Is there a guide to programming the VT8W
Looking for a download pdf for programming the VT8W wall control. I have an error code E1, and think it was something I did while changing the programming.
Thank you for your question on the model VT8W wall controls for the ERV and HRV units. We do have a users guide for the VT8W. Please contact the Technical Service Department at 800-637-1453 and we can email/fax this to you until we get this loaded onto our website. Thank you for bringing this to our attention and for your patience.
Date published: 2017-08-26
Wire type for connecting to HRV
I can't find anything in the instructions for either the control or the HRV that I purchased that tells what kind of wire to use for installation. I'm installing a system that's separate from my furnace so I'm only connecting from the VT8W to the HRV unit. What wire spec should I be looking for? Gauge? Colors? (Assuming Red, Black, Green, Yellow) Can I use typical alarm wire which seems to be 22 gauge (with white instead of yellow)? Thanks.
Thank you for your question on the VT8W and your HRV unit. This is a low voltage circuit, so any #18 to #22 gauge wire is acceptable. If you have further questions, please contact Technical Support directly at 800-637-1453.
Date published: 2018-01-16
How much ventilation is needed?
I'm trying to understand how much ventilation our new house really needs. Factors that need to be taken into consideration when thinking about this include:
- The oxygen consumed, and carbon dioxide released, by humans and pets
- The oxygen consumed and combustion products produced by gas stoves, etc.
- Other factors that could impact interior air quality, e.g. using enamel paint
But for purposes of this question I'd like to focus on the first bullet point above - the air that is needed for human consumption.
The user guide for the VT8W control says that one can select the Recirculation mode if "inside air is too dry in heating season". It also offers an Intermittent mode where ventilation occurs for 20 minutes out of every hour.
The option to use Recirculation mode suggests that it's okay to do without ventilation, but the whole purpose of the HRV is to supply ventilation. This confuses me. How much ventilation does one really need? Should Recirculation only be used when we'll be away from our house?
I found one source on the internet that recommends 20 cfm of fresh air per occupant, but this seems rather excessive. Average human breathing is about a fifth of a cubic litre of air in each breath, and around 15 breaths per minute. So we breath about 3 cubic feet of air in and out per minute. Why would we need 20 cubic feet of fresh air every minute to make up for this?
Another source says that normal air contains about 20% oxygen and exhaled air contains about 15%. So we're consuming 5% of the air that we breath in and out. In other words, we're consuming about a third of a cubic foot of oxygen each minute. How many cubic feet of fresh air has to be introduced into a house to maintain the oxygen level at around 20% if there's one person in the space?
Thank you for your question on the Broan IAQ units. We use the ASHRAE 62.2 as a bases for ventilation. 62.2 version, CFM can be calculated using a formula as follows, CFM = .01 x floor area (in square feet) plus 7.5 x (number of bedrooms + 1). If you have further questions please contact Technical Support directly at 800-637-1453.
Date published: 2018-02-05
Can this control be programmed to operate at different speed at different period during the day?
Run high speed during the day and low speed at night.. I have a client that is very sensitive to noise when they sleep.
Thank you for your question on the Broan VT8. The VT8 cannot be operated at different speeds at different periods of the day by presetting the control. If you have further questions please contact our Technical Support at 800-637-1453.
Date published: 2017-05-02