nVent Hoffman S060316G031, Instruction Manual

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ALARM CONDITION DISPLAY
There are eleven possible on-latching alarm conditions detectable by the controller that are indicated on the
controller display. All alarms can also be accessed through the Ethernet and USB connections with the optional
remote access communication board.
Alarm
Mnemonic
Description Cause Result Alarm Relay
tP General Alarm
Door open and/or smoke
detected
Unit turns off for
duration of alarm
Relay Contact
Closed
LA High Pressure Warning
MALF high pressure switch
opens (See Note 3 below)
No effect on function N/A
LP Low Pressure Alarm
Low pressure switch open
(see note 4 below)
No effect on function
Relay Contact
Closed
E1
Air Inlet Temperature Sensor
Alarm
Sensor Failure See Note 1 below
Relay Contact
Closed
E2
Air Outlet Temperature Sensor
Alarm
Sensor Failure See Note 2 below
Relay Contact
Closed
Ht
High Temperature Alarm
Default = 55°C
Air inlet temperature greater
than 55°C
No effect on function
Relay Contact
Closed
Lt
Low Temperature Alarm
Default = 14°C
Air inlet temperature less than
14°C
No effect on function
Relay Contact
Closed
A1 Frost Alarm
Air outlet temperature less
than or equal to -1.0°C
Compressor and
Condenser fan off
for duration of alarm
Relay Contact
Closed
HP/HP1 High Pressure Serious Alarm
High pressure switch open
(see note 5 below)
Unit turns OFF for
duration of alarm
Relay Contact
Closed
LC Lost Communication Alarm
The Master cannot
communicate with any
Slave, or the Slave cannot
communicate with the Master
No effect on
function. Unit will
enter standalone
mode
N/A
LC1 Lost Communication Alarm
The Master cannot
communicate with one of the
Slaves
No effect on
function. Unit will
enter standalone
mode
N/A
NOTE 1: Air inlet temperature sensor will default to air outlet temperature sensor. Cooling setpoint defaults to 10°C.
NOTE 2: Unit continues to operate without evaporator freeze protection.
NOTE 3: The MALF high pressure switch is optional.
NOTE 4: The Low pressure switch is optional.
NOTE 5: The High Pressure (HP) or High Pressure Serious (HP1) switch is optional.
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