Step No. 1: You
must be able to see the drain pipes and elbows that
empty waste from your holding tanks. Find how to access to these drain
pipes and elbows in your RV. You must be able to see and touch the drain
pipes and elbows in order to gather the information necessary to select
the appropriate pipe and elbow heaters.
Step No. 2: Note the number of 1˝"- 2" and 3"(3.81-5.08-7.62 cm) diameter
elbows in each of the drain pipe runs from the gray and black holding
tanks up to the knife valve(s). These elbows can be 90°, 45°, 22.5°,
short sweep, long sweep, etc. Each one of these elbows will require its
own protection from freezing. UltraHeat® recommends that you use an
EH-158 Elbow Heater for 1˝"and 2" (3.81-5.08) fittings and EH-313 Elbow Heater for 3" (7.62 cm) fittings. All exposed fittings should have one of these elbow heaters installed for protection from freezing in cold weather.
Step No. 3: Measure the length of all straight drain pipe sections from the gray and
black holding tanks to the knife valve(s). These pipes will be 1˝"- 2"
or 3"(3.81-5.08-7.62 cm) in diameter. The length of each measurement
should include only the straight part of the drain pipe. Make a list of
all of the measurements for each individual section. It may be helpful
to sketch how the entire drain system is configured, from the tank drain
to the knife valve. Each individual section of drain pipe will require a
specific UltraHeat® Pipe Heater to be fully protected from freezing.
Use the UltraHeat® Pipe Heater Application Chart to select the proper
set of UltraHeat® Pipe and Elbow Heaters for each individual straight
section of 1˝" -2" (3.81-5.08 cm) diameter drain pipe based on its
measured length. Some pipes will require multiple heaters and they must
be evenly spaced so that the heat applied will be uniformly distributed
to provide proper freeze protection for the entire straight section of
drain pipe.
Note: The UltraHeat® Pipe Heater Application Chart is designed so maximum spacing between pipe heaters, elbow heaters and the pipe
fittings, (elbows, knife valves, etc...) will be no larger than 2" (5.08
cm).
Note: UltraHeat® Elbow Heaters are also used to protect short sections of
exposed straight drain pipes alone or in combination with UltraHeat®
Pipe Heaters.
