4
The wire interconnecting the detector bases is continuously super-
vised by a small electrical current flow through the circuit to the end-
of-line resistor (1.8K ohms) mounted in the base of the last detector.
In order to keep this supervision complete, no parallel branching of
wires is permissible. Every base, except the last one, will have one
set of incoming, and one set of outgoing wires.
b. Installing Bases:
Mount end-of-line resistor between appropriate terminals of last base
on circuit, as indicated on wiring diagram. Mount all bases to outlet
boxes. Manual Stations, Thermal Detectors, Air Duct Detectors, etc.,
are to be connected to the circuit at this time. Please refer to wiring
diagrams for specific equipment for connection details.
3.5 Test of Wiring:
Note:
It is suggested that electrical tests be conducted jointly by the
installer and the manufacturers technician or representative. Fifteen
(15) days prior written notice is requested so that the services of the
technician may be scheduled.
The installation of the wiring should be checked as follows:
a.
Detectors should not be in their bases. Temporary jumpers
should be inserted appropriately in all bases. Install end-of-line
resistor to appropriate terminals of last detector on circuit.
Wiring from bases should NOT be connected to Control Panel
at this time.
b.
Check the wiring of the detector circuit with ohmmeter. Resis-
tance reading between wires normally connected to terminals 3
and 4 of the Control Panel should be approximately 1.8K ohms.
Short the detector lines together and megger the combined lines
to chassis and conduit. There should be at least 10 meg resis-
tance reading between wires and conduit or ground.
c.
Connect wires to appropriate terminals of the Model CP-48. For
base wiring, follow instructions included with base.
d.
The manufacturers service representative will then install
detectors and check sensitivity.
3.6 Test for System Operation:
a.
See that the CP-48 Control Unit is in normal standby operation.
b.
To test for supervision of initiating circuit, remove the detector
connected to the last device and check that proper trouble
indicators respond in the system. Re-connect detector.
c.
To test operation of initiating circuit, actuate a detector. Check
that system fire indicators and alarm relay contacts respond to
the alarm.
d.
Test operation of detector circuit, activate each detector and
manual station, one at a time, resetting each, and check that
detector base lamp and the control unit alarm controls operate.
Each ionization detector may be activated by blowing smoke
into the chamber or holding a lighted match a few inches below
it. The manual station on front panel should be checked
independently.
INPUT
48V +7/-6 VDC,
500mA FUSE
INTERNALLY AT 2A
SUPERVISORY 12mA
ALARM 100mA MAX
SUPERVISED
DETECTOR LINES
21.5 VDC
ION OR PHOTO
DETECTOR
THERMAL DETECTOR
MANUAL STATION
TROUBLE
OPERATED
CONTACTS
RATED 1A
120 VAC/48 VDC
ALARM
OPERATED
CONTACTS
RATED 3A
120 VAC/48 VDC
1.8K, 1/2W, 5%
END OF LINE RESISTOR
NOTES
:
1. Contacts are shown in normal supervisory
condition.
2. See wiring diagram of specific detector type
for proper screw terminal connections. Compat-
ible detectors are shown in the Table on page 5.
3. Input voltage not to exceed 56 volts peak.
Figure 3
Wiring Diagram
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