Techline Cv Winterizing Instructions; Manual Winterization; Compressed Air Winterization - Netafim Techline CV Design Manual

N E T A F I M T E C H L I N E
TECHLINE CV
WINTERIZING
INSTRUCTIONS

TECHLINE CV WINTERIZING INSTRUCTIONS:

Winterizing an irrigation system involves removing enough water to ensure that
components do not crack or break during freezing weather.
Because Techline CV is designed to keep water sealed inside the tubing between
irrigations, it is important that these simple steps be followed.
MANUAL WINTERIZATION (no compressed air blow-out)
• A drain port must be present at all low points in the zone.
• Ports may be a tee or elbow with a threaded plug, a Netafim TLFIG8 or TLSOV
which, when opened, will allow water to drain. If a Netafim "automatic" Line
Flushing Valve has been used, disassemble it.
• If the Techline CV zone is a grid or closed system, the supply and exhaust
headers may contain a significant amount of water because they are either blank
Techline CV tubing, PVC, or poly pipe. It is important to provide drain ports for
these components.
• If the Techline CV laterals dead-end, and are not connected to an exhaust header,
the lateral ends should be opened to drain at the lowest point(s).
• In the event that some water remains in the system, the disc filter should be
disassembled, and the discs removed to allow any water to exit. Leave the filter
disassembled in the event that some water remains in the system.
• In systems where elevation is a concern, install a drain port upstream of the filter to
ensure as much water as possible is drained.
• Follow manufacturer instructions for any automatic zone valves.

COMPRESSED AIR WINTERIZATION

Follow the same initial procedures for a Techline CV zone as you would for a zone of
overhead sprinklers.
Note: Techline CV fittings are rated to 50 psi without clamps, so the air pressure
must be adjusted according. It is air volume, not pressure that is effective when
winterizing in this manner.
• The pressure regulator, which is normally installed in the valve box along with
NOTE
the zone valve and filter regulates water, not air pressure. Air pressure should be
regulated to 50 psi or less.
• The drain ports, (a fitting with a threaded plug, a Netafim TLSOV, TLFIG8, or
Netafim Line Flushing Valve), which are normally installed as far away from the
water source of the zone as possible, must be open. Unscrew and disassemble
any "automatic" Line Flushing Valves.
• With all drain ports open, compressed air should be applied until no water is seen
exiting the zone.
C V D E S I G N G U I D E
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