Chapter 3. OPERATOR'S MAINTENANCE INSTRUCTIONS

TM 3-6665-225-12

CHAPTER 3

OPERATOR'S MAINTENANCE INSTRUCTIONS

Section I. INSTALLATION

(4) Remove protective cap (8) of BB501/U

31. General

battery receptacle.

The operator is authorized to install the M43

(5) Plug connector (7) of M168 cable into

detector unit, M42 alarm unit, M229 refill kit,

receptacle on top of BB501/U battery (9) after

M10 power supply, and batteries. Prior to install-

squeezing two spring clips on sides of connector

ing an item, the operator must inspect not only

(7).

the item, but the equipment in which it is to be

( 6 ) With keyways alined, firmly push

installed.

connector (7) onto battery receptacle and release

32. Fixed Emplacement Installation

spring clips to lock connector in place.

(7) Perform setup and operation procedures

Operator's installation p r o c e d u r e s at fixed

(para 2-9).

emplacement entail connecting the M43 detector

c. M43 Detector Unit Employing M10 Power

unit to a power source and to one or more M42

Supply. The fixed emplacement arrangement (fig.

alarm units.

3-2) of the alarm system uses an M10 power

a. M43 Detector Unit Employing BA3517/U

supply (1) as a power source. The M10 power

Battery. T h e number of missions that a

supply requires an input voltage of 115 or 220

BA3517/U battery can be used is determined by

volts at a frequency of 50, 60, or 400 hertz. A

the air temperature in which it is required to

standby battery (either the BA3517/U or the

operate. Refer to table 1-2 to determine the maxi-

BB501/U employed with the M43 detector unit) is

mum number of allowable 12-hour missions for a

connected to the M10 power supply to auto-

BA3517/U battery in a specific temperature.

matically provide power to the M43 detector unit

(1) Perform applicable preoperation pro-

in the event of a power failure. If the M10 power

cedures (para 2-6) and pre-startup procedures

supply output voltage decreases to less than 18

(para 2-7).

volts, a relay in the M10 power supply connects

(2) Attach BA3517/U battery (2, fig. 3-1) to

standby battery power to the M43 detector unit.

bottom of M43 detector unit (1) by inserting catch

(1) Be sure that applicable preoperation pro-

(5) into slot in metal strap (4).

cedures (para 2-6) and pre-startup procedures

(3) Insert clamping catch (3, fig. 1-7) onto

( p a r a 2-7) have been performed.

other catch striker on the opposite side of M43

detector unit and lock.

NOTE

(4) Perform startup and operation pro-

Make sure that M10 power supply

cedures (para 2-9).

power switch (3, fig. 2-2) is in OFF

b. M43 Detector U n i t Employing M253

position.

Winterization Kit. An M253 winterization kit,

( 2 ) Connect DETECTOR POWER cable

consisting of two BB501/U batteries and one

(W2) (3, fig. 3-2) to M43 detector unit 24 VDC

M168 cable, is used to supply battery power when

INPUT connector (2).

the M43 detector unit is used in temperatures be-

(3) Connect STANDBY BATTERY cable (4)

tween 20F. and -40F. Refer to table 1-2 to

to BA3517/U battery or to M168 cable which is

determine the maximum number of allowable

connected to BB501/U battery.

continuous 12-hour missions for a BB501/U bat-

NOTE

tery before recharging.

Refer to table 1-2 to determine which

(1) Perform preoperation procedures (para

battery is to be used as power source.

2-6) and pre-startup procedures (para 2-7).

(4) Place M10 power supply power switch (3,

(2) Turn protective cap (4, fig. 2-7) counter-

fig. 2-2) to proper input voltage position.

clockwise and pull it from connector (3) of M168

(5) Rotate annunciator (8) fully clockwise

cable (5).

and then fully counterclockwise.

(3) Pull protective cap (6) from connector (7)

(6) Press M43 detector unit HORN VOL-

of M168 cable.

3-1

234-774