Install Instructions

IM-PR 566442 1114 (Design Manual)
26
Application Location
On-Center Spacing
(in., typical)
Nominal Tubing Size
(in., typical)
In-Slab
On or Above-Grade Living
Areas
9" ½" or ⅝"*
Below Grade 9" – 12" ½" or ⅝"*
Bathrooms and High-Output
Areas
6" – 9" ⅜" or ½"
Gypsum-concrete
(thin-slab)
6" – 9" ½"
Garages and Workshops, Inte-
rior Zones of Large Commercial
Buildings or Warehouses
12" ½", ⅝", or ¾"
Dry Mass
Above-Suboor Panels 7" – 10"
5
∕
16
"
Below-Suboor (Residential
Only)
8" ⅜" or ½"
Wall Panels 7" – 10"
5
∕
16
"
Table 1-6 Typical spacing and nominal tubing size, by application
*Used more commonly in commercial applications.
Nominal Tube Size, in Maximum Loop Length, m (ft)
¼ 39 (125)
5
/
16
61 (200)
⅜ 76 (250)
½ 91 (300)
⅝ 122 (400)
¾ 152 (500)
1 229 (750)
Tubing ≤ 25 Btu/hr/ft
2
>25 Btu/hr/ft
2
5
∕
16
" 250 200
⅜" 300 250
½" 400 350
⅝" 500 450
¾" 800 750
Table 1-7 Maximum recommended circuit lengths in feet, assuming a temperature drop of ≥ 20°F, 100%
water, and air temperature of 68°F
Table 1-8 Maximum length of continuous tubing from a supply-and-return manifold arrangement
NOTE: Data for this table were compiled by the B214 Technical Committee and are based on
manufacturers’ recommendations and good engineering practice.
7
7. ©CSA Group, B214-12. 2012. “Installation Code for Hydronic Heating Systems” Table 1
Maximum loop lengths
(CSA B214 Table 1) See clause 14.3.2
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.