26-7
®
SERVICE- HVAC SYSTEM
(continued...)
Generally for most Barko machines, 3 pounds of refrigerant is required for the system to operate
properly.
Use the chart below to determine the exact amount.
1.2.4 Alternate A/C Charging Procedure
1) Perform steps 1- 20 on previous page.
2) With an infrared thermometer measure condenser
tube temperatures from refrigerant inlet to refrigerant
outlet (typically from top to bottom).
3) The temperature will be highest at the refrigerant
inlet (superheated region). Then the temperature will
decrease to the saturation temperature of the
refrigerant at the operating discharge pressure
(saturation or condensing temperature). Near the
outlet of the condenser the temperature should once
again decrease by roughly (10º to 14° F) (6 to 8°C)
below the saturation temperature (sub-cooled
region).
4) If the refrigerant at the outlet of the condenser is
not sub-cooled by (10º to 14° F) (6 to 8°C) below the
saturation temperature, continue to add vapor
refrigerant in small increments through the blue (low
side) charge port.
5) When (10º to 14° F) (6 to 8°C) of condenser outlet
sub-cooling is reached, verify proper a/c operation.
6) Document total refrigerant amount added to
system and apply appropriate label near compressor
stating refrigerant charge amount.
EVAPORATOR:
pressures represent gas temperatures inside the
coil and not the coil surfaces. Add to temperature
for coil air-off temperatures (8 - 10f.)
CONDENSER:
temperatures are not ambient temperatures. Add
to ambient (35 - 40 F.) for proper heat transfer,
then refer to pressure chart.
Older air conditioning equipment may contain R-12, awhich harms the environment
by destroying ozone. To remove R-12 from the air conditioning system, use service
equipment certified to meet the requirements of S.A.E. J2209 or J1990.
°F
°C
HFC 134a CFC-12
°F
°C
HFC 134a CFC-12
-60
-51.1
21.8
19.0
55
12.8
51.1
52.0
-55
-48.3
20.4
17.3
60
15.6
57.3
57.7
-50
-45.6
18.7
15.4
65
18.3
63.9
63.8
-45
-42.8
16.9
13.3
70
21.1
70.9
70.2
-40
-40.0
14.8
11.0
75
23.9
78.4
77.0
-35
-37.2
12.5
8.4
80
26.7
86.4
84.2
-30
-34.4
9.8
5.5
85
29.4
94.9
91.8
-25
-31.7
6.9
2.3
90
32.2
103.9
99.8
-20
-28.9
3.7
0.6
95
35.0
113.5
108.3
-15
-26.1
0.0
2.4
100
37.8
123.6
117.2
-10
-23.3
1.9
4.5
105
40.6
134.3
126.6
-5
-20.6
4.1
6.7
110
43.3
145.6
136.4
0
-17.8
6.5
9.2
115
46.1
157.6
146.8
5
-15.0
9.1
11.8
120
48.9
170.3
157.7
10
-12.2
12.0
14.6
125
51.7
183.6
169.1
15
-9.4
15.0
17.7
130
54.4
197.6
181.0
20
-6.7
18.4
21.0
135
57.2
212.4
193.5
25
-3.9
22.1
24.6
140
60.0
227.9
206.6
30
-1.1
26.1
28.5
145
62.8
244.3
220.3
35
1.7
30.4
32.6
150
65.6
261.4
234.6
40
4.4
35.0
37.0
155
68.3
279.5
249.5
45
7.2
40.0
41.7
160
71.1
298.4
265.1
50
10.0
45.3
46.7
165
73.9
318.3
281.4
EVAPORATOR RANGE
CONDENSER RANGE
PRESSURE TEMPERATURE CHART
PSIG
PSIG
Temperature
Temperature
WARNING
!
Fig-3 shows a typical A/C Manifold
Gauge set.
Fig-3
05/31/2019
Updated
SERVICE
Summary of Contents for 830B
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