Trane Technologies Tracer AH541 User manual

Tracer™ AH541 Version 2
Air-Handler Controller Hardware
Installation Guide
April 2020 CNT-SVN02D-EN
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 CNT-SVN02D-EN
Introduction
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.
Failure to follow code could result in death or serious injury.

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, ALWAYS refer to the appropriate SDS
and OSHA/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
CNT-SVN02D-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.

Table of Contents
4CNT-SVN02D-EN
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Agency listing/compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Additional components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installing the frame-mounted Tracer AH541 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Enclosure requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installing the termination board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mounting the enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Selecting a mounting location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating environment requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mounting the enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring high-voltage ac power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Local power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Circuit requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring high-voltage power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Installing the pressure sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installation process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Checking the pressure sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Wiring inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Required inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Input/output wiring guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Wire routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Screw-terminal locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Binary outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Analog outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Zone sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Analog inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Binary inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Installing the circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
To install the circuit board: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table of Contents
CNT-SVN02D-EN 5
Installing the door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Removing the door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Installing the stand-alone operator display . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Connecting the portable operator display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Setting up the operator display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Setting up time and date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Calibrating the operator display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Adjusting brightness and contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Verifying operation and communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Test button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Performing a manual output test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Service Pin button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Interpreting LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Interpreting diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Checking the earth ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

6CNT-SVN02D-EN
Overview
This guide shows how to install the Tracer AH541 air-handler controller.
Product description
The Tracer AH541 air-handler controller is a low-cost, direct digital controller. It controls a wide
variety of air-handlers and offers the following features:
• Factory programming of many unit configurations and sequences of operation simplifies
installation and brings consistency to the air-handler controllers on a site
• Interoperability through Comm5 communications. (Comm5 is Trane’s implementation of
LonTalk®.)
• Support of the LonMark® Space Comfort Controller (SCC) profile and the Discharge Air
Controller (DAC) profile for air-handlers
• Operates as a stand-alone device, as part of a peer-to-peer network, or as part of a building
automation system (BAS)
Specifications
The Tracer AH541 conforms to the specifications shown in Table 1.
Table 1.
Dimensions
(see Figure 5 on page 9 for
dimensional drawing)
16 ½ in. × 14 ¾ in. × 5 ½ in.
(418 mm × 373 mm × 140 mm)
Weight 15 lb (7 kg)
Operating temperature
Without display: From –40°F to 158°F 
(–40°C to 70°C)
With display: From 32°F to 122°F (0°C to 50°C)
Storage temperature
Without display: From –40°F to 185°F 
(–40°C to 85°C)
With display: From –13°F to 149°F 
(–25°C to 65°C)
Humidity 5–95% non-condensing
Altitude 6500 ft (2000 m)
Installation Category 3
Pollution Degree 2
High-voltage power
requirements
North America: 98–132 Vac, 1 A maximum, 1 phase
Other: 196–264 Vac, 1 A maximum, 1 phase
Tracer AH541 specifications

CNT-SVN02D-EN 7
Overview
Agency listing/compliance
UL and C-UL:
UL 916 Energy Management
CUL C22.2 No. 205-M1985 Signal Devices
FCC:
CFR 47, Part 15, Subpart A, Class A
CE:
Emissions
EN55022 Class B
EN61000-3-2
EN61000-3-3
Immunity
EN50082-2 Industrial
Additional components
The Tracer AH541 controller requires additional components for certain applications and has
several options for adding an operator display.
Power transformer
The frame-mounted Tracer AH541, which ships without an enclosure, requires a UL-listed Class 2
transformer providing 70 VA at 24 Vac.
Operator display
The operator display is available in three models (see Figure 1, p. 8):
• Door-mounted operator display
• Stand-alone operator display, for mounting on a wall up to 150 ft (46 m) from the controller
• Portable operator display

8CNT-SVN02D-EN
Overview
Figure 1. Operator display models
Door-mounted operator display Stand-alone operator display Portable operator display
Required tools
To install the Tracer AH541 controller and check it for proper operation, you will need the following
tools:
•Drill
• Phillips-head screwdriver
• Small flat-tip screwdriver (for terminal screws)
• Digital multi-meter

CNT-SVN02D-EN 9
Installing the frame-mounted Tracer AH541
This section applies only to the frame-mounted Tracer AH541 controller. The frame-mounted
Tracer AH541 can be used to replace older controllers in existing equipment or can be mounted in
new equipment or custom enclosures.
Enclosure requirements
Before installing the frame-mounted Tracer AH541, make sure that the enclosure or mounting
space meets the following minimum requirements:
• Minimum clearances as shown in Figure 2
• 24 Vac dedicated power supply
• Compliance with National Electrical Code and applicable local electrical codes for high-voltage
power wiring to the enclosure
Note: The Tracer AH541 with enclosure is mounted in a National Electrical Manufacturers
Association (NEMA) 1 enclosure. To meet NEMA 4 specifications, you can order the frame-
mounted Tracer AH541 (model BMTA000CA0A0) and mount it in a separately purchased
NEMA 4 enclosure.
Figure 2. Frame-mounted Tracer AH541 minimum clearances
BO5
BO4
BO3
BO2
BO1
BO6
24VAC
AO4
AO3
AO6
AO5
AO2
IN3
IN2
IN1
AO1
IN6
IN7
IN5
IN11
IN12
IN10
IN9
IN8
IN4
½ in. (13 mm)
½ in. (13 mm)
3 in. (76 mm)
for communications wires
6 in. (152 mm)
for I/O wires
½ in. 
(13 mm)

10 CNT-SVN02D-EN
Installing the termination board
Installing the termination board
To install the termination board in a separately purchased enclosure or in other equipment:
1. Remove the controller from its packaging and separate the top and bottom frames.
2. Using the bottom frame (with the termination board) as a template, mark the location of the four
mounting holes on the mounting surface (see Figure 3).
Figure 3. Frame-mounted dimensions and mounting holes
3. Set the controller aside and drill holes for #8 (4 mm) screws at the marked locations.
4. Secure the controller to the mounting surface with #8 (4 mm) screws (not supplied).
To install input/output wires, the main circuit board, and other components, follow the instructions
in the following sections.

CNT-SVN02D-EN 11
Mounting the enclosure
This section describes location requirements and shows how to mount the Tracer AH541
enclosure.
Note: The Tracer AH541 with enclosure is mounted in a National Electrical Manufacturers
Association (NEMA) 1 enclosure. To meet NEMA 4 specifications, you can order the frame-
mounted Tracer AH541 (model BMTA000CA0A0) and mount it in a separately purchased
NEMA 4 enclosure.
Selecting a mounting location
Make sure that the location meets the operating environment requirements and clearance
requirements described in the following sections. The Tracer AH541 controller must be installed
indoors. Trane recommends locating the controller:
• Near the controlled equipment to reduce wiring costs
• Where service personnel have easy access
• Where it is easy to see and interact with the operator display
• Where public access is restricted to minimize the possibility of tampering or vandalism
NOTICE:
Avoid Equipment Damage!
Install the controller in a location that is out of direct sunlight. Failure to do so may cause the
controller to overheat.
Operating environment requirements
Make sure that the operating environment conforms to the specifications listed in Table 2.
Table 2. Operating environment specifications
Temperature
Without display: From –40°F to 158°F 
(–40°C to 70°C)
With display: From 32°F to 122°F (0°C to 50°C)
Humidity 5–95% non-condensing
High-voltage power
requirements
North America: 98–132 Vac, 1 A maximum, 1 phase
Other: 196–264 Vac, 1 A maximum, 1 phase
Weight Mounting surface must be able to support 25 lb (12 kg)
Altitude 6500 ft (2000 m)
Clearances
Make sure that the mounting location has enough room to meet the minimum clearances shown
in Figure 4, p. 12. Figure 5, p. 13 shows the dimensions of the Tracer AH541 enclosure.

12 CNT-SVN02D-EN
Mounting the enclosure
Figure 4. Minimum clearances for enclosure
24 in. (60 cm)
to fully open door
12 in. (30 cm)
36 in. (90
12 in. (30 cm)
50 in. (130 cm) recommended
12 in. (30 cm)

CNT-SVN02D-EN 13
Mounting the enclosure
Figure 5. Tracer AH541 enclosure dimensions
Front
Top
Bottom
Left
Right
Note: Six of the twelve knockouts are dual-sized knockouts for 1-inch (25 mm) and ¾-inch (19 mm)
conduit.

14 CNT-SVN02D-EN
Mounting the enclosure
Mounting the enclosure
To mount the enclosure:
1. Using the enclosure as a template, mark the location of the four mounting holes on the
mounting surface (see Figure 6).
Figure 6. Enclosure mounting holes
BO5
BO4
BO3
BO2
BO1
BO6
24VAC
AO4
AO3
AO6
AO5
AO2
IN3
IN2
IN1
AO1
IN6
IN7
IN5
IN11
IN12
IN10
IN9
IN8
IN4
Mounting hole
(four locations)
2. Set the enclosure aside and drill holes for the screws at the marked locations.
Drill holes for #10 (5 mm) screws or #10 wall anchors. Use wall anchors if the mounting surface
is dry wall or masonry.
3. Insert wall anchors if needed.
4. Secure the enclosure to the mounting surface with the supplied
#10 (5 mm) screws.

CNT-SVN02D-EN 15
Wiring high-voltage ac power
Wiring high-voltage ac power
This section shows how to wire high-voltage ac power to the enclosure.
Local power requirements
The Tracer AH541 controller is available in five configurations, described in Table 3. Before wiring
high-voltage power, make sure that you have the correct model for local power requirements. You
can find the model number on the shipping label or on the product label inside the enclosure.
Table 3. Tracer AH541 models
Model Number Description
BMTA000AAC00 Enclosure, 120 Vac
BMTA000AAC01 Enclosure, 120 Vac, with operator display
BMTA000BAC00 Enclosure, 230 Vac, CE-compliant
BMTA000BAC01 Enclosure, 230 Vac, with operator display, 
CE-compliant
BMTA000CAA00 Frame-mounted, 24 Vac, CE-compliant
Circuit requirements
To ensure proper operation of the Tracer AH541, install the power supply circuit in accordance with
the following guidelines:
• The Tracer AH541 must receive high-voltage power from a dedicated power circuit. Failure to
comply may cause control malfunctions.
•A disconnect switch for the dedicated power circuit must be near the controller, within easy
reach of the operator, and marked as the disconnecting device for the controller.
• High-voltage power-wire conduits or wire bundles must not contain input/output wires nor the
operator display cable connected to conroller. Failure to comply may cause the controller to
malfunction due to electrical noise.
• High-voltage power wiring must comply with the National Electrical Code (NEC) and applicable
local electrical codes.
• High-voltage power wiring requires three-wire 120/230 Vac service (line, neutral, ground). Use
copper conductors only.
Note: The voltage utilization range for the Tracer AH541 transformer is 98–132 Vac (120 Vac
nominal) or 196–264 Vac (230 Vac nominal). The panel detects whether the current is 50 or
60 cycle.
Wiring high-voltage power
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.

NOTICE:
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of conductors. Failure to use copper
conductors could result in equipment damage. (#C 7)
16 CNT-SVN02D-EN
Wiring high-voltage ac power
Important: Make sure that you have the correct Tracer AH541 model for 120 Vac or 230 Vac.
Table 3, p. 15 lists the available models.
To connect high-voltage power wires:
1. Lock open the supply-power disconnect switch.
2. At the top right corner of the enclosure, remove the knockout and install ½-inch (13 mm) conduit
(see Figure 7).
Figure 7. Knockout for high-voltage power wires
Power wire entry through
knockout for ½-inch conduit
3. Open or remove the Tracer AH541 door if it is already installed (see “Installing the door,” p. 43).
4. Inside of the enclosure at the top-right corner, remove the high-voltage area cover plate.
5. Feed the high-voltage power wires into the enclosure.
6. Connect the line wire to the L terminal as shown in Figure 8.

CNT-SVN02D-EN 17
Wiring high-voltage ac power
Figure 8. Terminal block for high-voltage power wires
Ground wire to
ground screw
Line wire to 
L terminal
Neutral wire to 
N terminal
7. Connect the neutral wire to the N terminal.
8. Connect the green ground wire to the chassis ground screw. The ground wire should be
continuous back to the circuit-breaker panel.
9. Replace the cover plate.
WARNING
Hazardous Voltage!
The cover plate must be in place when the controller is operating. Failure to replace the cover
plate could result in death or serious injury.
10. On a label, record the location of the circuit-breaker panel and the electrical circuit. Attach the
label to the cover plate.

18 CNT-SVN02D-EN
Installing the pressure sensor
This section shows how to install a pressure sensor in the Tracer AH541 controller. The pressure
sensor available for the Tracer AH541 is a 5 Vdc, 0–5 inches water column, differential pressure
sensor. To simplify installation of the pressure sensor, mount and wire it before wiring the other
inputs and outputs.
Important: When configured for variable-air-volume control, the Tracer AH541 controller must
receive a valid duct static-pressure value to operate properly. The duct static-
pressure value may be communicated over the Comm5 network or wired directly to
the controller.
The controller does not require a duct static-pressure value for constant-volume space-
temperature control or constant-volume discharge-air temperature control.
Installation process
Important: Use only pressure sensors with non-conductive plastic cases with the Tracer AH541
controller. Pressure sensors with conductive plastic cases may generate incorrect
data. To ensure proper results, order the Trane pressure-differential 5 Vdc sensor kit
(part number 4020 1159).
To mount the pressure sensor in the Tracer AH541 enclosure:
1. Open the enclosure door.
2. Use the supplied #6 (3.5 mm) mounting screws to mount the pressure sensor to the mounting
holes shown in Figure 9.
Figure 9. Mounting the pressure sensor
BO5
BO4
BO3
BO2
BO1
BO6
24VAC
AO4
AO3
AO6
AO5
AO2
IN3
IN2
IN1
AO1
IN6
IN7
IN5
IN11
IN12
IN10
IN9
IN8
IN4
Pressure sensor
mounting holes
3. Connect the pressure-sensor cable to the duct static connector on the termination board as
shown in Figure 10.
The duct static connector is keyed. If you have difficulty connecting the cable, rotate it 180° and
try again.
4. Run the high and low input tubes to an appropriate place in the duct.

CNT-SVN02D-EN 19
Installing the pressure sensor
Figure 10. Wiring the pressure sensor
BO5
BO4
BO3
BO2
BO1
BO6
24VAC
AO4
AO3
AO6
AO5
AO2
IN3
IN2
IN1
AO1
IN6
IN7
IN5
IN11
IN12
IN10
IN9
IN8
IN4
Duct static connector
Checking the pressure sensor
You can check the pressure sensor for proper operation only after supplying power to the controller
and installing the main circuit board. You will need a digital multi-meter to complete the check.
To check the pressure sensor for proper operation:
1. Make sure that the main circuit board has been installed and power has been provided to the
controller.
2. Make sure that the pressure-sensor is connected to the duct static input on the termination
board.
3. Set the digital multi-meter to measure dc voltage.
4. Connect the multi-meter to the input as shown in Figure 11 and discussed in table Table 4.

20 CNT-SVN02D-EN
Installing the pressure sensor
Figure 11. Connecting the multi-meter
Duct static connector
on termination board
Green
Black
Red
to the duct static input
5. Make sure that the multi-meter readings fall within the ranges shown in Table 4. If a reading is
not within the expected range, check for faulty connections or a faulty pressure sensor
Table 4. Expected voltages for the pressure sensor input
Multi-meter (–) lead at Multi-meter (+) lead at Measured dc voltage
Green (ground) Red (in) 4.8–5.2 Vdc
Green (ground) Black (out) 0.24–5.42 Vdc
.
For additional troubleshooting information, refer to the Tracer AH540 user guide, CNT-SVX05B-EN.