4-18
g. Slip crimp fittings over dressed wires (keep wire
colors together). Make sure wires are pushed into crimp
fittings as far as possible and crimp with crimping tool.
h. Solder spliced wires with a 60% tin and 40% lead
Rosincore solder.
i.
Slide heat shrink tubing over splice so that both ends
of tubing cover both ends of crimp as shown in
Figure 4-22.
Sensor
Cable
Heat Shrink
Tubing (2)
Large Heat Shrink
Tubing (1)
Figure 4-22. Sensor and Cable Assembly
(RRS, RTS, SRS or STS)
j.
Heat tubing, preferably with a flameless heat gun. If
not available, a propane torch will work
(caution should
be taken not to burn the heat shrink tubing or wire
insulation
). Make sure all seams are sealed tightly against
the wiring to prevent moisture seepage.
k. Slide large heat shrink tubing over both splices and
shrink tubing and heat as in step j.
CAUTION
Do not allow moisture to enter wire splice area as
this may affect the sensor resistance.
l.
Secure sensor to unit and check sensor resistance as
detailed in section 4.23.1.
4.23.3 Checking Sensor (AMBS or DTS)
a. Turn unit OFF and disconnect power supply.
b. Refer to section 4.28 for removal of the Controller
module.
AMBS or DTS:
In the box there is a plug connector marked (EC) that
is connected to the Controller module, find the wires
marked AMBS or DTS, depending on which sensor
needs replaced. Follow that wire to the connector and
using the pins of the plug, measure the ohms resistance.
Readings are shown in Table 4-1.
4.23.4 Replacing Sensor (AMBS or DTS)
a. Turn unit power OFF and disconnect power supply.
b. Cut wires 25.4 cm (10 inches) from the back of the
mounting stud of the defective sensor and discard.
c. Cut one wire of the remaining two wires from step b
above, 25.4 mm (1.0 inch) shorter than the other wire.
d. Cut one replacement sensor wire back 25.4 mm (1.0
inch). (See Figure 4-23.)
e. Strip back insulation on all wiring 6.35mm (1/4 inch).
Sensor
25.4 mm (1.0 inch)
6.35mm (1/4 inch)
Mounting Stud
Figure 4-23. Sensor (AMBS or DTS)
f. Slide two small pieces of heat shrink tubing over each
wire before adding crimp fittings as shown in Figure 4-24.
g. Slip crimp fittings over dressed wires. Make sure
wires are pushed into crimp fittings as far as possible and
crimp with crimping tool.
h. Solder spliced wires with a 60% tin and 40% lead
Rosincore solder.
i.
Slide heat shrink tubing over splice so that both ends
of tubing cover both ends of crimp as shown in
Figure 4-24.
Sensor
Heat Shrink
Tubing (2)
Crimp Fitting
Crimp Fitting
Figure 4-24. Sensor and Wire Assembly (AMBS or DTS)
j.
Heat tubing, preferably with a flameless heat gun. If
not available, a propane torch will work
(caution should
be taken not to burn the heat shrink tubing or wire
insulation
). Make sure all seams are sealed tightly against
the wiring to prevent moisture seepage.
CAUTION
Do not allow moisture to enter wire splice area as
this may affect the sensor resistance.
k. Secure sensor to unit and check sensor resistance as
detailed in section 4.23.3.
4.24 SUCTION SOLENOID VALVE
a. Replacing the Coil
NOTE
The coil may be replaced without removing the
refrigerant.
1. Disconnect leads by unplugging the connector.
Remove snap cap or locknut. Lift off coil.
(See
Figure 4-25)
2. Verify coil type, voltage and frequency of old and
new coil. This information appears on the coil housing.
b. Replacing Valve Internal Parts --- Alco
(See Figure 4-25)
1. Pump down the unit. (Refer to section 4.3.)
2. Remove snap cap, and coil.
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