Thermo King 914970, Manual

Page: 128 / 186

Refrigeration Service Operations
126
2. Remove the feeler bulb from the suction line
clamp. Note the position of the feeler bulb on
the suction line.
3. Unsolder the equalizer line from the
expansion valve.
4. Unsolder the inlet liquid line and the
distributor from the expansion valve.
5. Remove the expansion valve mounting bolt
and remove the expansion valve from the unit.
Installation
1. Install and bolt the expansion valve assembly
in the unit.
2. Solder (95-5 Solder) the inlet liquid line and
the distributor to the expansion valve.
3. Solder (95-5 Solder) the equalizer line to the
expansion valve.
4. Clean the suction line to a bright polished
condition. Install the feeler bulb clamps and
the feeler bulb on the side of the suction line
in its former position. The feeler bulb must
make good contact with the suction line or the
operation will be faulty. Wrap with insulating
tape.
5. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
6. Open the refrigeration valves and place the
unit in operation.
7. Test the unit to see that the expansion valve is
properly installed.
Cleaning In-line Screen
1. Perform a low side pump down; bleed
pressure back to 1 psig (7 kPa).
2. Remove the liquid line fitting.
3. A small tool with a slight hook may be needed
to pull screen from the expansion valve.
4. Clean the screen and reinstall.
NOTE: Outlet screen points toward the
distributor.
1. Suction Line
2. Capillary Bulb
3. End View
Figure 50: Location of Expansion Valve Bulb
1. Top View
Figure 51: Completely Wrap Bulb with Tape
1. Solder-in Expansion Valve Screen
2. Solder-in Type
Figure 52: Expansion Valve