Manitowoc IB1096YC, Installation, Operation And Maintenance Manual

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Installation Section 2
20
Part Number 000007924 5/14
Step 4 Connect the line set
• Maximum amount of time the refrigeration system
can be exposed to the atmosphere is 15 minutes.
• Purge line set with dry nitrogen while brazing.
• Line set shut off valves on the ice machine must
remain closed and be protected from heat during
brazing.
• The condensing unit ships with a 50/50 mixture of
nitrogen/helium.
Step 5 Pressure Test and Evacuate Line Set and
ICVD Condensing Unit
• Lineset shutoff valves must remain closed until
pressure testing and evacuation are complete.
• 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.
Pressure test the line sets and ICVD
®
Condensing Unit
with 150 psig of dry nitrogen. Add nitrogen at the line set
shut-off valves located at the back of the ice machine
head section or from the schrader valves located in the
ICVD
®
Condensing Unit. Complete the pressure test,
verify no leaks are present and remove the nitrogen from
the system before connecting the vacuum pump.
VALVES MUST REMAIN
CLOSED AND BE
PROTECTED FROM
HEAT WHEN BRAZING
(WRAP WITH WET RAG)
MINIMIZE THE TIME THE
REFRIGERATION SYSTEM
IS EXPOSED TO THE
ATMOSPHERE (15
MINUTES MAXIMUM)
LIQUID
LINE
SUCTION
LINE
ALTERNATE CONNECTIONS AT
CONDENSING UNIT SCHRADER VALVES