Remote Alarm (Optional) - Thermo Scientific TSX Series Installation And Operation Manual

7.8 Remote Alarm
(Optional)
Thermo Scientific
All units have factory-installed local alarm contacts that can be used for remote
alarm systems.
The maximum distance between a freezer and a remote alarm depends on the
wire gauge used. Refer to Table 6 below:
Table 6. Wire Gauges and Distance to Remote Alarm
Total Wire Length
Wire Gauge
(feet)
20 530
18 840
16 1330
14 2120
12 3370
Remote alarm terminals are located at the rear of the machine compartment. The
three terminals are: COMMON, OPEN ON FAIL (Normally Closed), and
CLOSE ON FAIL (Normally Open).
Figure 10. Remote Alarm Diagram
To install the remote alarm, make the following connections:
1. Connect the COMMON terminal on the cabinet switch to the
COMMON wire on the alarm.
2a. To get an alarm when the switch contacts open, connect the OPEN ON
FAIL terminal on the cabinet to the OPEN ON FAIL wire on the
alarm.
Distance to Alarm 1/2
Wire Length (feet)
265
420
665
1060
1685
TSX -20°C Laboratory and Enzyme Freezers
Installation
21