Endress+Hauser SS500XP User manual

Products Solutions Services
BA02183C/66/EN/01.21
For use with version
HC12
(Device Firmware)
Operating Instruction
SS500XP/SS2000XP TDLAS Gas Analyzer
CSA Class I, Division 1 Groups B, C and D; T4

Copyright © 2021 Endress+Hauser. No part of this manual may be reproduced in whole or in part without the express
written permission of Endress+Hauser. Endress+Hauser reserves the right to change product design and specifications at any
time without prior notice.

Endress+Hauser i
TABLE OF CONTENTS
1: Introduction
Who Should Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
General Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Safety warning label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Equipment labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Instructional symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Conventions used in this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
About the Gas Analyzers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Differences between the SS500XP and SS2000XP . . . . . . . . . . . . . . . . . . . . 1-4
How the Analyzers Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Wavelength Modulation Spectroscopy (WMS) signal detection . . . . . . . . . . . . 1-7
Getting Familiar with the Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Fuse specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
2: Safety
Potential Risks Affecting Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Mitigating risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Explosion hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
3: Installation
What Should be Included in the Shipping Box . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Inspecting the Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Installing the Analyzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Hardware and tools for installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Lifting/carrying the analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Mounting the analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Connecting Electrical Power to the Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Connecting the Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Changing the 4–20 mA Current Loop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Connecting the Gas Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Application of Conduit Lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Appendix A: Specifications
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Appendix B: Maintenance and Troubleshooting
Gas Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Excessive Sampling Gas Temperatures and Pressures . . . . . . . . . . . . . . . . . . . . B-2
Electrical Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Cleaning the Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Tools and supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Determining the type of cell mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Replacing the stainless steel mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Pressure Sensor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Peak Tracking Reset Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12
Instrument Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17

SS500XP/SS2000XP Gas Analyzer BA02183C
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Service repair order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17
Renewity returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-18
Before contacting Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-18
Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-18
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-19
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-19
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-20
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1

Endress+Hauser 1–1
1 - INTRODUCTION
Endress+Hauser’s SS500XP/SS2000XP products are high-speed, diode laser-
based extractive analyzers designed for extremely reliable monitoring of very
low to standard concentrations of specific components in various background
gases. In order to ensure that the analyzer performs as specified, it is
important to closely review the installation and operation sections of this
manual. This manual contains a comprehensive overview of the
SS500XP/SS2000XP analyzer and step-by-step instructions on:
•Inspecting the analyzer
•Installing the analyzer
•Maintaining and troubleshooting the system
Who Should Read This Manual
This manual should be read and referenced by anyone installing, operating or
having direct contact with the analyzer.
How to Use This Manual
Take a moment to familiarize yourself with this manual by reading the Table
of Contents.
There are a number of options and accessories available for the
SS500XP/SS2000XP analyzers. This manual has been written to address the
most common options and accessories. Images, tables and charts have been
included to provide a visual understanding of the analyzer and its functions.
Special symbols are also used to provide the user with key information
regarding the system configuration and/or operation. Pay close attention to this
information.
General Warnings and Cautions
Instructional icons are provided in this manual and on the SS500XP/SS2000XP
to alert the user of potential hazards, important information and valuable tips.
Following are the symbols and associated warning and caution types to observe
when servicing the analyzer. Some of these symbols are provided for
instructional purposes only and are not labeled on the system.
Safety warning label
The warning label shown below will be affixed to the front side of all analyzer
enclosures that contain sample gas.

SS500XP/SS2000XP Gas Analyzer BA02183C
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Hazards may vary by stream composition. One or more of the following
conditions may apply.
Equipment labels
The following special safety symbols and labeling are used on the equipment
to alert the user to potential hazards and important information associated with
the gas analyzer. Every symbol and label has significant meaning that should
be heeded.
Flammable. Gases used in the processing of this analyzer may
be extremely flammable. Any work in a hazardous area must be
carefully controlled to avoid creating any possible ignition sources
(e.g., heat, arching, sparking, etc.).
Toxins. Endress+Hauser analyzers measure a variety of gases,
including high-level H2S. Follow all safety protocols governing
toxic gases and potential leaks.
Inhalation. Inhaling toxic gases or fumes may cause physical
damage or death.
Technicians are expected to follow all safety protocols established
by the customer that are necessary for servicing or operating the
analyzer. This may include, but is not limited to, lockout/tag-out
procedures, toxic gas monitoring protocols, personal protective
equipment (PPE) requirements, hot work permits and other
precautions that address safety concerns related to performing
service or operation on process equipment located in hazardous
areas.
Failure to follow all directions may result in damage or
malfunction of the analyzer.

BA02183C SS500XP/SS2000XP Gas Analyzer
Endress+Hauser 1–3
Instructional symbols
Maximum voltage and current specifications for the fuse closest
to label.
Maximum sample cell operating warning. Failure to
follow all directions may result in damage or
malfunction of the analyzer.
General notes and important information concerning the
installation and operation of the analyzer.
Warning statement for hazardous voltage. Contact may cause
electric shock or burn. Turn off and lock out system before
servicing.
Failure to follow all directions or substitution of components may
result in explosion.
Failure to follow all directions may result in fire.
INVISIBLE LASER RADIATION - Avoid exposure to beam.
Class 3b Radiation Product. Refer servicing to the manufacturer-
qualified personnel.
Failure to follow all directions may result in damage or
malfunction of the analyzer.
Maximum voltage and current specifications for the fuse closest
to label.
WARNING
DO NOT EXCEED 10 PSIG
IN SAMPLE CELL

SS500XP/SS2000XP Gas Analyzer BA02183C
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Conventions used in this manual
In addition to the symbols and instructional information, this electronic manual
is created with “hot links” to enable the user to quickly navigate between
different sections within the manual. These links include table, figure and
section references and are identified by a pointing finger cursor when
rolling over the text. Simply click on the link to navigate to the associated
reference.
About the Gas Analyzers
The SS500XP/SS2000XP are tunable diode laser (TDL) absorption
spectrometers operating in the near- to short-wavelength infrared. Each
compact sensor consists of a TDL light source, sample cell and detector
specifically configured to enable high sensitivity measurement of a particular
component within the presence of other gas phase constituents in the stream.
The sensor is controlled by microprocessor-based electronics with embedded
software that incorporates advanced operational and data processing
algorithms.
A sample conditioning system may also be included with the system that has
been specifically designed to deliver an optimum sample stream that is
representative of the process systems stream at the time of sampling. Most
SS500XP/SS2000XP analyzer systems are configured for use at extractive
natural gas sampling stations.
Differences between the SS500XP and SS2000XP
The SS500XP and SS2000XP are single-channel analyzers used predominantly
for measuring H2O or CO2 in pipeline natural gas. The SS2000XP is a higher
resolution version of the SS500XP (for performance specifications, see
Table A–1 on page A–1 for the SS500XP or Table A–2 on page A–2 and
Table A–3 on page A–7 for the SS2000XP).
How the Analyzers Work
The SS500XP/SS2000XP analyzers employ tunable diode laser absorption
spectroscopy (TDLAS) to detect the presence of trace substances in process
gases. Absorption spectroscopy is a widely used technique for sensitive trace
species detection. Because the measurement is made in the volume of the gas,
the response is much faster, more accurate and significantly more reliable than
traditional surface-based sensors that are subject to surface contamination.
In its simplest form, a diode laser absorption spectrometer typically consists of
a sample cell with a mirror at one end, and a mirror or window at the opposite
end, through which the laser beam can pass. Refer to Figure 1–1. The laser
beam enters the cell and reflects off the mirror(s) making one or more trips
through the sample gas and eventually exiting the cell where the remaining
beam intensity is measured by a detector. With the SS500XP/SS2000XP

BA02183C SS500XP/SS2000XP Gas Analyzer
Endress+Hauser 1–5
analyzers, sample gas flows continuously through the sample cell ensuring that
the sample is always representative of the flow in the main pipe.
Due to their inherent structure, the molecules in the sample gas each have
characteristic natural frequencies (or resonances). When the output of the
laser is tuned to one of those natural frequencies, the molecules with that
particular resonance will absorb energy from the incident beam. That is, as the
beam of incident intensity, I0(), passes through the sample, attenuation occurs
via absorption by the trace gas with absorption cross section (). According
to the Beer-Lambert absorption law, the intensity remaining, I(), as measured
by the detector at the end of the beam path of length I (cell length x number
of passes), is given by
, (1)
where N represents the species concentration. Thus, the ratio of the absorption
measured when the laser is tuned on-resonance versus off-resonance is
directly proportional to the number of molecules of that particular species in
the beam path, or
. (2)
0.8 m Measurement Cell
Figure 1–1 Schematic of a typical laser
diode absorption spectrometer
FAR MIRROR
OUTLET
TEMPERATURE
SENSOR
PRESSURE
SENSOR
WINDOW
DETECTOR
OPTICAL HEAD
TEC
LASER
INLET
I  I0 exp   lN– =
N1–
  l
-------------- I 
I0 
-------------
ln=

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Figure 1–2 shows the typical raw data (in arbitrary units [a.u.]) from a laser
absorption spectrometer scan including the incident laser intensity, I0(), and
the transmitted intensity, I(), for a clean system and one with contaminated
mirrors (shown to illustrate the system’s relative insensitivity to mirror
contamination). The positive slope of raw data results from ramping the current
to tune the laser, which not only increases the wavelength with current, but
also causes the corresponding output power to increase. By normalizing the
signal by the incident intensity, any laser output fluctuations are canceled, and
a typical, yet more pronounced, absorption profile results. Refer to Figure 1–3.
3.0
2.5
2.0
1.5
1.0
0.5
Incident Energy I0()
Raw Signal, I()
Raw Signal, I()
(Contaminated Mirrors)
Wavelength [a.u.]
Signal [a.u.]
0.0
Figure 1–2 Typical raw signal from a laser diode
absorption spectrometer with and without mirror
contamination
1.0
0.99
0.98
0.97
0.96
0.95
Normalized Absorption Signal
Wavelength [a.u.]
Signal [a.u.]
Figure 1–3 Typical normalized absorption signal
from a laser diode absorption spectrometer

BA02183C SS500XP/SS2000XP Gas Analyzer
Endress+Hauser 1–7
Note that contamination of the mirrors results solely in lower overall signal.
However, by tuning the laser off-resonance as well as on-resonance and
normalizing the data, the technique self calibrates every scan resulting in
measurements that are unaffected by mirror contamination.
Wavelength Modulation Spectroscopy (WMS) signal detection
Endress+Hauser takes the fundamental absorption spectroscopy concept a
step further by using a sophisticated signal detection technique called
wavelength modulation spectroscopy (WMS). When employing WMS, the laser
drive current is modulated with a kHz sine wave as the laser is rapidly tuned.
A lock-in amplifier is then used to detect the harmonic component of the signal
that is at twice the modulation frequency (2f), as shown in Figure 1–4. This
phase-sensitive detection enables the filtering of low-frequency noise caused
by turbulence in the sample gas, temperature and/or pressure fluctuations,
low-frequency noise in the laser beam or thermal noise in the detector.
With the resulting low-noise signal and use of fast post-processing algorithms,
reliable parts per million (ppm) detection levels are possible (depending on
target and background species) at real-time response rates (on the order of 1
second).
All Endress+Hauser TDL gas analyzers employ the same design and hardware
platform. Measuring different trace gases in various mixed hydrocarbon
background streams is accomplished by selecting a different optimum diode
Normalized
2f Signal
Wavelength [a.u.]
Signal [a.u.]
Figure 1–4 Typical normalized 2f signal; species
concentration is proportional to the peak height

SS500XP/SS2000XP Gas Analyzer BA02183C
1–8 Endress+Hauser
laser wavelength between 750 to 3000nm, which provides the least amount of
sensitivity to background stream variations.
Getting Familiar with the Analyzer
Endress+Hauser’s SS500XP/SS2000XP analyzers are typically comprised of a
single electronics enclosure and associated measurement cell(s). Refer to
Appendix A for system drawings. On the front panel of the analyzer, the keypad
and LCD display, which serve as the user interface to the analyzer, are viewed
through a window. Internally, the control electronics drive the laser, collect the
signal, analyze the spectra and provide measurement output signals.
Power is connected to the analyzer from an external power source through the
bottom of the enclosure. Refer to Appendix A for system specifications. The
measurement cell(s) along with flow devices to control flow and pressure for
the measurement cell and the bypass loop are mounted on a panel alongside
the enclosure.
Inside the SS500XP/SS2000XP analyzer electronics enclosure is the electronics
assembly. Refer to Figure 1–6 for a view of the AC electronics assembly and
Figure 1–7 for the DC electronics assembly.
Figure 1–5 External features of the analyzer
KEYPAD/ WINDOW
PLATE/LCD
4X MOUNTING FEET
0.5 in. SLOTTED HOLE
DATA CONTROL
INPUT
POWER INPUT
GAS OUTLET
GAS INLET

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Endress+Hauser 1–9
Figure 1–6 Electronics control panel (AC) for single-
channel systems (SS500XP/SS2000XP)
TEMPERATURE
CONTROL BOARD
POWER
SUPPLY
FUSE (F1)
ASSIGNABLE
ALARM
GENERAL FAULT
ALARM
NO
COMMON
NC
4–20 mA
CURRENT
LOOP BOARD
(STACKED)
BACK-PLANE
BOARD
4–20 mA &
SERIAL
SIGNAL
CONNECTIONS
LASER DRIVER
BOARD
MEASUREMENT
CELL
POWER LINE
FILTER

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Figure 1–7 Electronics control board (DC) for single-
channel systems (SS500XP/SS2000XP)
ASSIGNABLE
ALARM
GENERAL FAULT
ALARM
NO
COMMON
NC
4–20 mA
CURRENT
LOOP BOARD
(STACKED)
4–20 mA &
SERIAL
SIGNAL
CONNECTIONS
MEASUREMENT
CELL
POWER
SUPPLY
POWER LINE
FILTER
FUSE (F2)
TEMPERATURE
CONTROL BOARD
LASER DRIVER
BOARD
BACK-PLANE
BOARD

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Fuse specifications
Fuses are located on the electronics control board, as shown in Figure 1–6 and
Figure 1–7.
If you need to replace a fuse, use only the same type and rating
of fuse as the original as listed in Table 1-1.
Table 1-1 Fuse specifications
DWG Ref. Volt-
age Description Rating
Figure 1–6 F1
120 VAC Miniature Fuse, 5 x 20 mm, Time Delay 250VAC/0.8A
240 VAC Miniature Fuse, 5 x 20 mm, Time Delay 250VAC/0.5A
Figure 1–7 F2 24 VDC Miniature Fuse, 5 x 20 mm, Time Delay 250VAC/1.6A

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THIS PAGE INTENTIONALLY LEFT BLANK

Endress+Hauser 2–1
2 - SAFETY
Potential Risks Affecting Personnel
This section addresses the appropriate actions to undertake when faced with
hazardous situations during or before service of the gas analyzer. It is not
possible to list all potential hazards within this document. The user is
responsible for identifying and mitigating any potential hazards present when
servicing the analyzer.
Mitigating risks
Refer to the instructions for each situation listed below to mitigate associated
risks.
Exposure to process gases
1. Shut off the process gas to the gas analyzer before any service that
would require opening a part of the sample plumbing.
2. Purge the system with nitrogen.
3. Shut off the nitrogen purge before opening any part of the sample
system.
Exposure to toxic gas (H2S)
Follow the procedure below if there has been any suspected leak from the
sample system and accumulated SCS enclosure.
1. Purge the SCS enclosure to remove any potentially toxic gas.
2. Test the H2S levels of the SCS enclosure using the port from the
safety purge kit to ensure the purge has cleared any toxic gas.
3. If no gas leak is detected, open the SCS enclosure door.
Technicians are expected to follow all safety protocols established
by the customer that are necessary for servicing the gas analyzer.
These may include, but are not limited to, lockout/tag-out
procedures, toxic gas monitoring protocols, personal protection
equipment (PPE) requirements, hot work permits and other
precautions that address safety concerns related to performing
service on process equipment located in hazardous areas.
Follow all safety protocols governing toxic gases and potential
leaks.

SS500XP/SS2000XP Gas Analyzer BA02183C
2–2 Endress+Hauser
Electrocution hazard
1. Shut off power at the main disconnect external to the gas analyzer.
2. Open enclosure door.
If service must be performed with power engaged (gain adjustment, etc.):
1. Note any live electrical components and avoid any contact with
them.
2. Only use tools with a safety rating for protection against accidental
contact with voltage up to 1000 V (IEC 900, ASTF-F1505-04, VDE
0682/201).
Explosion hazard
Any work in a hazardous area must be carefully controlled to avoid creating any
possible ignition sources (e.g., heat, arcing, sparking, etc.). All tools must be
appropriate for the area and hazards present. Electrical connections must not
be made or broken with power on (to avoid arcing).
Complete this action before performing any service that requires
working near the main input power or disconnecting any wiring or
other electrical components.

Endress+Hauser 3–1
3 - INSTALLATION
This section describes the processes used to initially install and configure your
SS500XP or SS2000XP. Once the analyzer arrives, you should take a few
minutes to examine the contents before installing the unit.
This section discusses:
•Unpacking and inspecting the analyzer
•Getting familiar with analyzer
•Installing the analyzer
What Should be Included in the Shipping Box
The contents of the crate should include:
•The Endress+Hauser SS500XP or SS2000XP analyzer
•CDs; Operator’s Manual and other manuals or documents as
necessary
•One external serial cable(s) to connect the analyzer to a computer
•Additional accessories or options as ordered
If any of these contents are missing, contact “Service” on page B-17.
Inspecting the Analyzer
Unpack and place the unit on a flat surface. Carefully inspect all enclosures for
dents, dings, or general damage. Inspect the inlet and outlet connections for
damage, such as bent tubing. Report any damage to the carrier.
Installing the Analyzer
Installing the analyzer is relatively easy and requires only a few steps that,
when carefully followed, will ensure proper mounting and connection.
Endress+Hauser Class I Division 2 gas analyzers use a non-
incendive protection method, and as such all portions of the local
installation codes apply. The maximum allowed inductance to
resistance ratio (L/R ratio) for the field wiring interface must be
less than 25 μH/Ω. The maximum total loop capacitance shall be
0.27 microfarads.
Avoid jolting the instrument by dropping it or banging it against a
hard surface. Do not attempt to pick up the instrument using the
sample cell. Either action may disturb the optical alignment.

SS500XP/SS2000XP Gas Analyzer BA02183C
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This section includes:
•Hardware and tools for installation
•Mounting the analyzer
•Connecting Electrical Power to the Analyzer
•Connecting the Output Signals
•Connecting the Gas Lines
Hardware and tools for installation
Depending on the particular model, the configuration of accessories and
options ordered, you may need the following hardware and tools to complete
the installation process.
Hardware
•Membrane separator filter (if not included) 1
•Pressure regulator (if not included) 1
•Stainless steel tubing (Endress+Hauser recommends using 1/4 in.
O.D. x0.035 in. wall thickness, seamless stainless steel tubing)
•1/2 in. conduit hubs
•Conduit (rigid)
•Source of plant nitrogen gas (4 SCFH) for purge unit(s), if applicable
•1/2 in. or 3/8 to 16 in. Unistrut (or equivalent) bolts and spring nuts
•3/8 in. x 1-1/2 in. machine screws and nuts (for non-Unistrut
installation)
•3/4 in. or 1/2 in. EYS (or equivalent) seals
•1/4 in. Swagelok 400-1-4 (or equivalent) connectors
Tools
•Hand drill and bits
•Tape measure
•Level
•Pencil
•Socket wrench set
•Screw driver
•Crescent wrench
•9/16 in. open-end wrench
1 If your system comes equipped with a sample conditioning system, refer to the Sample
Conditioning System (SCS) manual for more information.