6
DXXXX
F.
Remove the sensing chamber cover.
G.
Clean the sensing chamber by vacuuming or blowing out dust
and particles.
H.
Replace the sensing chamber cover, aligning the arrow on the
cover top with the arrow on the printed circuit board.
I.
Replace the screen by placing the screen assembly over the
sensing chamber cover and twisting until it snaps into place.
J.
Replace the housing by aligning the two triangular slots on the
base with their counterparts on the housing. Gently press the
housing until it locks in place. Check to make sure that the
thermistors are in the upright position.
K.
Replace the batteries (verify correct polarity).
L.
Reinstall the detector.
M.
Notify the proper authorities that the system is back in
operation.
NOTE:
Test the detector to make sure that the batteries are
inserted correctly.
NOTE:
If nuisance alarms keep occurring, check whether the
detector's location is adequate (see Para. 4.1 and 4.2). Relocate
the unit if it is not located properly. Clean as described above.
6.
ROUTINE TESTING
The detector should be tested weekly and also whenever you
suspect that it does not go into alarm. Push the test switch firmly
with a sharp object until the horn sounds (it may take up to 2.5
seconds). Also verify that the control panel responds to the
transmitted fire alarm. If the detector fails, have it repaired or
replaced immediately, to ensure that it works properly.
WARNING: Never use an open flame of any kind to test your
detector. You may set fire to damage the detector as well as
your home. The built-in test switch accurately tests all
detector functions, as required by Underwriters' Labora-
tories. This is the only correct way to test the unit.
NOTE:
If the alarm horn produces a loud continuous sound when
you are not testing the unit, this means the detector has sensed
smoke or combustion particles in the air. Verify that the alarm is a
result of a possible serious situation, which requires your
immediate attention.
•
The alarm could be caused by a nuisance situation. Cooking
smoke or a dusty furnace, sometimes called "friendly fires" can
cause the alarm to sound. If this happens, open a window or
fan the air away to remove the smoke or dust. The alarm will
turn off as soon as the air is completely clear.
CAUTION:
Do not disconnect the battery from the detector. This
will remove your protection from fires.
•
If the alarm horn begins to chirp once every 40 seconds, this
means that the detector's battery is weak. Install a new battery
immediately. Keep fresh batteries on hand for this purpose.
7. STATEMENTS OF COMPLIANCE
The 315 MHz version of this device complies with Part 15 of the
FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This
device must accept any interference received, including
interference that may cause undesired operation.
WARNING! Changes or modifications to this unit not
expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment
The digital circuit of this device has been tested and found to
comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in residential
installations. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference
to radio and television reception. However, there is no guarantee
that interference will not occur in a particular installation. If this
device does cause such interference, which can be verified by
turning the device off and on, the user is encouraged to eliminate
the interference by one or more of the following measures:
– Re-orient or re-locate the receiving antenna.
– Increase the distance between the device and the receiver.
– Connect the device to an outlet on a circuit different from the
one which supplies power to the receiver.
– Consult the dealer or an experienced radio/TV technician.
At 315 MHz the product complies with FCC and UL requirements.
APPENDIX A. THE VISONIC LTD. POWERCODE SYSTEM
The PowerCode Message Format
PowerCode transmitters transmit 3 data bursts at random intervals, with 6 repetitions of the same message in each burst (Fig. A1). This
redundancy improves the probability of reception.
Note:
Periodic supervision messages are an exception to this rule - they consist of a single 9-message burst.
Figure A1. Anti-Collision Transmission Sequence