Figure 2-8. RAINSHIELD assembly application.

TM 3-6665-225-12

(19) below.

flowmeter ball (6) is in the blue zone (8), proceed to

(19) Press in hand crank (2, fig. 2-1) and release

(19) below. If flowmeter ball (6) indicates no airflow,

it.

proceed to (17) below. If flowmeter ball (6) indicates

NOTE

low airflow, proceed to (18) below.

Keep hand crank in the down position, not

NOTE

pressed in.

Adjust HORN VOL-BATTERY TEST knob

(20) After 10 minutes of operation at normal

(6, fig. 2-1) for low volume. Position M42

airflow, press and rotate ZERO ADJUST knob (5)

alarm unit selector switch (8, fig. 1-5) to

until meter (1) indicates in ZERO ADJUST zone

HORN OFF or disconnect one wire from

(blue). Repeat at 10-minute intervals until meter

M43 detector unit REMOTE binding post

reading is stable.

(17, fig. 1-2).

(21) Disconnect power source from the 24 VDC

(17) If no airflow is indicated, press ZERO

INPUT connector (11, fig. 1-2) of M43 detector unit.

ADJUST knob (5, fig. 2-1), rotate it fully clockwise,

Position M42 alarm unit selector switch (8, fig. 1-5)

and release it. Horn must sound. Check airflow

to HORN ON or reconnect wire to M43 detector

every 2 minutes by pressing ZERO ADJUST knob

unit REMOTE binding post (17, fig. 1-2).

(5) and observing FLOWMETER (2, fig. 2-6). When

(22) Remove protective cap from the sensitivity

bail (6) rises in FLOWMETER, indicating low air-

check bottle (6, fig. 1-6). Unscrew AIR FILTER plug

flow, press ZERO ADJUST knob (5, fig. 2-1) and

(4, fig. 2-4) and remove air filter (3).

rotate it fully counterclockwise and proceed to (18)

(23) Invert sensitivity check bottle and, while

below.

holding dropper tip 1/2 inch over center of black

(18) If low airflow is indicated, let pump as-

side of filter material (2), allow two drops of

sembly operate until correct airflow (blue zone) is

indicated (less than 30 minutes). Then proceed to

Figure 2-8. RAINSHIELD assembly application.

horn (3) must sound, M42 alarm unit loudspeaker

solution to fall on the filter.

(5, fig. 1-5) must sound, and ALARM-RED indicator

(24) Immediately replace air filter (3) in M43

(3) must flash.

detector unit and secure AIR FILTER plug (4). Re-

NOTE

place cap on sensitivity check bottle.

If M43 detector unit horn sounds in less

(25) Connect power source to 24 VDC INPUT

than 15 seconds, disconnect power source

connector (11, fig. 1-2) of M43 detector unit.

and return unit to organizational mainte-

(26) Immediately press and hold ZERO AD-

nance through your supervisor.

JUST knob (5, fig. 2-1) for 5 seconds and release it.

Within 15 seconds to 5 minutes, M43 detector unit

Change 2

2-13