Edwards Signaling ReadySet - Manual (Page 21)

Chapter 3: Installation and configuration
ReadySET Aspirating Smoke Detection System Installers Handbook 13
System design
Pre-engineered piping designs simplify the installation of the detector pipe network.
The following criteria ensure that the airflow and transport times are within the design of
the detector. The design parameters listed below must be adhered to for all pre-
engineered pipe designs. Pre-engineered piping networks should not exceed the
transport time requirement of 120 seconds. During the system test, transport times are
often less than 55 seconds.
• The maximum of three elbows and one pipe tee can be used in any pipe network
design.
• When using a pipe tee, it must be located within 20 feet of pipe from the detector.
• All capillary tubes will have a maximum length of 3 feet and use a 9/64 inch
sampling hole size.
• The first sampling hole must be 10 feet or more from the detector.
• The use of sampling capillary tubes and sampling holes can be mixed in any
combination on the pipe network.
• On branch designs, the same number of sampling holes must be used on each
branch.
Table 1: Sample pipe network parameters
Total pipe
length Max amount
elbows Max sampling
points Sampling
hole size Capillary tube
sample hole size End cap
hole
164 feet 3 10 1/8 inch 9/64 inch 5/32 inch
Note: PipeCAD pipe modeling software is used to design pipe networks outside the
above parameters. Refer to the PipeCAD System Design and Installation User Manual for
complete instructions.
The ReadySET detector employs a fan designed to detect smoke in relatively small
areas. The ReadySET detector is not intended to protect large areas, or to sample from
areas where there may be any difference in airflow rates or pressure differentials. If
detection in environments conforming to these descriptions is required, other AIR-
Intelligence products should be used.
Always locate the sampling points in positions to which smoke may reasonably be
expected to travel. It is usually better to locate the sampling pipe directly in the airflow
(for example, across the return air register of an air conditioning unit).
Note: There is no substitute for carrying out smoke tests prior to installation of pipework
to indicate suitable sampling point location.