Liquid Charging - Scotsman SCE170 User Manual

SCE170

Liquid Charging

Instructions for R-404A
In preparation for charging, the low side hose should have a sight glass, and/or a restrictor device (such as
a "Charge Faster") installed in it for metering liquid into the low side of the system.
1. After a thorough evacuation to at least 200 microns, shut off the manifold valves and switch off 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.
Note: If all of the charge will not "go in" the
discharge side:
A. Shut the discharge access valve at the ice
machine.
B. Switch the machine on.
C. Open the low side access valve at the ice
machine.
D. Open the low side manifold valve and observe
the sight glass to be certain that only gas is
flowing into the system.
E. When the proper charge is indicated on the
scale, shut off the manifold valve(s).
9. Shut off the valve on the refrigerant drum.
10. Re-open the manifold valves until all liquid has flowed out of the hoses.
11. Shut the low side access valve on the ice machine.
12. Remove hoses from ice machine and replace all caps.
Hose Connection Schematic for Liquid Charging
October 1998
Page 30