Emerson VH Manuel D’Utilisation

The list of alarms may be reviewed using the UP/DOWN keys. Any alarm may be selected to have its 

parameters modified by pressing the ENTER key. All alarms have a time delay and alarm type 

parameter. The high/low temperature and humidity alarms also have a programmable Trip Point. 

The Trip Point is the point at which the alarm is activated. By programming a time delay for an 

alarm, the system will delay the specified amount of time before recognizing the alarm. The alarm 

condition must be present for the amount of time programmed for that alarm before it will be annun-

ciated. If the alarm condition goes away before the time delay has timed out, the alarm will not be rec-

ognized. For software alarms such as Loss of Power, Short Cycle, and Low Suction Pressure, a time 

delay will only delay the annunciation of that alarm. The condition of the alarm is not applicable 

because the condition has already occurred. For these alarms the time delay should be left at the fac-

tory default of 0.

Each individual alarm can be selected as either DISABLED, WARNING, or URGENT. The four cus-

tom alarms may also be selected to be a Status Only input. If the alarm is DISABLED, it is ignored. If 

the alarm is WARNING or URGENT, it will be annunciated audibly, visually, and communicated to a 

Site Products System, if appropriate. If the alarm is selected to be a WARNING, the alarm will NOT 

activate the common alarm relay. When the alarm is selected to be URGENT, the alarm is first 

annunciated as a WARNING, and then annunciated again, after the programmed time delay. When 

the alarm becomes URGENT, the control will activate the common alarm relay. The common alarm 

relay is de-energized after the alarm has been recognized and when the alarm no longer exists. When 

the alarm type has been selected to be URGENT, the allowable range for the time delay from warning 

to urgent is 0 minutes to 999 hours. When any of the four custom alarm inputs have been selected as 

Status Only, they become digital inputs for monitoring only and are no longer treated as alarms. 

Humidifier Problem

2

High Head Pressure 1

2

High Head Pressure 2

2

Change Filter

2

Loss of Air Flow

3

Custom Alarm #1

0

Custom Alarm #2

0

Custom Alarm #3

0

Custom Alarm #4

6

High Temperature

30

Low Temperature

30

High Humidity

30

Low Humidity

30

Low Suction Pressure 1, 2

0

Short Cycle 1, 2

0

Compressor #1 Overload

2

Compressor #2 Overload

2

Main Fan Overload

5

Loss of Power

0