6-39a
T-294-01
--6
--4
--2
0
2
4
6
8
10
12
14
60
70
80
90
100
110
120
NOTE
Curves to be used as troubleshooting guide only for model series 69NT40-511-200 to 69NT40-511-299
with fresh air makeup vent closed, unit powered on 460 VAC/60hz and SMV 100% open.
Liquid Line Process Tube Pressure Versus Ambient Air Temperature at Stable Box Temperature
80
100
120
140
160
180
200
220
240
260
280
300
320
60
70
80
90
100
110
120
Ambient Air Temperature
psig
(48.9)
(43.3)
(37.8)
(32.2)
(26.7)
(21.1)
(15.6)
(Bar)
0
_
_
_
_
F (--17.8
_
_
_
_
C) Box
(5.5)
(6.9)
(8.3)
(9.7)
(11.0)
(12.4)
(13.8)
(15.2)
(16.6)
(19.3)
(20.7)
(22.0)
(17.9)
_
_
_
_
F
(
_
_
_
_
C)
35
_
_
_
_
F (1.7
_
_
_
_
C) Box
Ambient Air Temperature
psig
_
F
(Bar)
(.97)
(.83)
(.69)
(.55)
(.41)
(.28)
(.14)
(0)
(--.14)
(--.28)
(--.41)
0
_
_
_
_
F (--17.8
_
_
_
_
C) Box
(48.9)
(43.3)
(37.8)
(32.2)
(26.7)
(21.1)
(15.6)
(
_
_
_
_
C)
35
_
_
_
_
F (1.7
_
_
_
_
C) Box
Compressor Suction Pressure Versus Ambient Air Temperature at Stable Box Temperature
L
iq
u
id
L
in
e
P
ro
cess
Tu
b
e
P
ressu
re
Co
mp
resso
r
S
u
ct
io
n
P
ressu
re
Figure 6-37. R-134a Compressor Pressure Versus Ambient Temperature
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