TM 10-8145-222-23
MAINTAINER MAINTENANCE
EVAPORATOR THERMOSTATIC EXPANSION VALVE
INSPECT
INITIAL SETUP:
Tools and Special Tools
References
Service Refrigeration Ordnance
TM 10-8415-222-10
Tool Kit (WP 0096, Table 2, Item 6)
Personnel Required
Utilities Equipment Repairer
Equipment Condition
Refrigeration unit shut down (TM 10-8415-222-10)
External power cables disconnected (TM 10-8415-
222-10)
INSPECT
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
The Thermostatic Expansion Valve (TXV) automatically regulates the flow of
refrigerant into the evaporator coil to adjust for changes in cooling load requirements.
The expansion valve is located inside the evaporator housing on the refrigerant pipe
leading into the evaporator coil.
An expansion valve is used with each evaporator and the following procedures apply
to both expansion valves.
1. Open MTRCS control panel assembly door (Figure 1, Item 1).
2. On control box, place COMPARTMENT 1 ON/OFF rocker switch (Figure 1, Item 2) to OFF position.
3. Place COMPARTMENT 2 ON/OFF rocker switch (Figure 1, Item 3) to OFF position.
4. Place POWER ON/DOWN switch (Figure 1, Item 4) on control panel to DOWN position.
5. Close MTRCS control panel assembly door (Figure 1, Item 1) and latch (Figure 1, Item 5).
6. Disconnect battery negative (-) terminal (WP 0053, Disconnect).
0045-1
