Manitowoc UG Series, Technician'S Handbook

Page: 85 / 128

Part Number: 040006847 12/19 85
Refrigerant Charging
Due to the small refrigerant quantities, a cap tube in the
.50 to .85 ID range with a shutoff valve at the access port
can be used to control the flow of refrigerant. The charge
accuracy must be /- 1% of the nameplate listed
charge.
14. Invert the charging bottle, and place on a scale
capable of reading grams and ounces.
15. Purge liquid refrigerant to the shutoff valve, then zero
out the scale and allow the reading to settle.
NOTE: It is important that the scales and hoses are
positioned so that they will not be disturbed when adding
refrigerant.
Important
The charge is critical on all Manitowoc ice machines.
Use a scale to ensure the proper charge is installed.
A quick disconnect is required for the high side
connection
16. Add refrigerant through the high side and close the
valve just before the nameplate refrigerant amount is
reached, then add refrigerant to reach the final charge
amount. If all of the refrigerant can not be added to
the high side, the remainder can be added as vapor to
the low side while the compressor is running.
17. Press the power button.