TM 10-8145-222-23
MAINTAINER MAINTENANCE
EVAPORATOR SENSORS
INSPECT, REPLACE
INITIAL SETUP:
Tools and Special Tools
References
Service Refrigeration Ordnance
TM 10-8415-222-10
Tool Kit (WP 0096, Table 2, Item 6)
Materials/Parts
TM 10-8145-222-23P
Tie Wrap (WP 0097, Item 55)
Equipment Condition
Personnel Required
Refrigeration unit shut down (TM 10-8415-222-10)
External power cables disconnected (TM 10-8415-
Utilities Equipment Repairer
222-10)
INSPECT
Evaporator Sensors
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 temperature
chart recorder sensor) mounted to the evaporator grill. The sensors are mounted in
tandem with each other to the forward blower on each evaporator. The temperature
chart recorder sensor is hard wired to the recorder. The return air sensor has an
electrical connector. The following procedure is applicable to inspection of either
sensor on either evaporator.
1. Disconnect battery negative (-) terminal (WP 0053, Disconnect).
2. Remove two bolts (Figure 1, Item 1) and washers (Figure 1, Item 2) securing evaporator cover (Figure 1,
Item 3) and carefully swing cover open.
3. Inspect return air sensor (Figure 1, Item 4) and temperature chart recorder sensor (Figure 1, Item 5) for cracks,
broken mount, or any other visible damage. Replace any damaged sensor or mount.
4. Inspect return air sensor (Figure 1, Item 4) and temperature chart recorder sensor (Figure 1, Item 5) wiring for
cut or frayed insulation, and secure connection.
a. Make any necessary repair to wiring with electrical tape and tighten loose hardware (WP 0091).
b. If sensor is damaged or wiring is damaged beyond repair, replace applicable sensor per this WP.
0049-1
