Onix Tubing Installation Manual

page 14 Watts Radiant: Onix Installation Manual
larger manifolds, 1-1/4" to 6" i.d.,
are available.
Step 4:
Heat Loss Calculation
Conventional heat loss calculations
can be used to size radiant heating
equipment; however they tend to over-
state the actual heat loss that a radiant-
ly heated building experiences. In
addition, the use of these unadjusted
calculations will tend to oversize boil-
ers, circulators, and piping, as well as
the amount of radiant piping required.
There are four major factors that
reduce heat loads as compared to con-
ventional heating systems.
1. Lower indoor air temperatures
can be maintained for greater
human comfort. When the floor is
radiantly warmed, the human body
does not need as warm an air tem-
perature to stay comfortable. With
radiant heat, the indoor thermostat
can be set 2¡—3¡ lower.
2. Indoor air movement and tempera-
ture gradient is greatly reduced.
This reduces heat loss through
the ceiling.
3. Due to heat storage in the radiant
floor and surrounding walls, peak
heating loads are reduced. This
effect is greater in more massive
construction.
4. Because of factors one and two,
infiltration losses are also less. This
means buildings with higher air
infiltration rates will save more
energy if fitted with a radiant floor
delivery system, compared to a
forced air (convective) heating
system.
Due to these factors, a typical radiant
heated building often requires
10% to 30% less energy to heat than a
conventional convective system.
RadiantWorks automatically accounts
for these factors to properly and
accurately size any radiant project.
Using RadiantWorks
®
Reports as a Design Tool
For most projects, the radiant design
will be performed using Watts
Radiant s RadiantWorks design soft-
ware. This is an easy, efficient way to
apply the design steps discussed earli-
er. A variety of reports are available
through RadiantWorks, including a
Zone List, an Assumption report and a
Heat Loss report. These reports help to
transfer information about a given
project quickly without unnecessary
guess work.
Supply Line
Return Line
Onix
Manifold
Manifold mounted on side of joist.
Use fasteners, as necessary, to support Onix and to maintain proper bend radii.
Manifold
Onix
SnapClip Fasteners
Manifold mounted in wall cavity.
Use fasteners, as necessary, to support Onix and to maintain proper bend radii.
Manifold Mounting Bracket
Max Flow Base Trunk
GPM Size
12 1"
20 1-1/4"
32 1-1/2"
60 2"
SnapClip Fasteners
Zoning