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8.20.3 Replacing Compressor Discharge Pressure
Transducer
a. Pump down the compressor. (Refer to Section
8.10.1.) Frontseat both suction and discharge ser-
vice valves to isolate compressor.
b. Equalize compressor discharge and suction pres-
sures through the service valve gauge set.
c. Disconnect wiring from defective transducer and re-
move. The CDP is located at the side of the center
compressor cylinder head. (See Figure 2-2)
WARNING
The Compressor Discharge Pressure
Transducer does not have a Schrader valve
in the connecting fitting. Any discharge
pressure remaining in the compressor will
be released when removing the CDP.
d. Calibrate new discharge transducer before installing
in compressor. (Refer to Section 8.20.1)
e. Install new discharge transducer, being careful to ob-
tain the correct transducer for your unit. R-404A
CDPs have a red dot on the side.
NOTE
Place unit in Service Mode before performing
the following operations on the unit. Refer to
Section 5.2
f. Evacuate and dehydrate the compressor. (Refer to
Section 8.12.
)
g. Check unit operation by running Pretrip (Refer to Sec-
tion 3.5).
8.21 COMPRESSOR SUCTION PRESSURE TRANSDUCER (CSP AND EVOP)
LOW RANGE PRESSURE TRANSDUCER
-- CSP/EVOP
O
U
TPU
T
VO
LT
A
G
E
WITH
5V
SU
PPL
Y
(VO
LT
S)
PRESSURE (PSIG)
8.21.1 Calibrating Compressor Suction Pressure
Transducer
The Compressor Suction Pressure Transducer (CSP)
has a range of --14.7 to100 PSIG (--1 to 6.8 Bar).
Because of this much smaller range, calibration of the
CSP is not required.
8.21.2 Testing Compressor Suction Pressure
Transducer
a. Verify that the wiring to the transducer is correct.
(See wiring diagram, Section 10).
b. Power up the transducer circuit. Place unit into PC
Mode (Refer to Section 5.1), or place unit in Manual
Start Mode.
c. Check Voltage to transducer. Voltage reading be-
tween A (negative) and B (positive) should be 5.0
VDC.
d. Check wire resistance between C (output to micro-
processor) and 1MP6.
e. Place +5.0 VDC on transducer terminal B and --5.0
VDC on transducer terminal A. Test voltage between
B and C. The reading should be as shown in table be-
low.
Table 8-6. Compressor Suction Pressure Transducer
PSIG
Bar
Voltage
PSIG
Bar
Voltage
PSIG
Bar
Voltage
--10
--0.7
0.7
30
2.0
2.1
70
4.8
3.5
--5.0
--0.3
0.8
35
2.4
2.2
75
5.1
3.6
0.0
0.0
1.0
40
2.7
2.4
80
5.4
3.8
5.0
0.3
1.2
45
3.1
2.6
85
5.8
4.0
10.0
0.7
1.4
50
3.4
2.8
90
6.1
4.1
15.0
1.0
1.5
55
3.7
2.9
95
6.5
4.3
20.0
1.4
1.7
60
4.1
3.1
100
6.8
4.5
25.0
1.7
1.9
65
4.4
3.3
Содержание VECTOR 1800 MT
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Страница 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
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Страница 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
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Страница 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
Страница 311: ...10 9 62 11039 FROM PREVIOUS SHT ...