Carrier 69NT40-541-505, Operation And Service Manual, Page: 122 / 143

T-368 7–30
Figure 7.31 R-134a Compressor Pressure and Motor Current Curves Vs. Ambient Temperature, Sheet 1
80
100
120
140
160
180
200
220
240
260
280
300
320
60 70 80 90 100 110 120
psig
(43.3) (37.8) (32.2) (26.7) (21.1) (15.6)
( C)
(Bar)
(5.5)
(6.9)
(8.3)
(9.7)
(11.0)
(12.4)
(13.8)
(15.2)
(16.6)
(19.3)
(20.7)
(22.0)
35 F (1.7 C)
Box
(17.9)
Note: Curves to be used as troubleshooting guide only for model series 69NT40 with
fresh air makeup vent closed, unit powered on 460VAC/60Hz and SMV 100% open.
Compressor Discharge 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)
Ambient Air Temperature
( F)
( C)
( F)
(48.9)
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