Hussmann Safe-NET User manual

INTRODUCTION
WHAT IS Safe-NET™
Safe-NET is an advanced, electronic system for monitoring or control-
ling case temperatures in one or more locations. It will help you ensure
continuous, reliable refrigeration and safer, fresher foods, 24 hours a
day.
The Safe-NET system is composed of sensors, harnesses,
control modules, display modules, relay modules and a power supply.
Safe-NET technology provides an ideal system for verifying and main-
taining compliance with Federal Department of Agriculture (FDA)
and National Sanitation Foundation (NSF) regulations. It uses a
standard communication protocol compatible with many third party
systems to enable communication with a PC.
Temperature Monitoring
Safe-NET lets you monitor temperatures in up to 10 different areas of
each case: discharge air, return air, product temperatures, coil inlet and
outlet temperatures, etc. Temperature readings are logged for later
review. The system sends an alarm if temperatures exceed predefined
limits.
COMPONENTS
All components of the Safe-NET system (displays, sensors, and control
modules) are factory installed. A single case-to-case plug-in connector
is all that is required for field installation.
Display Module
The display module is a slim four-digit binary coded decimal LED unit
which mounts in the case fascia panel. It lets you check temperatures at
a glance and performs a variety of other monitoring and control
functions via push-buttons or the hand-held controller.
Up to 10 sensors can be connected to each display module.
Digital Sensors
Up to 10 digital sensors can be installed in each case with a single
cable connection. There are 14 types of sensors. Each sensor has an
electronic identifier so it can be recognized by the display module.
This eliminates the need for separate wiring. Sensors in each case are
harnessed together to a single wire leading to the display module.
Sensors are designed for rugged durability. Should a sensor fail, it
can be replaced.
Optional Wireless Hand-held Controller and/or PC Control
The wireless controller communicates with the display unit through
an infrared sensor. This allows setups and queries which can also be
performed via PC over the network.
If the wireless controller is not available, it is possible to program the
controller directly with buttons located on the display module.
Solid State Relay Board
A solid state relay board will have multiple (4, 3 or 2) relays.
Real Time Clock
The real time clock (RTC) is an option available to the Safe-NET
control. Normally, the clock is manually set upon case startup. If
power is lost (for any period of time up to 10 days), the RTC will
provide real time to the Safe-NET control upon restoration of power.
SELF-CONTAINED CASE
Safe-NET components are factory-installed. Once power is supplied to
the case as specified in the case’s installation and service manual,
Safe-NET settings are ready to be selected.
Settings are retained when power is interrupted. Thus, a self-contained
case can be moved without re-entering selected settings.
Startup of a new Self-Contained case is quite simple:
1. Verify case type selected.
2. Set the clock.
3. Check or set the temperature set-point.
Safe-NET™ Self-Contained Operating Instruction Page 1 of 8 — P/N 0485005_B
www.hussmann.com/cstore/c_techinfo.htm © 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.
20 June 2007
Alarm Module
Sensor
Harness
Temperature Sensor
Power Supply
(Transformer)
Display Module
ARV / ARL
Kit Alarm
Typical Safe-NET™ Installation
Typical Safe-NET™ Display Module
Typical Safe-NET™ Sensor Harness
Typical Safe-NET™ Hand-Held Controller
Typical Safe-NET™ Power Supply
Typical Safe-NET™ Power Relay
Typical Safe-NET™ Real Time Clock
Typical Safe-NET™ Relay Module

THREE BUTTON RULES
• Always start by pushing the SELECT button, watch what is
displayed. Which menu are you in?
— StUP — CLOC — DEFr — tEM — VALv — DiSP —
and cycles back to StUP
• Press the SELECT button until you are in the proper menu. Once in
the proper menu press the UP or DOWN button to enter the menu and
to scroll through the menu.
• Once at the menu item that you want, press the SELECT button until
the item flashes between the value and the title. You may have to press
the SELECT button more than once to get the item to flash.
• Then press the UP or DOWN button to change the item.
• Remember to push the SELECT button to save the item.
Also remember to set the passcode before any items can be changed.
• Pressing the UP or DOWN buttons at the same time acts as an escape
to go back out of the menus.
Safe-NET™DISPLAY & ALARM MODULES
DESCRIPTION
Safe-NET Display Module
The Safe-NET Display Module, shown below, is a temperature-
monitoring device.The display module reads and displays temperature
sensed by the product simulator temperature sensor mounted in the
refrigerated space.The display module notifies the user of alarms based
on preset alarm conditions.
OPERATION
Normal
During normal operating conditions, the product simulator tempera-
ture is displayed.The GREEN LED on the alarm module is lighted .
Product Temperature Alarms
The display module generates an alarm if the product simulator
temperature rises above the high alarm set point or drops below the
low alarm set point for the preset time duration.
When the display module generates a high temperature alarm, the
RED LED on the display module is lighted. Every 12 seconds, PrHi is
displayed for 3 seconds; for the remaining time, the product simulator
temperature is displayed.
When the display module generates a low temperature alarm, the
RED LED on the display module is lighted. Every 12 seconds, PrLo is
displayed for 3 seconds; for the remaining time, the product simulator
temperature is displayed.
For either alarm, the beeper on the alarm board beeps every 6 seconds.
Power Failure
If external power to the unit is interrupted, the backup battery on the
alarm board supplies power to maintain the non-volatile memory in
the display module.
To conserve power, the display LEDs are blanked except for a period of
6 seconds every 3 minutes when product temperature is displayed.
Product temperature alarms can be generated during external power
loss.The audible alarm is active only for product temperature alarms.
Low Battery
During normal operating conditions, the alarm module monitors
battery condition.The display shows bAtt when the battery becomes
low on power and the beeper on the alarm board beeps every 2 minutes
to indicate a low battery condition. The low battery audible alarm is
active only when external power is applied.
Connection Failure
Loss of communication between the display module and the alarm
module activates an alarm. When the display module generates a loss of
communication alarm, the RED LED on the display module is lighted.
Every 12 seconds, A-Er is displayed for 3 seconds; for the remaining
time, the product simulator temperature is displayed. The beeper on
alarm board beeps every 30 seconds. The A-Er audible alarm is active
only when external power is applied.
Precedence of Alarms
Severity of the alarm determines the beeper action. The following table
shows the priority of the alarms.
An alarm with higher severity takes precedence over a low severity
alarm. For example, if there is a product alarm and low battery alarm:
• The alarm board beeper beeps every 6 seconds to indicate the
product temperature alarm.
• Indication of the low battery alarm is ignored by the beeper, but
is active in the display.
• Every 12 seconds, the display shows PrHi for 3 seconds followed
by bAtt for 3 seconds. For the remaining time, product simulator
temperature is displayed.
Alarm Set Points
Refer to the manual that came with the specific case or model.
Notes:
• A high temperature alarm typically activates during case startup.
This is normal since the refrigerated space requires an extended period
to reach operating temperature. Product must not be loaded until
operating temperature is reached. Premature stocking may result in
product loss.
• Battery backup operation is possible for up to 6 hours.The initial
condition of the battery determines the length of time. Operation of
Safe-NET is compromised once the battery runs low. Product integrity
cannot be ensured until power is restored and the battery is replaced.
MODIFYING SETTINGS
The Safe-NET display module stores alarm set points and alarm delay
times for monitoring cases. The suggested default set points may be
modified.
Use a flat, narrow tool such as a small screwdriver to remove the cover
of the display module.
IMPORTANT!
•Hussmann recommends against changing any parameter
value other than those described herein. Modification of
any other parameter may result in unpredictable Safe-NET
operation.
• The user must monitor each case after altering product
alarm set points and/or product alarm time delays to verify
proper operation.
There are three visible buttons on the left hand side of the display
board,as indicated in Figure 2 on Page 1. Although labels are not
clear, buttons can be determined by their location.
The SELECT button is located near the top edge of the display board.
It is used to select the menus and to edit the menus.
The UP button is the left button of the two buttons located on the
bottom lineup of the display board. The DOWN is the right button of
the two buttons located on the bottom lineup of the display board.
The UP and DOWN buttons are used to move within and between
menus, and to increment or decrement values.
Safe-NET™ Self-contained Operating Instruction Page 2 of 8 — P/N 0485005_B
© 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A. www.hussmann.com/cstore/c_techinfo.htm
20 June 2007
Safe-NET Display Module with Top Cover
LED Indicators
Safe-NET Display Module with Cover Removed
Safe-NET Alarm Module
Green LED
SELECT Button
UP Button DOWN Button
Alarm Display
Action
Beeper
OFF Time
(seconds)
Severity
Product
HIGH/LOW
Alarm
PrHi/PrLo 6 1
Connection
Failure A-Er 30 2
Low Battery bAtt 120 3

Notes:
• The SELECT button is used to scroll through the following menus:
StUP – Setup
CLoC – Clock
dEFr – Defrost
tEM – Temperature
uALu – Valve
diSP – Display Default
• User must enter valid password to edit parameter settings.
• To edit any menu item, press either the UP or DOWN button to
enter the selected menu.
• Use the SELECT button to modify and save the parameter once the
UP or DOWN button is pressed.
• The display cycles between menu item and edited menu value once
the edited value is entered using the SELECT button, .
• The display returns to showing the product simulator temperature
if no button is pressed for 12 seconds once the menu is displayed. User
must scroll through the menus using the SELECT button to return to
the SETUP menu.
• Holding a button down has the same effect as pressing once.
PASSWORD
Entering the password is done in the SETUP menu.At the top of the
SETUP menu, press the UP button.The display will begin to cycle
between PASS and 0.
While 0 is being displayed, press the SELECT button to allow editing
of the value. With the Safe-NET display module flashing 0, use the UP
/DOWN buttons to increment or decrement the value until it reaches
595. 595 is the password value.
Once 595 is displayed, press the SELECT button. The display will
revert to cycling between PASS and 595. This enables editing of
parameters.
The user may now navigate the menu system and edit parameters as
necessary.
Note:
The password protected access remains active for 5 minutes. Each time a
new parameter is entered by pressing the ENTER key on the Hand-Held
device or the SELECT button on the Safe-NET display module, the
5 minute timer is restarted. After 5 minutes with no parameter entries,
the password value reverts to 0 and the password entry process must be
performed to regain access to critical parameters. The SETUP menu can
be navigated without a valid password in a “view only” mode.
MODIFYING SET POINTS
With the password active and the display reading product temperature,
use the SELECT button to scroll through the menus. Once the display
reaches the StuP menu, use the UP button until the display shows the
parameter to be modified:
• To change the product low alarm set point, press the UP button
until the display cycles between PrLo and the current product low
alarm set point.
• To change the product high alarm set point, press the UP button
until the display cycles between PrHi and the current product high
alarm set point.
• To change the product alarm delay, press the UP button until
display cycles between P-dL and the current product alarm delay.
Once the desired menu item is displayed, press SELECT button. The
display cycles between the corresponding menu item and theVALUE.
Press the UP button to increment the value or the DOWN button to
decrement the value.
When the entered value begins flashing, press the SELECT button to
store the new value.The display cycles between the new value and the
menu item. Within 12 seconds after button activation, the display
starts showing the product temperature.
ALARMS
A red LED on the board turns on during alarm. The display will show
a four-character word for about 3 seconds alternating with a blank
display for 9 seconds. Following are details of alarms applicable to
self-contained cases.
Alarm with Sensor Number –“SEnS”
This alarm is generated when the control is initialized, and indicates
that the number of sensors entered in the control is different from the
number of sensors connected to the control.This Alarm can be cleared
only by changing the reading for number of sensors to 0 and resetting
the display module which then updates the reading to the number of
sensors connected. This is caused by the control not being set up
correctly or by a sensor having failed.
Alarm with Sensor reading –“noSn”
This alarm is generated when the display module is unable to read the
sensors for five consecutive seconds. This alarm clears automatically
when the control is able to read the sensors. This may be caused by a
sensor being disconnected or shorted. This alarm clears automatically
when the control is able to read the sensors.
Discharge Air High Alarm –“dSHi”
This alarm is generated when the average discharge air temperature in
the case, over the programmed alarm delay time, is higher than the
High Alarm value stored in the control.This alarm will clear if the
average discharge air temperature goes below the High alarm value.
THIS ALARM IS AVAILABLE ONLY IF DISCHARGE SENSORS ARE INSTALLED.
Discharge Air Low Alarm –“dSLo”
This alarm is generated when the average discharge air temperature in
the case, over the programmed alarm delay time, is lower than the Low
Alarm value stored in the control. This alarm will reset if the average
discharge air temperature goes higher than Low alarm value.
THIS ALARM IS AVAILABLE ONLY IF DISCHARGE SENSORS ARE INSTALLED.
Note: Programmable alarm delay (AdLy) is described in a later
section.
Communication Alarm –“CoM”
If there are no network communication attempts for a period of more
than 30 minutes, the display module sets a communication alarm and
shows it on the display. When the display module itself is controlling
rather than (dSPn) a network, the Display Number in setup must be set
to“nonE”to prevent alarm generation.
Product High TemperatureAlarm –“PrHi”
This alarm will be generated if the product simulator average is above
high alarm set-point for product alarm delay time
THE PRHI AND PRLO ALARMS ARE AVAILABLE ONLY IF PRODUCT SENSORS ARE
INSTALLED.
Product Low TemperatureAlarm –“PrLo”
This alarm will be generated if the product simulator average is below
low alarm set-point for product alarm delay time.
Door Open Alarm
This alarm will be generated only if the input of the display is con-
nected to a door switch and the input configuration on the display
board is set to“door”. It is generated when the door is kept open for
more than 2 minutes and will be cleared when the door is closed.
The display alternates two words“cLoS”and“door”until the door is
closed.
Door Open
If the doors are left open for more than 5 minutes even after the alarm,
the fans are turned back on.
MENU NAVIGATION OVERVIEW
The presentation of the Safe-NET Menu system and associated button
and key operation vary somewhat according to the currently displayed
menu item and/or action to be performed. Individual menu items,
definition of purpose, associated action and keypad/button behavior
is described in detail in the following sections.
Some actions and behaviors of the Safe-NET Menu system are
consistent throughout.These should be taken into account to avoid
confusion when navigating the Safe-NET Menu system.
TIME OUTS
Password
Once the valid‘595’PASSWORD has been entered, it will remain active
for 5 minutes.A 5 minute timer is restarted each time a new value is
confirmed with the SELECT button on the Safe-NET Display module.
Re-setting the Safe-NET Display module clears the PASSWORD entry
and sets the 5-minute timer to 0. Therefore, if a setting is modified
that requires the Safe-NET Display module to be reset and subsequent
values require modification, the PASSWORD must be re-entered.
Inactivity
Anytime the display is moved from the default display whether a PASS-
WORD has been entered or values and settings are simply being viewed
and not modified, the display will revert to the default display after 10
seconds.This occurs if no key is pressed on the Hand-Held device or
button on the Safe-NET Display module. If a valid PASSWORD has
been entered, and the display reverts to the default display due to key-
pad and/or button activity, the PASSWORD will remain active for the
remainder of the aforementioned 5-minute timeout period. To resume
modifying values, re-enter the menu of interest while the PASSWORD
is active and continue modifying values.
A modified value will revert to its original value if the value has been
modified but the SELECT button has not been pressed before
simultaneously pressing the UP and DOWN buttons on the Safe-NET
Display module.
BUTTON ACTION
This photo identifies the buttons and the corresponding action on the
Safe-NET Display Module.
Safe-NET™ Self-contained Operating Instruction Page 3 of 8 — P/N 0485005_B
www.hussmann.com/cstore/c_techinfo.htm © 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.
20 June 2007
SELECT Button
UP Button
Safe-NET™ Display Module Button Action
DOWN Button

DISPLAY SYMBOL IDENTIFICATION
(A larger version is on Page 8.)
TOP LEVEL MENUS
By using the SELECT button on the Safe-NET display module, the
seven top-level menus can be sequentially accessed.
The seven top-level menus, submenus, actions and definitions are
discussed in detail in the following sections.
SELECT Button Action
The SELECT button on the Safe-NET display module performs two
functions as follows:
1. When the‘Default Display’is shown on the Safe-NET display, the
SELECT button navigates through the top-level menus in sequence.
Each consecutive press of the SELECT button will advance to the next
top-level menu.
After initial power-up or following a unit reset, navigation begins at
‘dSEt’(set-point), then‘SETUP’and advances in accordance with the
pattern outlined below.
If the unit reverts to the default display due to either an inactivity
time-out or use of the escape button sequence, pressing the SELECT
button will advance to the next top-level menu in sequence as shown
above.
Once a top-level menu is displayed, the first sub menu item and its
associated value will be displayed after 1 second.
Pressing the SELECT button will move to the next top-level menu in
sequence and the submenu/value cycling will repeat for the new top-
level menu.
2. After using the SELECT button to navigate to the desired top-level
menu, pressing the UP or DOWN button will enter the associated
submenu. If no PASSWORD was previously entered, submenu items
are view-only. If a valid PASSWORD was entered prior to entering the
submenu, editing the submenu items will be allowed as described in
the following sections.
After a submenu has been entered with the UP or DOWN buttons, the
SELECT button functions as an enter key to select submenu items for
modification and to confirm new submenu item values after modifica-
tion via the UP or DOWN buttons.
After a submenu has been entered using the UP or DOWN buttons, the
UP/DOWN buttons become activated to navigate the submenu and to
modify submenu item values when the value of interest is selected by
pressing the SELECT key.
The SELECT / ENTER button will continue functioning as an
ENTER button until a reset occurs, a power up/down sequence occurs,
or an escape sequence is executed. Once any of the aforementioned
occurs, the SELECT button reverts to its original function of
navigating top-level menus.
SETUP MENU
The SETUP menu is used to configure operating parameters of the
Safe-NET system. Enter the SETUP menu by pressing the SELECT
button on the Safe-NET Display module. Once the SETUP menu is
entered, use the UP and DOWN arrows on the Hand-Held device or
the UP and DOWN buttons on the Safe-NET Display module to navi-
gate the SETUP sub-menu. The menu navigates in a circular fashion;
i.e., when the last menu item is displayed, pressing the DOWN arrow
or button will cycle back to the top of the menu. Conversely, pressing
the UP arrow or button when the top menu item is displayed will
navigate to the bottom of the menu. To exit the menu, simultaneously
press the UP and DOWN buttons on the Safe-NET Display module.
When a menu item is displayed, the Safe-NET display will cycle
between the menu item and its current value. To edit the value of the
currently displayed menu item, with the value displayed, press the
SELECT button on the Safe-NET display. The value will begin to
flash. Use the UP/DOWN arrows or buttons to increment/decrement
the selected value. Once the desired value is displayed (flashing), press
the SELECT button on the Safe-NET display to save the value. The
Safe-NET display will revert to cycling between the menu item and its
new value.The UP/DOWN arrows or buttons can now be used to
navigate to any other SET UP menu item to be viewed or modified.
After certain parameter changes are completed, the Safe-NET system
must be reset to initiate operation in accordance with the modified
parameter(s). This may be accomplished in one of two ways. Either
navigate to the RESET sub menu item in the SETUP menu and press
the SELECT button on the Safe-NET display, OR cycle power to the
Safe-NET system. Parameter changes requiring a RESET are noted
accordingly in the detailed parameter descriptions.
PASSWORD PROTECTION
Parameters that are critical to proper equipment performance cannot
be modified until a numeric password is entered into the Safe-NET
display module. This prevents accidental or malicious changes in the
Safe-NET system from occurring.
Entering the password is done in the SETUP menu.At the top of the
SETUP menu, press the UP button on the Safe-NET display module.
The display will begin to cycle between PASS and 0.
While 0 is being displayed, press the SELECT button on the Safe-NET
display module to allow editing of the value. With the Safe-NET
display module flashing 0, increment or decrement the value until
it reaches 595. 595 is the password value.
Once 595 is displayed, press the SELECT button on the Safe-NET
display module. The display will revert to cycling between PASS and
595. This enables editing of critical system parameters.
The user may now navigate the menu system and edit parameters as
necessary.
Note:
The password protected access remains active for 5 minutes. Each time
a new parameter is entered by pressing the SELECT button on the
Safe-NET display module, the 5 minute timer is restarted. After 5
minutes with no parameter entries, the password value reverts to 0 and
the password entry process must be performed to regain access to critical
parameters. The SETUP menu can be navigated without a valid password
in a “view only” mode.
DSET
(FIRST OPTION WHEN THE CASE IS TURNED ON.)
The DSET parameter sets the discharge air set point. This set point is
the control point when the Safe-NET system is configured to provide
temperature control of the refrigerated fixture. The configurable range
of the HIGH and LOW alarm set points is centered around this
parameter’s settings.
When the Safe-NET system is applied as a temperature monitoring
device only, this set point has no effect other than limiting the range of
the HIGH and LOW alarm set points.
The display will cycle between DSET and the current set point. While
the set point is being displayed, press the SELECT button on the
Safe-NET display module to allow editing of the value. When the
Safe-NET display module begins flashing the value, use the UP or
DOWN arrow keys on the Hand-Held device or the UP /DOWN
buttons on the Safe-NET display module to increment or decrement
the value to the desired set point.
Once the desired set point is displayed, press the SELECT button on
the Safe-NET display module to store the new value to non-volatile
(NV) memory. The display will revert to cycling between DSET and
the new value.
Note:
The HIGH and LOW alarm settings are limited to +/––16 deg F from
discharge air set point. Setting the discharge air set point will not modify
the current alarm settings. They must be set independently to ensure
proper alarming.
The discharge air set point has a range of ––55 to +170 deg F.
Proper performance is not guaranteed outside ––40 to +50 deg F.
The Safe-NET system must be RESET for the new value to take effect .
DSET may be selected as the default display item for the Safe-NET
display module.
PSEN
The PSEN option enables / disables password protection for the DSET
parameter and allows the TOD clock to be set. This may be desirable
when employees or service personnel must have the option of changing
the operating set point of the refrigerated fixture. While PSEN allows
easy modification of the operating set point and TOD clock, no other
operational settings can be modified without entering a password.
Setting this parameter is done in the SETUP menu. After navigating to
the PSEN sub menu item, the display will cycle between PSEN and the
current setting. While the setting is being displayed, press ENTER on
the Hand-Held device or press the SELECT button on the Safe-NET
display module to allow editing of the value. When the Safe-NET
display module begins flashing the value, use the UP or DOWN arrow
keys on the Hand-Held device or the UP /DOWN buttons on the
Safe-NET display module to step through the selections.
Safe-NET™ Self-contained Operating Instruction Page 4 of 8 — P/N 0485005_B
© 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A. www.hussmann.com/cstore/c_techinfo.htm
20 June 2007
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Once the desired setting is displayed, press the SELECT button on the
Safe-NET display module to store the new value to NV memory. The
display will revert to cycling between PSEN and the new value.
Note:
Factory default is NO to disable password protection for CLOCK and
DSET.
CNTN
The CNTN parameter sets the network address of the Safe-NET
control module to which Safe-NET display modules, or the master
network are connected. This setting has no effect when the Safe-NET
system:
is applied as a temperature-monitoring device only; or,
does not require the Safe-NET control module; or,
is in a non-networked installation.
DSPN
The DSPN parameter sets the network address of the Safe-NET
display module. When the Safe-NET system applied does not require
the Safe-NET control module or is in a non-networked installation,
this setting has no effect.
NSEN
The NSEN parameter displays the number of temperature sensors
attached to the Safe-NET display module. The Safe-NET display
module scans the sensor network during each reset cycle to locate and
identify the attached sensors. Subsequent to a reset action, the number
of sensors detected is displayed here.The number of sensors is stored
in NV memory and is continuously compared to the number of
responding sensors. In this way failed or additional sensors are
detected.
Setting / viewing this parameter is done in the SETUP menu.After
navigating to the NSEN sub menu item, the display will cycle between
NSEN and the current number of sensors stored in NV memory.
LGHT
This setting assigns one of four possible outputs for control of case
lighting.
The Safe-NET system has an optional Relay Board component that
when attached, allows the Safe-NET display board to control up to
four outputs.The controlled outputs are assigned using the SETUP
MENU. The possible controlled output devices are:
1) Compressor (CMP)
2) Evaporator Fans (FANS)
3) Defrost Heaters (DHTR)
4) Anti-Sweat Heater (ANTI)
The Safe-NET system, by design, supports four control outputs. Since
not all possible controlled items are valid in any given configuration,
the Light control output is assigned to an unused output.
Setting this parameter is done in the SETUP menu. After navigating
to the LGHT sub menu item, the display will cycle between LGHT and
the current setting. While the current value is being displayed, press
the SELECT button on the Safe-NET display module to allow editing
of the value. When the Safe-NET display module begins flashing the
value, use the UP or DOWN arrow keys on the Hand-Held device or
the UP /DOWN buttons on the Safe-NET display module to increment
or decrement the value to the desired output.
DEGR
The DEGR parameter determines the units in which the Safe-NET
display module presents temperature information.The Safe-NET
display module is capable of displaying either degrees Fahrenheit or
degrees Celsius.
DUTY
The Safe-NET system has an optional Relay Board component that
when attached, allows the Safe-NET display board to control up to
four outputs.The possible controlled output devices are:
5) Compressor (CMP)
6) Evaporator Fans (FANS)
7) Defrost Heaters (DHTR)
8) Anti-Sweat Heater (ANTI)
The DUTY parameter determines the percentage of ON time for
control of Anti-Sweat heaters if installed and controlled by the
Safe-NET display module. The control period is 100 seconds.
A range of 0 to 100 is possible, with 0 = OFF CONTINUOUSLY to
100 = CONTINUOUSLY ON. Adjusting this parameter can improve energy
consumption. However, a setting of sufficient ON time is required to
prevent condensation from appearing on the fixture frame.
DIFF
The Safe-NET system is capable of controlling temperature inside the
refrigerated space of a refrigerated merchandiser. The Safe-NET system
can achieve this control in the various ways discussed earlier. When
ON/OFF control is selected, the control methodology makes use of a
set point and a control band known as a differential (DIFF). For
example: with a DIFF setting of 10, and DSET set point of 10 deg F,
the ON/OFF control method will attempt to maintain the 10ºby
cycling the control device ON at temperatures above 10ºand OFF
at 0º. This temperature control is superceded by a fixed minimum ON
time of 3 minutes. Hence lower DIFF settings will result in tighter
temperature control but more frequent control device (compressor,
valve) cycling. Conversely, higher DIFF settings will reduce control
device cycling at the expense of product integrity. Typically, this
setting is at user discretion.
FSET
The Safe-NET system is capable of controlling defrost activity and
scheduling. When the Safe-NET system is configured to control
evaporator fans during defrost, this setting provides a temperature set
point to resume evaporator fan operation after defrost cycle termina-
tion. This provides a means to delay activation of the evaporator fans
until the specified coil temperature is reached.This setting works in
conjunction with the FCTL menu option in the DEFROST MENU.
If FCTL (Fan Control) is disabled, this setting has no effect.
CTRL
The Safe-NET system is capable of controlling temperature inside the
refrigerated space of a refrigerated merchandiser. The Safe-NET system
can achieve this control in the various ways discussed earlier.
This parameter selects the temperature input to use in controlling the
temperature of the refrigerated space. Alarms and control set points
are applied to this temperature input source.Available sources are:
PrAv •Product Simulator Average
dSAv •Discharge Air Average
rtAv •Return Air Average
tnLo •Coil Temperature
PD-L
The PD-L parameter sets the alarm delay in minutes for the product
temperature simulator temperature. In the event that the sensed
temperature of the product simulator exceeds the pre-set high
temperature alarm setting for the product simulator temperature
for a period equal to or greater than the PD-L setting, the alarm is
signaled. This is true for low temperature alarms as well. There is only
one time delay associated with all product simulator temperature
alarms.
PRHI
The PRHI parameter sets the high temperature alarm set point for the
product simulator temperature. This set point and associated alarm is
valid for the Safe-NET system when applied as a Monitoring or
Control system. The configurable range of the HIGH alarm is
(control set point) +16 ºF.
Note:
A product simulator temperature sensor must be installed in order to
enable associated alarm functions.
PRLO
The PRLO parameter sets the low temperature alarm set point for the
product simulator temperature. This set point and associated alarm is
valid for the Safe-NET system when applied as a Monitoring or
Control system. The configurable range of the LOW alarm is (control
set point) –16 ºF.
Note:
A product simulator temperature sensor must be installed in order to
enable associated alarm functions.
ADLY
The ADLY parameter sets the alarm delay in minutes for the discharge
air temperature. In the event that the sensed temperature of the
product simulator exceeds the pre-set high temperature alarm setting
for the discharge air temperature sensor for a period equal to or
greater than theADLY setting, the alarm is signaled. This is true for
low temperature alarms as well. There is only one time delay associated
with all discharge air temperature alarms.
Note:
One or more Discharge Air temperature sensors must be installed in order
to enable associated alarm functions.
HIGH
The HIGH parameter sets the high temperature alarm set point for the
discharge air temperature sensor(s). This set point and associated alarm
is valid for the Safe-NET system when applied as a Monitoring or
Control system. The configurable range of the HIGH alarm (control
set point) is +16 ºF.
LOW
The LOW parameter sets the low temperature alarm set point for the
discharge air sensor(s) temperature.This set point and associated alarm
is valid for the Safe-NET system when applied as a Monitoring or
Control system. The configurable range of the LOW alarm (control set
point) is –16 ºF.
Safe-NET™ Self-contained Operating Instruction Page 5 of 8 — P/N 0485005_B
www.hussmann.com/cstore/c_techinfo.htm © 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.
20 June 2007

INPT
Safe-NET display module is equipped with a general-purpose digital
input. Purpose and associated actions of the input are defined in
accordance with the needs of the application and/or user requirements.
The following input definitions are available:
•NONE
Not used.
•ALAR
Safe-NET Alarm Module attached. Used to communicate with
the Alarm Module.
•DFRT
Used to terminate defrost from switch input (bi-metal device;
i.e., Klixon).
•CLEN
Clean switch. De-Activates refrigeration to the fixture and
disables high temperature alarms.
•DOOR
Monitors door openings and closings to deactivate evaporator
fans and or alarm.
•DUAL
Allows for dual temperature operation of cases so equipped.
Note:
Configuring the switch for operation not enabled by hardware will result
in erroneous alarms and unpredictable performance.
The Safe-NET system must be RESET for the new value to take effect.
CASE
This menu item allows the user to configure operating parameters
based on case type. Selecting the appropriate case type and then
performing a RESET on the Safe-NET system loads the default
operating parameters into the NV memory.
The Safe-NET menu system can be used to tailor these parameters to
meet specific needs. Once modified from the default setting, they will
remain active until modified by the user again.
An extra level of security has been added to this modification
procedure to further protect the operating parameters from errant
modification.
To change the case type:
Navigate to the CASE menu. Press the UP / DOWN buttons on the
Safe-NET display module until‘NONE’ is displayed. Press the
SELECT button on the Safe-NET display module. Again use the UP /
DOWN buttons to navigate to the desired case. Press the SELECT
button on the Safe-NET display module. Then RESET the Safe-NET
display module. On RESET the Safe-NET display module will load
the appropriate default settings for the case type selected.
Always go to‘NONE’then case type.
CLOCK MENU
This menu allows the user to set the internal Time-of-Day (TOD)
clock. This clock is a 24 hour clock that displays hours in the range
of 00 to 23. Minutes are displayed in the range of 00 to 59; i.e.,
8:00 A.M. = 08.00 and 8:00 P.M. = 20.00. To set the time, the valid
PASSWORD must be entered first. See the section on entering
PASSWORD for instructions on how to do this.
Enter the CLOCK menu by pressing the SELECT button on the
Safe-NET Display module until CLOC is displayed. Once the CLOCK
menu is entered, the display will cycle between CLOC and the current
time. While the time is being displayed, press the SELECT button on
the Safe-NET display module to edit the time value. The first press of
the SELECT button allows editing of the minutes. With the Safe-NET
display module flashing the minutes value, use the UP /DOWN buttons
on the Safe-NET display module to increment or decrement the
minutes to the desired value. Press the SELECT button to store the
new minutes value and begin editing the hour value.With the
Safe-NET display module flashing the hour value, use the UP /DOWN
buttons on the Safe-NET display module to increment or decrement
the hour to the desired value.
Once the desired hour is displayed, press the SELECT button on the
Safe-NET display module to store the new time. The display will now
cycle between CLOC and the new time.
To exit the menu, press the UP and DOWN buttons on the Safe-NET
Display module simultaneously.
DEFROST MENU
The DEFROST menu is used to configure defrost type and scheduling
for units whose defrost is controlled by the Safe-NET display module.
This menu also contains maintenance functions for use in manually
controlling defrost for troubleshooting and repair activity.
A relay module properly connected to defrost heaters, solenoids, etc.,
is required for the defrost cycle control function. Refer to SSaaffee--NNEETT
TTeecchhnniicciiaann’’ssMMaannuuaall, section on Safe-NET wiring, for proper equip-
ment, techniques and safety considerations.
Note:
Changing these parameters as well as performing maintenance functions
requires that a valid PASSWORD be entered first.
DTYP
The Safe-NET system is capable of controlling defrost activity and
scheduling.The Safe-NET system is capable of controlling six types
of defrost: OffC, DET, Mod, ELE2, GAS, and ELE1.
1. OffC (Off-Cycle) — During off-cycle defrost, refrigeration to the
fixture is stopped by either cycling off the compressor if so equipped,
shutting off the liquid line solenoid valve, shutting off the suction
stop solenoid, or closing the EEPR if so equipped. Termination of the
defrost cycle can be configured as temperature, time, time/temperature
or via a command received from a master device when in a network
configuration.
2. DET — Defrost terminates when the digital input is high.This
requires the digital input of the Safe-NET display module to be
connected to the defrost termination temperature activated switch.
Defrost will terminate when the coil temperature satisfies the setting
of the termination temperature activated switch.
3. Mod — Modular defrost is selected to support HUSSMANN
medium temperature Impact™cases with modular coils installed. Each
4 foot section of coil defrosts in sequence up to 28 minutes each hour
(overridden by termination temperature if temperature is reached
before the timer expires).
4. ELE2 — ELE2-type defrost will terminate the defrost cycle based
on time or termination temperature. The defrost heaters will
de-energize but refrigeration will not start until a command is received
from a master device.This is done to coordinate restart of refrigeration
after all cases in a system have finished their associated defrost cycle.
5. GAS — Not Available at this time.
6. ELE1 — ELE1-type defrost will terminate the defrost cycle based
on time or termination temperature. The defrost heaters will
de-energize and refrigeration will start simultaneously. This type is for
stand-alone operation of low temperature units.
Note:
A relay module properly connected to defrost heaters, solenoids, etc., is
required for this control function.
STOP
To prematurely terminate a defrost cycle, navigate to the DEFROST
submenu item. The display will show STOP. While STOP is being
displayed, press the SELECT button on the Safe-NET display module.
This will terminate the defrost cycle and cause the display module to
terminate according to the programmed terminate sequence.
START
To initiate a defrost cycle, navigate to the DEFROST submenu item.
The display will show STRT. While STRT is being displayed, press the
SELECT button on the Safe-NET display module. This will initiate
the defrost cycle and cause the display module to initiate a defrost cycle
according to the programmed defrost sequence.
FCTL
The Safe-NET system is capable of controlling defrost activity and
scheduling.This menu setting determines evaporator fan operation
during defrost.
1. Selecting DTCL causes the fans to cycle in conjunction with the
defrost termination temperature activated switch. Fan operation is
inverted from the switch operation to cause the fans to be off during
defrost and on (running) after defrost termination.
2. If NONE is selected, fan control is disabled during defrost.
3. DFON causes the evaporator fans to run throughout the defrost
cycle
4. DFOF turns the fans off during defrost. The evaporator fans will
resume operation when defrost terminates from time or temperature or
after a preset coil temperature is reached. This value is set in the setup
(STUP) menu.
Note:
At least one coil temperature sensor must be installed for fan control by
coil temperature.
TSET
The Safe-NET system is capable of terminating defrost activity based
on evaporator coil temperature, return air, or discharge air. When the
Safe-NET system is configured to control defrost, theTSET setting
provides a temperature set point at which to terminate a defrost cycle.
This setting is only effective when defrost termination is set toTSEN,
RAIR or DAIR.
Note:
At least one coil temperature sensor, one discharge air sensor or one
return air sensor must be installed, and defrost termination must be
set to TSEN for this setting to have an effect.
Safe-NET™ Self-contained Operating Instruction Page 6 of 8 — P/N 0485005_B
© 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A. www.hussmann.com/cstore/c_techinfo.htm
20 June 2007

DURA
The DURA parameter sets the time duration in minutes for defrost
cycle operation. This time applies to all types of defrosts and acts as a
fail safe time for those defrosts terminated by coil temperature or the
temperature activated switch. In the event that the sensed temperature
of the coil does not reach the preset termination temperature in the
time allotted by this setting, the defrost will terminate and
refrigeration will resume in accordance with the applicable settings
(fan control, master comm. control, etc.)
TTYP
The Safe-NET system is capable of terminating defrost activity based
on evaporator coil temperature (TSEN), return air (RAIR), discharge
air (DAIR), time (TIM) or input from a termination temperature
activated switch (DIGI). When the Safe-NET system is configured to
control defrost, this setting determines which input parameter is used
to terminate a defrost cycle.The DURA setting is always enabled as a
fail-safe defrost duration time in the event a selected termination input
fails. If the failure is such that defrost termination would occur imme-
diately, a 10- minute guaranteed defrost cycle duration is employed.
Note:
The sensed input selected for defrost termination must be installed and
defrost termination set to TSEN for this feature to operate.
STAR
The STAR parameter sets the time of day for the first defrost cycle and
works in conjunction with the NDEF parameter discussed below. This
time setting is for the initial defrost in a 24-hour period. The NDEF
(number of defrosts) determines the number of defrosts that will occur
in a 24-hour period beginning with the STAR (first defrost) parameter.
The maximum number of defrosts allowed in a 24 hour period is 8.
The defrost cycles are spaced evenly across the 24- hour period
beginning with the STAR time. The formula for calculating defrost
start times is as follows:
Defrost interval = 24/NDEF
First defrost cycle start time = STAR
Second start time = STAR + Interval
Third start time = STAR + 2 X Interval
~
Eighth start time = STAR + 7 X Interval
For example, with a STAR value of 01:00 and an NDEF setting of 4
the defrost cycle start times are:
1:00 A.M.
7:00 A.M.
1:00 P.M.
7:00 P.M.
This scheme applies to all types of defrosts.
NDEF
The NDEF parameter sets the number of defrost cycles in a 24-hour
period.This number works in conjunction with the STAR parameter
discussed above. The NDEF (number of defrosts) determines the
number of defrosts that occur in a 24-hour period beginning with the
STAR (first defrost) parameter. The maximum number of defrosts
allowed in a 24 hour period is 8.The defrost cycles are spaced evenly
across the 24- hour period beginning with the STAR time. The formula
for calculating defrost start times is as follows:
Defrost interval = 24/NDEF
First defrost cycle start time = STAR
Second start time = STAR + Interval
Third start time = STAR + 2 X Interval
~
Eighth start time = STAR + 7 X Interval
For example, with a STAR value of 01:00 and an NDEF setting of 4,
the defrost cycle start times are:
1:00 A.M.
7:00 A.M.
1:00 P.M.
7:00 P.M.
This scheme applies to all types of defrosts.
TEMPS MENU
The TEMPS menu is used to display the individual temperatures,
pressures, voltages, current or power factor of connected individual
sensors. The following list shows the order in which the values would
be displayed if all possible sensors were connected. However, the
Safe-NET display module allows only 10 (ten) of the sensors to be
connected simultaneously. At this time, there is no known application
where all 10 sensors or all available sensors would be applied.
The order in which the temps are displayed is dependent upon which
sensing devices are installed, as represented to the right. Missing or
non-connected sensors will not appear in the designated sequence.
Average temperatures are available to view so long as the associated
sensing devices are attached.
DSAV= Discharge Air Average
RTAV=Return Air Average
PDAV=Product Average
T-LO=LowestTermination Sensor Reading
ILET=Evaporator Inlet
OLET=Evaporator Outlet
TSNL=Left Termination Sensor
TSNC=Center Termination Sensor
TSNR=Right Termination Sensor
DSCL= DischargeAir Left
DSCC=Discharge Air Center
DSCR=Discharge Air Right
RETR= Return Air Right
RETC=Return Air Center
RETL= Return Air Left
PRDR=Product Right
PRDC=Product Center
PRDL=Product Left
ANTI=Anti-sweat Heater temp
PRES-LO=0-200 PSI
TEMP-LO=0-200PSI liquid temp
PRES-HI=0-500 PSI
TEMP-HI=0-500 PSI liquid temp
Controlled load Volts
Controlled load Amps
Controlled Load Power factor
VALVE MENU
The Valve menu is used to configure temperature control output type
and operational parameters for units whose temperature controlling
device (compressor, VSD, liquid solenoid, suction stop solenoid, EEXP,
EEPR) is controlled by the Safe-NET display module. This menu also
contains maintenance functions to allow manual control of a tempera-
ture controlling device for troubleshooting and repair activity.
A relay module properly connected to the compressor contactor,
solenoids, etc., is required for temperature regulating device control
functions. Refer to Safe-NET Technician’s Manual, section on
Safe-NET wiring, for proper equipment, techniques and safety
considerations.
Note:
Changing these parameters (as well as performing maintenance
functions) requires that a valid PASSWORD be entered first.
DSVR
The Safe-NET display module software version. The value is not user
changeable so a PASSWORD isn’t needed.
DHVR
Safe-NET display module hardware version. The value is not user
changeable so a PASSWORD isn’t needed.
CLAV
CSVR
CHVR
C-OF
V-OF
NORL
CLOSE
OPEN
SREF
VTYP
This menu item defines the temperature control method applied. This
can consist of electronic evaporator pressure regulating valves, elec-
tronic expansion valves, on/off control of fixed speed compressors,
variable speed drive control of VSD driven compressors, PWM control
of liquid line solenoids and /or suction stop solenoids.
Depending on the temperature control strategy employed, a relay
module properly connected to the compressor contactor, solenoids,
etc., and /or a Safe-NET control module is required for temperature
regulating device control functions. Refer to Safe-NET Technician’s
Manual, section on Safe-NET wiring for proper equipment, techniques
and safety considerations.
0-10
CD-16
CD-09
CD-08
ES-20
ES-12
VPOS
NONE
No valve or other temperature control mechanism attached. Safe-NET
used for monitoring purposes only.
CSELF
Safe-NET display module performing ON/OFF control independent of
a Safe-NET control module, but operating under a control module for
defrost coordination. Such applications could include walk-in coolers
with multiple evaporators.
SELF
Safe-NET display module performing ON/OFF control independent of
a Safe-NET control module. The Safe-NET display module can exist on
a network as a sole entity receiving command from a master device.
It controls all functions of the fixture if so equipped (defrost, lighting,
dual-temperature operation, temperature control, alarming, etc.)
OnOff
Safe-NET display module acting as user I/O for a Safe-NET control
module.The Safe- NET display module performs the on/off control
and schedules defrost, case lighting, and evaporator fan control
through the Safe-NET display module control outputs.
Safe-NET™ Self-contained Operating Instruction Page 7 of 8 — P/N 0485005_B
www.hussmann.com/cstore/c_techinfo.htm © 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.
20 June 2007
Not applicable for
self-contained units.
Not applicable for
self-contained units.

DISPLAY DEFAULT
The Safe-NET Display module can be configured to display one of
seven values continuously when not in an alarm condition or being
navigated via the Hand-Held Device or the module buttons.
The possible selections are:
1) Discharge Air Temperature Average
(the average of multiple sensors)
2) DischargeAir Set Point
3) Average Discharge Air from a Control Module, if so
equipped.
4) Product Sensor
(the lowest temperature if multiple sensors are attached)
5) Return Air Temperature Average
(the average of multiple sensors)
6) Product Simulator Temperature Average
(the average of multiple sensors)
7) Time-of-Day Clock
To select this item for modification, press the SELECT button on the
Safe-NET display module. The display will cycle between DISP and the
current setting. While the setting is being displayed, press SELECT
button on the Safe-NET display module to allow editing of the value.
When the Safe-NET display module begins flashing the value, use the
UP or DOWN buttons on the Safe-NET display module to change the
setting.
Once the desired setting is displayed, press the SELECT button on the
Safe-NET display module to store the new value to NV memory. The
display will revert to cycling between DISP and the new value.
Note:
One or more sensors of the type selected must be installed to support the
selection.
Alarm Module (OPTIONAL)
The alarm module is an additional feature to Safe-NET. The alarm
module supplies power to the display module via an 8-wire cable. The
alarm module provides battery back up power to the display module
during loss of A.C. power. The display module communicates with the
alarm module via a 2-wire cable.Additionally, the alarm module is
equipped with a beeper to provide audible notification of alarms.
DISPLAY SYMBOL IDENTIFICATION
Safe-NET™ Self-contained Operating Instruction Page 8 of 8 — P/N 0485005_B
© 2007 Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A. www.hussmann.com/cstore/c_techinfo.htm
20 June 2007
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Detailed technical information is available
in the Safe-NET Technician’s Manual
(Hussmann part number 0461391A), at
http://www.hussmann.com/docs/inst
_manuals/other/0461391A_SafeNET.pdf