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7. TXV Replacement Information
Please follow the steps below when replacing TXV:
(1) Disassemble the front panel.
(2) Remove the thermal bulb down by undoing the copper strips around it.
(3) Seal the pressure pipe from the gas pipe with a welding gun. Be careful not to burn the gas pipe.
(4) Remove the TXV off from the liquid pipe with a welding gun. Be careful not to burn the liquid pipe.
(5) Wrap the new TXV with a piece of wet cloth to prevent damage caused by heat from being too hot
and connect the nitrogen flow to the liquid pipe to prevent it from being oxidized. Weld the TXV to the
liquid pipe, and pay attention to the direction of the TXV, then weld the pressure pipe to the gas pipe.
(6) When the pipe cools down, connect it with 150PSI nitrogen equipment and examine the work for
any leaks.
(7) Secure the thermal bulb to the gas pipe with copper strips and perform insulation works.
(8) Vacuum the unit, start up the system and the unit will start cooling operation.
(9) Allow the unit to operate for 20 minutes, then adjust the TXV superheat to 6.
(10) After the unit has operated for another 20 minutes, examine whether the superheat is appropriate
and record the reading.
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