6) Setting the alarm trip setpoint
Three buttons have been provided to allow the alarm trip point adjustment between 0 and 50ºC. To set the
desired alarm trip point, first press the “Zone 2” button until the display changes to screen 9, the display
will show the current alarm trip point. Whilst holding down the “zone 2” button, repeatedly press the
“Up” or “Down” buttons until the desired alarm temperature is displayed in the screen. Once the desired
alarm temperature is on display, release both buttons. If required, the new setpoint can be verified by
pressing just the “zone 2” button again. The alarm trip point is held into non-volatile memory, so no
further adjustments will be needed unless a new alarm temperature setpoint is required. Please note; the
unit is factory set to 25ºC
Warning setting the alarm to 0 or 50ºC will setup an alarm but the display will change to screen 7 once
the temperature drops below 0ºC or above 50ºC.
7) Positioning the temperature sensor
Care should be taken when positioning the sensor. Remember, hot air rises and forms hot spots, i.e. a
room left hand corner away from any heat source could be 21ºC, whereas the right-hand corner next to
the heat source could be 25ºC. Also positioning the sensor one metre from the floor when the bulk of the
heat source being at two meters, could lead to damage to sensitive equipment because the sensor is
measuring the lower ground floor temperature. Therefore, it is important to mount the sensor in a
position where the room is likely to get the hottest and at a height to cover the whole equipment i.e. a 2m
high server rack would be best if the sensor were mounted at an approximate height of 2 or 2.5 metres on
a wall or column next to the server racks. If the location and type of heat source are unknown at the time
of installation, try positioning the sensor between 1.8 and 2.5 metres (depending on room height) from the
floor in the centre of the room.
8) Power, BMS, beacon and SMS connections
The Common alarm relay is normally energised, de-energised in alarm or power fault, therefore
both “Common Alarm” contacts are identified correctly when the unit is powered and has no
current alarms.
Output Volt Free contacts for use by a Building Management System.
Function Required Fitted as Standard Relay Output Terminals
