BUILDING WIRING CHECKOUT PROCEDURE (REFER TO WIRING DIAGRAM 841-610)
1. Check notification-appliance and initiating-
device circuits for absence of voltage, shorts,
or opens as follows:
A. At the control panel, locate the notification-
appliance or one of the initiating-device
circuits.
B. Set volt-ohmmeter to 300VAC.
C. Place meter probes so that black probe is
on I‘-” wire and red probe is on I‘+” wire.
Volt-ohmmeter should read OV (Fig. 7). If
you read a voltage, check circuit wiring.
D. Set volt-ohmmeter to GOVDC and repeat
step 1C.
E. Set volt-ohmmeter to OHMS X 10 and place
meter probes as described in Step 1 C.
If reading indicates no continuity (open
circuit, see Fig. 8) or a short circuit (see Fig.
9), locate and correct open/short in circuit.
Note: If reading indicates an open circuit in
an initiating circuit, make sure that all
smoke detector heads are mounted
and seated in their bases.
F. Repeat Steps 1A thru 1 E for all zone
circuits.
2. Check system’s other external circuits as
follows:
A. Locate wires for each of the systems circuit
not yet tested.
B. Check for voltage on circuit as described in
Steps 1 B thru 1 D.
C. Set volt-ohmmeter to OHMS X 10 and place
meter probes across circuit being tested
Reading should indicate an open circuit
(Fig. 8).
If reading indicates a short circuit (Fig. 9) or
something less than infinity (-), check
circuit wiring.
Notes: 1. Normally-closed (N/C) relay circuits
(auxiliary relays and trouble relay) will
correctly read 0 ohms.
2. City circuit (if. used) will read 15 to 5000
ohms depending on type of city
connection.
D. Repeat Steps 2A thru 2C for the external
circuits not yet checked.
THIS READING
INDICATED NO
FIGURE 7
NORMAL RANGE
THIS READING
INDICATES AN
OPEN CIRCUIT
FIGURE 8
NORMAL RANGE
THIS READING
INDICATES AN
OPEN CIRCUIT
FIGURE 9
10
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