Install Instructions

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IM-PR 566442 1114 (Design Manual)
(CSA B214 Clause 12.1.2)
Radiant oor heating panels shall be protected
with a high-limit control set 11°C (20°F) above
the maximum design water temperature for the
panel to stop the introduction of heat into the
panel. The high-limit setting shall not exceed
the temperature rating for the pipe.
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13. ©CSA Group, B214-12. 2012. “Installation Code for Hydronic Heating Systems” Clause12.1.2
1.12.3 Variable temperature
A variable temperature system adjusts the
system’s supply temperature based on the
anticipated heat load, which is estimated based on
outdoor temperature, indoor temperature or both.
Advantages to this temperature control approach
include the following:
• Promotion of low-temperature heating,
which can increase the efficiency of the
heating system (exception: low-efficiency,
non-condensing boilers)
• Ability to avoid overheating a space by
reducing supply temperatures to respond to
dynamic heating loads
• More even heating of surfaces (less striping
effect) from longer cycles
• Easy integration with high-efficiency,
modulating boilers
An outdoor or indoor reset control is specified
in a variable temperature system to anticipate
changes in heating load and to adjust the supply
temperature to respond accordingly. The outdoor
and indoor reset controls both serve the function
of increasing supply water temperature when they
measure a drop in ambient temperature (outdoor
and indoor, respectively), and decreasing supply
water temperature when they detect an increase in
ambient temperatures. By anticipating heat loads
and providing more precise control of a space,
reset controls assist with providing a faster system
response time and with avoiding overheating of
a space. An example of an outdoor reset control
curve is provided in Figure 1-35.
Figure 1-35 Outdoor reset curve
1.12.4 Radiant floor heating panels