Varifan MST-5, Руководство пользователя, Страница: 12 / 44

Page 12
MST 5
2.5 TEMPERATURE PROBES
Temperature probes use a “Class 2” low voltage circuit.
These cables (caliber #18AWG min) can be extended
up to a distance of 500 feet (150 meters). Single probe
temperature connection is illustrated in figure 3, while 4
temperature averaging probe connection is illustrated in
figure 4.
2.5.1 Single Temperature Probe
Install a single temperature probe in an area that best
reflects the overall room temperature. Connect the two
leads and the shield of the temperature probe to the
MST terminals labeled “Probe”, as indicated in figure 3.
2.5.2 Averaging (optional)
Four temperature probes are required to do
temperature averaging in larger rooms. Place the
probes in appropriate locations to best average the
room temperature. Refer to figure 4.
2.6 ALARM
The MST-5 provides a normally open and normally
closed dry contact for alarming low or high temperature
conditions. In addition, that same contact may be used
to signal a power failure. This contact may be
connected to an alarm system, or directly to a siren
and / or an auto-dialer.
Use shielded cabling for probes . Connect the shields
to the “SHLD” terminal. Failure to do so may result in
inaccurate readings!
Momentary power interruptions may trigger false
alarms! To avoid false alarming when the MST is
connected to an alarm system, install a time delay
relay between the MST and the alarm system.
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