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Shielded cable should be used to provide additional protection against electrical obstacles.

It is not recommended to place fire alarm system cables in common cable channels with

other electrical wires.

6.2 It is not recommended to mount the units in places where the gases, vapour and

aerosols can cause corrosion. During repair works additional cover should be used to protect units

against debris.

6.3 The detector's sensitive zone is the infrared beam between the receiver and transmitter.

The sensitive zone diameter is determined by the optical system window. The sensitive zone

should not be overlapped by any objects.

6.4 The direct light exposure of the optical system window is not allowed.

6.5 Units of detectors should be installed to a rigid base (main wall, column, rafter etc.) in

an accessible place.

Note: It is allowed to install several detectors in one room allocating sensitive zones

parallel to each other. When the distance between parallel optical axes of sensitive zones is less

than 3 meters, different detector units should be mounted on the same wall: transmitter, receiver,

transmitter and so on.

6.6 Mark out the transmitter and receiver mounting places according to Figure 3.

6.7 Fix the receiver and transmitter.

6.8 Connect to a control panel according to Figure 6.

7 ALIGNMENT AND CHECKING FOR PROPER OPERATION

7.1 Adjustment

7.1.1 Loose Rx and Tx bracket attaching screws, direct the optical system windows to

each other.

7.1.2 Tighten screw joints with force ensuring the fixation of the units' chosen position

and possibility of the following adjustment.

7.2 Calibration

7.2.1 The RANGE switch on Rx unit sets the distance between Tx and Rx. The RANGE

switch should be set to «0» if the distance between the units is up to 30 m. When the distance is

greater than 30 m - to «1» position.

7.2.2 Set the CALIBRATION switch on Rx to «1» position.

7.2.3 Turn the fire alarm system on. The voltage drop on the EUI-1 contacts «7» and «8»

should not be less than 8 V. In 10 sec after energizing both LEDs will simultaneously flash on Tx

every 1 sec.

Depending on the adjustment precision, the following combinations of optical indication

on Rx are possible:

- bright flashes every 1sec when high level of optical signal has been detected;

- low brightness flashes of the left indicator every 1 sec and right indicator is off when

normal level of optical signal has been detected;

- bright flashes of the right indicator and low brightness flashes of the left indicator

every 1 sec when low level of optical signal has been detected;

- bright flashes of both indicators every 0.5 sec when adjustment of the receiver and

transmitter has been made incorrectly

- flashes at different intervals (0.5 sec and 2 sec), and a control panel will fix open-

circuit in alarm loop when the electric connection between the receiver and transmitter is absent.

7.2.4 If the optical signal level is high it is necessary to attain the normal signal level by

slowly turning the calibration regulator counter-clockwise. It is allowed to change the RANGE

switch from «1» to «0» if necessary.

7.2.5 If the optical signal level is normal it is necessary to set the high level of signal

slowly turning the calibration regulator clockwise and then to set again the normal level of signal

slowly turning the calibration regulator counter-clockwise.