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G. Removal and Replacement of Water Regulating Valve -
Water-Cooled Model Only
IMPORTANT
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) Move the control switch to the "OFF" position, then turn off the power supply. Remove
the front and top panels, then move the power switch to the "OFF" position.
2) Remove the apron panel, then remove the left side panel.
3) Recover the refrigerant and store it in an approved container.
4) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip
tray, then remove the drip tray and hose.
5) Close the condenser water supply line shut-off valve, then open the condenser water
supply line drain valve.
6) Attach a compressed air or carbon dioxide supply to the condenser water supply line
drain valve.
7) 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.
8) Disconnect the capillary tube at the condenser outlet.
9) Disconnect the are-connections of the valve.
10) Remove the screws and the valve from the bracket.
11) Install the new valve.
12) Remove the drier, then place the new drier in position.
13) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.
14) 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.
15) Evacuate the system, and charge it with refrigerant. See the nameplate for the required
refrigerant charge.
16) Connect the are-connections.
17) Close the condenser water supply line drain valve, then open the condenser water
supply line shut-off valve.
18) Check for water leaks.
19) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to
the tee. Pour water into the drip tray and check for leaks.