Hoshizaki KM-150BAF, Руководство по обслуживанию

Страница: 41 / 55

41
5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE
IMPORTANT
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) Turn off the power supply.
2) Remove the Front Panel and slide out the refrigeration base.
3) Recover the refrigerant and store it in an approved container.
4) Remove the insulation and the Expansion Valve Bulb on the suction line.
5) Remove the Expansion Valve Cover, and disconnect the Expansion Valve using
brazing equipment.
6) Braze the new Expansion Valve, with nitrogen gas flowing at the pressure of 3 - 4
PSIG.
WARNING
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 250°F.
7) Install the new Drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
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 in position. Be sure to secure it with clamps
and to insulate it.
11) Place the new set of Expansion Valve Covers in position.
12) Replace the panels in their correct position.
13) Plug in the icemaker, and turn on the power supply.