40 
BULLETIN 98, U. S. DEPARTMENT OF AGRICULTURE. 
17 illustrates a general arrangement of a plant of this character with 
all the necessary accessories. 
OPERATING ABSORPTION MACHINE. 
To start. — (1) Start water circulating through machine; (2) start 
brine pump, making sure that the brine is circulating through cooler; 
(3) turn steam on gradually (steam should never be shut off entirely) ; 
(4) open gas line between cooler and absorber; (5) open weak-liquor 
valve, setting it at the usual running position; (6) start ammonia 
pump; (7) when generator pressure is about that usually carried, open 
valve in the dry gas line slowly, allowing the gas to enter the con- 
denser; (8) open and set expansion valve. 
To stop. — (1) Close steam valve on generator almost entirely 
(steam should never be shut off entirely); (2) close expansion valve; 
(3) shut down ammonia pump; (4) close weak-liquor valve; (5) shut 
Fig. 17.— General arrangement of absorption refrigerating machine. 
off cooler and absorber gas line; (6) close valve in dry gas line to con- 
denser; (7) shut down brine pump; (8) shut off water supply. 
The foregoing suggestions are of a general nature only and should 
be considered as such. The purpose for which a plant is used and 
the character of the trade supplied have considerable bearing on its 
operation and management; consequently the engineer in charge 
must determine on the best methods to employ in order to get the best 
results. 
Figure 18 is intended, to show, diagrammatic ally, the apparatus 
which is common to both the compression and absorption systems 
of refrigeration. As a matter of fact there are a number of accessories 
required in both systems for their successful operation which are not 
shown in the elementary diagram, as will be noted by referring to fig- 
ures 14 and 17, which show the complete equipment of the two 
systems. 
