Hussmann Safe-NET Technician Manual

®

Safe-NET™

Technician’s Manual

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

November 2005

P/N 0461391A

INTRODUCTION

What is Safe-NET . . . . . . . . . . . . . . . . . . . . . 1-1

Temperature Monitoring . . . . . . . . . . . . . . 1-1

Components . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Display Module . . . . . . . . . . . . . . . . . . . . . 1-2

Digital Sensors . . . . . . . . . . . . . . . . . . . . . . 1-2

Optional Wireless Hand-held Controller

and/or PC Control . . . . . . . . . . . . . . . . . . . 1-2

INSTALLATION

Self-Contained Case . . . . . . . . . . . . . . . . . . . 2-1

Three-Button Rules . . . . . . . . . . . . . . . . . . . . 2-1

SAFE-NET DISPLAY & ALARM MODULES

Description . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Safe-NET Display Module . . . . . . . . . . . . 3-1

Alarm Module . . . . . . . . . . . . . . . . . . . . . . 3-1

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Normal . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Product Temperature Alarms . . . . . . . . . . 3-2

Power Failure . . . . . . . . . . . . . . . . . . . . . . 3-2

Low Battery . . . . . . . . . . . . . . . . . . . . . . . 3-2

Connection Failure . . . . . . . . . . . . . . . . . . 3-2

Precedence of Alarms . . . . . . . . . . . . . . . . 3-2

Alarm Set Points . . . . . . . . . . . . . . . . . . . . 3-3

Modifying ARL/ARV Settings . . . . . . . . . . 3-3

Password . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Modifying Set Points . . . . . . . . . . . . . . . . . . 3-5

Wiring Diagram for Display Module

and Alarm Module . . . . . . . . . . . . . . . . . . 3-6

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

SEnS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

noSn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

dSHi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

dSLo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

CoM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

PrHi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

PrLo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Impact Multiple Coils . . . . . . . . . . . . . . . . 3-8

SC-C . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

SC-L . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

SC-r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Door Open . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

MENUS

Menu Presentation Conventions . . . . . . . . . 4-1

Menu Navigation Overview . . . . . . . . . . . . . 4-2

Time Outs . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Password . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Inactivity . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Escape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Button Action . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Display Symbol Identification . . . . . . . . . . . 4-4

Top Level Menus . . . . . . . . . . . . . . . . . . . . . 4-5

Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Password Protection . . . . . . . . . . . . . . . . . 4-8

DSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

PSEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

CNTN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

DSPN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

RST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

iiiP/N 0461391A

CONTENTS

IMPORTANT

KEEP IN STORE FOR FUTURE REFERENCE

Quality that sets industry standards.

12999 St. Charles Rock Road • Bridgeton, MO 63044 U.S.A. • [phone] • FAX [phone]

®

NSEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

LGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

DEGR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

DUTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

DIFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

FSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

CTRL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

PD-L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

PRHI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

PRLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

ADLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23

HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

INPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

CASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27

Default Settings and

Case Type Descriptions . . . . . . . . . . . . 4-28

Clock Menu . . . . . . . . . . . . . . . . . . . . . . . . . 4-29

Defrost Menu . . . . . . . . . . . . . . . . . . . . . . . . 4-30

DTYP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30

STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

START . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

FCTL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33

TSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

DURA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35

TTYP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

STAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

NDEF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38

Temperatures Menu . . . . . . . . . . . . . . . . . . . 4-38

Valve Menu . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

CLAV . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

DSVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

DHVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

CSVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

CHVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

C-OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

V-OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42

NORL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43

CLOSE . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43

OPEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43

SREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

VTYP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44

VPOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45

Display Default . . . . . . . . . . . . . . . . . . . . . . . 4-46

Dimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46

WARRANTY

iv

P/N 0461391A

CONTENTS (Continued)

P/N 0461391A 1-1

INTRODUCTION

WHAT IS Safe-NET™

Safe-NET is an advanced, electronic system for
monitoring or controlling case temperatures in one or
more locations. It will help you ensure continuous,
reliable refrigeration and safer, fresher foods, 24 hours a

Alarm Module

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 maintaining 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

Power Supply
(Transformer)

Display Module

Sensor

Harness

Temperature Sensor

ARV / ARL
Kit Alarm

Typical Safe-NET™ Installation

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.

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Typical Safe-NET™ Components

Safe-NET™

1-2

INTRODUCTION

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
pushbuttons or the hand-held controller.

Safe-NET™ Display Module

Up to 10 sensors can be connected to each display
module.

OOppttiioonnaall

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.

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.

Safe-NET™ Hand Held Controller

If the wireless controller is not available, it is possible to
program the controller directly with buttons located on
the display module.

Typical Safe-NET™ Sensor Harness

P/N 0461391A

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 setpoint.

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.

P/N 0461391A 2-1

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

INSTALLATION

DESCRIPTION

Safe-NET Display Module

The Safe-NET Display Module, shown in
Figure 1 and Figure 2, is a temperature­monitoring 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.

Alarm Module

The alarm module, shown in Figure 3, 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.

OPERATION

Normal

During normal operating conditions, the product
simulator temperature is displayed. The GREEN
LED on the alarm module is lighted (as shown in
Figure 3).

3-1

Safe-NET™DISPLAY & ALARM MODULES

P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

Figure 1. Safe-NET Display Module with Top Cover

LED Indicators

Figure 2. Safe-NET Display Module with Cover Removed

Figure 3. Safe-NET Alarm Module

Green LED

SELECT Button

UP Button

DOWN Button

DOWN Button

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.

3-2

P/N 0461391A

DISPLAY & ALARM MODULES

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

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

Following are the alarm set points for ARL and
ARV cases:

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.

MODIFYINGARL/ARV SETTINGS

The Safe-NET display module stores alarm set
points and alarm delay times for monitoring ARL
and ARV 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.

3-3P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

Case

Model

Set

Point

Product

High Alarm

Set Point

Product

Low Alarm

Set Point

Product Alarm

Delay

(Minutes)

ARL –8ºF 2ºF –22ºF 90

ARV 36ºF 43ºF 32ºF 60

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.

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.

3-4

P/N 0461391A

DISPLAY & ALARM MODULES

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 the VALUE. Press
the UP button to increment the value or the
DOWN button to decrement the value. The value
of the parameter can be modified only within the
following specified ranges:

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.

Replace top cover of the display module after
modifications are complete. Verify that alarm
LED indicators are on the left side as shown in
Figure 1 on page 1.

3-5P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

Case

Model

Range of

Product

High Alarm

Set Point

Range of

Product

Low Alarm

Set Point

Range of

Product

Alarm Delay

(Minutes)

ARL

–8ºF to 8ºF –24ºF to –8ºF 0 to 240

ARV

36ºF to 52ºF 20ºF to 36ºF 0 to 240

3-6

P/N 0461391A

DISPLAY & ALARM MODULES

Wiring Diagram for Display Module and Alarm Module

Safe-NET™

Battery Backup with Piezo Alarm, revision 1.01

06/17/05 MPK

Display Module

Alarm Module

audible alarm

(piezo)

ALARM

GROUND

RS-485B

ANTI-SWEAT

COMPRESSOR

GROUND

RS-485A

DEFROST

FAN S

12VDC

RCVR

1

2

1

2

3

4

5

6

7

8

red

1

blk

2

grn

1

org

2

blu

3

blk

4

wht

5

ylw

6

brn

7

red

8

P3

1

1

2

2

P1

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

alarm

status

DRY CONTACT

GROUND

RS-485B

ANTI-SWEAT

LIGHTS

GROUND

RS-485A

DEFROST

FAN S

12VDC

PSEN RXD

P2

12VDC

P5
1

3

5

N/C

5VDC

1

2

3

4

2

4

6

P4

1

2
3

4

RS-485B

RS-485A

GROUND

TXD 5VDC

RST GND

SENSE

GROUND

RS-485 unterminated

1

red

2

wht

3

blk

4

product

simulator

12VDC

8

FAN S

12VDC

7

6

5

4

3

2

1

J1

1

2

90VAC - 264VAC

NEUTRAL

Power Supply

1.25A @ 12VDC

(0459302)

T9RKE1250LCP-Y

AC power cord (0459303)

7031116F000

DEFROST

RS-485A

GROUND

COMPRESSOR

ANTI-SWEAT

RS-485B

J4

1

1

2

2

9V Battery

GROUND

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.

T

HIS ALARM IS AVAILABLE ONLY IF DISCHARGE SENSORS ARE

INSTALLED

.

Note: Programmable alarm delay (AdLy) is described in

a later section.

3-7P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

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 Temperature Alarm – “PrHi”

This alarm will be generated if the product simulator

average is above high alarm set-point for product alarm

delay time

T

HE PRHI AND PRLO ALARMS ARE AVAILABLE ONLY IF

PRODUCT SENSORS ARE INSTALLED.

Product Low Temperature Alarm – “PrLo”

This alarm will be generated if the product simulator

average is below low alarm set-point for product alarm

delay time.

Sectional Faults for

Medium Temperature Impact Cases

with Multiple Coils

A section of the modular coil is above or below the alarm

set point for the period of time set in the programmed

alarm delay.

Center section of a 12-ft case.

Left-hand section of an 8- or 12-ft case.

Right-hand section of an 8- or 12-ft case.

3-8

P/N 0461391A

ALARMS

Door Open Alarm

This alarm will be generated only if the input of the

display is connected 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.

3-9

P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

G

MENU PRESENTATION CONVENTIONS

Denotes that the Safe-NET Display is cycling between
displayed menu items and parameter values.

DOWN arrow or button press.

Denotes circular menu navigation.

Denotes menu item or value on display.

UP arrow or button press

UP or DOWN arrow or button may be used

ENTER Key or SELECT Button Press

Automatic Menu Navigation

4-1

MENUS

P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

DSPN

Value

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 ENTER key

on the Hand-Held device or pressing 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 PASSWORD 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 keypad 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.

ESCAPE

To leave a Menu and return to the default display, press

the ESCAPE key on the Hand-Held device or press the

UP and DOWN buttons on the Safe-NET Display module

simultaneously. If a valid PASSWORD has been entered

it will remain active for the remainder of the 5-minute

time out period. This allows for exiting one menu and

entering another for the purpose of modifying a value

without having to re-enter the PASSWORD.

4-2

P/N 0461391A

MENUS

A modified value will revert to its original value if the

value has been modified but the ENTER key or SELECT

button has not been pressed before pressing the ESCAPE

key on the Hand-Held device or simultaneously pressing

the UP and DOWN buttons on the Safe-NET Display

module.

CLEAR

Pressing the CLEAR key on the Hand-Held device while

editing a menu item value clears numeric values to 0 and

resets text items to the initial available selection.

BUTTON ACTION

This photo identifies the buttons and the corresponding

action on the Safe-NET Display Module.

This photo identifies the buttons and the corresponding

actions and alternate actions on the Safe-NET Hand Held

Controller.

4-3P/N 0461391A

Hussmann Corporation • Bridgeton, Missouri 63044-2483 U.S.A.

Safe-NET™

Safe-NET™ Hand Held Controller

SELECT Button

UP Button

Safe-NET™ Display Module

Button Action

DOWN Button

SETUP

Discharge

TEMPS

Left

ESCAPE

Back

Inlet

CLOCK

Return

VALVE

Center

ENTER

Outlet

DEFROST

Terminate

DISPLAY
DEFAULT

Right

CLEAR

Drain

Product

DIMMERSHIFT

®

DISPLAY SYMBOL IDENTIFICATION

4-4

P/N 0461391A

MENUS

Not

Used

A

b

C

c

d

E

F

G

g

Not

Used

h

i

J

k

L

M

n

o

P

Not

Used

Not

Used

r

S

t

U

v

W

w

x

y

1

2

3

4

5

6

7

8

9

H

Not

Used

q

Not

Used

z

0

–