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TM 3-6665-225-12
Figure 2-4. Installing air filter.
(5) Install and tighten AIR FILTER plug
(4).
2-8. Installing Equipment as a System
The remaining procedures require that the alarm
system be installed in accordance with the appro-
priate instructions in paragraphs 3-1 and 3-4.
NOTE
Do not connect power to M43 detector
unit 24 VDC INPUT connector (11, fig.
1-2) until instructed to do so.
29. Startup and Operation
These procedures start and place the alarm
Figure 2-5, AIR INLET assembly.
system into operation.
unit. M43 detector unit horn (2) and M42 alarm
a. Remove AIR OUTLET cap (15, fig. 1-2)
unit loudspeaker (5, fig. 1-5) must sound.
from AIR OUTLET port. Remove cover (10) from
e. Position M42 alarm unit selector switch (8,
24 VDC INPUT connector (11).
fig. 1-5) to HORN OFF or disconnect one wire
b. Check that AIR INLET assembly is in
from M43 detector unit REMOTE binding post
CLOSED position (fig. 2-5, A). Unscrew plug (1).
(17, fig. 1-2). Adjust M43 detector unit HORN
c. Press the ZERO ADJUST knob (5, fig.
VOL-BATTERY TEST knob (6, fig. 2-1) for
2-1), rotate it fully clockwise, and release it.
desired level.
NOTE
f. Press ZERO ADJUST knob (5), rotate it
Notify personnel within audible range
fully counterclockwise, and release it. Horn must
stop sounding and pump assembly must operate.
that alarm system is to be tested.
NOTE
g. Press HORN VOL-BATTERY TEST knob
If any startup tests fail, refer to table
(6). Meter (1) must indicate 24 minimum; release
3-3 for operator's troubleshooting infor-
knob.
mation.
h. Remove FLOWMETER (3, fig. 1-3) from
handle (2). Insert and twist FLOWMETER
d. Connect power source connector to 24 VDC
firmly clockwise into top of AIR INLET assembly
INPUT connector (11, fig. 1-2) of M43 detector
2-6

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