Scotsman Ice MDT5N25, MDT5N40 Circuit Board Service, Liquid Charging, Instructions for R-404A

Printed Circuit Board Handling Precautions

Follow these simple precautions when replacing a

Printed Circuit Board

1.

Keep the replacement PC Board in the

anit-static packaging until it is ready to be installed.

2.

Be sure that your hands are clean.

3.

Just before touching the board, touch the

cabinet of the machine to discharge any possible

build up of static electricity.

4.

Handle the original and replacement boards only

by their outer edges.

5.

Place the original board in the anti-static

package for return (if in warranty).

LIQUID CHARGING

Instructions for R-404A

9. Shut off the valve on the refrigerant drum.

In preparation for charging, the low side hose

10. Re-open the manifold valves until all liquid has

should have a sight glass, and/or a restrictor

flowed out of the hoses.

device (such as a “Charge Faster”) installed in it for

11. Shut the low side access valve on the ice

metering liquid into the low side of the system.

machine.

1.

After a thorough evacuation to at least 300

12. Remove hoses from ice machine and replace

microns, shut off the manifold valves and switch off

all caps.

the vacuum pump.

2.

Place a drum of R-404A onto an electronic

scale.

3.

Attach the charging hose to the drum.

4.

Open the valve on the drum and purge the

charging hose.

5.

Zero out the scale.

6.

Shut the low side access valve at the ice

machine.

7.

Open the discharge manifold valve full open.

8.

Watch the scale, when the correct charge is

shown, shut the manifold valve.