Figure 3 : Zone Doubling Connection
The following limitations apply to zone doubling:
1. Only normally closed contacts (n/c) may be used.
2. If the zone input to the panel is short or open circuited at the panel, both the zone and its double
will be violated.
3. If the 12K resistor is “open circuited” the primary zone will indicate a violation i.e. assuming zone
8 is doubled in this case zone 8 will be indicated as violated.
4. If the 4K7 resistor is “open circuited” the secondary zone will indicate a violation i.e. assuming the
example in 3 above zone 16 would indicate the violation.
5. The colour codes for the 4K7 and 12K resistors are shown in Figure 4.
Figure 4 : Resistors (Tamper per Zone or Zone Doubling)
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