Install Instructions

167
IM-PR 566442 1114 (Design Manual)
B.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 the number of circuits, always round up. Keep the length of each circuit in the same room
equal. For tubing layout around joints in concrete, refer to Section 4.1.2, Handling and protecting tubing.
Exterior Wall
Exterior Wall
Exterior Wall
Exterior Wall
Exterior Wall
Exterior Wall
One-Wall Serpentine
Room has one exterior wall
Two-Wall Serpentine
Room has two exterior walls
Three-Wall Serpentine
Room has three exterior walls
Counter Flow
Room has no exterior walls
Figure B-2a
Figure B-2b
Figure B-2c
Figure B-2d
Maximum Circuit Length
Tubing ≤ 25 Btus / (hr x ft
2
) ≥ 25 Btus / (hr x ft
2
)
⅜" 300' 250'
½" 400' 350'
⅝" 500' 450'
¾" 600' 750'
Table B.1
Calculating number of circuits:
Total amount of tubing ÷ maximum circuit length = # of circuits
Figure B-2
Circuit layout patterns for hydronic radiant floor heating
Table B.2 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 8214
Technical Committee and are based on manufacturers’
recommendations and good engineering practice.
41
Nominal tube size, in Maximum loop length, m (ft)
⅜ 76 (250)
½ 91 (300)
⅝ 122 (400)
¾ 152 (500)
41. ©CSA Group, B214-12. 2012. “Installation Code for Hydronic Heating Systems” Table 1
Maximum loop lengths
(CSA B214 Table 1)