zone basis at the project level. 
 
All systems are required to have a terminal device.  Constant volume systems don’t always have a physical terminal device.  In this case, the Diffuser terminal device should be used.  This simply represents a terminal box with no VAV damper, fan, or reheat coil.
 
 
 
Diffuser
The Diffuser represents a diffuser into a zone that has no VAV damper, fan, or coil. 
 
Library Type:  N/A
 
Placement Rules:  Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
CV Terminal Reheat
The Constant Volume with reheat terminal device is used in constant volume systems in order to reheat the supply air before it enters the zone.
 
Library Type:  Equipment:  Heating Coil:  Electric
Equipment:  Heating Coil:  Hot Water
Equipment:  Heating Coil:  Gas
Equipment:  Heating Coil:  Steam
 
Placement Rules:  Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
VAV Terminal
The VAV Terminal is used to control the supply air of a VAV system using a VAV damper but has no coil or fan. 
 
Library Type:  N/A
 
Placement Rules:  Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
VAV w/Reheat
The VAV with reheat terminal device is used to control the supply air of a VAV system using a VAV damper. The terminal box also contains a reheat coil to heat supply air before it enters the space. 
 
Library Type:  Equipment:  Heating Coil:  Electric
Equipment:  Heating Coil:  Hot Water
Equipment:  Heating Coil:  Gas
Equipment:  Heating Coil:  Steam
 
Placement Rules: Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
VAV Fan Assisted Reheat
The VAV with fan assisted reheat terminal box contains a VAV damper to control airflow into the space as well as a heating coil in series with a variable speed fan. The fan controls the amount of supply air entering the zone and is commonly found in UFAD systems.   
 
Library Type:  Heating Coil:  Electric
Equipment:  Heating Coil:  Hot Water
Equipment:  Heating Coil:  Gas
Equipment:  Heating Coil:  Steam
Equipment:  Fan:  Variable Volume
 
Placement Rules: Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
Parallel Fan Powered VAV
The parallel fan powered VAV boxes contain a VAV damper to control airflow into the zone as well as a heating coil in parallel with a constant volume fan that recirculates air from the zone. Only the recirculated air passes through the fan but both the recirculated and supply air passes through the heating coil. The air entering the zone is equal to the sum of the supply air and the recirculated air. 
 
Library Type:  Heating Coil:  Electric
Equipment:  Heating Coil:  Hot Water
Equipment:  Heating Coil:  Gas
Equipment:  Heating Coil:  Steam
Equipment:  Fan:  Constant Volume
 
Placement Rules: Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
Series Fan Powered VAV
The series fan powered VAV boxes contain a VAV damper to control airflow into the zone as well as a heating coil in series with a constant volume fan that recirculates air from the zone. Both the recirculated and supply air pass through the fan and the reheat coil. The air entering the zone is equal to the sum of the supply air and the recirculated air. 
 
Library Type:  Heating Coil:  Electric
Equipment:  Heating Coil:  Hot Water
Equipment:  Heating Coil:  Gas
Equipment:  Heating Coil:  Steam
Equipment:  Fan:  Constant Volume
 
Placement Rules: Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
Dual Duct CV
The dual duct constant volume terminal device is only available in the Dual Duct system category.  Dual duct systems have separate air paths for hot and cold air.  These air streams are mixed in this terminal device in order to adequately condition the space.  Different proportions of the hot and cold air may be mixed but the sum of the airflows will be constant.
 
Library Type:  N/A
 
Placement Rules:  Terminal devices are placed in the supply air path directly before the demand box. 
Link to properties
 
 
Dual Duct VAV
The Dual Duct VAV terminal device is only available in the Dual Duct system category. Dual duct systems have separate air paths for hot and cold air. These air streams are mixed in this terminal device in order to adequately condition the space. Different proportions of the hot and cold air may be mixed and the total supply airflow may vary.
 
Library Type: N/A
 
Placement Rules: Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
Four Pipe Induction
The Four Pipe Induction terminal device comes with a water cooling coil and water heating coil. Centrally conditioned air is forced through this terminal unit through a nozzle, inducing room air to flow over these terminal coils. The unit has two inlets and two outlets so the unit can do cooling and heating simultaneously. This terminal device is only available in the Chilled Beam and Induction category.
 
Library Type:  Equipment:  Cooling Coil:  Water (Simple)
Equipment:  Cooling Coil:  Water (Detailed)
Equipment:  Heating Coil:  Water
 
Placement Rules:  Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
Chilled Beam (Active) and Chilled Beam (Passive)
The Chilled Beam terminal device is used to do sensible cooling on centrally conditioned and dehumidified supply air. This terminal device includes a cooling coil. The chilled beam can be set to active or passive in the terminal device properties. This terminal device is only available in the Chilled Beam and Induction category.
 
Library Type: N/A
 
Placement Rules: Terminal devices are placed in the supply air path directly before the demand box.
Link to properties
 
 
 
 
 
Zone Equipment
 
Clicking the Zone Equipment button will expand the list of components available for the system type that is being created. Only available zone equipment will be populated in the zone equipment list.
Zone equipment is assigned directly to the zone. Zone equipment may include coils and fans. The configuration of coils and fans in zone equipment cannot be changed in the Systems library. These will need to be edited in the specific equipment libraries. Properties for the chosen library can be viewed by clicking the properties button at the bottom of the screen. 
 
 
Fan Coil Unit
The four pipe fan coil contains a cooling coil, heating coil, and fan.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Fan Coil Unit
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
PTAC
The packaged terminal air conditioner contains a cooling coil, heating coil, and fan.  See equipment library for more details
 
Library Type:  Equipment:  Zone Forced Air:  Packaged Terminal Air Conditioner
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Packaged Terminal HP
The packaged terminal heat pump contains a DX cooling coil, DX heating coil, fan, and supplemental heating coil configured as an air to air heat pump.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Packaged Terminal HP
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
 
WSHP
The water to air heat pump contains a water to air cooling and heating coil, fan, and supplemental heating coil configured as a water to air heat pump.  See equipment library for more details 
 
Library Type:  Equipment:  Zone Forced Air:  Water Source Heat Pump
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Unit Heater
The unit heater contains a heating coil and a fan.  See equipment library for more details 
 
Library Type:  Equipment:  Zone Forced Air:  Unit Heater
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Four Pipe Unit Ventilator
The unit ventilator contains a cooling coil, heating coil, fan, and outdoor air mixer. The unit ventilator can use an economizer.  See equipment library for more details 
 
Library Type:  Equipment:  Zone Forced Air:  Four Pipe Unit Ventilator
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
 
Unit Ventilator (Heating Only)
The heating only unit ventilator contains a heating coil, fan, and outdoor air mixer.  The unit ventilator can use an economizer.  See equipment library for more details 
 
Library Type:  Equipment:  Zone Forced Air:  Unit Ventilator (Heating Only)
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Unit Ventilator (Cooling Only)
The cooling only unit ventilator contains a cooling coil, fan, and outdoor air mixer.  The unit ventilator can use an economizer.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Unit Ventilator (Cooling Only)
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Energy Recovery Ventilator
The energy recovery ventilator is used to recover energy between the supply or outside air and the exhaust air.  It consists of an air to air heat exchanger, supply fan, and exhaust fan.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Energy Recovery Ventilator
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Radiant Heat
The radiant heat zone equipment models radiant and convective heat transfer from a baseboard heater.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Radiant and Convective:  Water Radiant Heat
Equipment:  Zone Radiant and Convective:  Steam Radiant Heat
Equipment:  Zone Radiant and Convective:  Electric Radiant Heat
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Wall Convector
The wall convector equipment is used to condition any remain heating loads not met by the central conditioning system.  See equipment library for more details 
 
Library Type:  Equipment:  Zone Radiant and Convective:  Hot Water Baseboard Wall Convector
Equipment:  Zone Radiant and Convective:  Electric Baseboard Wall Convector
Equipment:  Zone Radiant and Convective:  Skin Baseboard Heating Wall Convector
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Radiant Ceiling
The radiant ceiling provides radiant cooling or heating at the ceiling level in the space.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Variable Flow (Heating)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Variable Flow (Cooling)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Variable Flow
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Constant Flow (Heating)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Constant Flow (Cooling)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Constant Flow
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Electric
Equipment:  Zone Radiant and Convective:  High Temperature Radiant
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
 
Radiant Floor
The radiant floor provides radiant cooling or heating at the floor level in the space.  See equipment library for more details 
 
Library Type:  Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Variable Flow (Heating)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Variable Flow (Cooling)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Variable Flow
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Constant Flow (Heating)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Constant Flow (Cooling)
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Constant Flow
Equipment:  Zone Radiant and Convective:  Low Temperature Radiant Electric
Equipment:  Zone Radiant and Convective:  High Temperature Radiant
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Dehumidifier DX
The DX dehumidifier contains a DX cooling coil and a fan used to condense moisture out of the air.  The compressor heat from the cooling coil is used to reheat the cooled, dehumidified air.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Dehumidifier
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Variable Refrigerant Flow
The variable refrigerant flow equipment models a DX indoor unit that is connected to an outdoor condensing unit.  The unit can operate in cooling, heating, or simultaneous cooling and heating.  This equipment is only available in the Variable Refrigerant Flow System pattern in the Variable Air Volume system category.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Variable Refrigerant Flow (Heat Pump)
Equipment:  Zone Forced Air:  Variable Refrigerant Flow (Cooling)
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
Window Air Conditioner
The window air conditioner contains a DX cooling coil, fan, and outdoor air mixer.  See equipment library for more details. 
 
Library Type:  Equipment:  Zone Forced Air:  Window Air Conditioner
 
Placement Rules:  Zone equipment is placed directly in the demand box so each zone will have a separate piece of zone equipment. 
 
 
 
 
 
Air Loop Controls/Sensors
Air loop controls and sensors must be applied to the system in order to define the location of temperature and humidity sensors and how the system is controlled.  The sensor must be placed in the air path and connected to a component or components that will control the temperature or humidity.
 
For example, in order to control the temperature at the outlet of a draw through fan, the temperature sensor should be placed in the air path after the fan and the controller should be connected to both the cooling coil and the heating coil. 
 
 
Temperature Sensor
A temperature controller is required.  The temperature sensor is placed on the diagram to measure the temperature at that point in the air path.  This controller should be connected to the OA control as well as each of the coils. Some system configurations will require multiple temperature controllers.  For example, the dual duct system will require a separate temperature for the cooling coil on the cold deck and heating coil on the hot deck.  Different control strategies can be used to maintain the temperature at the desired values.  See the Properties for more details.
 
 
Humidity Sensor
A humidity controller is optional.  The humidity sensor is placed on the diagram to measure the humidity at that point in the air path.  Different control strategies can be used to maintain the humidity at the desired values. See the Properties for more details.
 
 
 
 
 
 
Diagram
The diagram is the main working pane of the systems library. The diagram contains the air path and images of all of the components, terminal device, zone equipment, and controls that are used in the system. 
 
When creating a system it is good to remember that the system will be applied to all the zones, so making a system that is the lowest common denominator will allow for further customization in the Zone equipment section in the project.  This will allow different terminal devices or zone equipment to be used in specific zones instead of all of the zones on the system.
 
 
 
 
Air Path
The air path indicates the flow of air from component to component.  The air path shows the direction of the air and how the air path combines and separates.  Whenever a component is added to the airpath, a button will indicate where on the air path that component can be placed.
 
Zone
The zone represents the space that will be conditioned by the system.  Zone level equipment will be placed in the zone on the diagram.
 
Controller connection lines
The controllers need to be connected to the components that they will control.  These connections will be displayed as connection lines on the diagram.  The temperature controller needs to be connected to both the outdoor air controller and the coils in the air path.  If there is a humidity controller it should be connected to the components as well.  Components that can be controlled by multiple controllers will have multiple ports where the controller can be connected.
 
Louvers and Dampers
Louvers and dampers represent points where the flow can be decreased or shut off completely.  These come with the system diagram and may not be moved or removed.
 
 
 
Validation button
The validation button is used to verify the system has been configured correctly.  If there are any problems with the system library, the library can be saved but it will not be available to select in the project.
Clicking the validation button will bring up a flyout pane that lists any problems with the system.  If the problem relates to a specific component, click on the magnifying glass to highlight the component in the diagram. 
 
 
Library dropdown
The Library dropdown allows the user to navigate to a different library such as the equipment library or materials library. 
 
 
Systems category dropdown
The systems category dropdown allows the user to navigate to a different system category for example to the 90.1 Systems category or the Variable Air Volume (VAV) category.
 
 
System Library Specific dropdown
The system library specific dropdown allows the user to navigate to a different system library within the current system category. 
 
 
Search Library
The search window allows the user to search for a specific library member by name.