Visonic Inc. MCT430 User Manual

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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. 

 

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.  

• 

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. 

• 

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.

 

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. 

 

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.