JOHNSON CONTROLS
73
FORM 160.67-O2
ISSUE DATE: 10/9/2020
6
SECTION 6 - MAINTENANCE
RENEWAL PARTS
For any required Renewal Parts, refer to YORK Renew-
al Parts Unit Components Manual 160.67-RP1.
CHECKING SYSTEM FOR LEAKS
Leak Testing During Operation
The refrigerant side of the system is carefully pressure
tested and evacuated at the factory.
After the system has been charged, the system should
be carefully leak tested with a R-134a compatible leak
detector to be sure all joints are tight.
If any leaks are indicated, they must be repaired im-
mediately. Usually, leaks can be stopped by tighten-
ing flare nuts or flange bolts. However, for any major
repair, the refrigerant charge must be removed. (See
Handling Refrigerant For Dismantling And Repairs on
page 76 in this Section.)
EVACUATION AND DEHYDRATION OF UNIT
FIGURE 18 - EVACUATION OF CHILLER
LD09698
CONNECT TO GAUGE
CONNECTION ON THE
CONDENSER
OR EVAPORATOR
VACUUM PUMP
COMPRESSOR
OIL COOLER
THERMISTOR
VACUUM GAUGE
NOTES: PSIG = Lbs. per sq. in. gauge pressure
= Pressure above atmosphere
PSIA = Lbs. per sq. in. absolute pressure
= Sum of gauge plus atmospheric pressure
TABLE 4 - SYSTEM PRESSURES
*Gauge Absolute
Boiling Temperatures of
Water °F
Inches of Mercury
(HG) Below One
Standard Atmosphere
PSIA
Millimeters of Mercury
(HG)
Microns
0 14.696 760. 760,000 212
10.24" 9.629 500. 500,000 192
22.05" 3.865 200. 200,000 151
25.98" 1.935 100. 100,000 124
27.95" .968 50. 50,000 101
28.94" .481 25. 25,000 78
29.53" .192 10. 10,000 52
29.67" .122 6.3 6,300 40
29.72" .099 5. 5,000 35
29.842" .039 2. 2,000 15
29.882" .019 1.0 1,000 +1
29.901" .010 .5 500 -11
29.917" .002 .1 100 -38
29.919" .001 .05 50 -50
29.9206" .0002 .01 10 -70
29.921" 0 0 0
*One standard atmosphere = 14.696 PSIA
= 760 mm Hg. absolute pressure at 32°F
= 29.921 inches Hg. absolute at 32°F
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