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8-29
62-11039
8.18.2 To Measure Superheat
NOTE
The expansion valve and bulb location are
shown in Figure 8--31.
a. Pull loose the Presstite insulation from one end of the
expansion valve bulb.
b. Loosen one TXV bulb clamp and make sure area un-
der clamp (above TXV bulb) is clean.
c. Place thermocouple above (parallel) TXV bulb and
then secure loosened clamp making sure both bulbs
are firmly secured to suction line as shown in
Figure 8--31. Use Presstite insulation to completely
cover both bulbs.
1
2
3
4
5
1. Suction Line
2. TXV Bulb Clamp
3. Nut and Bolt (Clamp)
4. Thermocouple
5. TXV Bulb
Figure 8--31. Thermostatic Expansion Valve
Bulb and Thermocouple
d. Connect an accurate gauge to the 1/4” port on the
suction service valve.
e. Run unit until stabilized. Set controller 10
_
F (5.5
_
C)
below box temperature.
f. From the temperature/pressure chart, determine the
saturation temperature corresponding to the evapo-
rator outlet pressure.
g. Note the temperature of the suction gas at the ex-
pansion valve bulb.
h. Subtract the saturation temperature determined in
Step f. from the average temperature measured in
Step g. The difference is the superheat of the suction
gas.
8.19 CHECKING AND REPLACING HIGH PRES-
SURE CUTOUT SWITCH (HPS)
8.19.1 Replacing High Pressure Switch
a. Put gauges on the compressor.
b. Pump down compressor to 0--5 psig (0 to 0.3 Bar)
suction pressure.
(Refer to Section 8.10.1.)
Frontseat both suction and discharge service valves
to isolate compressor.
c.
Slowly
equalize compressor pressure through the
service valve gauge ports.
d. Recover refrigerant remaining in compressor.
e. Disconnect wiring from defective switch, and remove
old switch. The HPS is located on the top cylinder
head (See Figure 8--22).
f. Install new cutout switch after verifying switch set-
tings. (Refer to Section 8.19.2)
g. Evacuate and dehydrate the compressor. (Refer to
Section 8.12
)
h. Check unit operation by running Pretrip (Refer to Sec-
tion 3.5).
Summary of Contents for VECTOR 1800 MT
Page 1: ......
Page 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
Page 19: ...1 5 62 11039 1 3 SAFETY DECALS ...
Page 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
Page 21: ...1 7 62 11039 ...
Page 303: ...10 1 62 11039 ...
Page 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
Page 311: ...10 9 62 11039 FROM PREVIOUS SHT ...