Manitowoc RF Installation And Use Manual page 13

Installation Instructions
Step 4 Connecting the line set
To prevent oxidation of the copper, purge line set and
condensing unit with dry nitrogen while brazing.
A. Connect the Line Set to the Remote Condensing
Unit
!
The QuietQube Condensing unit contains refrigerant
charge. The two refrigeration valves must remain
closed until proper installation of the line sets is
completed.
The line set shut-off valves must remain closed and be
protected from heat during the brazing process. Wrap
the valves in a wet rag or other type of heat sink prior to
brazing. Cool braze joint with water immediately after
brazing to prevent heat migration to the valve.
MINIMIZE THE TIME THE
REFRIGERATION SYSTEM IS
EXPOSED TO THE ATMOSPHERE
(15 MINUTES MAXIMUM)
SUCTION LINE
LIQUID LINE
B. Connect the Line Set to the Ice Machine Head
Section
!
The ice machine head section ships from the factory
pressurized with R404A refrigerant. Recover the
refrigerant from both suction and liquid line access
ports prior to cutting into refrigeration lines.
• Cut the suction and liquid tubing with a tubing cutter,
leaving enough tubing to easily braze.
• Connect the line set.
• Cool braze joint with water immediately after brazing
to prevent heat migration.
13
Warning
Warning
Step 5 Pressure Test and Evacuate Line Set and
Ice Machine Head Section
• Suction and liquid line set shutoff valves must remain
closed until pressure testing and evacuation are
complete.
• Pressure testing and evacuation can be performed
from the ice machine head section or CVD
condensing unit shut-off valves.
• Schrader valve core removal tools that allow for
removal and installation of the valve cores without
removing manifold gauge set hoses are
recommended to decrease the evacuation time.
• Pressure test @ 150 psi (1000 kPa) for a minimum of
15 minutes.
• Minimum evacuation level is 500 microns.
Suction and liquid line shut-off valves
must remain closed until evacuation and
pressure testing are complete.
Section 2
Part Number 000007644 3/11