Connect the electrical power cable, stored
2-1. Preparation of Laboratory for Use.
beneath the trailer, to the outside power source and to
a. Inspect the interior of the laboratory for broken
the receptacle (fig. 1-3) located on the left side of the
glassware and other equipment damage, Inspect the
exterior of the semitrailer for any visible damage
sustained in transit. If trailer is damaged, fill in DD Form
250 (Material Inspection and Receiving Report) and
process in accordance with current requirement.
b. Using the sight levels located at each end of the
semitrailer, make certain the laboratory is leveled
power circuit breakers in OFF
position. Do not enter any trailer
compartment before purging van of
Some of the test apparatus may be
c. Before initial entry into the van, operate the van
adversely affected so that they are either
purging blowers according to instructions on instruction
inoperable or give incorrect readings if
plate adjacent to power entry receptacle and timer as
the laboratory is not leveled
Purge the laboratory for a minimum
of 10 minutes before entry, after a
information regarding warnings and
shutdown period of 2 or more hours.
(1) Open the two vent covers, identified as
PURGE, DUCT ONE, on the forward sidewall of the van
roadside. Open one vent cover, identified as PURGE,
c. Supply power to the laboratory.
DUCT TWO, on the forward right (curbside) sidewall of
d. Attach a drain hose to the air conditioner
condensate pipe. Operate the air conditioner and make
(2) Open door of timer housing.
certain that the fan is rotating in the proper direction.
(3) Turn clock dial clockwise until 20 minutes is
Refer to TM 5-4120-295-15.
indicated on dial.
e. Inspect each item of equipment and supply for
(4) Do not enter van until red light goes off. The
damage. Remove all shipment retainer brackets and
red light indicates that the van interior has been purged
of explosive vapors.
f. Supply water to the laboratory by manually filling
(5) If the warning light fails to illuminate, check
the water tank or by attaching a water pipe to the inlet at
bulb and connection to timer assembly.
the front roadside. Make certain the incoming pressure
d. Enter the rear compartment. Turn on the main
does not exceed 70 psi (31.8 kg/sq cm).
power circuit breakers.
g. Connect a length of garden hose to the sink drain
e. Turn on necessary lights.
connection and route the hose to a drainage ditch or to a
f. Check the gages on laboratory compartment
previously prepared sump.
control panel (fig. 1-4) for proper line voltage and current
2-2. General Operating Instructions.
g. Operate the heater and air conditioner according
to instructions in paragraphs 2-7 and 2-8.
a. Remove the stepladders from the rack. Place
h. Check water supply in tank located in utility
one three-step ladder at the rear door, the other three-
compartment. Replenish if necessary.
step ladder at the laboratory door, and the four-step
i. Turn on water pump (or connect outside water
ladder at the utility compartment door.
source, if available), vacuum pump, and compressor if
necessary. Check compressed air and vacuum pressure
gages on control panel.