icetro ISI-271SHSN, User Manual

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Removal and Replacement of Hot Gas Valve or Liquid Line Valve.
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve.
1. Always use a copper tube of the same diameter and length when repalcing
the valve lines; otherwise, performance may be affected
2. Always replace the strainer when replacing the hot gas valve
1. Always install a new drier every time the sealed refrigeration system is opened.
2. Do not replace the dried until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant flow
3. When brazing, protect the drier and 4-way valve by using a wet cloth to provent the
and drier 4-way valve from overheating, Do not allow the drier to exceed 250
℉
(121
℃
)
1) Turn off the power of ELCB.
2) Open the side door.
3) Recover the refrigerant using an adequate vessel.
4) Remove the bolts and the solenoid valves.
5) Disassemble the valve. When replacing the hot gas valve, replace the strainer as well.
6) Install the new valve and strainer.
7) Replace the drier with a new one.
8) While purging with nitrogen gas at pressure of 3~4 psig, braze the copper connections.
9) Inject nitrogen at pressure of 140 psig and check for leaks with electric leak detector or
soap water.
10) Vacuum the system and inject the refrigerant.
11) Connect a new solenoid valve.
12) Install the solenoid on the valve body and tighten the bolts.
13) Close the side door.
14) Turn on the power of ELCB.
IMPORTANT
WARING