Hoshizaki KM-1301SAH/3 User Manual download pdf (Page 72)

7

G. Removal and Replacement of Water-Cooled Condenser

CAUTION

1. 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 ow.

3. When brazing, protect the drier by using a wet cloth to prevent the drier from

overheating. Do not allow the drier to exceed 50°F (11°C).

1) Turn off the power supply.

) Remove the panels.

3) Close the condenser water supply line shut-off valve. If connected to a closed loop

water supply, also close the condenser return outlet shut-off valve.

4) Open the condenser water supply line drain valve. If connected to a closed loop water

supply, also open the condenser return outlet drain valve.

5) Attach a compressed air or carbon dioxide supply to the condenser water supply line

drain valve.

6) Open the water regulating valve by using a screwdriver to pry up on the spring retainer

underneath the spring. While holding the valve open, blow out the condenser using the

compressed air or carbon dioxide supply until water stops coming out.

7) Recover the refrigerant and store it in an approved container.

8) Disconnect the condenser water inlet and outlet piping and the refrigeration inlet and

outlet piping at the condenser.

9) Remove the old condenser and install the new condenser.

10) Remove the drier, then place the new drier in position.

11) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

1) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of

refrigerant to the system (if using an electronic leak detector), and then raise the

pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with

pressurized air for leak testing.

13) Evacuate the system, and charge it with refrigerant. See the nameplate for the required

refrigerant charge.

14) Close the drain valve(s). Open the condenser water supply line shut-off valve. If

connected to a closed loop water supply, also open the condenser return outlet shut-off

valve.

15) Check for water leaks.

16) Replace the panels in their correct positions.

17) Turn on the power supply.

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Hoshizaki KM-1301SAH/3 User Manual Page 72