TM 10-8145-222-23
0049
REPLACE
WARNING
The refrigeration unit can start automatically causing drive components and fans to
operate unannounced. Unit operation must be prevented to avoid personal injury.
The MTRCS contains high voltage sources and exposed rotating parts. Make sure
that power cables are disconnected from the MTRCS and that the refrigeration unit is
shut down before performing maintenance on the unit. Failure to comply with this
warning can result in serious injury or death to personnel.
NOTE
Each evaporator has two sensors (evaporator return air sensor and chart recorder
sensor) mounted to the evaporator grill. The return air sensor is the forward most
positioned sensor when looking up at the evaporator. The chart recorder sensor is
the aft most positioned sensor. The following procedure is applicable to replacement
of either sensor on either evaporator.
Return Air Sensor
1. Disconnect battery negative (-) terminal (WP 0053, Disconnect).
2. Remove two bolts (Figure 2, Item 1) and washers (Figure 2, Item 2) securing evaporator cover (Figure 2,
Item 3) and carefully swing cover open.
3. Cut and remove tie wraps (Figure 2, Item 6) securing return air sensor (Figure 2, Item 4) and temperature chart
recorder sensor (Figure 2, Item 5) to evaporator cover (Figure 2, Item 3).
4. Carefully pull sensor through hole in cover (Figure 2, Item 3).
5. Disconnect electrical connector (Figure 2, Item 7) from return air sensor (Figure 2, Item 4).
6. Remove return air sensor (Figure 2, Item 4).
7. Install return air sensor (Figure 2, Item 4) and reconnect electrical connector (Figure 2, Item 7).
8. Carefully slide return air sensor (Figure 2, Item 4) and temperature chart recorder sensor (Figure 2, Item 5)
through hole and secure to evaporator cover (Figure 2, Item 3) using two tie wraps.
9. Close evaporator cover (Figure 2, Item 3) and secure using two bolts (Figure 2, Item 1) and washers (Figure 2,
Item 2).
10. Reconnect battery negative (-) terminal (WP 0053, Reconnect).
11. Place MTRCS back into desired mode of operation (TM 10-8415-222-10, Operating Procedures).
0049-3
