Carrier 69NT40-561-300, Operation And Service Manual

Page: 153 / 174

7–37 T-365
7.25.2 Sensor Replacement
WARNING
!
Always turn OFF the unit circuit breaker (CB-1) and disconnect main power supply before
removing electrical parts.
1. Turn unit power OFF and disconnect power supply
NOTICE
Include white date code label when cutting out and removing defective sensors. The label
could be required for warranty returns.
2. Cut cable. Slide the cap and grommet off a bulb type sensor and save for reuse. Do not cut the grommet .
3. Cut one wire of existing cable 40 mm (1-1/2 inches) shorter than the other wire.
4. Cut replacement sensor wires (opposite colors) back 40 mm (1-1/2 inches). (See Figure 7.22 .)
5. Strip back insulation on all wiring 6.3 mm (1/4 inch).
Figure 7.22 Sensor Types
6. Slide a large piece of heat shrink tubing over the cable, and place the two small pieces of heat shrink tubing,
one over each wire, before adding crimp fittings as shown in Figure 7.23 .
Figure 7.23 Sensor and Cable Splice
7. If required, slide the cap and grommet assembly onto the replacement sensor.
8. Slip crimp fittings over dressed wires (keeping wire colors together). Make sure wires are pushed into crimp
fittings as far as possible and crimp with crimping tool.
9. Solder spliced wires with a 60% tin and 40% lead Rosincore solder.
10.Slide heat shrink tubing over each splice so that ends of tubing cover both ends of crimp as shown in Figure
7.23 .
11. Heat tubing to shrink over splice. Make sure all seams are sealed tightly against the wiring to prevent mois-
ture seepage.
Sensor
40 mm (1 1/2 in),
2 or 3 wires as required
Mounting Stud Type
6.3 mm (1/4 in)
Bulb Type
6.3 mm (1/4 in)
Sensor
Sensor (Typical)
Cable
Large Heat Shrink Tubing (1)
Heat Shrink Tubing, 2 or 3 as required