Removal And Replacement Of Expansion Valve - Hoshizaki DCM-230FE Service Manual

5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE

Sometimes moisture in the refrigerant circuit exceeds the Drier capacity and
freezes up at the Expansion Valve. Always install a new Drier every time the
sealed refrigeration system is opened. Do not replace the Drier until after all
other repair or replacement has been made.
1) Unplug the ice dispenser.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the Expansion Valve Bulb at the Evaporator outlet.
5) Remove the Expansion Valve Cover, and remove the Expansion Valve using
brazing equipment.
6) Braze the new Expansion Valve, with nitrogen gas flowing at the pressure of
0.02 - 0.03 MPa (0.2 - 0.3 kgf/cm
1. Do not heat the wall. Place a steel barrier for protection.
2. Always protect the valve body by using a damp cloth to prevent the valve
from overheating. Do not braze with the valve body exceeding 120°C.
7) Install the new Drier.
8) Check for leaks using nitrogen gas, 0.98 MPa (10 kgf/cm
9) Evacuate the system, and charge it with refrigerant. See the Nameplate for the
required refrigerant charge.
10) Attach the Bulb to the suction line. Be sure to secure the Bulb using a band and to
insulate it.
11) Place the Expansion Valve Cover in position.
12) Replace the panels in their correct position, and plug in the dispenser.
IMPORTANT
2 G).
WARNING
44
2
G) and soap bubbles.