3
• If loop continuity is acceptable, remove jumper at each
detector location and proceed with detector head
installation.
NOTE:
To insure proper installation of the detector head into
the base, be sure wires are properly dressed at installation.
a.
Position all wires flat against the base.
b.
Take up all slack in the outlet box.
c.
Route wires away from connector terminals.
CAUTION
Detection Device Storage
DO NOT install this detection device until all
construction is completed.
DO NOT store this detection device where it can
be contaminated by dirt, dust, or humidity.
INSTALLATION OF DETECTOR HEAD
1.
Align notch in detector cover to raised surface on outer
ring of base (See Figure 3).
Figure 3
2
.
Push detector head into base and rotate clockwise to
engage electrical connections. The detector will
automatically stop and lock into place.
3.
To remove, push detector head up into the base while
rotating the detector head counterclockwise. Continue
to rotate counterclockwise until stop is reached. Then
pull downward to disengage from base.
DETECTOR SENSITIVITY
The normal sensitivity range of each Siemens Industry, Inc.,
detector can be found on the back of the detector. In general,
any condition which causes the detector sensitivity to
decrease to a value outside its normal sensitivity range is
approaching alarm and indicates that (a) a detector requires
cleaning, (b) a change in ambient or environmental conditions
has occurred, or (c) the detector is faulty.
The DI-3, DI-3H, and DI-3IS sensitivities are field adjustable.
Access to the sensitivity adjustment potentiometer is through
a hole located on the detector head face. The DI-3, DI-3H,
and DI-3IS
sensitivity is adjustable ± 0.50 VDC of the nominal
factory setting. Adjustment towards “ + ” increases detector
sensitivity. Adjustment towards “ – ” decreases detector
sensitivity. Refer to Figure 4.
The sensitivity of the DI-A3
and
DI-A3H
detectors is factory set and is not field adjustable.
Figure 4
TESTING
Testing should be performed by qualified personnel. To
ensure that the DI-3, DI-3H, DI-3IS, DI-A3, and DI-A3H are
within factory-specified sensitivity limits, a sensitivity jack test
is provided to directly measure the sensitivity of the detector
in its mounted position while powered by the system. Access
to the sensitivity test jack is obtained through five holes
located on the front face of the detector (See Figure 4). Use
sensitivity tester Model TM-I3 to test. Refer to the sensitivity
test
OPERATION MANUAL
for Model TM-I3, P/N 315-
086641. Test frequency should be in accordance with
installation and test guidelines of NFPA Standard 72.
NOTE:
To test for GO/NO GO operation, use
SIEMENS
Test Gas, P/N 315-282747, following the
instructions on the label.
MAINTENANCE
Dust accumulations may cause a shift in detector sensitivity.
For this reason, it is important that each unit be given a
periodic check and a light cleaning if necessary. The minimum
test schedule may be found in the current edition of NFPA
72, Chapter 7 for installations in the U.S., and CAN/ULC-
S537, The Verification of Fire Alarm Systems, for installations
in Canada. Cleaning program intervals should be geared to
the individual detector environment.
Clean a detector by lightly brushing all open slots. You can
also clean a detector with the suction of a vacuum cleaner,
but the suction may cause the detector to alarm; therefore, it
is recommended that power be disconnected during cleaning.
The detectors are not designed for thorough cleaning in the
field. When the detector sensitivity falls outside the acceptable
limits for that detector, and cannot be brought back with
sensitivity adjustment (where applicable), replace the detector
head with an acceptable head. Send the removed head to
the nearest Siemens Industry, Inc. Authorized Service Center
for servicing.
CAUTION:
UNDER NO CIRCUMSTANCES IS THE
DETECTOR HEAD TO BE DISASSEMBLED. NO FIELD
REPAIRS SHOULD BE ATTEMPTED.
THE DETECTORS
ARE FACTORY REPAIRABLE ONLY.