Manitowoc Chiplet QC0700 Installation, Use & Care Manual page 27

Section 2
Step 5 Pressure Test and Evacuate The Line Set
and Remote Condensing Unit
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.
Leave the line set shut off valves closed (front seated).
Pressure test the line sets and remote 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.
Complete the pressure test, verify no leaks are present
and remove the nitrogen from the system before
connecting the vacuum pump. Connect a vacuum pump
to both of the line set shut off valves located at the back
of the ice machine head section. Evacuate to 250
microns (or less). To completely evacuate the Remote
condensing unit, continue the evacuation for 30 minutes
after reaching the 500 micron point.
If required, the line set and condensing unit can be
evacuated from the schrader valves located in the
remote condensing unit. Schrader valve core removal
tools (that allow for putting the cores back in without
removing vacuum pump hoses) must be used if
evacuating from the condensing unit side.
Isolate the vacuum pump from the line set shut off
valves and/or condensing unit access ports prior to
proceeding. Open refrigeration system shut off valves.
The suction line, liquid line and receiver service valves
are closed during shipment and installation.
ALTERNATE CONNECTIONS AT
CONDENSING UNIT SCHRADER VALVES
Part Number 000002688
Step 6 Open The Valves Prior To Starting The Ice
NOTE: You will not hear refrigerant flow when the valves
are opened. Refrigerant will not flow until the toggle
switch is placed in the ice position and the liquid line
solenoid valve opens.
CONNECT
VACUUM PUMP TO
LINE SET SHUT
OFF VALVES
SV1757
OPEN SUCTION AND LIQUID LINE SHUT OFF VALVES
After opening suction, discharge and receiver service
valves, refrigerant pressure will not be detected until
the toggle switch is placed in the ICE position and the
liquid line solenoid valve energizes.
Verify O-ring in schrader valve caps are intact and
reinstall on shut off valves to prevent refrigerant leakage.
Replace shut off valve access caps and torque to the
following specifications.
Torque Value's
SV2085
Installation Instructions
Machine.
A. Slowly backseat (open-turn counterclockwise)
the suction line shut off valve.
B. Slowly backseat (open-turn counterclockwise)
the liquid line shut off valve.
C. Slowly backseat (open-turn counterclockwise)
the receiver service valve.
USE ALLEN WRENCH TO OPEN
! Caution
Stem
Caps
Schrader Core
(TURN COUNTERCLOCKWISE)
LIQUID AND SUCTION LINE
SHUT-OFF VALVES
SV1784
18-20 ft. lbs.
12-15 ft. lbs.
1.5-3 in. lbs.
2-17