icetro ID-0450-AN, Installation & Service Manual

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Disassembly ID-0450
Removal and Replacement of Expansion Valve
! Caution !
Sometimes moisture in the refrigeration system exceeds the drier’s capacity, causing the expansion valve to freeze.
Whenever the refrigeration system is open, replace the drier and do not open the new drier until all repairs and part
replacements are complete.
1. Turn off the power switch and the circuit breaker, unplug the power cord from the
outlet, and then remove the right-side panel.
2. Recover the refrigerant and store it in an approved container.
3. Remove the sensing bulb from the suction line.
4. Remove the expansion valve cover and braze out the expansion valve.
5. Braze in new expansion valve while flowing 3-4 PSIG nitrogen gas.
!
W
arning !
Wrap a wet cloth around the valve body to prevent it from
heating up. (The body should not exceed 249°F when
soldering.)
6. Replace with a new dryer.
7. Check that there are no leaks with nitrogen gas at 140 PSIG and soap bubbles.
8. Weigh in refrigerant charge. Refrigerant type and quantity are determined by product nameplate.
9. Replace the sensing bulb onto the suction line, tighten it with a band, and wrap it completely with insulation material
(Foam PE).
10. Wrap the expansion valve (TXV) with expansion valve cover (insulation material) to prevent any air gaps.
11. Assemble the panels, connect the power, turn on the circuit breaker, and turn on the power switch.
Expansion
Valve
Sensing
Bulb
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