Toshiba LF664 Instruction Manual page 22

(3) Flow Direction
Install the detector in accordance with the flow direction arrow on the detector.
(4) Full Pipe Condition
Design an upright pipe run (Figure 4.5) or enough water head (Fig. 4.6) at the downstream detector
outlet if there is a possibility of the detector pipe being emptied.
Figure 4.5 Detector with an upright pipe run at the downstream outlet
Figure 4.6 Detector with enough water head at the downstream outlet
Upright pipe run
Detector
Detector
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