Download System Specification (“Ventilation”)

System Specification (“Ventilation”)
April 10, 1994 - TECH 3.5
Residential and Small Commercial
Supply and install a ventilation system as specified by HeatLink® FloorHeat systems or a
qualified mechanical firm, and in accordance with HRAI, ASHRAE & local building
codes. This system is to include the following components and installation guidelines:
- heat recovery ventilator (HRV - also referred to as an air/air exchanger) or
ventilation system capable of providing one half air change per hour.
- HRV or ventilation intake locations in all washrooms, kitchen and laundry areas.
- HRV or ventilation discharge (or fresh air) locations to be supplied with a
minimum of one outlet per floor (see “Note 3” below).
- all intake and discharge grilles to be positioned as high as possible in each
particular location.
- electrician to provide all necessary wiring to ventilation unit and timer switches
for all intake locations (use low voltage wiring or as per manufacturers
specifications).
- dehumidistat to be mounted in main occupancy zone (unless HRV is equipped
with an internal dehumidistat).
Due to the operating characteristics of a HeatLink® FloorHeat system, some of the
unique problems and observations concerning a properly installed ventilation system are
noted below:
1) New construction is becoming increasingly airtight. With HeatLink’s low operating
temperatures we have found in several projects in the past that one of the main
concerns is not so much stale air, but rather excess humidity. For this reason alone it
is essential that an adequate ventilation system equipped with dehumidification
capabilities be provided.
2) As most radiant systems are quiet, we have found that the intake and discharge
locations of an HRV or ventilation unit can be critical if you do not wish to disturb an
occupant of a particular area or room (especially bedrooms or studies). Try to utilize
hallways as much as possible.
3) Placement of discharge locations is critical. As HeatLink ® is a low temperature
system, it creates only a very insignificant amount of convection air currents.
Therefore, a poorly positioned HRV or ventilation unit discharge grille can be quite
uncomfortable as there is no air current which will diffuse the discharge air as it falls
to the floor. Multiple discharge locations should be achieved wherever possible.
4)
If discharge openings are properly positioned, and the number of discharge
locations is sufficient, we have found that in most residential projects a supplementary in
line pre-heat coil is not necessary (determining factors are size, type and make of
equipment chosen). Please check with the HeatLink office and the equipment
manufacturer for clarification.