Install Instructions

IM-PR 566442 1114 (Design Manual)
146
Products Net Heated Area (ft²) Multiplier Estimated Amount
Distribution System
Tubing
5
/
16
" ViegaPEX
Barrier Tubing
7" Spacing 1.9
10" Spacing 1.4
Fasteners
Screws 5.4
Staples 5.4
Groove Tube Silicone 0.02
Panels
7" Spacing 0.4
10" Spacing 0.3
ACPs
7" Spacing 0.07
10" Spacing 0.05
U-Turns 0.04
NOTES: Tubing is sold in coils and fasteners in packages. Installer’s preference determines the choice
between staples and screws. Where multipliers are located in the table, multiply the net heated area by the
corresponding multiplier to derive the estimated amount. For example, if ACPs are specified at 7" spacing
for 1,000 ft
2
of net heated area, the estimated ACPs required are 1,000 x 0.07 = 70. Tubing multipliers
include 10% overage for leaders.
A.3 Creating a material list
This chart is intended for conceptual purposes in developing an initial material list; there may be variations
in each job. You may use Radiant Wizard to create a final material list.
A.4 Layout planning
To avoid waste and to have equal circuit lengths, a carefully planned layout should be done.
First, determine where the manifold should be installed. Remember, the manifold must be accessible. When
calculating number of circuits, always round up. Keep length of each circuit in the same room equal.
Maximum Circuit Length
Tubing 25 Btu/h/ft.
2
or less 25-35 Btu/h/ft.
2
5
/
16
" ViegaPEX Barrier 250 feet 200 feet
Calculating number of circuits:
Total amount of tubing ÷ maximum circuit length = # of circuits
Area = 460 ft.
Unheated Area = 20 ft.
Net Heated Area = 440 ft.
Figure A-3 The remainder of this appendix will reference this sample room in developing layout and
installation examples
Table A-1 Maximum length of continuous tubing from a
supply-and-return manifold arrangement (See Clause 14.3.2)
NOTE: Data for this table were compiled by the B214
Technical Committee and are based on manufacturers’
recommendations and good engineering practice
CSA B214, Clause 14.3.2
The maximum length of continuous tubing from a supply-
and-return manifold arrangement shall not exceed the
lengths specied by the manufacturer or, in the absence of
manufacturer’s specications, the lengths specied in Table 1.
Actual loop lengths shall be determined by spacing, number
of loops, and pressure drop requirements, as specied in the
system design.
40
Nominal tube size, in Maximum loop length, m (ft)
5
/
16
61 (200)
40. ©CSA Group, B214-12. 2012. “Installation Code for Hydronic Heating Systems” Table 1, Clause 14.3.2
Maximum loop lengths
(CSA B214 Table 1)