Removal And Replacement Of Expansion Valve - Hoshizaki KMS-1230MLH Service Manual

4) Remove the spray tubes and the insulation at the "U" shaped notch where the
refrigeration tubing passes through the molded chassis.
5) Disconnect the evaporator tubing.
6) Remove the pop rivets securing the evaporator, then lift out the evaporator.
7) Install the new evaporator.
8) Remove the drier, then place the new drier in position. Install the new drier with the
arrow on the drier in the direction of the refrigerant flow.
9) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
10) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
11) Evacuate the system, and charge it with refrigerant. See the nameplate on the
condensing unit for the required refrigerant charge.
1) Replace the removed parts in the reverse order of which they were removed.
13) Replace the insulation pieces and the panels in their correct positions.
14) Turn on the power supply.

2. Removal and Replacement of Expansion Valve

1. 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. Install the new drier with the arrow on
the drier in the direction of the refrigerant flow.
. It is advisable to change out both expansion valves when replacing an
expansion valve.
3. Connect the expansion valve bulb to the corresponding refrigeration circuit
suction line.
1) Turn off the power supply.
) Remove the panels.
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. Place the new
expansion valve in position.
6) Remove the drier, then place the new drier in position. Install the new drier with the
arrow on the drier in the direction of the refrigerant flow.
IMPORTANT
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