Thermo King 098916, Maintenance Manual

Page: 150 / 196

Refrigeration Maintenance
149
Figure 97: Vapor Injection Valve
Vapor Injection Valve
Replacement
NOTE: In most cases, only the coil requires
replacement. No other repair is possible on
solenoid valves.
Valve Removal
To remove the vapor injection valve, perform the
following steps:
1. Recover the refrigerant charge from the unit.
2. Turn the Unit On/Off switch Off. Disconnect
electrical connections to valve coil.
3. Unsolder liquid line connections to the valve.
4. Remove the valve from the unit.
Valve Installation
To install the vapor injection valve, perform the
following steps:
1. Clean the tubes for soldering.
2. Place the new valve in position and solder the
liquid line connections.
3. Pressurize the refrigeration system and check
for leaks (see “Refrigerant Leak Test
Procedure” in this chapter). Repair leak if
required.
4. Recover the refrigerant used for the leak test if
no leaks were found.
5. Evacuate the system (see “Evacuation and
Cleanup of the Refrigeration System” in this
chapter).
6. Recharge the unit with R-404A (see
“Charging the System with Refrigerant” in
this chapter).
7. Perform a controller pretrip test to verify
system operation.
NOTE: In most cases, only the coil requires
replacement. No other repair is possible on
solenoid valves.
AJA2032
CAUTION: Use a heat sink or wrap
switch with wet rags to prevent damage to
new switch.