Install Instructions

IM-PR 566442 1114 (Design Manual)
102
Tubing Outer
Size (in)
Max Circuit
Length (ft)
Snow Melting Load (Btu/hr/ft
2
)
100 150 200 250 300
Recommended Tubing Spacing (in)
⅝" 200 12 12 9 6 6
¾" 300 12 12 9 6 6
Table 5-4 Recommended tubing spacing and maximum circuit length as a function of snow melting load
and tubing size.
Snow Melting Load
(Btu/hr/ft²)
Tubing Spacing (in)
6 9 12
Fluid Supply Temperature (°F)
100 100 100 103
150 100 106 128
200 108 131 N/A
250 133 N/A N/A
300 158 N/A N/A
Table 5-5 Recommended fluid supply temperature as a function of tubing spacing and snow melting load.
Assumes a 30°F temperature drop across the system.
5.3 Calculating the tubing spacing
Decreasing the tubing spacing will allow the
snow melting system to operate at lower
fluid temperatures while meeting the heat
output requirements. Use Table 5-4 to identify
recommended tubing spacing.
Procedure:
1. Find the tubing size in the first column of
Table 5-4.
2. Follow to the right and read the
recommended tubing spacing under the
column representing the heat load.
Example:
Tubing size: ⅝"
Snow melting load: 200 Btu/hr/ft
2
Recommended tubing spacing: 9"
NOTES:
• Space tubing 1" closer for each inch of
concrete cover over 2".
• Space tubing 2" closer for each additional
inch of pavers > 2⅜" pavers.
• Space tubing 1" closer for asphalt
applications.
• Minimum recommended spacing 6"
5.4 Calculating the glycol solution supply
temperature
Use Table 5-5 to calculate the glycol solution
supply temperature.
Procedure:
1. Find the snow melting load in the first column.
2. Follow to the right and read the
recommended fluid supply temperature under
the column representing the selected tubing
spacing.
Example:
Snow melting load: 200 Btu/hr/ft
2
Tubing spacing: 9"
Fluid supply temperature: 131°F
NOTE: Fluid supply temperature of 130°F is typical
for snow melting applications.