That a downloaded file has not been altered

Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. By Tim Fisher. Tim Fisher. Tim Fisher has more than 30 years' of professional technology experience. He's been writing about tech for more than two decades and serves as the VP and General Manager of Lifewire. Tweet Share Email. Are all checksums unique?

How do checksum calculators calculate checksums? How do I validate multiple checksums at once? Was this page helpful? Thanks for letting us know! Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. To download the email images that are located on the Internet, Outlook relies on a properly configured Internet Explorer. Another common issue is that Internet Explorer has been set to Work Offline. There is really no need to change the default picture download settings in Outlook in order to download the pictures from the Internet.

The OutlookSecureTemp folder is the folder that Outlook uses to save attachments to when they are opened directly from a message within Outlook. It is located in a semi-random location and is not always cleaned up properly after closing the attachment, the message or Outlook.

If you have been playing with the display settings within Outlook or Word, then it could be that you have mistakenly enabled the option; Show picture placeholders. The safest place to get apps for your Mac is the App Store. If you download and install apps from the internet or directly from a developer, macOS continues to protect your Mac. When you install Mac apps, plug-ins, and installer packages from outside the App Store, macOS checks the Developer ID signature to verify that the software is from an identified developer and that it has not been altered.

By default, macOS Catalina and later also requires software to be notarized, so you can be confident that the software you run on your Mac doesn't contain known malware. The warning messages displayed below are examples, and it's possible that you could see a similar message that isn't displayed here. Please use caution if you choose to install any software for which your Mac displays an alert. By default, the security and privacy preferences of your Mac are set to allow apps from the App Store and identified developers.

For additional security, you can chose to allow only apps from the App Store. Click the lock and enter your password to make changes. Per table When inputting custom curve data points for a cooling System, as the outdoor drybulb temperature increases, the output of the heat pump should decrease since the cooling system will have less capacity at higher temperatures.

Edit the data for the Central System on the Curves tab such that at higher temperatures, the system will have less output than at the lower temperatures. When inputting custom curve data points for a cooling System, as the outdoor drybulb temperature increases, the efficiency of the cooling system should also decrease since the cooling system will operate at lower efficiencies at higher temperatures. Edit the data for the Central System on the Curves tab such that at higher temperatures, the system will have a higher kW input than at the lower temperatures.

When inputting custom curve data points for a cooling System, you must enter data for the cooling system that includes one data point 85F or below, and one point F or above.

Modeling of heat pumps requires data be included for the system heating output at both the 47 and 17 degree AHRI outdoor design rating conditions. Manufacturers publish both sets of data in their literature, and this same data is also listed in the AHRI listing and sometimes in the CEC equipment directories.

When a heat pump is input, the software requires that the heating capacity of the unit be given at two rating conditions. The first rating condition is when the outside ambient drybulb is at 47 degrees F. The second rating condition is when outside conditions are at 17 degrees F. At the Central System library, in the Heating tab, enter a value for the Heat Pump heating output at the 17 degree condition. Variable Refrigerant Flow VRF system modeling includes describing both the outdoor condenser unit of the system as well as the indoor evaporator units at each of the zones.

Each manufacturer places restrictions on how much indoor unit capacity can be coupled to a particular outdoor unit. EnergyPro will check how much indoor unit capacity has been specified and ensure that this falls within the acceptable limits of the VRF manufacturer. You should review the VRF modeling guide at www. Verify the total capacity of each outdoor condenser unit that has been input at the System level of the building tree.

Navigate to each Zone under that particular system, and verify the capacities of the indoor units that have been input at the Mechanical tab for the Zone. This total installed capacity of indoor units must fall within the parameters of the manufacturer. When inputting the efficiency of the HVAC system, ensure the value entered is consistent with the type of system being modeled.

If it is small furnace, the value would be an AFUE that is in the range of 0. Double check that you have entered this value correctly by selecting the HVAC system in the System level of the Building Tree and reviewing the inputs in the heating and cooling tabs. Each Zone entered into the Building Tree is required to have an Elevation entered for the Zone that describes the distance above the exterior grade of the building.

Thus, a ground floor Zone with a slab on grade would have an elevation that is 0. Each floor of the building will require this value be input.

In addition, each Zone is required to have the Floor to Floor height entered that describes the distance from the Zone floor elevation to the Zone above floor elevation. If the Zone that is above another Zone does not have a floor elevation that is at least equal to the lower floor elevation plus the floor to floor height, this is an error. Each unique level of the building story should have an entry.

Example, Floor 1, Floor2, etc. Review the inputs for Floor Elevation and Floor to Floor Height for each Zone in the Building Story, and ensure these values have been input consistently. Note that it is valid to have a single Zone that encompasses more that one floor of the building, you would simply select the lower story for that Zone.

The heating flowrate for this zone is lower than what is needed to provide the minimum code required ventilation for the zone. At the Zone level of the Building Tree, in the Mechanical tab, compare the Heating Airflow input to the code required airflow reported in this message. Note that while you may have chosen to input lower ventilation rates in the Room Occupancy tab, the code minimum specified by the CEC in the CBECC ACM manual tables will always be used as the minimum so you cannot go below this number.

When modeling Zones, each surface in the Zone must have a unique name. Note that when inputting names, only the first 25 characters that you input are considered, so ensure the names are reasonably short, and unique. At the Building Level of the Tree, navigate to the surface and edit the name so that is it unique. Under the Distribution tab at the System level of the tree, you are given the option of selecting the location of the ductwork.

Without an attic of at least this size, there is insufficient space for the model to include the total volume of ductwork.

You have the option of changing the location of the ductwork by editing this input and selecting another location if your attic area does not meet this criteria. Review the area input for each roof. Also, click on the construction assembly and verify that you have selected a roof construction that includes an attic, and not a cathedral roof type construction.

The control referenced is not valid for the type of occupancy selected for this Zone. Please review the valid applications of this control in Standards Table You can either change the control or change the occupancy at the Zone level of the tree.

If you think you have input a garage, navigate to each Zone in the building tree. Without a crawlspace of at least this size, there is insufficient space for the model to include the total volume of ductwork. Review the area input for each floor. Also, click on the construction assembly and verify that you have selected a floor construction that includes a crawlspace.

The Light Fixture you have selected has included an input below the fixture for an Additional Allowance as described in Table The Additional Lighting Allowance referenced cannot be used on the type of occupancy selected for this Zone.

You can either change the Additional Allowance selection for the light fixture or change the occupancy at the Zone level of the tree. The Lighting Elements in the building tree have an entry for the Fixture Reference Code, as well as the Luminaire listed in the library.

When entering a Reference Code, it has to match the Luminaire in the library throughout the tree. Fixture B would require a different reference code, this is required to build the fixture list as part of the documentation on the forms. In the location listings, you have the option of selecting a location, and also you have the option of editing the location using the User Defined option.

We suggest not using the User Defined feature, but rather that you select a stock location from the listings. In this case you are using a Heat Pump for the boiler and this cannot be modeled. The approach to model an Electric boiler or Heat Pump Water Heater that provides space heating is to treat it as an electric space heater , and indicate no ducts. This is a CEC rule, not a program limitation, so you should consider an alternative system. The software will not auto-size capacities, it is your responsibility to define this number.

The Title 24 Standards mandate that any Nonresidential buildings with more than sqft of Site Built Vertical fenestration cannot use the Center of Glass inputs in the fenestration description. In the Fenestration Library, edit your inputs for the fenestration ratings and either use a Manufactured product, or use Defaults or NRFC rated values in the energy model.

You have left the Floor Area for the room set to zero. A Floor Area entry is required for all Rooms in the building tree. If you double click on the Error this will take you to the Room in the Building Tree where you should enter a valid value greater than zero. When defining openings in a wall that include shading features Overhangs or Sidefins you must define the geometry of the Wall Width and Height as well as the geometry of the Windows and Doors Width, Height as well as the location of the opening on the Wall XPos, YPos.

At the Zone level of the Building Tree, an input is provided for the Story of the building the Zone is assigned to. In that list, each Story is required to have a unique name that describes the particular Story.

As an example, Floor 2 could be used to describe the second story of the building. Each name in this list must be unique, duplicate names are not permitted. Check this list and ensure each Story is assigned a unique name. This Ceiling Height must always be less than the floor to floor height. You are analyzing an Addition alone, and the Existing Floor Area is set to 0. In the case of an Addition, the Existing Floor Area of the building must be entered.

If you are not modeling an Addition alone, navigate to the top level of the tree, and change the Building Type. That other HVAC system has not been defined and must be properly configured for the simulation to run. The cooling flowrate for this zone is lower than what is needed to provide the minimum code required ventilation for the zone.

At the Zone level of the Building Tree, in the Mechanical tab, compare the Cooling Airflow input to the code required airflow reported in this message. The Minimum turndown for this zone is lower than what is needed to provide the minimum code required ventilation for the zone. Note that if you have checked the box for Demand Control Ventilation DCV your terminal box is allowed to turndown the airflow to 0.

When modeling an Underground Surface, the Depth below Grade is a required input and cannot be set to Zero. At the Underground Surface, edit this value to match the depth below grade for the Basement Zone. The surface you have input has an area of zero which is not a valid surface and the simulation will not run. At the system level of the tree, you have input one or more HVAC systems with an identical name.

Navigate to the System level of the Building Tree and edit the name shown. You have input either a window or a skylight into the Building Tree. In that entry, you have selected a Fenestration product from the Fenestration Library. The fenestration selected is the wrong type.

Click on the Fenestration item in the building tree, this will take you into the Fenestration Library. Review the entry for Fenestration Type, if this is a skylight, it needs to be set accordingly.

If it is a Vertical Fenestration product, ensure the appropriate selection is made. Note that if you have both windows and skylights using the same fenestration entry, you will need to create two entries in the library, one for windows, another for skylights. You are modeling a Highrise Residential project and have failed to input the correct number of stories for this occupancy type.

Highrise residential projects are considered four stories or more. At the Zone level of the tree, review each entry for the Floor Number input. You must ensure that this is set to four or more. If your project is in fact less than four floors, you need to change the Zone Occupancy input to Multi-Family and run the Res T24 Performance calculation instead.

At each Zone is an input for the Number of Floors which determines how many stories for this particular zone. So if a zone being modeled included both the second and third floors of a building, it would be set to two since that zone included two floors. Normally you would set this to one and model each floor as a zone. The CEC CBECC engine will not allow this number to be greater than 3, which means the zone you are modeling consists of all three floors of a building.

While you might have a zone that exceeds 3 floors this particular input cannot be greater than 3. You have designated more than one Zone as being an ADU and this is not permitted by the modeling tools.

You must either change the setting in the Zone to no, or you must combine the various Zones designated as being ADU into a single Zone. The area of this surface is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone.

This is not physically possible to have a single surface that is larger than half of all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance. You have either made a mistake in the area of this surface or you have forgotten to input all of the other surfaces in the Zone.

The total area of Interior walls which are adjacent to your Zone is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone. The total area of Interior floors which are adjacent to your Zone is greater than half the total surface area of this zone, which includes both child surfaces and Interior walls and floors which are next to this zone.

You have the option of inputting spaces as Residential garages. This input is handled at the Zone level of the tree under Zone Type. This type of system requires that you input the Zone Terminal Boxes for each zone served by the system. If a zone does not have any terminal boxes, simply input a terminal box that is Constant Volume for the modeling. To input the terminal box, go to the Zone level of the Building Tree, in the Mechanical tab you will select an appropriate Zonal System for the zone.

The CEC does not currently have this type of system implemented in the Compliance Manager but will be implementing it in an upcoming version. For Title 24 permit submittals, you must model the units as a series of minimum efficiency split system heat pumps. The heating and cooling capacity, fan airflow and design power should all come from the indoor unit specs.

You can use the System Multiplier in the Building Tree if any of the units are identical. The heating and cooling efficiencies would be the standard code minimum efficiencies.

You have input an Interior Surface that has a very large surface area. In this case, the interior surface are is larger than the sum of all other surfaces in the Zone it is adjacent to. This is not physically possible to have a single surface that is larger than all other surfaces in a zone, since that zone as a minimum will have ceilings and floors that will prevent this circumstance. Either reduce the size of this surface, or increase the areas of other surfaces in the adjacent Zone.

In this case you are using are not using a Gas Fired unit for the boiler and this cannot be modeled. You cannot select Altered. If you wish to analyze the HVAC system as being Altered, you must input the entire Existing portion of the building into the building tree. You have not input a chiller to serve these coils at the Plant level of the Building Tree.

You have defined equipment in this building that requires a boiler. This could include hot water coils at the air handler, zone terminal box heating coils, or in the case of a water source heat pump, a condenser water loop that requires a boiler. You are required to input a boiler and hot water pumps. When equipment is defined at the central plant such as Boilers, Chillers and Cooling Towers including those used for Hydronic Heat Pumps you must be sure to define the pump associated with that piece of equipment.

To correct this problem, go to the Plant Level of the Building Tree, and go into either the Heating Hot Water, Chilled Water or Hydronic tab and define the flow rate and horsepower for pumps associated with all equipment that has been input.

When inputting Interior Surfaces, you have the ability to indicate the Zone that the surface is Adjacent To as part of the inputs. From there you can edit the Floor Multiplier.

Another option is to edit the Interior Surface and change the Adjacent To setting to be another Zone that has the same Floor Multiplier, or you could even set the surface as Adjacent To itself.

You have defined equipment in this building that requires a cooling tower. This could include water cooled chillers or in the case of a water source heat pump, a condenser water loop that requires a cooling tower.

You are required to input a cooling tower and condenser water pumps. Go to the Plant level of the Building Tree, and in the Chilled Water tab for chillers or in the Hydronic tab for water source heat pumps , input the cooling tower and associated condenser water pumps for the HVAC system. For Underground Walls, you must select a construction assembly from the library which is one of these types, you cannot use conventional frame walls, and CMU walls are also not supported currently.

In the Building Tree, you must either select a different construction assembly that fits this description, or edit the construction assembly you have selected, hit the green Import button and import either a Concrete, ICF or Brick wall from the JA4 selections. It is acceptable to add framing and insulation to the concrete wall once selected, however, in the Res T24 Perf tab. In the Assembly Library, you have forgotten to define the Layers for your construction assembly.

At least one layer must be defined. Go to the Assembly Library on the bottom left of the screen under Libraries, select this assembly and navigate to the Layers tab on the right. Double click on a blank layer and select an appropriate material from the list. Drag and drop this surface from the Garage into the House, and then re-assign the Adjacent To setting for the surface.

When modeling conditioned spaces under Title 24, all spaces are required to be ventilated per the code. At the Zone level of the tree, in the Mechanical tab, you have set the Ventilation to None. Note that the Natural Ventilation choice is only valid for Residential spaces and cannot be used for Commercial spaces.

At the Zone level of the tree, in the Mechanical tab, you have set the source of ventilation as being provided by the HVAC system. The HVAC system is specified as having the fans cycle with the load, which will not provide continuous ventilation, or it has no ducts. At the Zone level of the Building Tree, in the Mechanical tab, choose another source of ventilation, such as a local exhaust ventilation fan.

For other systems, change the Central System option in the Controls tab to have the fan run continuously. At the Zone level of the tree, in the Mechanical tab, you have set the Ventilation to Natural Ventilation.

In the Title 24 Standards section When you select the Zone Occupancy and Ventilation function in the General tab, this information is determined. One choice is to select a different Ventilation function for the Zone. Go to the Zone and click on the General tab and click the Select button to change the Ventilation function. The other choice is to go to the Zone and click on the Mechanical tab and specify an exhaust fan that will provide the exhaust rate shown on that tab. Title 24 Standards section To correct this, go to the Zone level of the Tree, Mechanical tab and select a lower duty rating for the hood.

The other choices are not valid in this application. You can either uncheck the box indicating this is a Central system, or change your selection under Distribution.

Any other selections in that list fall under Nonresidential occupancies. The Outdoor Condenser is defined at the System level of the tree, and each Indoor Evaporator unit is defined at the Zone level of the tree.

Each Zone is required to have an Indoor unit defined. To define the indoor unit, go to the Zone level of the Building Tree, and in the Mechanical tab, click on the Zonal unit. Select an Indoor unit that has the type specified as Variable Refrigerant Flow. When entering a light fixture in the Building Tree, it is a requirement that you input the Reference Code for that fixture. Typically, this will be indicated on the lighting fixture schedule on the plans.

This edit would be made by removing the exhaust fan from the Zone level of the Tree, and inputting it as part of the HVAC system, which is one level up in the building tree.

At the Zone level of the tree, Mechanical tab you have specified that the ventilation will come from the HVAC system under the input for Ventilation Type. The code does not permit the use of the HVAC system as a source of ventilation, you must provide a dedicated ventilation system to ventilate a Hirise Residential Occupancy. You have chosen to use an Exhaust Fan to provided the mandated Outside Air Ventilation for your zone.

You are required to define the Airflow for the exhaust fan, as well as the motor fan power. At the Zone level of the Building Tree, Mechanical tab, input a valid exhaust fan that will be large enough to meet the ventilation required for this zone.

This type of system has a maximum fan power limitation of 0. You can either change your system type to something other than a ducted Gas Furnace, or you must go to the System level of the Building Tree and in the HERS tab set this value to 0.

When modeling a space designated as a Parking Garage area, you are required to set the Occupancy to Unconditioned. When modeling Closed Circuit Cooling Towers, the setpoint on the tower must be at least 10 degrees higher than the outdoor summer drybulb temperature to ensure a stable simulation.

When modeling Closed Circuit Cooling Towers, the simulation requires a maximum Delta T of 15 degrees F across the air side of the tower. To accomplish this the fan CFM must be kept to a minimum level to prevent the Delta T going above 15 degrees.

Basically, the program puts all the zones onto a single thermostat. You can input an average ceiling height if necessary.

However, the CBECC simulation does not allow these zones to have multiple exhaust fans, and they must all be on the first zone. This number must be greater than the SRE rating. At the system level of the building tree, in the residential tab, you have input a Whole House the CEC uses the term Ventilation Cooling , the CFM rate for this fan exceeds a simulation limit of 3.

You must lower this airflow rate to simulate this home. A typical value would be in the range of 1. When modeling a single family project, the number of bedrooms is input at the Zone level of the Building Tree, Dwelling units tab. Each Zone can have bedrooms input. Double check the total number and ensure this is correct. Note this is a warning, so it is acceptable to have a large number of bedrooms.

Title 24 Section You have chosen to change those design conditions to a different criteria than what is specified in the code. Click on the Calculations, bottom left and you will see the list of calculations appear in the list above. Select Loads from the list and on the right you will see the Options. The Options should be set as follows:. Taking this approach when doing Prescriptive compliance is not appropriate since Prescriptive requires you to document the installed lighting fixtures, not just indicate the LPD.

This may be because you forgot to input light fixtures into the room, or you deliberately set the value to zero. Check your inputs at the Zone level of the Building Tree, Lighting tab for correct inputs. Verify the Rooms have light fixtures added. It is acceptable to have a Ceiling Height less than 7 feet or greater than 20 feet for a Zone, but this is reported as a warning to ensure you have not made an input mistake.

While it is acceptable to deviate from this number for non-Title 24 calculation purposes, for Title 24 purposes this input will be ignored and the CBC value will be used. At the Room level of the Building Tree, Occupant tab, your input for the ventilation rate is lower than the value in the Standards. While this is acceptable for non-Title 24 purposes, this input will be ignored for Title 24 purposes and the value from the Standards will be used.

For instance, you may have selected this assembly in the tree under the Slab On Grade entry, then modified the type in the library to be a raised floor.

Click on the Libraries selection at the bottom left, select the assembly in the Assembly Library and change the type by using the green Import button and selecting the correct type. Prescriptive compliance specifies things like maximum U-Factors for walls, roofs, floors and windows, as well as maximum Solar Heat Gain Coefficient values and minimum Visible Transmittance values. Please review Section Prescriptive compliance specifies a maximum U-Factor rate of heat loss for opaque surfaces including Walls, Roofs and Floors.

You must thermally improve this component by adding more insulation to the construction assembly. Based upon the Climate Zone of this home, the simplified Prescriptive compliance approach requires the installation of a Cool Roof for the new roof in the addition. The roof must have a minimum Solar Reflectance as outlined in Section The roof must have a minimum Thermal Emittance of 0.

Based upon the Climate Zone of this home, the simplified Prescriptive compliance approach requires the installation of an Attic Radiant Barrier for the new attic in the addition. At the Construction Assembly editor, check the box for Radiant Barrier in Attic to indicate this feature. The simplified Prescriptive compliance approach for additions is limited to additions that are 1, sqft or less, however, additions greater than sqft now require QII and HERS verification.

As such, you cannot use the simplified approach. For additions larger than sqft, you will be required to use the Performance approach, since this addition will required HERS registration and testing for the QII inspections and IAQ fans, and possibly other measures.

The simplified Addition and Alteration methods allow for no registration, and as such cannot be used in this case. Your options would be to use the Performance Approach which will still required registration or indicate the HVAC is not being altered, and then submit a separate document via a HERS provider see www. Modifications to the HVAC duct system that either involve altering the existing ducts, or extending the ducts more than 40 feet require that the project be registered with a HERS provided.

Your options would be to use the Performance Approach which will still requires registration or indicate the ducts are not being altered, and then submit a separate document via a HERS provider see www. You can either decrease your new window area altered windows do not count or use the performance approach for the alteration calculation.

When doing an addition over sqft or a new home, Prescriptive compliance requires all roofs have an attic and a radiant barrier. If your roof has no attic, you must use the Performance Approach for compliance. At the Construction Assembly editor, edit the roof assembly to include an attic.

Title 24 requires the installation of a High Performance Attic as describe in Section You need to add either R-6 tile roof or R-8 other roofs for the exterior insulation, or R tile roof or R other roofs for the interior insulation in the JA4 tab of the construction assembly editor. In addition, you must have the cavity insulation at R or higher. Title 24 does not permit you to install a new electric resistance or gas tank style water heater as part of an addition, when using the Prescriptive Approach to compliance.

You must select either a Gas Tankless or Heat Pump water heater to show compliance using this method. When doing a simulation with the EnergyPlus based CBECC engine, the software generally expects that the airflow rate on the cooling system be within a certain range. The valid range for a successful simulation is going to be a cooling system that has a cfm airflow to tonnage ratio between and cfm per ton. Review the Cooling output of the system and the airflow rate of the system for conformance with this rule in the Central System library.

Either change the cooling output tonnage or the airflow rate CFM to ensure the system falls within this range should the simulation fail to run. When an Overhang or Sidefin has been specified on a window in a given wall, it is a requirement that a complete set of inputs for the wall, and all surfaces in that wall windows and doors be provided. Inputs needed for the walls, windows and doors include the Area of the surface and the Width and Height of the surface.

The Width and Height must equal the Area of the surface. In addition, each window and door must include an X and Y input describing the location of the bottom left corner of the surface relative to the bottom left corner of the wall as viewed from the outside.