TSI Instruments FHC50 Operation manual

FUME HOOD
CONTROLLER/MONITOR
MODEL FHC50/FHM10
OPERATION AND SERVICE MANUAL
P/N 6003830, REVISION G
MARCH 2016

FUME HOOD
CONTROLLER/MONITOR
MODEL FHC50/FHM10
OPERATION AND SERVICE MANUAL
P/N 6003830, REVISION G
MARCH 2016
U.S. AND CANADA OTHER COUNTRIES
Sales & Customer Service: Sales & Customer Service:
[phone]/[phone] (001 651) 490-2811
Fax: Fax:
[phone] (001 651) 490-3824
SHIP/MAIL TO: E-MAIL
TSI Incorporated [email protected]
ATTN: Customer Service
500 Cardigan Road WEB SITE
Shoreview, MN 55126 www.tsi.com
USA

i
Copyright TSI Incorporated / 2010-2016 / All rights reserved.
Part number 6003830/ Revision G / March 2016
LIMITATION OF WARRANTY AND LIABILITY (effective February 2015)
(For country-specific terms and conditions outside of the USA, please visit www.tsi.com.)
Seller warrants the goods, excluding software, sold hereunder, under normal use and service as described in the
operator's manual, to be free from defects in workmanship and material for 24 months, or if less, the length of
time specified in the operator's manual, from the date of shipment to the customer. This warranty period is
inclusive of any statutory warranty. This limited warranty is subject to the following exclusions and
exceptions:
a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when
indicated in specifications, are warranted for 90 days from the date of shipment;
b. Pumps are warranted for hours of operation as set forth in product or operator’s manuals;
c. Parts repaired or replaced as a result of repair services are warranted to be free from defects in
workmanship and material, under normal use, for 90 days from the date of shipment;
d. This warranty does not cover calibration requirements, and seller warrants only that the instrument or product
is properly calibrated at the time of its manufacture. Instruments returned for calibration are not covered by
this warranty;
f. This warranty is VOID if the instrument is opened by anyone other than a factoryauthorized service center
with the one exception where requirements set forth in the manual allowan operator to replace consumables
or perform recommended cleaning;
g. This warranty is VOID if the product has been misused, neglected, subjected to accidental or intentional
damage, or is not properly installed, maintained, or cleaned according to the requirements of the manual.
Unless specifically authorized in a separate writing by Seller, Seller makes no warranty with respect to, and
shall have no liability in connection with, goods which are incorporated into other products or equipment, or
which are modified by any person other than Seller.
The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein. NO OTHER
EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY
IS MADE. WITH RESPECT TO SELLER’S BREACH OF THE IMPLIED WARRANTY AGAINST
INFRINGEMENT, SAID WARRANTY IS LIMITED TO CLAIMS OF DIRECT INFRINGEMENT AND EXCLUDES
CLAIMS OF CONTRIBUTORY OR INDUCED INFRINGEMENTS. BUYER’S EXCLUSIVE REMEDY SHALL BE
THE RETURN OF THE PURCHASE PRICE DISCOUNTED FOR REASONABLE WEAR AND TEAR OR AT
SELLER’S OPTION REPLACEMENT OF THE GOODS WITH NON-INFRINGING GOODS.
TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER, AND THE
LIMIT OF SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES CONCERNING THE
GOODS (INCLUDING CLAIMS BASED ON CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY OR
OTHERWISE) SHALL BE THE RETURNOF GOODS TO SELLER AND THE REFUND OF THE PURCHASE
PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR REPLACEMENT OF THE GOODS. IN THE
CASE OF SOFTWARE, SELLER WILL REPAIR OR REPLACE DEFECTIVE SOFTWARE OR IF UNABLE TO
DO SO, WILL REFUND THE PURCHASE PRICE OF THE SOFTWARE. IN NO EVENT SHALL SELLER BE
LIABLE FOR LOST PROFITS, BUSINESS INTERRUPTION, OR ANY SPECIAL, INDIRECT,
CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL NOT BE RESPONSIBLE FOR
INSTALLATION, DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No Action, regardless of form,
may be brought against Seller more than 12 months after a cause of action has accrued. The goods returned
under warranty to Seller's factoryshall be at Buyer's risk of loss, and willbe returned, if at all, at Seller's risk of
loss.
Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY, which
contains the complete and exclusive limited warranty of Seller. This LIMITATION OF WARRANTY AND
LIABILITY may not be amended, modified or its terms waived, except bywriting signed by an Officer of Seller.
SERVICE POLICY
Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers, our
service policy is designed to give prompt attention to any problems. If any malfunction is discovered, please
contact your nearest sales office or representative, or call TSI's Customer Service department at (800) 874-
2811 or [phone].

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TRADEMARKS
TSI, TSI logo, VELOCICALC, are registered trademarks of TSI Incorporated.
BACnet is a trademark of ASHRAE.
Modbus is a registered trademark of Modicon, Inc.
LonWorks is a registered trademark of Echelon®Corporation.

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CONTENTS
HOW TO USE THIS MANUAL ......................................................................................................1
Safety Information ................................................................................................1
Description of Caution Symbol..........................................................................1
Access Code.....................................................................................................1
PART ONE.....................................................................................................................................3
User Basics ..........................................................................................................3
The Instrument .....................................................................................................3
Face Velocity.....................................................................................................3
Exhaust Flow.....................................................................................................3
Useful User Information ....................................................................................4
Operator Panel.....................................................................................................4
LED Lights.........................................................................................................4
Display Screen..................................................................................................5
User Soft Keys (Normal Operating Mode)........................................................5
Quick Keys........................................................................................................5
Operator Keys...................................................................................................6
USB Port ...........................................................................................................6
Alarms...................................................................................................................6
Visual Alarm......................................................................................................6
Audible Alarm—EMERGENCY key ..................................................................7
Audible Alarms—All Except Emergency...........................................................7
Before Calling TSI ................................................................................................7
PART TWO.....................................................................................................................................9
Technical Section.................................................................................................9
Software Programming.......................................................................................10
Programming Keys..........................................................................................10
Menu Soft Keys...............................................................................................10
Quick Keys......................................................................................................11
Keystroke Procedure.......................................................................................11
Programming Example....................................................................................12
Hardware Configurations....................................................................................13
Model FHC50 Controller Modes .....................................................................13
Model FHM10 Fume Hood Monitor Modes.....................................................14
Menu and Menu Items........................................................................................15
CONFIGURE MENU.......................................................................................17
SETPOINT/ALARM CONSTRAINTS..............................................................30
INTERFACE MENU ........................................................................................31
NETWORK SETTINGS SUBMENU................................................................31
Calibration ..........................................................................................................49
Face Velocity Calibration ................................................................................49
Sash Position Calibration................................................................................50
Flow Calibration...............................................................................................51
Sash Opening Calibration...............................................................................55
Optimizing Controller Performance....................................................................56
Maintenance and Repair Parts...........................................................................56
System Component Inspection.......................................................................57

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Velocity Sensor Cleaning................................................................................57
Replacement Parts..........................................................................................58
Troubleshooting Section.....................................................................................58
Hardware Test.................................................................................................58
Diagnostics Menu............................................................................................60
Troubleshooting Chart.....................................................................................63
APPENDIX A................................................................................................................................71
Specifications*....................................................................................................71
APPENDIX B................................................................................................................................73
Network Communications ..................................................................................73
Modbus®Communications.................................................................................73
Unique to TSI ..................................................................................................73
Network Points................................................................................................73
N2 Communications Description of Variables...................................................77
Description of Variables..................................................................................77
Variable Map...................................................................................................78
LonWorks®Object..............................................................................................80
Node Object Network Variables......................................................................80
Fume Hood Controller Object Network Variables...........................................80
Description of LON SNVTs .............................................................................82
FHC50 BACnet®MS/TP Protocol Implementation Conformance Statement.....83
BACnet®MS/TP Object Set................................................................................85
APPENDIX C................................................................................................................................89
Wiring Information ..............................................................................................89
Back Panel Wiring...........................................................................................89
APPENDIX D................................................................................................................................97
Access Codes / Password..................................................................................97

1
How to Use This Manual
The Operation and Service Manual describes how to operate, configure, calibrate, maintain and
troubleshoot the Model FHM10 Fume Hood Monitor and Model FHC50 Fume Hood Controller.
The manual is divided into two parts. Part one describes the unit and how to interface with the
device. This section should be read by users, facilities staff, and anyone who requires a basic
understanding of how the device operates.
Part two describes the technical aspects of the product which include operation, configuration,
calibration, maintenance and troubleshooting. Part two should be read by personnel
programming or maintaining the unit. TSI recommends thoroughly reading this manual
before changing any software items.
NOTE: This operation and service manual assumes that the controller has been properly
installed. Refer to the Installation Instructions if there is any question as to whether the
controller has been installed properly.
Safety Information
This section gives instructions to promote safe and proper handling of Model FHM10 Fume Hood
Monitors and Model FHC50 Fume Hood Controllers.
There are no user-serviceable parts inside the instrument. Opening the instrument case will void
the warranty. Refer all service of the unit to a qualified technician.
Description of Caution Symbol
C a u t i o n
Caution indicates:
Equipment may be damaged if procedures are not followed.
Improper settings may result in loss of containment.
Important information about unit operation.
Access Code
Model FHM10 Fume Hood Monitors and FHC50 Fume Hood Controllers have an access code to
limit unauthorized access to the menu system. The access code can be turned on or off through
the ACCESS CODE menu item. When the units ship from TSI, they are configured with the
access code on. Refer to Appendix D, Access Codes, for instructions on entering the access
code. Entering the access code enables access to the menu system for a 15-minute period.

2
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User Basics
3
Part One
User Basics
This section is designed to provide a brief but thorough overview of the product installed. These
few pages explain the purpose (The Instrument) and the operation (Useful user information,
Operator panel, Alarms) of the product. Technical product information is available in Part Two of
the manual.
The Instrument
The Model FHM10 Fume Hood Monitor is able to measure and report air flow in fume hoods and
other exhaust devices such as snorkels and canopies. The Model FHC50 Fume Hood Controller
adds the ability to control airflow to maintain safety and energy efficiency.
There are two main monitor and control strategies that can be used with the Model FHC50 Fume
Hood Controller:
Face Velocity
One of the key components of air flow in a fume hood is adequate face velocity, which is needed
to protect fume hood users. An adequate face velocity will help contain contaminants inside of
the fume hood.
A fume hood exhaust system produces a negative pressure differential between the fume hood’s
interior and the laboratory, causing air to be drawn into the hood. The speed of air entering the
fume hood is called the face velocity. The Model FHC50 Fume Hood Controller can be
configured to continuously monitor fume hood face velocity by measuring the air velocity across a
sensor mounted in the sidewall of the hood. The sensor and opening in the fume hood are driven
by the same pressure differential so the velocity across each is related.
As an alternative to this sidewall sensing methodology, the Model FHC50 can determine average
fume hood face velocity by measuring the fume hood exhaust flow and sash area. When
measuring face velocity in this fashion, the Model FHC50 must use a venturi valve with feedback
to control and measure the exhaust volume. A sash sensor then measures the vertical opening of
the fume hood sash. As an option, the Model FHC50 can use a sidewall sensor to monitor or trim
the face velocity when calculated from sash position and exhaust flow rate.
The Model FHC50 controller modulates the exhaust to maintain an adequate face velocity at all
times through the fume hood.
Exhaust Flow
Certain devices such as laminar flow benches, canopy hoods and snorkels need to exhaust a
certain amount of air to function properly. For these applications, the Model FHC50 can be
configured to measure and control the air flow to a constant volume using a venturi valve or a
flow station with damper.

Part One
4
Useful User Information
The controller has a green light (normal operation) and red alarm light (low and high alarms). The
green light is on when the face velocity and/or exhaust flow is adequate. The red alarm light
comes on when the face velocity and/or exhaust flow drops below a safe level, or exceeds a safe
level. The display provides additional information depending on the configuration of the unit.
Some of the available information includes continuously indicating the actual face velocity,
exhaust flow, alarms, and controller status.
Operator Panel
The Model FHM10 Fume Hood Monitor
and Model FHC50 Fume Hood Controller
are easy to use. All the information you
need to know about face velocity and
flow rates is displayed on the Display
Interface Module (DIM). In addition, all
configuration, control, and calibration
programming is accessible using the soft
keys and menus. Specific details about
the Model FHC50controller front panel
display and controls are described on the
following pages. The front panel, shown
in Figure 1 identifies the important
features: display, keys and lights.
LED Lights
Green Light
The green light (NORMAL) is on
when the face velocity and/or
exhaust flow is adequate. This light
indicates the fume hood is operating
safely. If a set point cannot be
maintained or an alarm limit has
been reached, the green light turns
off and the red alarm light turns on.
Figure 1
Yellow Light
The yellow light is on to indicate that the Model FHC50 controller is muted or in setback
mode. The LCD display will read “Setback” or “Mute” at the top of the screen to indicate the
meaning of the yellow light. Note that when in Setback mode, the Model FHC50 will also turn
on the Red or Green light.
Red Light
The red light is on to indicate an alarm or emergency status. If the red light flashes, then the
Model FHC50 is in emergency mode. If the red light is continually lit, then the Model FHC50
is in an alarm mode. The display screen will also indicate the type of alarm or an emergency
message.

User Basics
5
Display Screen
The LCD display is highly configurable and can display various critical information including
actual face velocity, exhaust flow rate, alarm status, menu options, and error messages. In
addition, the LCD display shows various soft key labels that enable user interaction and
programming the unit.
When programming the unit, the display will update soft keys and show menus, menu items, and
current value of the menu item, depending on the specific programming function being
performed.
User Soft Keys (Normal Operating Mode)
There are four soft keys on the front of the unit just below the LCD screen that can be used to
interact with the unit.
WARNING
Pressing these keys will change how the unit functions. Please thoroughly review the
manual before using these keys or changing menu items.
NOTE: The unit can be programmed so that the User Soft Keys will not be displayed
during normal operating mode (see Software Programming section, menu
item DISPL SOFTKEYS).
The list below contains soft keys that will appear at the display screen during normal operating
mode, depending on the state of the unit.
MENU
Provides access to the menus when in the normal operating mode (see
Software Programming section).
RESET
Resets the alarm light, alarm contacts, and audible alarm when in a latched
or non-automatic reset mode. If an alarm is reset before alarm conditions
exited, the monitor or controller will reset the alarm but the alarm mode will be
re-entered after the ALARM DELAY.
Resets the emergency function after the emergency key has been pressed
(see EMERGENCY key).
Clears any displayed error messages.
SETBACK
The SETBACK soft key activates the setback or second control set point. In
setback mode, the controller controls at the setback set point, the display
indicates SETBACK, and the yellow light turns on.
NORMAL
The NORMAL soft key will appear if the unit has been placed into Setback
mode. If the NORMAL soft key is pressed, the controller returns to normal
control set point.
Quick Keys
There are two Quick Keys on the front of the unit just below the Soft Keys. The Quick-Keys
function as left and right arrows or to increase/decrease values.

Part One
6
Operator Keys
There are two dedicated keys on the front of the unit that each provides a critical function.
MUTE key
The MUTE key silences an audible alarm. The alarm remains silent until the
MUTE TIMEOUT value has been reached or the unit returns to control set point.
Pressing the MUTE key twice will permanently mute the alarm.
NOTE You can program the unit so that the audible alarm cannot be muted
(see menu item MUTE_BUTTON).
EMERGENCY key
The EMERGENCY key puts the controller into emergency mode. The controller
maximizes the exhaust flow and face velocity (if applicable) by modulating the
damper or venturi valve to full open position.
Pressing the EMERGENCY key will cause ”EMERGENCY” to appear on the
display, the red alarm light to flash on and off, and the audible alarm to beep
intermittently. To return to control mode press the EMERGENCY key or the
RESET key.
The Model FHM10 monitor and FHC50 controller can be configured so the
audible alarm is silenced during emergency mode. See menu item
EMERGENCY_AUD.
USB Port
There is a USB port at the bottom of the case. This USB port can be used with TSI’s Fume Hood
Configuration Software.
Alarms
The Model FHC50 controller has visual (red light) and audible alarms to inform you of changing
fume hood conditions. The alarm levels (set points) are determined by facilities staff, which could
be Engineering, Industrial Hygiene, or a facilities group depending on how the safety staff is
organized.
The alarms, audible and visual, will activate whenever the preset alarm level is reached. The
alarms will activate if the face velocity is low or inadequate, high or too great, or when the
exhaust airflow is too low or too high (need optional flow device installed). When the fume hood is
operating safely, no alarms will sound.
Example: The low alarm is preset to activate when the face velocity falls below 60 ft/min. When
the face velocity drops below 60 ft/min, the audible and visual alarms activate. The
alarms turn off (when set to unlatched) when the unit returns to the safe range, which
is defined as 20 ft/min greater than alarm set point (80 ft/min).
Visual Alarm
The red light on the front of the unit indicates an alarm condition. The red light is on for all alarm
conditions, low alarms, high alarms, and emergency. The light is on continuously in a low or high
alarm condition, and flashes in an emergency condition.

User Basics
7
Audible Alarm—EMERGENCY key
When the EMERGENCY key is pressed, the audible alarm beeps intermittently until the
EMERGENCY or RESET key is pressed terminating the emergency alarm. Pressing the MUTE
key will silence the emergency alarm, although the red LED will continue to flash (if enabled - see
menu item MUTE_KEY).
The Model FHM10 monitor and FHC50 controller can be configured so the
audible alarm is silenced during emergency mode. See menu item
EMERGENCY_AUD.
Audible Alarms—All Except Emergency
The audible alarm is continuously on in all low and high alarm conditions. The audible alarm can
be silenced by pressing the MUTE key (if enabled - see menu item MUTE_BUTTON).
If the audible alarm has been muted, the alarm is silenced for a configurable period of time (see
menu item MUTE TIMEOUT) or the measurement returns to the safe range. The safe range is 20
ft/min (50 cfm) above the low alarm set point and 20 ft/min (50 cfm) below the high alarm set
point.
The audible and visual alarms can be programmed to either automatically turn off when the unit
returns to the safe range or to stay in alarm until the RESET key is pressed (See menu item
ALARM_RESET).
Before Calling TSI
This manual should answer most questions and resolve most problems you may encounter. If
you need assistance or further explanation, contact your local TSI representative or TSI. TSI is
committed to providing high quality products backed by outstanding service.
Please have the following information available prior to contacting your authorized TSI
Manufacturer’s Representative or TSI:
- Model number of unit* FHC50-____ or FHM10-____
- Software revision level*
- Facility where unit is installed
* Can be determined by entering the SELF TEST item under the Diagnostics menu.
Due to the different Model FHM10 monitors and Model FHC50 controllers available, the above
information is needed to accurately answer your questions.
For the name of your local TSI representative or to talk to TSI service personnel, please call TSI
at [phone] (U.S. and Canada) or (001 651) 490-2811 (other countries).
Prior to shipping any components to TSI for service or repair, please utilize our convenient
Return Material Authorization (RMA) Form, which is available online at http://service.tsi.com.

Part One
8
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Technical Section
9
Part Two
Technical Section
The Fume Hood Controller is ready to use after being properly
installed and calibrated. The calibration procedure should take
less than 15 minutes. Figure 2 shows the Digital Interface Module
(DIM) which is programmed with a default configuration that can
be easily modified to fit your application.
The technical section is separated into six parts that cover all
aspects of the unit. Each section is written as independently as
possible to minimize flipping back and forth through the manual
for an answer.
The Software Programming section explains the programming
keys on the DIM. In addition, the programming sequence is
described, which is the same regardless of the menu item being
changed. At the end of this section is an example of how to
program the DIM.
The Hardware Configurations section covers the different ways
the DIM can be configured to accommodate the hardware and
sequence of operation that is required. This section explains how
to compare the installed hardware to the necessary settings that
are needed.
Figure 2
The Menu and Menu Items section lists all of the software items available to program and
change. The items are grouped by menu which means all set points are in one menu, control
signal items in another, etc. The menu items and all related information is provided including;
programming name, description of menu item, range of programmable values, and how the unit
shipped from the factory (default value).
The Calibration section describes the required procedure to calibrate the controller. This section
explains how to compare the controller’s velocity reading to a portable thermal anemometer and
then adjust the zero and span to establish an accurate calibration. This section also describes
how to zero a TSI flow station transducer (if installed).
The Maintenance and Repair Part section covers all routine maintenance of equipment, along
with a list of repair parts.
The Troubleshooting section is split into two areas: mechanical operation of the unit and system
performance. Many external variables will affect how the unit functions so it is critical to first
determine if the system is having mechanical problems—i.e., no display on unit, alarms do not
function, damper does not modulate, etc. If no mechanical problems exist, look for performance
problems (i.e., does not seem to read correctly, display fluctuates, etc.). The first step is to
determine that the system is mechanically operating correctly, followed by modifying the
configuration to eliminate the performance problems.

Part Two
10
Software Programming
Programming the Model FHC50 controller is quick and easy if the programming keys are
understood, and the proper keystroke procedure is followed. The programming keys are defined
first, followed by the required keystroke procedure. At the end of this section is a programming
example.
NOTE: It is important to note that the unit is always operating (except when checking the
CONTROL OUTPUT) when programming. When a menu item value is changed, the new
value takes effect immediately after saving the change, not when the unit returns to
normal operating mode.
This section covers programming the instrument through the keypad and display. If
programming through network communications (see Appendix B), use the host computer’s
procedure. The changes take place immediately upon saving data in the instrument.
Programming Keys
The four vertical programming soft
keys (refer to Figure 3) are used to
program or configure the unit to fit your
particular application. Programming the
instrument will change how the unit
functions, so thoroughly review the
menu items to be changed.
Figure 3
Menu Soft Keys
The list below contains soft keys that will appear while in the menu structures.
ESC
The ESC soft key is used to escape from the current menu or menu item, and will also
cancel any change that is currently being made to an item value.
/
The /soft keys are used to scroll through the menus, menu items, and through the
range of item values that can be selected. Depending on the item type the values may
be numerical, specific properties (on/off), or a list of options.
NOTE: When programming a numerical menu item, continuously pressing the arrow
key will scroll through the values faster than if arrow key is pressed and
released.

The (ENTER) soft key performs three functions.
1. Provides access to specific menus and submenus.
2. Provides access to menu items.
3. Saves data.

Technical Section
11
Quick Keys
There are two dedicated adjustment keys on the front of the unit (refer to Figure 3) that become
active when accessing a menu item. These keys change choices of a menu item while that item
is highlighted on the display. The left adjustment key will decrease the value of an item, and the
right adjustment key will increase the value of an item. If there are no choices available for a
particular menu item, or if that menu item is for reference only, the adjustment keys will have no
effect.
The item data will be automatically saved when either of the /soft keys are used to highlight
a different menu item, or when the (ENTER) soft key is pressed. Pressing the ESC soft key
while the menu item is still highlighted will discard changes and restore the item to its last saved
value.
NOTE: When programming a numerical menu item, continuously pressing a quick adjustment
key will scroll through the values faster than if they key is repeatedly pressed and
released.
Keystroke Procedure
The keystroke operation is consistent for all menus. The keystroke sequence is the same
regardless of the menu item being changed.
1.Press the MENU soft key from the normal operating screen to access the main menu.
2.Use the /soft keys to scroll through the menu choices until the item you want to
access is highlighted.
3.Press the (ENTER) soft key to access chosen menu.
4.The menu selected is now displayed at the top of the display, followed by a list of available
menu items. Use the /soft keys to scroll through the menu items. Scroll through the
menu items until desired item is highlighted.
Standard Data Entry Method
5a.Press the (ENTER) soft key to access
chosen menu item. The top line of
display shows menu item selected, and
below that shows current menu item
value. Use the /soft keys to change
menu item value.
Quick Data Entry Method
5b.With the desired menu item highlighted,
use the quick adjustment keys to change
menu item value.
6a. Save the new value by pressing the 
(ENTER) soft key (pressing the ESC soft
key will exit out of menu item without
saving data). The display will
automatically return to the current menu.
6b. Save the new value by pressing the 
(ENTER) soft key OR by using the /
soft keys to highlight a different menu
item (pressing the ESC soft key will exit
out of menu item without saving data).
7.Press the ESC soft key to exit current menu and return to main menu.
8. Press the ESC soft key again to return to normal instrument operation.
If more than one item is to be changed, skip steps 7 and 8 until all changes are complete. If more
items in the same menu are to be changed, scroll to them after saving the data (step 6a or 6b). If
other menus need to be accessed, press the MENU key once to access list of menus (the
instrument is now at step 2 of the keystroke sequence).

Part Two
12
Programming Example
The following example demonstrates the keystroke sequence. In this example the low alarm set
point will be changed from 80 ft/min to 60 ft/min.
Unit is in normal operation.
0ft/min
MENU SETBACK
Press the MENU key to gain access to the
menus.
The first menu choices are displayed.
MENU
ESC
Configure
Setpoints
Interface
Calibration
Control
Diagnostics
Press the and keys to access the SETPOINTS menu.
Press the soft key until Lo Vel Alarm
is highlighted.
SETPOINTS
ESC
100 ft/min
60 ft/min
25%
100%
OFF
Setpoint
Setback
MinControl Pos
MaxControl Pos
Lo Vel Alarm
---- ----
Standard Data Entry Method
Quick Data Entry Method

Press the key to access the
Lo Vel Alarm screen.
LO VEL ALARM
ESC
60 ft/min
Press the Quick-Adjust keys to change
the alarm set point. Then press the or
soft key to save the change.
SETPOINTS
ESC
100 ft/min
60 ft/min
25%
100%
OFF
Setpoint
Setback
MinControl Pos
MaxControl Pos
Lo Vel Alarm
---- ----

Press the /soft keys to change the alarm set point to 60 fpm, then press the
key to save the new set point.