Trane TruSense RMWH Installation and operating instructions

TruSense™ Refrigerant Monitor
Installation, Operation, and Maintenance
August 2020 RMWH-SVX001C-EN
Model: RMWH
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.

© 2020 Trane RMWH-SVX001C-EN
Introduction
Read this manual thoroughly before operating or servicing
this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Your personal safety and the proper operation of
this machine depend upon the strict observance of these
precautions.
The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTIONsIndicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
NOTICE Indicates a situation that could result in
equipment or property-damage only
accidents.
Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment. Trane advocates the responsible handling of
all refrigerants-including industry replacements for CFCs
and HCFCs such as saturated or unsaturated HFCs and
HCFCs.
Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified according to local rules. For
the USA, the Federal Clean Air Act (Section 608) sets forth
the requirements for handling, reclaiming, recovering and
recycling of certain refrigerants and the equipment that is
used in these service procedures. In addition, some states
or municipalities may have additional requirements that
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
WARNING
Personal Protective Equipment (PPE)
Required!
Failure to wear proper PPE for the job being undertaken
could result in death or serious injury. Technicians, in
order to protect themselves from potential electrical,
mechanical, and chemical hazards, MUST follow
precautions in this manual and on the tags, stickers,
and labels, as well as the instructions below:
• Before installing/servicing this unit, technicians
MUST put on all PPE required for the work being
undertaken (Examples; cut resistant gloves/sleeves,
butyl gloves, safety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Safety Data Sheets
(SDS) and OSHA guidelines for proper PPE.
• When working with or around hazardous chemicals,
ALWAYSrefer tothe appropriateSDSandOSHA/GHS
(Global Harmonized System of Classification and
Labeling of Chemicals) guidelines for information on
allowable personal exposure levels, proper
respiratory protection and handling instructions.
• If there is a risk of energized electrical contact, arc, or
flash, technicians MUST put on all PPE in accordance
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.

WARNING
Follow EHS Policies!
Failure to follow instructions below could result in
death or serious injury.
• All Trane personnel must follow the company’s
Environmental, Health and Safety (EHS) policies
when performing work such as hot work, electrical,
fall protection, lockout/tagout, refrigerant handling,
etc. Where local regulations are more stringent than
these policies, those regulations supersede these
policies.
• Non-Trane personnel should always follow local
regulations.
Introduction
RMWH-SVX001C-EN 3
Copyright
This document and the information in it are the property of
Trane, and may not be used or reproduced in whole or in
part without written permission. Trane reserves the right
to revise this publication at any time, and to make changes
to its content without obligation to notify any person of
such revision or change.
Trademarks
All trademarks referenced in this document are the
trademarks of their respective owners.
Revision History
Updated for Trane Technologies.

4RMWH-SVX001C-EN
Table of Contents
General Information . . . . . . . . . . . . . . . . . . . . . 6
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Identifying Your Unit . . . . . . . . . . . . . . . . . . . 7
Visible Alarming Devices . . . . . . . . . . . . . . . 9
Touchscreen Display . . . . . . . . . . . . . . . . . 9
Strobe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Audible Alarming Devices . . . . . . . . . . . . . . 9
Internal Horn . . . . . . . . . . . . . . . . . . . . . . . . 9
Optional External Horn . . . . . . . . . . . . . . . 9
Optional External Alarm Activation and Si-
lencing Stations . . . . . . . . . . . . . . . . . . . . . . . 9
Communications . . . . . . . . . . . . . . . . . . . . . . 9
Digital Communication . . . . . . . . . . . . . . . 9
Analog Communication . . . . . . . . . . . . . . 10
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Receiving, Unpacking, and Inspecting . . . 11
Mounting Guidelines . . . . . . . . . . . . . . . . . . 11
Sample and Exhaust Lines . . . . . . . . . . . . . 12
Tubing Material . . . . . . . . . . . . . . . . . . . . 12
Routing and Placement . . . . . . . . . . . . . . 12
End-of-Line Filters . . . . . . . . . . . . . . . . . . 13
Connections . . . . . . . . . . . . . . . . . . . . . . . 13
Exhaust Venting . . . . . . . . . . . . . . . . . . . . 13
Wiring and Grounding . . . . . . . . . . . . . . . . 13
Electrical Power Supply Requirements . . 15
Relay Outputs . . . . . . . . . . . . . . . . . . . . . . . . 15
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Language/Date & Time/Password . . . . . . . 16
Point Configuration . . . . . . . . . . . . . . . . . . . 18
Gas Configuration . . . . . . . . . . . . . . . . . . . . 19
Relay Configuration . . . . . . . . . . . . . . . . . . . 21
Communications Output . . . . . . . . . . . . . . . 22
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Routine Operation . . . . . . . . . . . . . . . . . . . . 25
Starting Calibration . . . . . . . . . . . . . . . . . 25
Stopping Calibration . . . . . . . . . . . . . . . . 26
Zero Gas Calibration . . . . . . . . . . . . . . . . . . 26
Span Gas Calibration . . . . . . . . . . . . . . . . . .27
Unsuccessful Calibrations . . . . . . . . . . . . . .29
Routine Operation . . . . . . . . . . . . . . . . . . . . . . .30
Dashboard Overview . . . . . . . . . . . . . . . . . . .30
Point Details . . . . . . . . . . . . . . . . . . . . . . . . . .30
Point Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Automatic Point Hold . . . . . . . . . . . . . . . . .30
Manual Point Hold . . . . . . . . . . . . . . . . . . .30
Predictive Warnings . . . . . . . . . . . . . . . . . . .31
Cautions, Warnings, and Alarms . . . . . . . .31
Non-Latching Events . . . . . . . . . . . . . . . . .32
Latching Events . . . . . . . . . . . . . . . . . . . . .32
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Noncritical Faults . . . . . . . . . . . . . . . . . . . .32
Critical Faults . . . . . . . . . . . . . . . . . . . . . . .33
Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
All . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Calibration . . . . . . . . . . . . . . . . . . . . . . . . .34
Edit Settings . . . . . . . . . . . . . . . . . . . . . . . . . .35
Preferences . . . . . . . . . . . . . . . . . . . . . . . . .35
Gas Configuration . . . . . . . . . . . . . . . . . . .36
Point Configuration . . . . . . . . . . . . . . . . . .37
Relay Configuration . . . . . . . . . . . . . . . . . .38
Communications Output . . . . . . . . . . . . . .39
About . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Flow Diagnostics . . . . . . . . . . . . . . . . . . . . . .41
Sensor Performance . . . . . . . . . . . . . . . . . . .42
Pump Performance . . . . . . . . . . . . . . . . . . . .43
Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Scheduled Maintenance . . . . . . . . . . . . . . . .46
Examine and Replace End-of-Line Filters 46
Examine and Replace Internal Inline Filters .
47
Replace Fuses . . . . . . . . . . . . . . . . . . . . . . .48

Table of Contents
RMWH-SVX001C-EN 5
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Touchscreen Display . . . . . . . . . . . . . . . . . . 49
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Technical Specifications/Equipment Ratings
50
Gas Reading Accuracy . . . . . . . . . . . . . . . . 50
Troubleshooting Guidelines . . . . . . . . . . . . . 51
Ordering Information . . . . . . . . . . . . . . . . . . . 52
Replacement Parts . . . . . . . . . . . . . . . . . . . . 52
Appendix A: Startup Check List . . . . . . . . . . 54
Appendix B: Installation of Optional Equipment
55
Strobe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
External Horn . . . . . . . . . . . . . . . . . . . . . . . . 55
External Alarm Activation Station . . . . . . . 56
External Alarm Silencing Station . . . . . . . 56
Appendix C: Default Settings . . . . . . . . . . . . 57
Alarm Setpoints . . . . . . . . . . . . . . . . . . . . . . 57
Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Appendix D: MODBUS Holding Registers . 58
TruSense RMWH Refrigerant Monitor—MOD-
BUS RTU (Holding Registers) . . . . . . . . . . 58
RESET Button Actions . . . . . . . . . . . . . . . . . 60
Unit Status Flags . . . . . . . . . . . . . . . . . . . . . 60
Channel Status Flags . . . . . . . . . . . . . . . . . . 61
Gas Types . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Appendix E: BACnet Objects . . . . . . . . . . . . . 62
TruSense RMWH Refrigerant Monitor—BAC-
net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
RESET Button Actions . . . . . . . . . . . . . . . . . 64
Unit Status Flags . . . . . . . . . . . . . . . . . . . . . 64
Channel Status Flags . . . . . . . . . . . . . . . . . . 65
Gas Types . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6RMWH-SVX001C-EN
General Information
The TruSense™ RMWH Refrigerant Monitor, hereafter
also referred to as “the device”, is a gas monitor intended
for indoor use in mechanical equipment rooms or
commercial spaces where refrigerant equipment, such as
centrifugal chillers, is used. The device is specified to
support compliance with federal, state, and local safety
codes that govern emissions.
Note: For any maintenance procedure provided in this
manual, use only genuine Trane replacement parts.
Repair or alteration of the TruSense™ RMWH
Refrigerant Monitor system beyond the scope of
these maintenance instructions or by anyone other
than authorized Trane service personnel can cause
incorrect operation of the device. For a list of
approved parts and how to order them, refer to
“Ordering Information,” p. 52.
WARNING
Proper Mounting Location!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury.
DO NOT install the device in areas that contain a
flammable mixture of gas and air.
WARNING
Safety Instructions!
Failure to follow instructions in this section could result
in death or serious injury.
Make sure the device is installed in a clean, dry area that
is protected from vibration, including but not limited to a
chiller, and heat sources.
Do not paint the device. Do not paint near any of the
sample line inlets. If painting is done near the device, make
sure that paint is not deposited on the sample inlet fittings.
Paint deposits can prevent correct operation of the device.
Make sure the sample inlet lines to the device are clean
and noncondensing.
Avoid any installation where condensation can collect.
Condensation can clog or block sample lines, which will
prevent the device from receiving new or fresh gas
samples in the area being monitored.
Install and maintain end-of-line filters in all sample inlet
lines. Refer to “End-of-Line Filters,” p. 13.
The only absolute method of ensuring correct overall
operation of a gas detection instrument is to do a check
with a known concentration of the gas for which it has been
calibrated. Do a calibration check as part of the installation
and initial setup. Refer to “Initial Setup,” p. 25. Do routine
calibrationchecksthereafter.Referto“RoutineOperation,”
p. 25.
Install a circuit breaker for the incoming power
connections of the device. Put the circuit breaker in a
location that is easy to access and near the device. Clearly
mark the circuit breaker as the disconnecting unit for the
device.
Properly vent the exhaust of the TruSense™ RMWH
Refrigerant Monitor system to a safe area. Improper
venting of the exhaust can cause serious personal injury or
death. Refer to “Exhaust Venting,” p. 13.
To prevent unauthorized or untrained personnel from
opening the device enclosure, install a locking mechanism
through the metal loop on either latch on the left side of the
device (refer to Figure 2, p. 7).
Perform periodic leak tests on all sample lines.
Do not exceed the relay contact rating listed in “Technical
Specifications/Equipment Ratings,” p. 50. Otherwise relay
operation could fail.
NOTICE
Equipment Damage!
Failure to follow instructions below could result in
equipment damage. The device is intended for indoor
use only. Do not use the device for outdoor
applications.

RMWH-SVX001C-EN 7
Description
The TruSense™ RMWH Refrigerant Monitor provides
continuous monitoring of refrigerant gas levels for up to
16 points in nonhazardous areas. With the ability to read
down to 1 ppm, the device provides a response to a
refrigerant leak, supporting the safety of personnel and
the environment, and equipment efficiency. The device
uses patented Photoacoustic Infrared technology to allow
the accurate measurement of refrigerant gases with
minimum interference from other vapors. The device
monitors refrigerant gases up to 1000 ppm with an ability
to maintain a gas list through an internal refrigerant
library.
The TruSense™ RMWH Refrigerant Monitor minimizes
unnecessary maintenance costs associated with
calibration and sensors by utilizing a centralized sample
draw system. The device is factory calibrated for six
specific refrigerants, with the flexibility to adjust the gas of
interest in the field.
The device offers three levels of alarm—caution, warning,
and alarm—that are all configurable through the intuitive
touchscreen display. Fault and service notifications
provide alerts when servicing is necessary. Audible and
visual indications such as horns and strobes provide alerts
about refrigerant leaks.
Digital communications can be transmitted using the
Modbus remote terminal unit (RTU) or BACnet™ master/
slave token passing (MS/TP) protocol. Analog
communications can be transmitted using a 4–20 mA or 
0–10 Vdc current loop.
The TruSense™ RMWH Refrigerant Monitor requires
minimal maintenance and incorporates predictive
diagnostics that continuously check key detector
components to ensure proper operation. When the device
is installed, operated, and maintained according to Trane’s
recommendations, it provides reliable protection and
long-term stability.
Identifying Your Unit
Figure 1. Front of device
1. 7-in. resistive touchscreen user interface
2. Power indicator
Figure 2. Back of device
1. Mounting locations (10 in. x 14-5/8 in.)
1
2
1
1

Figure 3. Right side of device
Description
8RMWH-SVX001C-EN
1. AC power wiring cutout
2. Protective earth grounding cutout (optional)
3. Relay wiring cutout
4. Approval and unit identification label
Figure 4. Left side of device
]
1. Latches (lockable with padlock)
2. Signal wiring cutouts
Figure 5. Bottom of device
1. Sample line identification labels
2. Internal alarm sounder
3. Calibration port
4. IP rated vent
5. Exhaust port (do not block)
1
2
3
4
1
1
2
3
4
5
1
2

Figure 6. Internal touchpoints
Description
RMWH-SVX001C-EN 9
1. Fuses
2. AC wiring cover
3. Internal filters
4. ESD tie-off location
Visible Alarming Devices
The device provides visible alarm indicators through the
touchscreen display and strobe.
Touchscreen Display
After the initial setup configuration, the touchscreen
display shows a dashboard with the main function buttons
and tiles for the points that are enabled.
Notifications for all predictive warnings, alarms, and faults
show on the dashboard.
Strobe
The strobe provides a user-configurable visual indication
of a gas leak.
Audible Alarming Devices
The device provides audible alarm indicators through the
internal alarm and optional external horn.
Internal Horn
A horn inside the device provides an audible indicator of
a gas leak. The level of sound output from the internal horn
is adjustable. To adjust the level of sound output, turn the
sounder clockwise or counterclockwise.
Optional External Horn
An optional external horn can be mounted in a location
away from the device to provide an audible indicator of a
gas leak.
For a list of approved parts and how to order them, refer to
“Ordering Information,” p. 52.
For installation instructions, refer to “Appendix B:
Installation of Optional Equipment,” p. 55.
Optional External Alarm
Activation and Silencing Stations
The device supports optional external stations for the
activation and silencing of audible alarms.
Normally closed alarm activation and silencing switches
can be wired in a single loop with a total maximum loop
length of 2500 ft (762 m).
For a list of approved parts and how to order them, refer to
“Ordering Information,” p. 52.
For installation instructions, refer to “Appendix B:
Installation of Optional Equipment,” p. 55.
Communications
The device has both digital and analog outputs for use
with external controllers or building management
systems.
Digital Communication
The device is capable of MODBUS® RTU or BACnet® 
MS/TP outputs. For setup instructions, refer to
“Communications Output,” p. 22.
1
2
3
4

Description
10 RMWH-SVX001C-EN
For a list of the registers that are available for exchange
with the MODBUS® controller, refer to “Appendix D:
MODBUS Holding Registers,” p. 58.
For a list of the BACnet® Objects that are available for
exchange with the BACnet® controller, refer to “Appendix
E: BACnet Objects,” p. 62.
Analog Communication
The device is capable of the following types of analog
outputs:
• 4–20 mA, isolated, current sourcing
• 0–10 Vdc for gas sample point identification
Full scale is 1000 ppm.
Normal gas readings are at 4–20 mA. The reading is
proportional to the detected gas concentration.
For the factory default of 100 percent full scale setting
(0.016 mA = 1 ppm), refer to the following table.
Table 1. Scale analog output: 4–20 mA
Output (mA) Gas Concentration (ppm)
4 0
563
6125
7188
8250
9313
10 375
11 438
12 500
13 563
14 625
15 688
16 750
17 813
18 875
19 937
20 1000
Table 2. Analog output settings
Warm-up •Default=3.5mA
• User adjustable between 
0 and 3.75 mA
Calibration (non-configurable) •3.0mA
Fault •Default=2.0mA
• User adjustable between 
0.5 and 3.75 mA
Device over range (non-configurable) •21mA
The voltage output can be used to identify any active gas
sample line.
Table 3. 0–10 Vdc
Sample Line
Vdc
4 or 8 pt system 16 pt system
1 1 1.0
2 2 1.5
3 3 2.0
4 4 2.5
5 5 3.0
6 6 3.5
7 7 4.0
8 8 4.5
9 — 5.0
10 —5.5
11 —6.0
12 —6.5
13 —7.0
14 —7.5
15 —8.0
16 —8.5
While the device is in calibration mode, the output is
10 Vdc.

RMWH-SVX001C-EN 11
Installation
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify that no power is present
with a voltmeter. To prevent electrical shock, the circuit
board cover must be in place when power is on.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
Receiving, Unpacking, and
Inspecting
1. Upon receipt of the device, inspect the shipping
container for signs of damage. Report any damage to
the carrier and record the information on the delivery
receipt.
2. Carefully remove the device from its shipping
container to avoid causing damage to sensitive
electrical components. If damage has occurred, file the
appropriate claim with the shipping carrier
immediately.
3. Review all contents of the shipping container to make
sure all of the following components are included:
a. Device
b. Instruction manual CD
c. End-of-line filters (quantity determined by number
of ports ordered)
d. Remote horn (if equipped)
e. Protective foam
4. Notify Trane of any shortages immediately.
5. Keep the original packaging in case it is necessary to
return the device for service.
6. Release the two latches on the left side of the device.
7. Open the enclosure.
8. Carefully inspect the internal components and
assemblies for damage or shortages. If damage has
occurred, file the appropriate claim with the shipping
carrier immediately.
9. Before installation and use, keep the device in a dry,
secure place in the original shipping container.
Mounting Guidelines
WARNING
Proper Mounting Location!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury.
DO NOT install the device in areas that contain a
flammable mixture of gas and air.
Do not mount the device directly to chiller, piping, or
piping supports.
Mount the device:
• In a location that is easy to access and visible to
personnel before they go into the area being
monitored.
• To a rigid surface that does not have vibration or
mechanical shock.
• In a vertical position.
• Approximately 5 ft (1.5 m) above the ground (refer to
Figure 7 and Figure 8).
• With at least 3 in. (7.62 cm) of clearance around all
sides for proper ventilation, calibration, and servicing.
Make sure there is adequate space to connect the
external wiring and sample line piping (refer to
Figure 8).
• With the appropriate hardware. Make sure the
hardware is suitable for the mounting surface and can
withstand 70 lb (9 kg) without loosening or causing
damage to the hardware or mounting surface. Use all
four mounting holes provided on the device (refer to
Figure 9).
• Away from exposure to direct solar heating and other
excessive heat sources.
• Away from wet or damp conditions.
• Away from areas that are dirty or exposed to oils or
chemicals.

Figure 7. Mounting location
Figure 8. Front of device
Figure 9. Rear of device
Installation
12 RMWH-SVX001C-EN
Sample and Exhaust Lines
Tubing Material
The device can use hard and soft tubing. The following are
acceptable tubing types:
Imperial (I-P) Units
1/4-in. OD x 1/8-in. inside diameter (ID) Polyurethane tubing (ether-
based)
1/4-in. OD x 3/161/4-in. ID Polyurethane tubing (ether-based)
1/4-in. OD Copper tubing
1/4-in. OD Stainless steel tubing
International System (SI) Units
6-mm OD x 4-mm ID Polyurethane tubing (ether-based)
6-mm OD Copper tubing
6-mm OD Stainless steel tubing
Note: Use the appropriate tools to give a clean, smooth
end to the tubing when it is cut.
Routing and Placement
Trane recommends the use of at least two gas-monitoring
points per chiller for sufficient detection monitoring. Due
to installation and application variations, each system
must be analyzed individually.
Do a smoke test of the mechanical room to determine the
flow pattern and allow for optimal placement of the
sample lines. For a list of approved parts and how to order
them, refer to “Ordering Information,” p. 52.
Keep the total line length of a point, including the sample
line and exhaust line, at less than 1200 ft (366 m). Keep
lines as short as possible to minimize the transport time of
the device.
Table 4. Transport time
Line Length (ft) 4 pts 8 pts 16 pts
019 s 19 s 19 s
50 19 s 19 s 19 s
100 19 s 19 s 19 s
150 19 s 19 s 19 s
200 19 s 19 s 19 s
250 19 s 19 s 19 s
300 1 m 35 s 2 m 51 s 5 m 23 s
350 1 m 35 s 2 m 51 s 5 m 23 s
400 2 m 51 s 5 m 23 s10 m 27 s
450 2 m 51 s 5 m 23 s 10 m 27 s
500 2 m 51 s 5 m 23 s 10 m 27 s
Note: Transport time is similar for all tubing
configurations.
TruSense
Refrigerant Monitor
Refrigerant
Storage
Chillers Sampling Points Entry Way Signalling

Installation
RMWH-SVX001C-EN 13
Typically, refrigerants collect near the floor. Install the
sample points 12–18 in. (30–46 cm) above the floor.
For installations where water condensation in the sample
lines is likely, Trane recommends installing a water trap
filter such as a Parker P/N F504-01AHX67 or equivalent.
End-of-Line Filters
WARNING
Risk of Asphyxiation!
Failure to follow instructions below could cause
inaccurate readings and improper gas monitoring
which could result in death or serious injury.
Use and maintain end-of-line filters to ensure proper
readings and prevent damage to internal components.
Make additional servicing necessary.
Install an end-of-line filter (Trane P/N FLR04743) in each
sample line to decrease contaminants in the sample lines
and device.
Figure 10. End-of-line filter
Do the following procedure to install end-of-line filters:
1. Remove the new end-of-line filter from the bag.
2. Slide the end of the end-of-line filter with flexible
tubing onto the sample line tubing. Make sure the
arrow on the body of the filter (refer to Figure 10) points
in the direction of air flow into the sample line.
Examine and replace the end-of-line filters at regular
intervals. The appropriate interval for replacement is
determined by the environment of the installation.
For a list of approved parts and how to order them, refer to
“Ordering Information,” p. 52.
Connections
WARNING
Risk of Asphyxiation!
Failure to follow instructions below could cause
inaccurate readings and improper gas monitoring
which could result in death or serious injury.
Install tubing with large enough bend radii to prevent
kinking or pinching. Kinking or pinching of the tubing
could result in insufficient monitoring of an area. Before
connecting tubing to the device, clean all tubing with
compressed air or nitrogen to remove debris.
The device has Swagelok® compression fittings for
connections to the sample and exhaust lines. These
fittings accept the hard and soft tubing specified in
“Tubing Material,” p. 12.
Do the following procedure to connect the sample and
exhaust lines:
1. Remove the cap from the compression fitting.
2. Insert the tubing fully into the compression fitting and
against the shoulder.
3. Turn the nut until it is finger-tight on the tubing.
4. Mark the nut at the 6 o’clock position.
5. While holding the body of the fitting steady, tighten the
nut 1-1/4 turns to the 9 o’clock position.
Exhaust Venting
WARNING
Risk of Asphyxiation!
Failure to follow instructions below could cause
inaccurate readings and improper gas monitoring
which could result in death or serious injury.
Make sure to remove the cap from the exhaust port
before operating the device.
The use of exhaust tubing reduces pump noise from the
device.
Make sure to vent the exhaust of the device to the outside
atmosphere (preferred) or a safe area.
Do not use inline or end-of-line filters in the exhaust line.
If possible, route the exhaust line so venting occurs to the
outside atmosphere. Make sure to protect the end of the
exhaust tube from elements such as water, dirt, snow, ice,
and insects, which can cause clogs and prevent efficient
venting.
If exhaust venting occurs indoors, make sure to route the
exhaust line to:
• An area that is not monitored for refrigerant gases
• An area away from personnel
Wiring and Grounding
WARNING
Proper Grounding Required!
Failure to follow instructions below could result in
death or serious injury from electrocution.
Make sure the device chassis is connected to the earth
ground at the ground bar.
Note:
•Installations that require conformity to the CE mark
must have a connection between the TruSense™
RMWH Refrigerant Monitor device and a nearby earth
ground potential.

Installation
14 RMWH-SVX001C-EN
•To achieve this connection, install a 10 AWG or larger
copper wire between the grounding lug terminal strip
on the right side of the TruSense™ RMWH Refrigerant
Monitor device and the grounding point (protective
earth). The wire length cannot be longer than 6 ft (2 m).
The TruSense™ RMWH Refrigerant Monitor Wiring
Diagram (Figure 11) gives the details of the wiring
requirements for the device.
Figure 11. TruSense™ RMWH refrigerant monitor wiring diagram

Installation
RMWH-SVX001C-EN 15
Electrical Power Supply
Requirements
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify that no power is present
with a voltmeter. To prevent electrical shock, the circuit
board cover must be in place when power is on.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
NOTICE
Electrostatic Discharge!
Electrostatic discharge can short equipment circuitry.
Ensure that you are properly grounded before handling
sensitive electronic equipment.
The device uses a power supply that accepts inputs of 100–
240 Vac, 50/60 Hz, 200 VA maximum.
Make sure the device is connected directly to the ac power
source through a dedicated circuit breaker.
Use an approved three-conductor wire (minimum
16 AWG), rated 300 Vac at 221°F (105°C), to complete the
ac power connection.
Use only conduit hubs and hardware that are suitable for
fiberglass enclosures.
Do the following procedure to connect electrical power:
1. Disconnect electrical power.
2. Install a circuit breaker for the incoming power
connections of the device.
a. Put the circuit breaker in a location that is near the
device and easy to access.
b. Clearly mark the circuit breaker as the
disconnecting unit for the device.
3. If applicable, remove the locking mechanism.
4. Release the two latches on the left side of the device.
5. Open the enclosure.
6. Attach the ESD wrist strap to the ESD connection point
inside the enclosure.
7. Use a 1/4-in. hex driver to remove the four hex nuts on
the circuit board cover.
8. Remove the circuit board cover.
9. Remove the ac power wiring hole plug.
10. Install conduit hubs that are suitable for fiberglass
enclosures through the ac power wiring hole plug
openings.
11. Put the AC power wiring through the conduit.
12. Connect the ac power wiring to the L1 (HOT) and L2
(NEUTRAL) input terminals. Make sure the connectors
are seated securely.
13. Connect the ac power ground wire to the ground bar so
the device chassis ground is connected to the earth
ground.
14. Make sure the wiring is not touching the sensor
assembly.
15. Install the circuit board cover.
16. Use a ¼-in. hex driver to install the 4 hex nuts on the
circuit board cover.
17. Disconnect the ESD wrist strap from the ESD
connection point inside the enclosure.
18. Close the enclosure.
19. Latch the two latches.
20. If applicable, attach the locking mechanism.
21. Supply electrical power to the device.
Relay Outputs
Refer to the Figure 11, p. 14 for details.
The TruSense™ RMWH Refrigerant Monitor has the
following five single-pole, double-throw (SPDT) relays.
The relay contacts are rated 8 A at 240 Vac/24 Vdc. Each
relay can be connected as normally open (NO) or normally
closed (NC).
•Fault
•Alarm
• Warning
•Caution
•Horn

16 RMWH-SVX001C-EN
Initial Setup
WARNING
Risk of Asphyxiation!
Failure to follow instructions below could cause
inaccurate readings and improper gas monitoring
which could result in death or serious injury.
Make sure to remove the cap from the exhaust port
before operating the device.
Remove the protective film from the touchscreen.
When power is supplied to the device, the green power
indicator LED (refer to preceding figure) illuminates and
the touchscreen shows a logo and a loading bar. The
loading bar indicates the status of the initializing process.
If an error occurs during start-up, a pop-up identifies the
specific problem.
Language/Date & Time/Password
1. On the Initial Setup screen, select Language/Date &
Time/Password.
2. On the Language Setup screen, select the
appropriate language, then select Next.
When a language is selected, the change is
instantaneous.
3. On the Date & Time Setup screen, select the Date
tab.
The date format can be MM/DD/YYYY or DD/MM/YYYY
depending on the language setting.
4. Select the Month/Day/Year fields, and use the
alphanumeric keypad pop-up to enter values. 
Select to accept the values.
Note: An entry for the date is necessary to continue.
If this error pop-up shows, select OK to return
to the previous screen and supply a value.
5. Select the Time tab.

Initial Setup
RMWH-SVX001C-EN 17
6. Select the Hour/Minute fields, and use the
alphanumeric keypad pop-up to enter values. 
Select to accept the values.
The time format can be 12 hours (AM/PM) or 24 hours
depending on the language setting.
7. If applicable, select AM or PM.
8. Select Next.
Note: A valid entry for the time is necessary to
continue. If this error pop-up shows, select OK
to return to the previous screen and supply a
value.
9. On the Password screen, select Disabled or Enabled
to disable or enable password protection for editable
screens.
If password protection is disabled, the Create
Password and Verify Password fields are inactive.
Note: If password protection is enabled, do the
following:
a. Select the Create Password field, and use the
alphanumeric keypad pop-up to enter a value. 
Select to accept the value.
b. Select the Verify Password field, and use the
alphanumeric keypad pop-up to enter a value.
Select to accept the value.
10. Select Next.
If password protection is enabled, the Password
Required pop-up will show when any user tries to
change an editable screen.
11. The Initial Setup screen shows a check mark beside
the Language/Date & Time/Password step to
indicate that it is complete. Select Continue to go to
the point configuration setup.

Initial Setup
18 RMWH-SVX001C-EN
Point Configuration
Note: At initial setup, all points except Point 1 are
disabled by default and are inactive on the Point
Configuration screen. Configuration of Point 1 is
required for device initialization.
1. On the Point Configuration screen, select Point 1.
2. Select Next.
3. On the Point Configuration: Point # screen, select
Enable.
4. Select the Name field, and use the alphanumeric
keypad pop-up to assign a name with up to
18 characters. Select to accept the value.
The entire 18 characters will only show on the Point
Detail screen. Only 10 characters will show on the
Point Configuration screen.
5. Select Save.
6. Repeat Step 1 through Step 5 until all of the necessary
points have been configured.
7. On the Point Configuration screen, select Next.
8. The Initial Setup screen shows a check mark beside
the Point Configuration step to indicate that it is
complete. Select Continue to go to the gas
configuration setup.

Initial Setup
RMWH-SVX001C-EN 19
Gas Configuration
1. On the Select Gas screen, select an empty gas slot.
Note: A maximum of six slots or gases can be
configured.
Note: If Next is selected without configuring a gas, a
warning pop-up provides an alert that default
settings will be applied across all points.
To accept the default settings and bypass the gas
configuration step, select OK. Otherwise, select
Cancel to return to the Select Gas screen and select
a gas slot.
2. On the Gases tab of the Configure Gas screen, select
from the list of possible configurable gases. The screen
header changes to show the selected gas.
Note: When a gas is selected, the Save button becomes
active. The interface does not automatically move
to the Setpoints tab.
If Save is selected without adjusting the setpoints for
cautions, warnings, and alarms, the default setpoint
settings will be used for the selected gas.
3. Select the Setpoints tab.
4. Select the Edit button for Caution, Warning, or Alarm,
as applicable.
Note: If the Setpoints tab is selected but a gas has
not been selected, the options on the
Configure Gas screen will be inactive.
The options for the configuration settings for cautions,
warnings, and alarms are identical.
5. In the configuration pop-up, for State, select Enabled
or Disabled.
If Disabled is selected, all other options are inactive.
Go to Step 8.
6. For Setpoint, use the and buttons to adjust
the value.
7. For Action, select Latching or Non-Latching.
Note: For a definition of latching and non-latching
events, refer to “Cautions, Warnings, and
Alarms,” p. 31.
For a list of default settings, refer to “Appendix C:
Default Settings,” p. 57.
Use the scroll bar to see all of the configuration
options.
8. To associate an audible horn or a visual strobe with the
event, for Alarm Indication, select the Horn and/or
Strobe check boxes.

Initial Setup
20 RMWH-SVX001C-EN
9. Select Done to accept the settings and return to the
gas-specific configuration screen, which shows the
updated settings.
10. Repeat Step 2 through Step 9 until all event setpoints
have been configured.
11. Select the Points tab.
12. Select the applicable checkbox to assign a point to the
gas.
Note: If the Points tab is selected but a gas has not
been selected, the options on the Configure
Gas screen will be inactive.
Only one gas can be assigned to a single point. Points
that have already been assigned a gas are not available
for selection.
13. Select Save.
14. Repeat Step 1 through Step 13 for each gas to be
configured.
Note: The Reset tab is not used during the initial
setup. For information about the Reset tab,
refer to “Gas Configuration,” p. 36.
15. When all applicable gases have been configured,
select Next.
16. The Initial Setup screen shows a check mark beside
the Gas Configuration step to indicate that it is
complete. Select Continue to go to the relay
configuration setup.