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USER INSTRUCTIONS

Your refrigerated case uses a Hussmann Safe-NET

TM

III temperature and

defrost controller to precisely maintain the temperature and prevent frost
buildup on the cooling coil. LEDs indicate when the compressor or
refrigeration is on, when the case is in a defrost cycle, if the temperature is
outside the desired range, or if there is a sensor failure. An adjustment knob
allows the temperature to be set within the configured range and can power
off the controller and compressor. Your controller has been custom-configured
to provide the best temperature and defrost control for your chilled or frozen
food.

The front of the controller has an adjustment knob and status LEDs. The back
of the controller has connections for sensors and switched equipment.

Temperature and
Defrost Controller

Summary of Contents for Safe-NET III

Page 1: ...ature is outside the desired range or if there is a sensor failure An adjustment knob allows the temperature to be set within the configured range and can power off the controller and compressor Your controller has been custom configured to provide the best temperature and defrost control for your chilled or frozen food The front of the controller has an adjustment knob and status LEDs The back of...

Page 2: ...rature or Sensor Alarm red Lights if the temperature is too warm or too cold Flashes if a sensor fails See Alarms and Codes on page 7 Rear connections Case temperature sensor Typically senses the temperature of the air in the case Used by the controller to determine when to power on or power off the compressor or refrigeration Evaporator temperature sensor Senses the temperature of the refrigerati...

Page 3: ... is not in the Off position See Your Case Configuration on page 7 for Off position functionality After the self check all LEDs turn off until the compressor starts There may be a delay before the compressor starts If the red Temperature or Sensor Alarm LED stays on after the self check see Alarms and Codes on page 4 The green Compressor Powered On LED turns on when the compressor starts Temperatur...

Page 4: ... The defrost termination switch is temperature activated and senses the completion of defrost Your Case Configuration on page 7 shows whether your case includes a defrost termination switch Manual Defrost Note The above procedure initiates a manual or forced defrost The control has protective settings to prevent short cycling of the compressor A The compressor may run for as long as 1 minute after...

Page 5: ...from a copy card The copy card allows service personnel to update the configuration of a controller CAUTION This procedure must be followed exactly or the controller may be damaged 1 Disconnect power to the case the controller must be powered off 2 Connect the copy card to the controller 3 Make sure the adjustment knob is not in the Off position 4 To start the installation reconnect power to the c...

Page 6: ...ration unit fan heater and controller are not connected to the electrical supply Do not apply voltage to the digital input Compressor Phase Line 2 Phase Line 1 Heater Fan Safe NET III Controller Common Evaporator Temperature Sensor P2 Control Sensor Pb1 Digital Input D I 90 240Vac Line Supply Compressor Defrost Heater optional Defrost Fan optional AC Line Supply AC Line Supply AC Line Supply Contr...

Page 7: ...LED does not turn off after one hour call service Red LED flashes Temperature sensor failure E1 indicates a case temperature failure E2 indicates an evaporator temperature sensor failure Check the optional display for error code E1 or E2 and call service immediately Factory Setting Average product temperature 10 F Knob position 5 Adjustment knob has Off position Yes Delay before compressor runs af...

Page 8: ...8 Hussmann Corporation Ingersoll Rand Climate Control Technologies 12999 St Charles Rock Road Bridgeton MO 63044 www hussmann com 2009 Invensys Controls All Rights Reserved ...

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