Hoshizaki fh1-ssb Manual Suplementar

34

Sometimes moisture in the refrigeration 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. Install the new drier with the arrow 
on the drier in the direction of the refrigerant flow.

1) Unplug the unit from the electrical outlet.
) 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.
7) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.

Always protect the valve body by using a damp cloth to prevent the valve from 
overheating. Do not braze with the valve body exceeding 50°F (11°C).

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 expansion valve bulb to the suction line in the same location as the previous 

bulb. The bulb should be at the 1 o'clock position on the tube. Be sure to secure the 
bulb with the clamp and holder and to insulate it.

11) Place the expansion valve cover in position.
1) Replace the panels in their correct positions.
13) Plug the unit back in.