Onicon SYSTEM-20 Operating instructions

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www.onicon.com • [email protected]
SYSTEM-20 BTU METER
Installation and Operation Guide
03-18
2051-1 / 36985
For Software Version 0.1.15 and Higher

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 2
SAFETY INFORMATION
This meter was calibrated at the factory prior to shipment. To ensure correct use of the meter, please
read this manual thoroughly.
Regarding this Manual:
• This manual should be passed on to the end user.
• Before use, read this manual thoroughly.
• The contents of this manual may be changed without prior notice.
• All rights reserved. No part of this manual may be reproduced in any form without
ONICON’s written permission.
• ONICON makes no warranty of any kind with regard to this material, including, but not
limited to, implied warranties of merchantability and suitability for a particular purpose.
• All reasonable effort has been made to ensure the accuracy of the contents of this manual.
However, if any errors are found, please inform ONICON.
• ONICON assumes no responsibilities for this product except as stated in the warranty.
• If the customer or any third party is harmed by the use of this product, ONICON assumes
no responsibility for any such harm owing to any defects in the product which were not
predictable, or for any indirect damages.
Safety Precautions:
The following general safety precautions must be observed during all phases of installation,
operation, service, and repair of this product. Failure to comply with these precautions or
with specic WARNINGS given elsewhere in this manual violates safety standards of design,
manufacture, and intended use of the product. ONICON Incorporated assumes no liability for
the customer’s failure to comply with these requirements. If this product is used in a manner
not specied in this manual, the protection provided by this product may be impaired.
The following symbols are used in this manual:
!
!
WARNING
Messages identied as “Warning” contain information regarding the personal safety of individuals
involved in the installation, operation or service of this product.
CAUTION
Messages identied as “Caution” contain information regarding potential damage to the product or
other ancillary products.
IMPORTANT NOTE
Messages identied as “Important Note” contain information critical to the proper operation of the
product.
i

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 3
TABLE OF CONTENTS
1.0 INTRODUCTION ...................................................................................................... 5
1.1 PURPOSE OF THIS GUIDE ........................................................................... 5
1.2 TYPICAL SYSTEM-20 BTU METER ............................................................. 5
1.3 STANDARD FEATURES AND SPECIFICATIONS........................................ 5
1.4 ADDITIONAL REQUIRED HARDWARE ....................................................... 6
1.5 WORKING ENVIRONMENT ......................................................................... 6
1.6 WARRANTY & SERIAL NUMBER ................................................................ 7
2.0 UNPACKING ............................................................................................................. 7
2.1 CHECKING THAT YOU HAVE RECEIVED EVERYTHING .......................... 7
3.0 INSTALLATION........................................................................................................ 8
3.1 SITE SELECTION ........................................................................................... 8
3.2 MECHANICAL INSTALLATION ................................................................... 9
3.2.1 Mounting the Enclosure ................................................................. 10
3.2.2 Thermowell Installation................................................................. 11
3.2.2.1 Standard Thermowells ..................................................... 11
3.3.2.2 Hot Tap Thermowells ....................................................... 11
3.2.3 Temperature Sensor Installation .................................................... 13
3.2.3.1 ONICON Standard Temperature Sensor Installation ...... 13
3.3 POWER & SIGNAL WIRING CONNECTIONS ............................................ 15
4.0 SYSTEM-20 START UP & COMMISSIONING ...................................................... 16
4.1 START UP ..................................................................................................... 16
4.1.1 Single and Dual Mode Display Pages ............................................ 17
4.1.2 Additional Display Pages ............................................................... 17
4.2 COMMISSIONING........................................................................................ 19
4.2.1 Commissioning Following Initial Power-up.................................. 19
4.3 SEALING THE METER ................................................................................ 22
5.0 DIAGNOSTIC FUNCTIONS ................................................................................... 22
6.0 BACnet®MS/TP...................................................................................................... 23
6.1 BACnet®OBJECT TYPES............................................................................. 23
6.2 PROTOCOL IMPLEMENTATION STATEMENT ........................................ 23
6.3 DEVICE OBJECT .......................................................................................... 24
6.4 ANALOG INPUT(S) ..................................................................................... 25
6.5 ANALOG VALUE(S) .................................................................................... 25
6.6 BINARY VALUE(S) ...................................................................................... 27
6.7 MULTI STATE VALUE.................................................................................. 28
6.8 TREND LOG MULTIPLE .............................................................................. 29
7.0 MODBUS®........................................................................................................ 30
7.1 MODBUS®MEMORY MAP ......................................................................... 31
7.2 DIAGNOSTIC FUNCTION CODE................................................................. 38
7.3 REPORT SLAVE ID FUNCTION CODE........................................................ 39

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 4
APPENDIX A
A-1 SYSTEM-20 WIRING DIAGRAM
A-2 SYSTEM-20 WIRING TABLES
A-4 CHANGING RS485 SETTINGS OR METER PROGRAMMING AFTER
COMMISSIONING
A-5 SYSTEM-20 DRILLING TEMPLATE
A-6 OUTDOOR THERMOWELL ASSEMBLY

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 5
SECTION 1.0: INTRODUCTION
1.1 PURPOSE OF THIS GUIDE
The purpose of this guide is to provide installation and commissioning procedures, and basic
operating and servicing instructions for the ONICON System-20 BTU Meter.
1.3 STANDARD FEATURES AND SPECIFICATIONS
• Single mode Btu calculations, in either the heating or cooling mode, are totalized, and
displayed.
• Two-pipe dual mode Btu calculations in both the heating mode and the cooling modes, are
totalized and displayed.
• A single isolated RS485 serial interface is provided for BACnet®MS/TP or MODBUS®RTU.
• Three eld congurable pulse outputs may be used for totalization, alarm indication and
mode status.
• Three auxiliary pulse inputs may be used to totalize data from external devices. This data
may also be transmitted via the network interface and viewed on the local display.
• A single eld congurable isolated analog output is provided for energy rate, ow rate or
temperature.
!
WARNING
Only qualied service personnel should attempt to install or service this product. Serious injury
may result from the improper installation or use of this product.
1.2 TYPICAL SYSTEM-20 BTU METER
ONICON’s System-20 is a true heat (Btu) computer, which accepts data from several sensors,
performs a series of computations with that data, and displays and/or transmits the results as an
indication of the amount of heat (Btus) being transferred per unit time or as a totalized amount.
Heat Exchanger
ONICON F-3500
Flow Meter
(F-3500 must be
ordered separately)
Supply Temp
Sensor
Return Temp
Sensor
Supply
Return
FLOW
Power / Output
24V AC/DC Power
RS-485
(BACnet or MODBUS)
3 Pulse Outputs
1 Analog Output
Up To Three
Pulse Inputs for
Water Meter
Gas Meter
Electric Meter
etc.
SYSTEM-20
BTU METER
Made in the USA
ON
I
CON

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 6
1.4 ADDITIONAL REQUIRED HARDWARE
The System-20 must be connected to a suitable volumetric ow meter and a matched pair of
temperature sensors in order to calculate and report heat data.
Please refer to ONICON’s ow meter literature, or contact ONICON for help in selecting the ow
meter that will best t your requirements.
Temperature/Sensors
ONICON Standard Temperature Sensors (32° – 200° F)
Pair of solid state temperature sensors with 0 – 20 mA outputs. Suitable for use with uid
temperatures up to 200° F.
Platinum RTD Temperature Sensors (32° – 250° F)
Pair of 4-wire 1000 Ω Platinum RTD temperature sensors. Suitable for use with uid temperatures
up to 250° F.
Please refer to ONICON’s System-20 product literature, or contact ONICON for help in selecting the
temperature sensors and thermowells that will best t your requirements.
1.5 WORKING ENVIRONMENT
The System-20 was designed for installation and use in typical domestic and commercial
environments that are free of corrosive liquids and fumes, direct liquid exposure, temperature
extremes and vibrations.
The System-20 may be installed outdoors in protected spaces away from direct sunlight, rain,
sleet or snow.
The operating ambient air temperature range is -13° F to 140° F. The electrical power should be
relatively clean, free of high frequency noise, large voltage transients, and protected from power
surges and brown outs.
Flow Meter Model Line Sizes Straight Run
Required Notes
F-1100 Single Turbine Insertion Flow
Meter 1 ¼" and larger 25 Can be used in 1" copper lines
F-1200 Dual Turbin Insertion Flow Meter 2 ½" and larger 15
F-1300 Inline Turbine Flow Meter ¾" and 1" 25
F-3500 Insertion Electromagnetic Flow
Meter 1 ¼" and larger See manual
F-2600 Series Vortex Flow Meter 1" - 12" See manual For use in higher
temperature applications
F-3000 Series Inline Electromagnetic Flow
Meters ¼" and larger 5
F-4300 Clamp-on Ultrasonic Flow Meter 2" and larger See manual
F-4600 Inline Ultrasonic Flow Meter ½" - 2 ½" See manual

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1.6 WARRANTY & SERIAL NUMBER
Warranty
ONICON provides a 2-year warranty for this product. Certain exclusions apply. Please refer to
ONICON’s Conditions of Sale for details.
Serial Number
The serial number of your System-20 is located on the top and inside the enclosure. The serial
number is a unique identier for the product. Please have this number available when contacting
ONICON for assistance.
SECTION 2.0: UNPACKING
The System-20 is generally shipped in one package unless optional hardware or equipment is
ordered. (Thermowells may have been shipped in advance.)
2.1 CHECKING THAT YOU HAVE RECEIVED EVERYTHING
Please notify ONICON immediately if any of these items are missing.
• Standard Documentation Includes:
The System-20 BTU Meter Installation and Operation Guide
The System-20 Certicate of Calibration
• The System-20
Remove the System-20 from the shipping carton and inspect it for physical damage. Notify
the freight carrier and ONICON immediately if any items are damaged in transit. Save all
packaging.
Btu meters ordered with a ow meter and temperature sensors will be delivered congured
and programmed for use together as a system. The System-20 and the temperature sensor
serial numbers will match. The ow meter serial number will be shown on the certicate of
calibration and on the System-20 display.
• Temperature Sensors
If ordered, temperature sensors will generally be packed in the same carton with the
System-20. Inspect the sensors and cables for damage. Each sensor will have a label attached
with a serial number.
• Flow Meter
If ordered, the ow meter will be packaged in a separate carton. The ow meter ordered
with this Btu meter came complete with an instruction manual. Please refer to it for detailed
information regarding its installation, commissioning, and operation.
• Flow Meter & Temperature Sensor Installation Hardware
Installation hardware is ordered separately from the System-20, temperature sensors and ow
meter. Note that this hardware is frequently shipped in advance of the meter(s).

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 8
SECTION 3.0: INSTALLATION
The System-20 BTU Meter should be installed by personnel with related knowledge and
experience in the heating, cooling, and uid metering elds. ONICON is available to assist with
technical recommendations and to provide guidance by telephone and/or e-mail during the
installation and commissioning process. On-site eld 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 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 ux, solder, pipe and tube cuttings and any other debris.
3.1 SITE SELECTION
Careful attention to the site selection for the system components will help ensure an accurate
energy measurement, help the installers with the initial installation, reduce start-up problems,
and make future maintenance easier. For example, do not install the ow meter where it will be
difcult for personnel to perform periodic maintenance. When selecting a site for mounting the
components, refer to 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 ow sensor and
the temperature sensors must be properly located within the piping system in order to ensure an
accurate energy measurement.
• The System-20
Find an easily accessible location where eld wiring connections can be made and meter
readings can be taken from oor level. Mount the 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 ow meter will only measure ow associated with that portion
of the piping system for which the energy measurement is being made. The ow 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 ow meter installation manual for specic
information regarding the straight run requirements for the ow meter.
• The Temperature Sensors
The two temperature sensors must be located so they 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, nd an easily accessible location where eld wiring connections can be made from
oor level. This will facilitate 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 ow
meter. It must be located at least ve pipe diameters downstream of the ow meter leaving
enough clearance to remove either sensor from the pipe without interference from the other
sensor.

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 9
IMPORTANT NOTE
The components of the ONICON System-20 BTU Measurement System must be congured,
programmed and installed together as a system. Mixing components from different systems may
result in signicant measurement errors.
i
• Find an easily accessible location where electrical connections can be made and meter
readings can be taken from the oor level.
• Mount the Btu meter on a vibration-free surface. Avoid sites such as the plenum of a fan coil,
heat exchanger, or other housings containing motors.
• The meter must be installed in protected spaces away from direct sunlight, rain, sleet or snow.
7 5/8"
5 1/2"
5"
∅0.875" 5pl
∅0.200" 4pl
SYSTEM-20
BTU METER
!
CAUTION
DO NOT drill holes in the enclosure. Use only the openings that are provided.
3.2 MECHANICAL INSTALLATION

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 10
3.2.1 Mounting the Enclosure
Use four screws for mounting the Btu meter. The mounting surface must be structurally
sound and capable of withstanding a minimum weight of 40 lbs (18 kg).
Use the following screws for mounting.
• Four Machine screws - #10-24 X 1.5”
• Four Wood screws - No. 10 X 1.5”
• Four Concrete screws - 3/16” X 1.5” with ¼" maximum hex, Phillips or slot heads
Four mounting holes have been provided in the base of the enclosure shown below. Push
out the rubber seals by inserting the mounting screws. Use the drilling template provided
in Appendix 5 of this manual to drill the 4 holes required to mount the enclosure.
Mounting
Holes
A DIN rail mounting hardware kit has been
provided with this meter. Mount the DIN
rail clips as shown below.
!
CAUTION
DO NOT USE THE ENCLOSURE AS A TEMPLATE FOR DRILLING HOLES. Do not drill holes in
the enclosure. Use only the openings that are provided.

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 11
3.2.2 Thermowell Installation
IMPORTANT NOTE
It is important that no dirt or other foreign material be allowed into the thermowells as this could
affect the thermal response of the system.
i
3.2.2.1 Standard Thermowells
Standard thermowells are for new construction or scheduled shutdown. The
most common installation methods are shown below. Refer to Appendix A-6 for
thermal insulator installations. Consult ONICON for special applications.
NOTES: 1. Thermowell length varies with pipe size.
2. Use no additional bushings to ensure that tip of thermowell is inserted into ow stream.
3.2.2.2 Hot Tap Thermowells
Hot tap thermowells are designed for retrot applications where it is not practical to
isolate and drain the pipe section prior to installation. The thermowell is installed
through a 1” full port ball valve as shown in the drawing on next page. A wet
tap drilling machine equipped with a 7/8” drill is required to perform this type of
installation.
Install the valve assembly as shown in the drawing on the next page and then
drill the 7/8” hole using the wet tap drilling machine. Once the valve assembly has
been installed and the hole has been drilled, the thermowell can be inserted into
the ow stream without a system shutdown.
!
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. Be sure to hold the conduit box rmly by hand before
slowly loosening the position clamping nut when installing, adjusting or removing the thermowell.
Failure to do this will allow the pressure to suddenly and rapidly force the thermowell from the
pipe, potentially causing serious injury. The thermowell could also be damaged or break apart
causing a break in the water seal resulting in the loss of large amounts of water.

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 12
INSERTION OF THE HOT TAP THERMOWELL
1. Calculate the insertion force (lbs) required by multiplying the system pressure
(psig) by 0.11. The person inserting the thermowell should ensure adequate
footing for the force required prior to opening the valve.
2. After applying thread seal tape, thread the hot tap adapter into the valve.
Firmly grasp the wiring enclosure, loosen the position clamping nut, open the
valve, and carefully push the thermowell into the ow stream. Use the at-
tached gauge to set the insertion depth.
!
!
CAUTION
Excessive vibration can damage the thermowell. Insert the thermowell to the proper depth using
gauge supplied as shown. Reduce the insertion depth as necessary if strong vibrations are felt
during insertion, making certain that the tip of the thermowell remains fully in the ow stream.
3. Carefully tighten the position clamping nut that is located at the top of the
1" NPT hot tap adapter tting. Do not release the wiring enclosure until the
position clamping nut has been tightened.
CAUTION
DO NOT OVER TIGHTEN THE POSITION CLAMPING NUT. If uid leaks, do not attempt to
correct by tightening this nut further. An internal o-ring seals the uid. Contact ONICON for
assistance in the event of a leak.

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 13
REMOVAL OF THE HOT TAP THERMOWELL
i
1. System pressure will try to push the thermowell out of the ow stream when the
clamping nut is released. Be sure to establish safe footing prior to loosening the
clamping nut. The force pushing out against the thermowell is the same as the
insertion force.
2. Grasp the wiring enclosure rmly, holding the thermowell in the pipe and then
loosen the position clamping nut. Slowly withdraw the thermowell from the pipe.
3. After the thermowell is completely withdrawn, carefully close the isolation valve.
!
WARNING
Maintain a rm hold on the wiring enclosure until the thermowell is completely withdrawn and
the valve is closed.
IMPORTANT NOTE
Rotating the thermowell as you slowly withdraw it through the valve will ensure that the lower
tip is fully withdrawn and completely free of the valve. If resistance is felt when closing the
valve, open valve fully and rotate the well as you pull it further out of the pipe.
3.2.3 Temperature Sensor Installation
When ordered with the System-20, temperature sensors are factory matched and tagged
by serial number to a specic Btu meter. ONICON standard temperature sensors are also
designated and labeled as the SUPPLY or RETURN sensor and must be installed per these
labels.
3.2.3.1 ONICON Standard Temperature Sensor Installation
ONICON standard temperature sensors must be used as a pair to maintain
differential accuracy. They are also designated and labeled as the SUPPLY or
RETURN sensor and must be installed accordingly. To install, apply a thin coat
of thermal compound to the sensor tip area and insert it all the way into the
thermowell until it contacts the bottom of the cavity. Gently tighten the retainer
nut. DO NOT OVER TIGHTEN. The thermowell completely seals the plumbing
system without the retainer nut. The only purpose for the nut is to ensure that the
sensor tip will remain in contact with the bottom of the thermowell.

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 14
0284 9-5-01
STANDARD THERMOWELL ASSEMBLY
FOR SYSTEM-10 BTU METER
SHOWN WITH TEMPERATURE SENSOR
PLACE ELECTRONICS
MODULE IN BOX AFTER
CONNECTING WIRES.
1/2” HOLE FOR
CONDUIT OR
STRAIN RELIEF
FITTING
PROVIDE #18-22 TWISTED
SHIELDED PAIR. COIL ONE
FOOT OF EXTRA CABLE IN
CONDUIT BOX.
SUPPLY
SIGNAL (RED)
REFERNECE (BLACK)
S/N 123456
RETAINING NUT
(Do NOT Overtighten)
TEMPERATURE
SENSOR
PLASTIC
END PIECE
SPACER SLEEVE
(Length varies with
thermowell length)
ELECTRONICS
MODULE
SUPPLY
S/N 123456
SIGNAL (RED)
REFERENCE (BLACK)
!
CAUTION
DO NOT OVERTIGHTEN. The thermowell completely seals the plumbing system. Screwing in the
sensor just ensures that the sensor tip will remain in contact with the bottom of the thermowell.
TEMPERATURE SENSOR INSTALLED IN THERMOWELL
TEMPERATURE SENSOR

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System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 15
Cover Screws
RS485 (20 – 24 AWG wire)
Name TB1 Description
RS485 B (+) TB1-1
RS485 Unit Load = ¼
Recommended maximum
device per segment = 32
RS485 A (-) TB1-2
RS485 Common TB1-3
Shield TB1-4
RS485 Termination Resistor
Name JMP1 Description
120 Ohm JMP1-1 Jumper position 1 & 2 = 120
Ohm Termination
120 Ohm JMP1-2
None JMP1-3 Jumper positions 2 & 3 = No
termination
Pulse Inputs
Name TB2 Description
IN 1 (+) TB2-1
For use with open collector sinking
and dry contact outputs only
Input rating
Pulse duration: 50 ms minimum
Sinking current: 1 mA maximum
IN 1 (-) TB2-2
IN 2 (+) TB2-3
IN 2 (-) TB2-4
IN 3 (+) TB2-5
IN 3 (-) TB2-6
Pulse Outputs
Name TB3 Description
OUT 1 (+) TB3-1 Opto coupled solid state relay output.
100 V maximum input voltage
30 Ω maximum ON resistance
80 mA maximum current
0.5 Hz maximum pulse rate
Pulse duration: Selectable 50, 100,
500 or 1000 ms
OUT 1 (-) TB3-2
OUT 2 (+) TB3-3
OUT 2 (-) TB3-4
OUT 3 (+) TB3-5
OUT 3 (-) TB3-6
Analog Output
Name TB4 Description
4-20 mA Out TB4-1 4-20 mA maximum load
resistance 750 Ohms
Voltage output selectable as
0-10 V or 0-5 V
4-20 mA Common TB4-2
0-10 V Out TB4-3
0-10 V Common TB4-4
Temperature (ONICON Standard Sensors)
Name TB5 Description
SUPTEMP (+) TB5-1
Each sensor is individually
labeled as supply (SUP)
and return (RET) and
must be connected to the
appropriate terminals.
SUPTEMP (-) TB5-2
SHIELD TB5-3
RETTEMP (+) TB5-4
RETTEMP (-) TB5-5
RTD Supply & RTD Return
Name TB6 & TB7 Description
(A) TB6-1 / TB7-1 RTD signal lead (A)
(A) TB6-2 / TB7-2 Compensation lead (A) not
used with 2-wire RTDs
(B) TB6-3 / TB7-3 RTD signal lead (B)
(B) TB6-4 / TB7-4 Compensation lead (B) not
used with 2-wire RTDs
2-wire / 4-wire RTS Selection Jumpers (4 places)
Name 2-4 Wire Description
2 JMP1-1 Select jumper positions 1
& 2 for 2-wire RTD
JMP1-2
4 JMP1-3 Select jumper positions 2
& 3 for 4-wire RTD
Turbine Flow Meter Input
Name TB8 Description
24 V TURB TB8-1 Isolated 24 VDC Supply, 100
mA maximum current
TURB FREQ TB8-2 5-24 VDC, 500 Hz maximum
frequency
TURB COMMON TB8-3 Isolated Common
AC/DC POWER INPUT
Name Term # Description
24 V L (+) 1
20 – 28 V AC/DC, 50-60 Hz
500 mA DC input current
1A AC input current
Instrument earth
24 V N (-) 2
EARTH 3
24 V L (+) 4
24 V N (-) 5
EARTH 6
Flow Meter Input
Name TB9 Description
24 VDC (+) TB9-1 24 VDC, 250 mA maximum
current
4-20 mA IN TB9-2 Loop power = TB9-1 & TB9-2 /
Active output = TB9-2 & TB9-4
FREQ IN TB9-3 5-24 VDC, 500 Hz maximum
frequency
Signal Common TB9-4 Signal common only
24 VDC (-) TB9-5 24 VDC common
System-20-BAC Enclosure Label
2065 05-17
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1 2 3 4 5 1 2 3 4 1 2 3 4 1 2 3 1 2 3 4 5
1 2 3 4 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4
1 2 3 4 5 6
TB1 RS-485 TB2 PULSE IN TB3 PULSE OUT TB4 ANA OUT
TB5 TEMPERATURE TB6 RTD SUP TB7 RTD RET TB8 TURB TB9 FLOWMETER
AC/DC POWER IN AUX POWER OUT
2 4
WIRE
2 4
WIRE
2 4
WIRE
2 4
WIRE
TERMINATED UNTERMINATED
JMP1 RS485 LOAD
ONICON, INC
P/N 20087 - REV-B
10/31/16
EARTH 24 V N (-) 24V L (+) EARTH 24 V N (-) 24V L (+)
!
24V ONLY
JP3 J2
0-10 VCOM 0-10VOUT 4-20 mACOM 4-20mAOUT OUT 3 (-) OUT 3 (+) OUT2 (-) OUT 2 (+) OUT 1 (-) OUT1 (+) IN 3 (-) IN 3 (+) IN 2 (-) IN 2 (+) IN 1 (-) IN 1 (+) SHEILD RS485COM RS485 - RS485+
24VDC (-) SIG COMM FREQIN 4-20mA IN 24 VDC (=) TURBCOM TURB FREQ 24V TURB (B) (B) (A) (A) (B) (B) (A) (A) RETTEMP (-) RETTEMP (+) SHIELD SUPTEMP (-) SUPTEMP (+)
3.3 POWER AND SIGNAL WIRING CONNECTIONS
The System-20 is provided with three ¾" conduit openings along the bottom of the enclosure
for power and signal cables. Two openings are provided with knockout seals. The power cable
should enter the enclosure through the right hand opening. Do not remove the seals from
unused openings. To access the wiring connections, remove the two cover screws shown below.

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone] • [email protected]
System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 16
SECTION 4.0: SYSTEM-20 START-UP AND COMMISSIONING
4.1 START-UP
When power is rst applied to the meter the display will be illuminated and the following start
screen will appear. Momentarily press SEL (select) to access the operating mode (User Screens)
display pages.
User Screens
NEXT
SEL
!
Commissioning
Verify that the meter is functional by stepping through the display pages and conrming the ow
rate and temperature data is within expected norms. Momentarily press NEXT or BACK to change
the displayed page. A complete list of the display pages is provided on the following pages.
NEXT
MENU
0
kBtu
!
Energy Total
BACK
Alarm Indication
Unit of Measure
When reviewing the displayed data, note the factory programmed engineering units on each
display page (e.g. kBtu, gallons, kBtu/h, gpm, °F, etc.). Note any changes that may be necessary.
These will need to be made during commissioning.
When reviewing the Supply and Return temperature display pages, note which one has the word
“FLOW” in the lower left corner of the page. This is an indication of the ow sensor location in
the piping system. Verify the actual location of the ow sensor in the piping system. It is critical
that the correct location (supply or return) be programmed into the meter.
!
CAUTION
During start-up and commissioning, the FLOW location must be properly identied as being
in the supply or return pipe of the heat exchange circuit. The sensor’s position must then be
programmed into the meter. Failure to do so will result in signicant errors in both the ow
and energy measurements.
To return to the commissioning mode from the user screens, momentarily press MENU.
The following page will appear. Momentarily press EXIT to return to the start screen.
NEXT
SEL
More Totals
Meter Data
! Alarm
Diagnostic
EXIT
BACK

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone] • [email protected]
System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 17
4.1.1 Single and Dual Mode Display Pages
Single Mode Dual Mode
NEXT
MENU
0
kBtu
!
Energy Total
BACK
NEXT
MENU
0
gallons x 1
!
Volume Total
BACK
NEXT
MENU
0
kBtu/h x 1
!
Energy Rate
BACK
NEXT
MENU
0
gpm x 1
!
Volume Rate
BACK
NEXT
MENU
0.0
Deg F
!
Supply
Temperature
BACK
NEXT
MENU
0.0
Deg F
!
Return
Temperature
BACK
NEXT
MENU
0.0
Deg F
!
Delta Temperature
BACK
NEXT
MENU
0
Counts
!
Auxiliary Input 1
BACK
NEXT
MENU
0
Counts
!
Auxiliary Input 2
BACK
NEXT
MENU
0
Counts
!
Auxiliary Input 3
BACK
NEXT
MENU
0
hours
!
Run hours
BACK
Mode 1
NEXT
MENU
0
kBtu
!
Energy Total
BACK
Mode 2
Mode 1
NEXT
MENU
0
gallons x 1
!
Volume Total
BACK
Mode 2
NEXT
MENU
Mode 2
!
Mode Status
BACK
NEXT
MENU
0
gallons x 1
!
Volume Total
BACK
NEXT
MENU
0
kBtu/h x 1
!
Energy Rate
BACK
NEXT
MENU
0
gpm x 1
!
Volume Rate
BACK
NEXT
MENU
0.0
Deg F
!
Supply
Temperature
BACK
NEXT
MENU
0.0
Deg F
!
Return
Temperature
BACK
NEXT
MENU
0.0
Deg F
!
Delta Temperature
BACK
NEXT
MENU
0
Counts
!
Auxiliary Input 1
BACK
NEXT
MENU
0
Counts
!
Auxiliary Input 2
BACK
NEXT
MENU
0
Counts
!
Auxiliary Input 3
BACK
NEXT
MENU
0
hours
!
Run hours
BACK
NEXT
MENU
0
kBtu
!
Energy Total
BACK
*
*
*
*
*
*
* Auxiliary input pages only appear when enabled.

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone] • [email protected]
System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 18
4.1.2 Additional Display Pages
YTD Energy & Volume Totals reset at
12:01 AM on January 1st
Prev. Yr. Energy & Volume Totals update at
12:01 AM on January 1st
User Energy Totals reset via MODBUS
NEXT
MENU
Low Flow
Alarm
NEXT
MENU
0
Reset Count
NEXT
MENU
0
Max 200
Flow Count
BACK
EXIT
BACK
EXIT
BACK
EXIT
Diagnostics
NEXT
MENU
Flow Meter
Serial Number
NEXT
MENU
NEXT
MENU
HH:MM:SS
Current Time
NEXT
MENU
App:
Boot:
Versions
NEXT
MENU
0
Serial Number
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
Meter Data
NEXT
MENU
YYYY/MM/DD
Manuafacture Date
NEXT
MENU
Current Date
BACK
EXIT
BACK
EXIT
YYYY/MM/DD
Alarms
Alarm Mesages
Flow Temp Open
Low Flow
Low Supply Temp
Low Return Temp
dt< Minimum
Temperature Sensor
Serial Number
NEXT
MENU
0
kBtu
YTD Energy
NEXT
MENU
0
gallons
YTD Volume
NEXT
MENU
0
kBtu
Prev. Yr Energy
NEXT
MENU
0
gallons
Prev. Yr Volume
NEXT
MENU
0
kBtu
User Energy Total
NEXT
MENU
0
kBtu
Mode 1
NEXT
MENU
0
kBtu
YTD Energy
Mode 2
Mode 1
NEXT
MENU
0
gallons
YTD Volume
Mode 2
NEXT
MENU
0
gallons
YTD Volume
NEXT
MENU
0
kBtu
Prev. Yr Energy
NEXT
MENU
0
gallons
Prev. Yr Volume
NEXT
MENU
0
KBtu
User Energy Total
NEXT
MENU
0
kBtu
YTD Energy
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
BACK
EXIT
NEXT
MENU
0
gallons
Prev. Yr Volume
NEXT
MENU
0
kBtu
Prev. Yr Energy
Mode 1
BACK
EXIT
BACK
EXIT
Mode 2
Mode 1
Mode 2
User Energy Total
Mode 1
Mode 2
Single Mode
More Totals
Dual Mode
More Totals
Diagnostics
Meter Data Alarms

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone] • [email protected]
System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 19
NEXT
Meter Factor
XX.XXX
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Full Scale
Maximum Flow
XXXX
NEXT
BACK
EDIT
EDIT
0 - 9999999
EXIT
Flow Damping
1
1 - 32
NEXT
BACK
EDIT
Pulses per units
% of maximum flow
EXIT
Flow Input Source
Frequency
NEXT
BACK
EDIT
EXIT
Flow Input Source
4-20Ma
NEXT
BACK
EDIT
EXIT
Energy Units
kBtu x 1
Select Units
NEXT
BACK
EDIT
EXIT
Energy Multiplier
EXIT
Energy Rate
kBtu/h x 1
Select Units
NEXT
BACK
EDIT
NEXT
BACK
EDIT
NEXT
Energy Rate Multiplier
kBtu/h x 1
EXIT
BACK
EXIT
Energy Damping
1
NEXT
BACK
EDIT
EDIT
1 - 32
kBtu x 1
X.X
Supply Temperature
20mA
Return Temperature
4mA
Return Temperature
20mA
EXIT
Temperature Sensor
Type
1k Ohm RTD
NEXT
BACK
EDIT
Auxiliary Input
Label 1
Configure Auxiliary
Input 2
Auxiliary Input
Label 2
Configure Auxiliary
Input 3
Auxiliary Input
Label 3
Units of Measure Settings Continued
NEXT
Mode
Single
EXIT
BACK
NEXT
BACK
EDIT
Single/Dual/BiDirectional
EDIT
EXIT
Flow Multiplier
NEXT
Volume Multiplier
gal x 1
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Flow Units
gpm x 1
NEXT
BACK
EDIT
EDIT
Select Units
gpm x 1
NEXT
Medium
Water
EXIT
BACK
EDIT
EXIT
Flow Rate Units
gpm x 1
Select Units
NEXT
BACK
EDIT
NEXT
Flow 20mA
XXXX
EXIT
BACK
EXIT
Low Flow Cutoff
X.X
NEXT
BACK
EDIT
EDIT
% of maximum flow
EXIT
Flow Damping
1
1 - 32
NEXT
BACK
EDIT
0 - 9999999
EXIT
Meter Volume Units
gallons
Select Units
NEXT
BACK
EDIT
EXIT
Low Flow Cutoff
NEXT
X
EXIT
BACK
EXIT
XXX
NEXT
BACK
EDIT
EDIT
EXIT
Supply Temperature
4mA
X
NEXT
BACK
EDIT
EXIT
Temperature Sensor
Type
Scalable
NEXT
BACK
EDIT
EXIT
Volume Units
gallons
Select Units
BACK
EDIT
Modbus
NEXT
BACK
EDIT
EXIT
Protocol
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
Max Master
2
NEXT
BACK
EDIT
2 - 127
Baud Rate
19200
NEXT
BACK
EDIT
Odd Even None
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
Set Time
HH:MM:SS
NEXT
BACK
EDIT
1 2
NEXT
BACK
EDIT
EXIT
Set Meter
NEXT edits units of
measure
SAVE completes install
with current settings
EXIT
Meter Location
Return
NEXT
BACK
EDIT
EXIT
Set Date
YYYY:MM:DD
NEXT
Set Meter
Next to complete Install
or adjust
settings.
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Protocol
BACnet
NEXT
BACK
EDIT
EXIT
Modbus Address
EXIT
EXIT
Parity
1
0 - 247
None
EXIT
Stop Bits
1
NEXT
EXIT
Flow Meter
Serial Number
XXXXXX
NEXT
BACK
EDIT
EXIT
Location Tag
Text
NEXT
BACK
EDIT
NEXT
BACK
None
NEXT
BACK
EDIT
EXIT
Protocol
SAVE
EXIT
XXX
NEXT
BACK
EDIT
Pulse Output 3
Alarm
Select Type
S
elect Multiplier
EXIT
NEXT
BACK
EDIT
EXIT
NEXT
Analog Volts Signal
0 - 10V
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Analog Output Max
2000
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EDIT
Analog Output
Energy Rate
Analog Output Min
0
Set Meter
Press NEXT edit units
of measure
SAVE completes install
with current settings
S elect Type
S elect Signal
Energy Rate - kBtu/h
Energy Rate - kBtu/h
EXIT
BACnet Address
EXIT
Instance Number
EXIT
Baud Rate
1
0 - 127
57017
0 - 4194302
38400
Short Commissioning
NEXT
BACK
EDIT
NEXT
BACK
EDIT
Pulse
EXIT
EXIT
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
NEXT
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Pulse Duration
500 ms
NEXT
BACK
EDIT
EDIT
Counts
Pulse Output 1
Energy Total
Volume Pulse Scaling
x 1
Select Type
Pulse Output 2
Volume Total
Select Type
EXIT
EXIT
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
EXIT
NEXT
Configure Auxiliary
Input 1
Pulse
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Counts
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EDIT
Supply Temperature
Slope
10.000
Return Temperature
Offset
+0.000
Return Temperature
Slope
10.000
Pulse
Counts
EXIT
EXIT
EXIT
Temperature
EXIT
Temperature Sensor
Serial Number
XXXXXX
NEXT
BACK
EDIT
NEXT
BACK
EDIT
Deg F
Select Units
EXIT
Supply Temperature
Offset
EXIT
NEXT
BACK
EDIT
EXIT
Temperature Sensor
Type
ONICON
NEXT
BACK
EDIT
NEXT
BACK
EDIT
+0.000
Units of Measure Settings
Commissioning Checklist
Part 1 Mechanical Installation
Conrm that the system components are
installed in the correct locations (Sec. 1.5 & 3.1).
Conrm that the ow sensor is properly installed
and correctly oriented with respect to ow
direction (ow meter manual).
Part 2 Programming
Conrm that the ow sensor location in the
piping system (supply or return) is programmed
into the meter (Sec. 4.1 & 4.2.1).
Verify that the Units of Measure Settings in the
meter are correct (Sec. 4.1 & 4.2.1).
Conrm that there are no alarm indications and
the meter is functional (Sec. 4.1.2 & 5.0).
4.2 COMMISSIONING
The last step in the installation process is commissioning the meter. Commissioning is a two-step
process. The rst step is to review the mechanical installation to conrm that the ow sensor and
temperature sensor(s) are properly located in the piping system. The second step is a review of
the meter program settings. Both steps must be completed in order to nish the installation. A
simple commissioning checklist is shown below. A copy of this may be found online at
www.onicon.com/system20.html.
Initial Power-up
Short Commissioning
4.2.1 Commissioning Following Initial Power-up
During initial power-up, the display pages will appear when the
commissioning option is selected. The settings shown below allow
the installer to set MODBUS®or BACnet®parameters, the ow
sensor location (supply or return pipe) and the date and time. If
the factory pre-programmed engineering units for ow, energy and
temperature are correct, press SAVE to exit commissioning once
the correct date has been set. Momentarily press NEXT if you wish
access the remaining commissioning mode display pages shown
on the following pages.

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone] • [email protected]
System-20-BTU Meter Installation and Operation Guide 03/18 - 2051-1 / 36985 Page 20
Continued From Previous Page
NEXT
Meter Factor
XX.XXX
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Full Scale
Maximum Flow
XXXX
NEXT
BACK
EDIT
EDIT
0 - 9999999
EXIT
Flow Damping
1
1 - 32
NEXT
BACK
EDIT
Pulses per units
% of maximum flow
EXIT
Flow Input Source
Frequency
NEXT
BACK
EDIT
EXIT
Flow Input Source
4-20Ma
NEXT
BACK
EDIT
EXIT
Energy Units
kBtu x 1
Select Units
NEXT
BACK
EDIT
EXIT
Energy Multiplier
EXIT
Energy Rate
kBtu/h x 1
Select Units
NEXT
BACK
EDIT
NEXT
BACK
EDIT
NEXT
Energy Rate Multiplier
kBtu/h x 1
EXIT
BACK
EXIT
Energy Damping
1
NEXT
BACK
EDIT
EDIT
1 - 32
kBtu x 1
X.X
Supply Temperature
20mA
Return Temperature
4mA
Return Temperature
20mA
EXIT
Temperature Sensor
Type
1k Ohm RTD
NEXT
BACK
EDIT
Auxiliary Input
Label 1
Configure Auxiliary
Input 2
Auxiliary Input
Label 2
Configure Auxiliary
Input 3
Auxiliary Input
Label 3
Units of Measure Settings Continued
NEXT
Mode
Single
EXIT
BACK
NEXT
BACK
EDIT
Single/Dual/BiDirectional
EDIT
EXIT
Flow Multiplier
NEXT
Volume Multiplier
gal x 1
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Flow Units
gpm x 1
NEXT
BACK
EDIT
EDIT
Select Units
gpm x 1
NEXT
Medium
Water
EXIT
BACK
EDIT
EXIT
Flow Rate Units
gpm x 1
Select Units
NEXT
BACK
EDIT
NEXT
Flow 20mA
XXXX
EXIT
BACK
EXIT
Low Flow Cutoff
X.X
NEXT
BACK
EDIT
EDIT
% of maximum flow
EXIT
Flow Damping
1
1 - 32
NEXT
BACK
EDIT
0 - 9999999
EXIT
Meter Volume Units
gallons
Select Units
NEXT
BACK
EDIT
EXIT
Low Flow Cutoff
NEXT
X
EXIT
BACK
EXIT
XXX
NEXT
BACK
EDIT
EDIT
EXIT
Supply Temperature
4mA
X
NEXT
BACK
EDIT
EXIT
Temperature Sensor
Type
Scalable
NEXT
BACK
EDIT
EXIT
Volume Units
gallons
Select Units
BACK
EDIT
Modbus
NEXT
BACK
EDIT
EXIT
Protocol
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
Max Master
2
NEXT
BACK
EDIT
2 - 127
Baud Rate
19200
NEXT
BACK
EDIT
Odd Even None
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
Set Time
HH:MM:SS
NEXT
BACK
EDIT
1 2
NEXT
BACK
EDIT
EXIT
Set Meter
NEXT edits units of
measure
SAVE completes install
with current settings
EXIT
Meter Location
Return
NEXT
BACK
EDIT
EXIT
Set Date
YYYY:MM:DD
NEXT
Set Meter
Next to complete Install
or adjust settings.
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Protocol
BACnet
NEXT
BACK
EDIT
EXIT
Modbus Address
EXIT
EXIT
Parity
1
0 - 247
None
EXIT
Stop Bits
1
NEXT
EXIT
Flow Meter
Serial Number
XXXXXX
NEXT
BACK
EDIT
EXIT
Location Tag
Text
NEXT
BACK
EDIT
NEXT
BACK
None
NEXT
BACK
EDIT
EXIT
Protocol
SAVE
EXIT
XXX
NEXT
BACK
EDIT
Pulse Output 3
Alarm
Select Type
Select Multiplier
EXIT
NEXT
BACK
EDIT
EXIT
NEXT
Analog Volts Signal
0 - 10V
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Analog Output Max
2000
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EDIT
Analog Output
Energy Rate
Analog Output Min
0
Set Meter
Press NEXT edit units
of measure
SAVE completes install
with current settings
Select Type
Select Signal
Energy Rate - kBtu/h
Energy Rate - kBtu/h
EXIT
BACnet Address
EXIT
Instance Number
EXIT
Baud Rate
1
0 - 127
57017
0 - 4194302
38400
Short Commissioning
NEXT
BACK
EDIT
NEXT
BACK
EDIT
Pulse
EXIT
EXIT
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
NEXT
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Pulse Duration
500 ms
NEXT
BACK
EDIT
EDIT
Counts
Pulse Output 1
Energy Total
Volume Pulse Scaling
x 1
Select Type
Pulse Output 2
Volume Total
Select Type
EXIT
EXIT
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EXIT
EXIT
NEXT
Configure Auxiliary
Input 1
Pulse
EXIT
BACK
NEXT
BACK
EDIT
EXIT
Counts
NEXT
BACK
EDIT
NEXT
BACK
EDIT
EDIT
Supply Temperature
Slope
10.000
Return Temperature
Offset
+0.000
Return Temperature
Slope
10.000
Pulse
Counts
EXIT
EXIT
EXIT
Temperature
EXIT
Temperature Sensor
Serial Number
XXXXXX
NEXT
BACK
EDIT
NEXT
BACK
EDIT
Deg F
Select Units
EXIT
Supply Temperature
Offset
EXIT
NEXT
BACK
EDIT
EXIT
Temperature Sensor
Type
ONICON
NEXT
BACK
EDIT
NEXT
BACK
EDIT
+0.000
Units of Measure Settings