Thermo King 098916, Руководство по обслуживанию

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Refrigeration Maintenance
145
Evaporator Expansion Valve
(TXV) Replacement
NOTE: TXV can be accessed through the
evaporator access door.
1. Perform a low side pump down or reclaim
charge depending on the unit. Release the 2-3
lbs pressure from the low side.
2. Open the evaporator access panel.
3. Install plywood or heavy cardboard on top of
coil on the left and right side. This will protect
the coil from damage.
4. Remove the left side motor and fan and
position in right side opening. Do not unwire
the motor the harness is long enough.
5. Remove TXV standoff mount.
6. Remove the panel to gain access to the TXV
element.
7. Cut the one ty band off the insulation around
the element. Peel back the insulation to expose
the clamp holding the element. Loosen the
clamp and remove the element from the tube.
8. Unsolder the three tubes to the TXV and
remove the valve from the unit.
9. Prepare the tubes in the unit and on the new
TXV for installation.
10. Solder in the new TXV. Use 15% silver solder
203-364.
11. Pressurize the refrigeration system and check
for leaks (see “Refrigeration Leak Test
Procedure” in this chapter). Repair leak if
required.
12. Evacuate the system (see “Evacuation and
Cleanup of the Refrigeration System” in this
chapter).
13. Install element in tube on suction line. Tighten
clamp. Reapply insulation around bulb and
secure with a ty band.
14. Install the element access panel and install
grommets. Install TXV mount.
15. Install left side motor and fan.
16. Open service valves or recharge unit with
R404A (see “Charging the System with
Refrigerant” in this chapter).
17. Perform a controller pretrip test to verify
system operation.
1. TXV Mount
2. Access Panel
3. Element
4. Tube on Suction Line
Figure 92: TXV Valve and Element Location