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1214.0 Pressure and Flow Controls
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Direct-fired heat sources
within a closed heating system shall have a low-water fuel
cut-off device, except as specified in Section 1214.3. Where
a low-water control is integral with the heat source as part of
the appliance's integrated control and is listed for such use, a
separate low-water control shall not be required. An external
cut-off device shall be installed in accordance with the heat-source
manufacturer's installation instructions. No valve shall be located between the external low-water fuel cut-off and
the heat-source unit. Where a pumped condensate return is
installed, a second low-water cut-off shall be provided.
Where an automatic
makeup fluid supply fill device is used to maintain the water
content of the heat-source unit, or any closed loop in the system,
the makeup supply shall be located at the expansion tank
connection or other approved location.
A pressure-reducing valve shall be installed on a makeup water feed line. The pressure of the feed line shall be set in accordance with the design of the system, and connections to potable water shall be in accordance with Section 1202.0 to prevent contamination due to backflow.
A pressure-reducing valve shall be installed on a makeup water feed line. The pressure of the feed line shall be set in accordance with the design of the system, and connections to potable water shall be in accordance with Section 1202.0 to prevent contamination due to backflow.
Provisions
shall be made to control zone flows in a multi-zone hydronic
system where the closing of some or all of the two-way zone
valves causes excess flow through the open zones or dead-heading
of a fixed-speed pump.
Where a differential pressure bypass valve is used for the
purpose specified in Section 1214.5, it shall be installed
and adjusted to provide bypass of the distribution system
when most or all of the zones are closed.
Provision shall be made for
the removal of air in the heat-distribution piping system. The
air-removal device shall be located in the area of the hydronic
piping system where air is likely to accumulate. Air-removal
devices shall be installed to facilitate their removal for examination,
repair, or replacement.
Exception: Drainback type solar thermal systems shall not
require an air-removal device.
To assist with the removal
of entrained air, an air-separation device shall be installed in
hydronic systems. The device shall be located in accordance
with the manufacturer's installation instructions or at the point
of no mechanically-induced pressure change within the distribution system.
Secondary loops that are isolated
from the primary heat-distribution loop by a heat
exchanger are closed-loop hydronic systems and shall have an
expansion tank in accordance with Section 1209.0, an air-removal
device in accordance with Section 1214.6, and an
air-separation device in accordance with Section 1214.7.
Related Code Sections
1214.0 Hydronics, Pressure and Flow Controls
with the manufacturer's instructions.
A means for balancing and flow control shall include
the piping design, pumping equipment, or balancing devices ...
1214.0 Hydronics, Pressure and Flow Controls
with the manufacturer's
instructions. A means for balancing and flow control shall
include the piping design, pumping equipment, or balancing
devices ...
1214.2 Hydronics, Low-Water Control
a low-water control is integral with the heat source as part of
the appliance's integrated control and is listed for such use, a
separate low-water ...
California Mechanical Code 2019 > 12 Hydronics > 1214.0 Pressure and Flow Controls > 1214.2 Low-Water Control
1214.1 Hydronics, Balancing
with the manufacturer's instructions.
A means for balancing and flow control shall include
the piping design, pumping equipment, or balancing devices ...
California Mechanical Code 2016 > 12 Hydronics > 1214.0 Pressure and Flow Controls > 1214.1 Balancing
1214.1 Hydronics, Balancing
with the manufacturer's
instructions. A means for balancing and flow control shall
include the piping design, pumping equipment, or balancing
devices ...
California Mechanical Code 2019 > 12 Hydronics > 1214.0 Pressure and Flow Controls > 1214.1 Balancing