ONICON System-10 BTU - Manual (Page 9)

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System-10 BTU Meter Manual 03/15 - 0651-16 / 18323 Page 9
SECTION 3.0: INSTALLATION
The SYSTEM-10 BTU Meter should be installed by experienced plumbers, electricians, and others
with related knowledge and experience in the heating, cooling, and fluid metering fields. ONICON
will be happy to assist with technical recommendations and to provide guidance by telephone and/or
email. On-site field engineering, installation, and service are also available at an additional cost. The
installer should use good trade practices and must adhere to all state and local building, or other,
applicable codes.
Before you begin, clean the external surfaces of all pipes at the installation sites so that they are free of
debris, foreign matter, solids, leak inhibitors, and chemically aggressive substances. Flush the entire
system so that it is free of flux, solder, pipe and tube cuttings and any other free moving particles.
3.1 SITE SELECTION
Careful attention to the site selection for the system components will help the installers with
the initial installation, reduce start-up problems, and make future maintenance easier. For
example, do not install the flow meter where it will be difficult for personnel to perform periodic
maintenance. When selecting a site for mounting the system components, consider the criteria
under Section 1.5: WORKING ENVIRONMENT, as well as the following:
i
IMPORTANT NOTE
Proper site selection is critical to the performance of this Btu meter. Both the flow meter and the
two temperature sensors must be properly located within the piping system in order to ensure an
accurate energy measurement.
• The Main Unit
Find an easily accessible location where wire connections can be made and meter readings
can be taken from floor level. Mount the System-10 enclosure on a vibration free surface.
Avoid locations such as the plenum of a fan coil, heat exchanger or any housing that may
contain electric motors or other strong sources of electrical interference.
• The Flow Meter
When properly installed, the flow meter will only measure flow associated with that portion
of the piping system for which the energy measurement is being made. The flow meter may be
installed in either the supply or return line. Choose the location with the longest straight run of
unobstructed pipe. Please refer to the flow meter installation manual for specific information
regarding the straight run requirements for the flow meter used with this SYSTEM-10 BTU Meter.
• The Temperature Sensors
The two temperature sensors must be located in such a manner as to accurately measure
only the temperature of the supply line entering and the return line leaving the portion of the
piping system for which the energy measurement is being made.
If possible, find an easily accessible location where wire connections can be made from floor
level. This will facilitate any future service. Place the temperature sensors away from strong
sources of electrical noise that might affect the performance of the sensors.
One temperature sensor thermowell will need to be placed in the same pipe with the flow
meter. It should be located on the downstream side of the flow meter. The downstream distance
between the thermowell and flow meter should be at least five pipe diameters, leaving enough
clearance to remove either sensor from the pipe without interference from the other sensor.