Water Supply Connection

TM 5-6640-213-14

b. Water Supply Connection. Attach a garden hose to the water

supply connection. Before turning on the water to supply the labora-

tory, make sure that the reservoir gate valve (15, fig. 2-3) is

closed.

c. Waste Drain Connections. Open the access door of the air

conditioner. Uncoil the plastic tubing and attach it to the drain.

Drop the tubing down outside the shelter to assure complete drainage

of all condensate away from the air conditioning unit and the labora-

tory.

Connect a length of garden hose to the sink drain and route it

to a drainage ditch or to a previously prepared sump.

Utility Equipment and Automatic Alarm System.

(1)

Utility Equipment and Electrical System.

The air in the laboratory must be purged of

combustion or toxic vapors before allowing

personnel to enter. The exhaust (air-purging)

system will operate for ten minutes. All other

electrical circuits in the lab are inoperative

during the purging cycle, but will activate

automatically at its completion.

(a) Description. The electrical system (fig. 1-7)

provides services to all laboratory electrical components, lights and

utility receptacles. The system is powered by a 15 kw, 60 Hz; 120-

208, vac generator through a four-conductor power cable. All of the

major circuits have either circuit breaker or fuse protection against

overcurrent. The electrical system includes an air-purging system

and a combustible gas alarm system to assure the safe operation of

the laboratory.

(b)

Operation.

1. Momentarily depressing the main power switch

S2 to ON causes relay K1 to be energized. Contacts KIA close,

sealing in K1. Contacts KIB close, starting the fan and timer.

2. After 10 minutes, timer contacts 7 and 8

close, energizing relay K2 and contactor K3. Contacts K3A, K3B and

K3C close, providing power to circuit breakers CB2 through CB6.

(These circuit breakers provide power to the laboratory internal

electrical components). Contacts K2A close, removing fan from KIB

control.

NOTE

If fan local control switch S3 is OFF, the fan will

be deenergized at this time. The electrical system

is now in the normal mode of operation.

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