HVACTutorials

© 2007 Design Master Software, Inc

Design Master HVACTutorial

Design Master HVAC Tutorial2


Table of Contents

0

Part I Introductory Tutorials 3

................................................................................................................................... 31 Starting a New Project

................................................................................................................................... 82 Load Calculations

.......................................................................................................................................................... 8Creating and Defining Rooms

.......................................................................................................................................................... 11Defining Walls

.......................................................................................................................................................... 17Setting Project and Zone Information

.......................................................................................................................................................... 21Viewing and Printing Load Calculations

.......................................................................................................................................................... 26Creating Load Calculation Maps

................................................................................................................................... 333 Diffusers

.......................................................................................................................................................... 34Creating Diffusers

.......................................................................................................................................................... 38Inserting Diffusers

.......................................................................................................................................................... 43Editing Diffusers

.......................................................................................................................................................... 46Checking Supplied CFM

.......................................................................................................................................................... 47Setting CFM

.......................................................................................................................................................... 49Inserting a Diffuser Schedule

.......................................................................................................................................................... 50Editing and Re-inserting a Diffuser Schedule

................................................................................................................................... 524 Ducts

.......................................................................................................................................................... 52Inserting Supply Ducts

.......................................................................................................................................................... 57Inserting Return Ducts

.......................................................................................................................................................... 60Inserting Duct to Diffuser Connections

................................................................................................................................... 635 Duct Sizing and Double Line Drafting

.......................................................................................................................................................... 63Ductwork Calculations

.......................................................................................................................................................... 67Editing and Recalculating Ducts

................................................................................................................................... 696 Sections and 3D

.......................................................................................................................................................... 69Creating Sections

.......................................................................................................................................................... 73Inserting Sections

.......................................................................................................................................................... 74Viewing Drawing in 3D

................................................................................................................................... 767 Project Drawing and Database Management

Index 0

Introductory Tutorials 3


1 Introductory Tutorials

The HVAC tutorials are a training tool designed to allow you to work through them atyour own pace. This file includes the step-by-step instructions. The AutoCADdrawings and Design Master HVAC databases can be downloaded from http://www.designmaster.biz/support/downloads/hvacTutorial.exe.

When you run the hvacTutorial.exe file, it will install all of the files necessary to workthrough these tutorials. Two copies of this tutorial will be installed: a help file suitablefor viewing on your computer, and a PDF that you can use to print the tutorial.

The drawing files for the tutorial are installed to the "My Documents\DM HVACTutorials" folder on your computer. In this folder, there are a number of differentfolders that correspond to the different steps in the tutorial. Each folder contains theAutoCAD drawings, Design Master HVAC database, and other files necessary foreach step.

The tutorials are sequential, with each one building upon the last. You can use thefiles in the step after the one you are working on to check your work. For example, tocheck your work on step 1, you can compare what you have done with the files instep 2. If you are able to proceed from step to step without needing to recreate adrawing, you may continue to work on the same drawing. Alternatively, you maychoose to start with the drawing included in each folder for each new step.

To begin the tutorials, see the Start New Project section.

1.1 Starting a New Project

This tutorial will teach you how to properly start a new Design Master HVAC Project.

Before starting a new project in Design Master HVAC, it is necessary to setup yourdrawings. This process varies between companies. Typically it involves setting upthe title block, inserting xrefs, and setting scale factors. It is beyond the scope of thistutorial to teach you how that is done in your company. If you have questions aboutthis, please see your CAD Manager or the person responsible for setting up projects.However, there are two tasks that are part of the typical project setup that will not bepart of this tutorial that we want to highlight:

1. It is necessary for the drawing you are working in to be saved in a project folder.Each project needs to be in a separate folder because all of the drawings in acommon folder are assumed to be in a single project and therefore share a singleDesign Master HVAC database. For the introductory tutorials, the files for eachtutorial are in a different folder. The result is that each tutorial is seen as a separateproject.



2. The AutoCAD system variable DIMSCALE needs to be set correctly. Text andblocks are sized accordingly to this variable. In this tutorial, the DIMSCALE is setcorrectly for you. You can read more on our website about how to set DIMSCALE(http://www.designmaster.biz/Support/QandA/HowtoSetDIMSCALE.html).

To start this tutorial, start AutoCAD and open the M1.dwg file in the Start NewMechanical Project tutorial folder. Your drawing should look like this:

For the first step in starting a new HVAC project, go to

DM HVAC Start New HVAC Project

The Start New HVAC Project dialog box will appear as shown below.



Press the Select City button. The Select City dialog box will appear as shownbelow.

For the purposes of this tutorial, please select the City Group "WA" and the City "Seattle, Int'l Airport". Press OK. You will be returned to the Start New HVAC Project



dialog box, which will now match the one shown below. (Note the section highlightedin blue will have changed).

Type "Tutorial" in the Project Name field and press OK. Design Master HVAC willinitialize the project; this will take a few seconds.

Next, you will insert the alignment point. The alignment point is used by DesignMaster HVAC as the origin for its coordinate system. It should be set in the samelocation relative to the building in each drawing.

You can read more about the alignment point in the online documentation.

To insert the alignment point, go to

DM HVAC Insert Alignment Point

Design Master HVAC will ask you to specify an insertion point. Click so the insertionpoint is at the lower left hand corner of the building just outside the lobby, as shownbelow.



Design Master HVAC will ask you to specify the rotation angle. The alignment pointarrow should always point in the direction of north on the drawing. For this drawing,rotate the arrow until it is pointing up towards the top of the drawing as shown below,then click. For future projects, this direction will not always be up on the drawing. Thedirection will not always be the same on every drawing in a project.



Congratulations! You now know how to start a new HVAC project using DesignMaster HVAC.

See Load Calculations for the next tutorial.

1.2 Load Calculations

This tutorial will teach you how to create and define rooms, define walls, create andprint load calculations, and create load calculation maps. The commands for loadcalculations fall under the Building Definition and Load Calculations sections on themain Design Master HVAC menu.

To begin this tutorial, go to the Creating and Defining Rooms section.

1.2.1 Creating and Defining Rooms

To create a room, go to

DM HVAC Building Definition Rooms Create Room

The Create New Room dialog box will appear as shown below.



Begin by creating room 101, the lobby. Type "101" in the Room Number area, andchoose "Office-Main Entry Lobbies" in the Room Type area. Your dialog box shouldmatch the one shown below. The areas you needed to change are highlighted inyellow in the screen shot below; they will not be highlighted in your dialog box.

Once the specifications match, press Create Room. Design Master HVAC will takeyou to the drawing and ask you to specify the first room point. Specify the insidecorners of the lobby; include the hallway. Once you have selected every corneronce, press ENTER and Design Master HVAC will close the room automatically.Once the room has been closed, Design Master HVAC will prompt you to specify thelocation of the room information. Locate the room information box outside of thebuilding. Your drawing should match the one shown below.



Repeat these steps for the other rooms in the building. Rooms 103, 105, 107, and104 should be set to Room Type "Office-Telephone/Data Entry", Conference 102 shouldbe set to Room Type "General-Conference", and Storage 106 should be set to RoomType "General-Storage". When you have finished, your drawing should match the oneshown below.



The rooms in the building are now defined. The next step in specifying the inputs forthe building load calculations is to define the walls.

1.2.2 Defining Walls

To define the walls, you will first need to insert break points into the walls of roomsthat are both exterior and interior walls, for instance the north wall of the lobby. Toinsert a break point in a wall, go to

DM HVAC Building Definition Walls Insert Wall Point

Design Master HVAC will prompt you to select the wall at the break point. Click onthe north lobby wall where the outside wall of the conference room meets it. DesignMaster HVAC will insert a wall point at that location.



To check that Design Master HVAC has inserted a wall point in the correct location,you may click on the wall to see the grip points. They should appear as shownbelow.

Wall points need to be inserted everywhere an outside wall becomes an inside wall.These locations are on the west wall of the lobby where the wall meets office 103and on the north wall of office 105 where the wall meets office 107. These locations,in addition to the one just completed, are shown in the drawing below.



Once you have inserted the wall points, you are ready to define the exterior walls. Todo this, go to

DM HVAC Building Definition Walls Query Wall

Design Master HVAC will prompt you to select a wall to query. Select an exteriorwall, such as the east wall of Conference 102. The Specific Wall Information dialogbox will appear as shown below. Set the specifications of the wall to match thoseshown below. The fields you will need to change are highlighted below in yellow.Note that when the dialog first opens, No Heat Transfer is chosen in the top left-handcorner and the other options are not available for editing. Thus, you must first select Heat Transfer and Solar Gain (Wall) before being allowed to set the remaining fields. Oncethe specifications match those shown below, press OK.



Design Master HVAC will increase the width of the wall you queried. This thicknessindicates that there is a heat transfer though the wall.



To copy the wall properties from this wall to the other exterior walls, go to

DM HVAC Building Definition Walls Match Wall Properties

Design Master HVAC will prompt you to select a wall to use as the source. Select theeast wall of the conference room (the thick wall as shown in drawing above). DesignMaster HVAC will next prompt you to select a wall to which to copy. This means toselect the wall you wish to copy the wall properties to. Click on an exterior portion ofthe north wall of the lobby. The wall you select should increase in width to indicatethat it has been changed from an interior partition with no heat transfer to an exteriorwall with a heat transfer. Continue to select exterior portions of walls until the entireexterior of the building is defined. When you have finished, press ENTER to exit thecommand. Your drawing should match the one shown below.



Next, you will edit the exterior wall of the conference room to include more glass. Toedit a wall's properties, go to

DM HVAC Building Definition Walls Query Wall

Design Master HVAC will prompt you to select a wall to query. Select the exteriorwall of Conference 102. The Specific Wall Information dialog box will appear asshown below. Set the specifications of the wall to match those shown below. Thefields you will need to change are highlighted below in yellow. Once thespecifications match those shown below, press OK.



You now have the rooms and walls defined. In order to complete specifying theinputs for the building load calculations, you must next set the project and zoneinformation.

1.2.3 Setting Project and Zone Information

To set the project information, go to

DM HVAC Building Definition Project Info

The Project Information dialog box will open. At the top, type "Tutorial" in the ProjectName field.

Note that the city was selected when the project was created (see Starting a NewProject for a review). The city may be changed at any time during the project usingthe Select City button in the Project Information dialog box.



Also while you are in the Project Information dialog box, select the check boxesnext to June and August as shown below. The months that are checked in this dialogbox are the ones that will be used when the loads are calculated. Selecting moremonths allows you to include non-summer peaks in your loads. For example, it iscommon in southern latitudes to have room loads with lots of south facing glass thatpeak in the winter months. However, selecting more months increases the amount oftime it takes to calculate the load. You will need to use your judgment to determinewhen to calculate loads for more than the typical summer months.

When your Project Information dialog box matches the one shown below, press OK.



To set the zone information, go to

DM HVAC Building Definition Zones Zone List

The Zones dialog will open as shown below.

Next, you will create two more zones. Press the New button. The New dialog willopen as shown below.

In the New dialog box, type "Z1" as the New Zone Name and press OK. You have



now created a new zone in the database. Repeat this process to create anotherzone, called Z2, in the database. At this point, there are three zones in the database;the default or main zone, Z1, and Z2.

It is now important to set which rooms are in which zone and how the zones arerelated to each other. This is done using the Zone Tree. To do this, go to

DM HVAC Building Definition Zones Zone Tree

The Zones and Rooms dialog box will open as shown below.

Note that when Zones Z1 and Z2 were created, they were automatically placedunder Zone Default, which is where we want them. However, we also want theoffices and storage room (Rooms 103 thru 107) under Zone Z1 and the conferenceand lobby (Rooms 101 and 102) under Zone Z2, which they currently are not. To putthem in the correct location, click and drag the room the way you would rearrangefolders in a Windows Explorer window. When your zone tree matches the one shownbelow, press OK.



The next step is to view and print the load calculations.

1.2.4 Viewing and Printing Load Calculations

To have Design Master HVAC calculate and display the load calculations for a singleroom, go to

DM HVAC Load Calculations View Room Load

Design Master HVAC will prompt you to select a point inside a room. Click insideConference 102. The Load Detail dialog box will appear as shown below. Thisdialog box shows you the peak load values for this room.

You may check the load values at other times clicking on the hour input in the Timerow and selecting a different time, or by clicking on the month input in the Time rowand selecting a different month. After selecting a different time or month, pressENTER to update the values.



The Load Detail dialog box contains a Print button, which allows you to print theload calculation information for the selected room only. For this tutorial, we wish toprint the load calculations for the entire building, not for only this drawing. Press OKto close the Load Detail dialog box.

To view the load calculations for a zone, go to

DM HVAC Building Definition Zones Zone Tree

The Zones and Rooms dialog box will open as shown below.



Highlight Zone Z2 on the left and press View Load. A Design Master HVAC dialog boxwill open as shown below.

Press Yes. Design Master HVAC will calculate the loads for Zone Z2. When thecalculations are complete, a Load Detail dialog box will open as shown below. Thisdialog box now shows you the peak load values for this zone rather than for a singleroom as was demonstrated above. The same principles apply. Press OK to closethe Load Detail dialog box.



To print the load calculations for the entire building, go to

DM HVAC Load Calculations Print Preview Load Calculations

The Print Load Calculations dialog box will appear as shown below.



Make certain "Tutorial (SEATTLE, INT'L AIRPORT, WA)" is selected under Zone or Room toPrint as shown above. This indicates that you wish to print the load calculations forthe entire building. Because only the load calculations for Room 102 and then forZone Z2 have already been calculated, you must first press Calculate and PrintLoads. Design Master HVAC will perform the load calculations for the entire buildingand will show the results in your default browser (Internet Explorer, Netscape,Firefox, etc.).

To print the load calculations, you may press Print in your browser, however for thistutorial we will print the load calculations using another Design Master HVACcommand to demonstrate the difference between Print Load Calculations and PrintPreview Load Calculations. Return to the AutoCAD drawing and go to DM HVAC Load Calculations Print Load Calculations

The Print Load Calculations dialog box will again appear. Make certain "Tutorial(SEATTLE, INT'L AIRPORT, WA)" is selected under Zone or Room to Print. Press Print

Loads. The Print dialog box will appear as shown below.



Select your desired printer and press Print. It will take a few moments for the loadsto print, so you may wish to stand up and stretch or perform your favorite in-officeexercises, then walk over to the selected printer and pick up the load calculationoutput. For this tutorial, you may choose the environmentally-friendly option andpress Cancel instead of Print to save paper and trees.

In addition to viewing and printing the load calculations, you also have the option tovisualize them by creating load calculation maps.

1.2.5 Creating Load Calculation Maps

Load Calculation Maps allow you to improve the quality control process whenchecking your load calculations. This is accomplished by allowing you to visualizethe distribution of the loads on the drawing in addition to viewing the numbers in atable such as was done when the load calculations were printed in the previous stepof this tutorial.

To create a load calculation map, go to

DM HVAC Load Calculations Display Load Calculation Map



The Load Calculation Map dialog box will appear as shown below.

Select Cooling System Load in the left-hand box and People in the right-hand box asshown below. The settings you will need to change are highlighted in yellow in thescreen shot below.



Press OK. Design Master HVAC will take you to the drawing and prompt you tospecify the scale location. Click outside of the building to indicate the temporaryplacement of the scale key to aid in interpreting the map. Design Master HVAC willcolor fill each room in the building, as shown below.



Note that rooms with a higher BTUH per square foot, or a higher average peoplecooling load, are a lighter shade of blue, while rooms with a lower BTUH per squarefoot are a darker shade of blue. In particular, this map shows that the conferenceroom, in white, has the highest people cooling load, while the storage room, in black,has the lowest people cooling load. This map allows a quality-control check to beperformed at a glance.

To create another load calculation map, go again to


The Load Calculation Map dialog box will appear. Set the specifications to matchthose shown below, then press OK. The settings you will need to change arehighlighted in yellow in the screen shot below.



Design Master HVAC will update the load calculation map to reflect the most recentselections. The scale will be placed in the same location. Your drawing should matchthe one shown below.



Note that this load calculation map works on the same principles as the perviousone. Rooms with the highest heating load are light red and rooms with the lowestheading load are dark red. Thus, the conference room, in white, has the highest totalheating load and the storage room, in black, has the lowest. To demonstrate thedifference between the total heating load per room versus the average heating loadper room, go to


Set the Load Calculation Map dialog box to match the specifications highlightedbelow and press OK.



Your drawing should now match the one shown below.

In the previous load map, the heating load in the conference room was white,indicating that it required the most total heating. The heating load in all of the officeswere dark red, indicating a low total heating load.

In the new map below, the heating load in the conference room and offices are allshades of pink, indicating that the average heating load in the rooms is similar.When looking at the offices, you can see that Office 103 has the highest averageheating load. That makes sense because it has a south facing exterior wall, asopposed to Office 105, which has only a west facing exterior wall.

If the average heating load for one of the offices were significantly different from theothers, you would know that you should investigate that office to determine if it isproperly defined. Thus, the load calculation map feature of Design Master HVACmakes it possible to graphically check for load calculation errors, rather than being



required to scan the long lists of numbers in the printed output (although you can dothat, too, for extra quality certainty, since Design Master HVAC also allows the loadcalculations to be printed, as was done in the Viewing and Printing Load Calculationsstep.)

To clear the Load Calculation Map in order to move on with the design process, goto

DM HVAC Load Calculations Erase Load Calculation Map

Design Master HVAC will erase the Load Calculation Map colors and the scale.

Congratulations! You now know how to perform the basic load calculation functionsusing Design Master HVAC.

See Diffusers for the next tutorial.

1.3 Diffusers

This tutorial will teach you how to create diffusers in the database schedule, how toinsert diffusers onto the drawing, how to edit diffusers once they are inserted onto



the drawing, how to quickly view the percent of required CFM supplied, how to setthe total CFM in a room or in multiple diffusers, and how to insert a diffuser scheduleonto the drawing.

To begin this tutorial, go to the Creating Diffusers section.

1.3.1 Creating Diffusers

To create diffusers, go to

DM HVAC Diffusers Diffuser Project Schedule

The Diffuser Project Schedule dialog box will appear as shown below.

Press the New button. The New dialog box will appear as shown below.

In the New dialog box, type "S-1" as the New Diffuser Callout and press OK (The



dash is important when Design Master HVAC determines whether a diffuser isappropriate for the needed CFM). The diffuser is now created in the database, andthe next step is to define the diffuser. In order to facilitate this next step, DesignMaster HVAC will automatically take you to the Diffuser Project Schedule dialogbox for the diffuser S-1, and you may now enter the diffuser specifications.

Set the diffuser specifications for S-1 to match those shown below. (Thespecifications that you will need to change are highlighted in yellow in the screenshot below. They will not be highlighted on your dialog box. The blue highlightedarea is set by the previous step, typing S-1 into the New dialog box.) Once thespecifications match, press Save.

Note that the Block Number: and Block Type: and the block itself have changed.Changing the block will automatically change the description and block name. Tochange the block, press Select Block, choose the appropriate block from the SelectDiffuser Block dialog box, and press OK.

Next, use the above process to create diffusers S-2, S-3, and S-4 with thespecifications shown in the dialog boxes below. Press New, type the appropriatecallout as highlighted in the screen shots below in blue for the New Diffuser Callout,and press OK. Set the specifications to match those shown below and press Save.





Finally, you will define two return diffusers using the same process. Press New, type"R-1" for the New Diffuser Callout, and press OK. Set the specifications to matchthose shown below and press Save.



Press New, type "R-2" for the New Diffuser Callout, and press OK. Set thespecifications to match those shown below and press Save.

Now you have defined diffusers in the project schedule, and are ready to insert themon the drawing.

1.3.2 Inserting Diffusers

To insert diffusers on the drawing, go to

DM HVAC Diffusers Insert Diffusers

The Diffuser Information dialog box will appear. You will be inserting some S-1diffusers; set the specifications to match those shown below. Press OK.



Design Master HVAC will take you to the drawing and will prompt you to specify theinsertion point. Locate the diffuser in Conference 102 as shown below and specifythe rotation angle of the diffuser. When you have indicated both an insertion pointand rotation angle, Design Master HVAC will again prompt you for an insertion point,allowing you to insert another S-1 diffuser with the same specifications. Insert asecond diffuser as shown below, indicating insertion point and rotation angle. Whenyou have finished, press ENTER to complete the command.



Next, use the AutoCAD Copy command to copy the two diffusers already inserted inConference 102 and place the two new copies at the other end of the room, asshown below.

Next, you will place supply diffusers in Offices 103, 105, and 107. To do this, go to

DM HVAC Diffusers Insert Diffusers



The Diffuser Information dialog box will appear. Set the specifications to matchthose shown below, then press OK.

Note that we purposely had you input a CFM that is not compatible with the definitionof diffuser S-1. After pressing OK, Design Master HVAC will display the Warningdialog box shown below.

Press Change, which will return you to the Diffuser Information box. Select diffuserS-2 and press OK. Insert one diffuser each in Offices 103, 105, and 107 as shownbelow.



Next, use the process already described to insert return diffusers R-1 as shownbelow. In the Diffuser Information dialog box, select Callout R-1 and set the CFM to400.



For this tutorial, we now wish to edit the return diffusers in the three offices andchange their CFM.

1.3.3 Editing Diffusers

To edit multiple diffusers, go to

DM HVAC Diffusers Edit Multiple Diffusers

A Diffuser Information dialog box will appear as shown below. Note that this dialogis slightly different from the Diffuser Information dialogs previously seen.



In this dialog, checking the box next to a field will allow you to set that field forwhichever diffusers you wish to define. For this tutorial, check the box next to CFMand type in 350, as shown and highlighted in yellow below. Then press OK.



Design Master HVAC will take you to the drawing and prompt you to select objects.Select each of the return diffusers in the three offices. When you have selectedthese three diffusers, press ENTER to indicate you have finished selecting objects.Design Master HVAC will modify the diffusers. Your drawing should now match theone shown below.



Now that we have the supply and return air CFM set where we want it, our next stepis to check whether this design is sufficient to meet the load requirements of therooms.

1.3.4 Checking Supplied CFM

To quickly visualize whether the correct amount of CFM is supplied to each room,use the Room Attributes Load Calculation Map. To insert this map, go to


Select Room Attributes in the left-hand side of the Load Calculation Map dialog andPercentage of Required CFM Supplied in the right-hand side. When prompted, place thescale on the drawing. Your drawing should match the one shown below.



Note that rooms with 100% of the required supply air are colored in white and thatrooms needing more supply air are colored in shades of blue. This lets us quicklysee that the rooms in the building need more supply air. Next, we will use the SetCFM commands to set the diffusers to supply more air

1.3.5 Setting CFM

Design Master HVAC can automate much of the process of determining the requiredCFM for a room and setting the supplied CFM to equal the required CFM.Determining the required CFM is done when the load calculations are completed. Toset the supplied CFM in a room to equal the required CFM, go to

DM HVAC Set CFM Total In a Room

Design Master HVAC will prompt you to select a point inside the room. Click insideOffice 107. The Set CFM Total in a Room dialog box will appear as shown below.



This dialog box indicates the required CFM as calculated by Design Master HVACbased on the room definition. In this case, the required CFM is 422, while thesupplied is 350. To enter a new supplied CFM, type the desired number in the NewCFM field. If the default new CFM is left as shown, Design Master HVAC will roundthis number to the nearest five. For this tutorial, leave the number for New CFM andNew Return CFM set to 422 and press OK. Office 107 should now appear as shownbelow. Note that Design Master HVAC set the supplied CFM to 425 and alsoautomatically adjusted the diffuser R-1 to the diffuser R-2, as R-2 is needed to return425 CFM of air.

Repeat this process for Offices 105 and 103 as well as for Conference 102. Then,update the Room Attribute Load Calculation Map by running the Display LoadCalculation Map command (See Creating Load Calculation Maps for a review of this



command). Your drawing should now match the one shown below.

To erase the map, run the Erase Load Calculation Map command. Now that youhave inserted the appropriate number and size of diffusers on the drawing for yourdesign, you will insert the diffuser schedule.

1.3.6 Inserting a Diffuser Schedule

The diffuser schedule will be placed on drawing M0, rather than M1 where you havebeen working to this point. Open M0.dwg from the folder you are currently workingin. Then, to insert the diffuser schedule, go to

DM HVAC Diffusers Insert Diffuser Schedule

The Diffuser Project Schedule dialog box will open as shown below.



Press OK to insert the diffuser schedule using the default column labels and order.Design Master HVAC will take you to the drawing and ask you to specify an insertionpoint. Click to indicate the placement of the top left-hand corner of the schedule.Your drawing should match the one shown below.

The columns that are displayed in the diffuser schedule and their labels can becustomized to match your company's standards. In addition, the diffuser schedulemay need to be updated as the design changes. Therefore, next we will demonstratehow to edit and re-insert the diffuser schedule.

1.3.7 Editing and Re-inserting a Diffuser Schedule

To edit the appearance of a diffuser schedule either before or after it has beenplaced on the drawing, go to

DM HVAC Diffusers Insert Diffuser Schedule

The Diffuser Project Schedule dialog box will open as shown below.



Press Edit Column Labels and Order. The Diffuser Schedule Label Display andOrder dialog will appear. Uncheck the box in the Display column for the Description,Model, and Notes rows as shown below. These empty columns previously displayedin the diffuser schedule will not be included.

When you have finished editing the label display and order columns and rows, press OK. You will be returned to the Diffuser Project Schedule dialog box. Press OK.Design Master HVAC will take you to the drawing and ask you to specify an insertionpoint for the diffuser schedule. Press ENTER to place the new diffuser schedule inthe exact same location as the previous location. Design Master HVAC willautomatically erase the old diffuser schedule and replace it with the new one. Yourdrawing should now match the one shown below.



Congratulations! You now know how to perform the basic diffuser functions usingDesign Master HVAC.

See Ducts for the next tutorial.

1.4 Ducts

This tutorial will teach you how to insert supply and return ducts and how to connectducts to diffusers.

To begin this tutorial, go to the Inserting Supply Ducts section.

1.4.1 Inserting Supply Ducts

Ducts will be inserted on the M1 drawing, where the diffusers were inserted. Toinsert a duct onto the drawing, go to

DM HVAC Duct Centerlines Insert Duct

Design Master HVAC will ask you to specify the first point. Select a point on the left-hand side of the lower hallway near the lobby. You will then select a second point atthe opposite end of the hallway. The approximate location of these two points areindicated on the drawing below.



Once you have indicated the two points, the Duct Information dialog will appear asshown below.



Type in "9" for the Starting Elevation and Ending Elevation as shown below, thenpress OK.

Design Master HVAC will return you to the drawing. Press ENTER to indicate thatyou have finished drawing the length of the duct. Your drawing should match the oneshown below.



Next, insert a piece of duct off of the inserted duct going into the conference room.To do this, go to


When Design Master HVAC asks for the first point, make certain that it connects tothe previously inserted duct by using a NEAR osnap. If the Duct Information dialogappears, you did not connect the point of the new duct to the inserted duct. Press Cancel and try again. Make certain the second point of the duct is placed such that itgoes past the supply diffusers. After indicating the second point, press ENTER toindicate that you have finished drawing the length of the duct. Your drawing shouldmatch the one shown below.



Repeat the Insert Duct command, connecting and inserting a supply duct into Offices103, 105, and 107. Place the end of the ducts near the supply diffusers. When youhave finished, your drawing should match the one shown below.



Next you will insert return ducts.

1.4.2 Inserting Return Ducts

Inserting return ducts uses the same basic command and process as used above toinsert supply ducts. To insert a return duct, go to


Insert the return duct running parallel to the supply duct in the hallway. Specify thefirst and second points of the return duct as shown below. Note that these are similarfirst and second points to those used for the supply duct. The return duct shouldpoint in the same direction as the supply duct, as in Design Master HVAC all ductsshould always point from the air handler to the diffusers, not necessarily in thedirection of airflow.



Set the Duct Information dialog box specifications to match those shown below.(The specifications you will need to change are highlighted in yellow in the screenshot below. They will not be highlighted in your dialog box.)

Your drawing should now match the one shown below.



The last duct to insert is a return duct going into Conference 102. Use the InsertDucts command, and set the end point of the duct just far enough into theconference room to reach the return diffusers. Your drawing should match the oneshown below.



Now that both ducts and diffusers are inserted, you can insert duct to diffuserconnections.

1.4.3 Inserting Duct to Diffuser Connections

Next, you will connect the diffusers to the ductwork. First you will connect the supplydiffusers in Offices 103, 105, and 107 to the supply ducts using end connections. Todo this, go to

DM HVAC Diffuser Connections End Connection

Design Master HVAC will prompt you to select the diffuser to connect. Select diffuserS-2 in Office 103. You will then be prompted to select the duct. Select the supplyduct entering Office 103. Design Master HVAC will connect the diffuser and the duct.Your drawing should match the one shown below.



Repeat this command for the supply ducts in Offices 105 and 107. Your drawingshould match the one shown below.

To connect the supply diffusers in Conference 102 to the supply ducts and toconnect the return diffusers in the entire building to the return ducts, you will use a



perpendicular connection. To do this, go to

DM HVAC Diffuser Connections Perpendicular Connection

Design Master HVAC will prompt you to select the objects you wish to connect. Clickon the S-2 diffusers in Conference 102. When you have finished selecting thediffusers, press ENTER. You will then be prompted to select the duct. Select thesupply duct entering Conference 102. Design Master HVAC will connect the diffusersand the duct. Your drawing should match the one shown below.

Repeat these steps for the return diffusers in Conference 102, selecting the returnduct to connect to. Also complete these steps for the return diffusers in Offices 103,105, and 107, connecting these diffusers to the return duct in the hallway. Yourfinished drawing should match the one shown below.



Congratulations! You now know how to perform the basic duct, diffuser, and diffuserconnection functions using Design Master HVAC.

See Duct Sizing and Double-line for the next tutorial.

1.5 Duct Sizing and Double Line Drafting

This tutorial will teach you how to perform calculations on your ductwork, includingcalculating the CFM in the ducts, sizing the ducts, and calculating the pressure in theducts. This tutorial will also teach you how to draw the double-line ductwork and howto edit the ductwork and repeat the calculations.

To begin this tutorial, go to the Ductwork Calculations section.

1.5.1 Ductwork Calculations

To have Design Master HVAC perform ductwork calculations, go to

DM HVAC Ductwork Calculations

The Duct Calculations dialog box will appear as shown below.



Make certain the Ducts in a System option is selected, then press Calculate CFM,Size Ducts, and Calculate Pressure. Design Master HVAC will prompt you to select aduct in the system you wish to calculate. Select a blue supply duct. Design MasterHVAC will take a few moments to calculate the CFM and pressure, size the ducts,and draw the double line all in one step. Your drawing should now match the oneshown below.

Repeat the command, this time selecting an orange return duct. Your drawing



should match the one shown below.

In order to turn off the non-plotting centerline layer to view what the drawing will looklike when plotted, go to

DM HVAC Layer Management Turn Duct Centerlines Off

Design Master HVAC will remove the centerlines. If you zoom in on Conference 102and Office 105, your drawing should match the one shown below. Note that thehidden lines are not properly drawn.



To have Design Master HVAC use the elevations of the ducts to draw hidden lines,type HIDE at the command line. Your drawing should now match the one shownbelow.

Note that when the hidden lines are drawn you cannot zoom or pan in the drawing.You must first type REGEN at the command line. Setting hidden lines for plottingpurposes is done using a different set of commands, which is discussed further inthe Plotting Hidden Lines page on our website.



Next, you will make a change to the ductwork and update your duct sizes anddouble-line.

1.5.2 Editing and Recalculating Ducts

To edit a duct system's sizing criteria, go to

DM HVAC Duct Centerlines Query Duct

When asked to select a duct to query, select the first duct in the system in which youwish to change the sizing criteria. For the tutorial, select the first supply duct, whichshould have a circle P at its beginning. When the Duct Information dialog boxopens, set the Shapes to Round to Flat Oval as shown and highlighted in yellow in thescreen shot below.

To edit other features of ducts in a system, go to

DM HVAC Duct Centerlines Edit Multiple Ducts

When the Duct Settings dialog box opens, type "12" for the Maximum Depth asshown and highlighted in yellow in the screen shot below. Then press Edit a DuctBranch.



Design Master HVAC will take you to the drawing and ask you to select a duct toedit. Select the same duct you edited using the Query Duct command. With the newsetting, when the ducts in the supply system are sized, they will first be sized to beround. When they reach the new maximum depth of 12 inches, they will then besized to be flat oval ducts with a depth of 12. The width will be determined by theairflow in the duct. Because of this, the ducts in that system need to be resized andthe double line redrawn. To recalculate, go to

DM HVAC Ductwork Calculations

The Duct Calculations dialog box will appear. Make certain the Ducts in a Systemoption is selected, then press Calculate CFM, Size Ducts, and Calculate Pressure.Design Master HVAC will prompt you to select a duct in the system you wish tocalculate. Select a blue supply duct. Design Master HVAC will take a few momentsto calculate the CFM and pressure, size the ducts, and draw the double line all inone step. Your drawing should now match the one shown below.



Congratulations! You now know how to perform the basic ductwork calculation anddouble line functions using Design Master HVAC.

See Sections and 3D for the next tutorial.

1.6 Sections and 3D

This tutorial will teach you how to create sections through the ductwork and how toview the drawing in 3D.

To begin this tutorial, go to the Creating Sections section.

1.6.1 Creating Sections

The first step in creating a section is to select the ducts to include. In drawing M1, goto

DM HVAC Sections and 3D Drafting Create Sections



The Duct Sections dialog box will appear as shown below.

Press New Section. The New Section dialog box will appear as shown below.

Type "A" for Section Name and press OK. You will be returned to the Duct Sectionsdialog box, which will now contain section A under Section Names as shown below.

Make certain section A is selected as shown above and press Add Ducts. DesignMaster HVAC will take you to the drawing and prompt you to select objects. Draw acrossing box around the ducts in Conference 102 as shown below.



When all the ducts in Conference 102 are included in the crossing box as shownabove, specify the opposite corner of the crossing box and press ENTER. You willagain be returned to the Duct Sections dialog box. Press Draw Cutline. DesignMaster HVAC will prompt you to select the first point for the section cutline. Select apoint to the right of Conference 102 as shown below (the finished cutline ishighlighted in yellow). You will then be prompted to select the second point. Click toindicate a second point that will create a cutline similar to the one shown andhighlighted in yellow in the drawing below.



Finally, Design Master HVAC will prompt you to pick a point on the side to face (asshown above). Click on a point to the left of the cutline. You will be returned to the Duct Sections dialog box. Press Exit. Your drawing should now match the oneshown below.



You now have defined your section. Next, you will insert the actual section on adrawing.

1.6.2 Inserting Sections

The section created in the step above will be inserted into drawing M2. Beforeinserting the section you will need to set the alignment point. See Start New Projectfor a review of how to set the alignment point. For the M2 drawing, you may set thealignment point wherever you'd like. Once the alignment point has been set, to insertthe section, go to

DM HVAC Sections and 3D Drafting Create Sections

When the Duct Sections dialog box opens, press Set Insertion Point. Design MasterHVAC will take you to the drawing and prompt you to indicate the insertion point.Click to place the left-hand corner of elevation 0 for the section. Your drawing shouldmatch the one shown below.



To view the section as it will be plotted, with hidden lines, type HIDE at the commandline. Your drawing should now match the one shown below.

Note that when the hidden lines are drawn you cannot zoom or pan in the drawing.You must first type REGEN at the command line. Setting hidden lines for plottingpurposes is done using a different set of commands, which is discussed further inthe Plotting Hidden Lines page on our website

You now have inserted your section. Next, you will view your original drawing in 3D.

1.6.3 Viewing Drawing in 3D

To view the ductwork in 3D, go back to drawing M1 and go to

View Viewports 2 Viewports

You will be asked for a configuration option. Select "Vertical". Place the cursor in theright viewport to activate it. Go to

View 3D Views SW Isometric



Zoom in until your drawing matches the one shown below.

To view the right drawing in 3D, go to

DM HVAC Sections and 3D Drafting Draw 3D Ductwork

Design Master HVAC will prompt you to draw a crossing box around all the ducts todraw in 3D. In the left view port, draw your crossing box over all the ducts in thedrawing.

To view the hidden lines, select the right viewport and type HIDE at the command line.Your drawing should match the one shown below.



You may use the DM HVAC Layer Management commands to turn the ductcenterlines, double lines, and 3D layers on and off. Remember that when the hiddenlines are drawn you cannot zoom or pan in the drawing. You must first type REGEN atthe command line. Setting hidden lines for plotting purposes is done using a differentset of commands, which is discussed further in the Plotting Hidden Lines page onour website.

Congratulations! You now know how to perform the basic 3D functions using DesignMaster HVAC.

See My Project has a Database for important notes about working with your projectdrawing and database files.

1.7 Project Drawing and Database Management

Design Master HVAC allows you to create intelligent entities on your drawings. Thisintelligence is what makes Design Master powerful, as it enables the software toperform many engineering calculations, eliminating the need to complete them byhand. These intelligent entities are stored in both your project drawings and in aproject database. This database is a new concept for many of our customers andthus may require you to adjust how you think about, organize, and handle yourprojects and drawing files.

When you start a new project in a drawing using Design Master HVAC, a databasefile will be created in the same folder as the drawing. The file will be nameddm_hvac.dm. If you entered a project name when starting the project, that will beincluded at the end of the file name (e.g. the project name "Seattle" will create a filenamed "dm_hvacSeattle.dm"). This is the database file where all of the informationabout your project is stored. Your project drawings are now connected to thisdatabase file, and the information contained in the drawings and the database mustmatch.

Changes to your drawings require that you consider the implications those changeshave on the database. The following is a list of common scenarios and how youshould handle them when working on a Design Master HVAC project:

Multiple Projects

Each project needs to be in a separate folder. There will be one dm_hvac.dmdatabase file in each folder. All of the drawing files for the project need to be in thesame folder as the database. You should not copy drawings from one project toanother.

Saving Your Changes



Always save your changes to a drawing with Design Master HVAC devices in it.Never close a drawing without saving your changes.

The changes you make to the drawing are immediately saved to the database. If youclose the drawing without saving, the database no longer matches the drawing.

Creating a Backup

To backup your project, copy the whole project folder to a new location.

Simply copying a drawing or copying a database is not enough to backup yourproject; you must have copies of both. Therefore, the simplest way to guarantee thateverything necessary is backed up is to copy the whole project folder.

Alternative Designs

To try an alternative design in your project, make a copy of the whole folder to a newlocation. Treat the alternative design as a separate project.

Copying a Drawing

To copy a drawing that contains Design Master devices, use the DM HVACDatabase Utilities Copy Drawing command. This will create an exact copy of thedrawing in the project folder.

Do NOT use Windows Explorer or the AutoCAD Save As command to make a secondcopy of a drawing in a project!

Renaming a Drawing

To rename a drawing that contains Design Master devices, use the DM HVACDatabase Utilities Rename Drawing command. This will rename the drawing. Theoriginal drawing will no longer exist.

Do NOT use Windows Explorer or the AutoCAD Save As command to rename adrawing in your project!

AutoCAD Crashes

AutoCAD crashes can leave your drawing and your database in an inconsistentstate. This is a special situation that needs to be handled carefully to prevent yourdatabase from being corrupted.

AutoCAD Created a Recover Drawing



If AutoCAD created a recovery drawing, try to open that file. If it opens, compare itwith the original drawing file. Decide which you want to use. If you want to use therecovery drawing, rename the original drawing something different using WindowsExplorer, and rename the recovery drawing to the original drawing name usingWindows Explorer. Run the DM HVAC Database Utilities Coordinate Drawing andDatabase command in the drawing to make the drawing and database match, thencontinue working.

If you choose to work in the original drawing, delete any recovery drawings that werecreated. Run the DM HVAC Database Utilities Coordinate Drawing and Databasecommand in the original drawing to make the drawing and database match, thencontinue working.

AutoCAD Did Not Create a Recover Drawing

If AutoCAD did not create a recover drawing, then you have to open your originaldrawing. Run the DM HVAC Database Utilities Coordinate Drawing and Databasecommand in the drawing to make the drawing and database match, then continueworking.

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