Barko 495B - SE, Service Manual

Page: 68 / 99

Service Manual Last Updated - 9/28/2016
495B SE (S)
68
AIR CONDITIONER MAINTENANCE CONTINUED...
130 F. condenser temp. = 200 PSIG*
* based on 30 MPH air flow.
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
45
50
55
60
65
70
75
80
85
90
91
92
All values rounded two places.
C
O
N
D
E
N
S
E
R
R
A
N
G
E
15.69
17.04
18.43
19.87
21.35
22.88
24.47
26.10
27.79
29.52
31.32
33.17
35.07
37.03
39.05
40.09
45.48
51.27
57.47
64.10
71.19
78.75
86.80
95.40
93
94
95
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
130
135
140
145
150
155
160
165
170
The numbers above represent boiling points for R-134a.
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.
Example:
90 F. ambient temp.
+40
Conditions will vary for different system configurations.
TEMP F. PSIG
R-134a Temperature Pressure Chart
E
V
A
P
O
R
A
T
O
R
R
A
N
G
E
TEMP F. PSIG
CHECKING/ADDING REFRIGERANT
Allow only certified personnel to service the heater/air conditioner system. The chart below shows relative
temperatures and pressures for the system.
Generally, for most Barko machines, 3 pounds of refrigerant is required for the system to operate properly. However,
use the chart below to determine the exact amount.
Older air conditioning equipment may contain R-12, a substance which harms public
health and environment by destroying ozone in the upper atmosphere. To remove
R-12 from the air conditioning system, use service equipment certified to meet the
requirements of S.A.E. J2209 or J1990.