Appendix A: Frequently Asked Questions
Q: Why are some actions on the Monodraught HVR® navigator greyed out?
A: If the action is greyed out but also has a small padlock icon shown on its checkbox ( 
), this indicates that you do not have a suitable view license to carry out that action. See Requirements for using HVR in the Virtual Environment for more details on the licenses required to use the HVR integration within the VE.
If the padlock is not displayed but the action remains greyed out, this means the action requires you to tick one or more previous actions (therefore acknowledging that you have performed them) before you can carry out the action.
Q: I have a number of rooms contained in one HVR unit group. I want one of these rooms to use slightly different HVR properties (e.g. operation profile) to the others – how can I do this?
A: All rooms assigned to an HVR unit group will share the same HVR properties. If you want one or more of the rooms to use tweaked values, you must create a duplicate of the unit group, tweak the relevant values in that duplicate group, then re-assign the appropriate rooms to that duplicate group instead. See Duplicating Unit Groups for guidance on how to achieve this.
Q: Can I have different HVR units within the one room (e.g. an HVR Z unit and an HVR X unit)?
A: This is not currently possible – for modelling within the VE, a room can only be assigned to a single HVR unit group (and therefore a single unit type). It is advisable that is only done for rooms which can be separated into two independent rooms with a folding partition or such like. In this instance, it is recommended that the rooms are modelled as two separate rooms.
Q: Do I need to use the Monodraught HVR® navigator workflow to apply HVR to my model, or can I do it myself?
A: The navigator acts as a guide to best-practice and offers the most straightforward workflow for applying HVR to your model. However, you can import HVR components from the source library, assign rooms to the unit groups, set which openings are used by the HVR units and so on without using the navigator. The only step that specifically requires the use of the navigator is the Apply HVR® assignments to ApacheHVAC system files action, used to add the HVR assignments to an HVAC network file prior to simulation. It is recommended that you follow the navigator for convenience and practicality, unless you have a specific situation where you need to do otherwise.
Q: I have an external louvre that is a different size to those specified for the HVR system. Can I still use this or does this need to be changed?
A: The Monodraught HVR uses louvres of 900mm x 300mm. It is recommended that the louvre proportions are designed to match the HVR as closely as possible – a warning icon will be displayed on rooms that do not use this louvre size, but simulation will still be possible.
Q: How do I utilize a cross ventilation strategy within a room assigned with HVR systems?
A: Assign any additional external opening windows and/or louvres, as detailed within the earlier sections of this guide, either on the same elevation that the HVR units will be located, or to the opposite elevation of the room. For exhaust path that will be into another room, a door with a suitable air transfer profile will need to be created and assigned
Q: I would like to locate the HVR system on an internal wall to draw air in from a central atrium, but the Navigator only allows the system to be assigned to an external façade.
A: The HVR system is designed to operate utilizing external air and should only be located on an external façade of a room. The design and comprehensive control strategy of the systems has been developed to allow wintertime air mixing/tempering to minimize any cold drafts and maintain a suitable minimum temperature of the supply air.
Q: Does the simulation of HVR X+ units take into account a heating coil?
A: The prototype HVAC network used in the VE to simulate HVR X+ includes a heater coil component, it is switched on by default.
