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Refrigeration System Section 7
7-16
Part No. 80-1214-3
Connections
Manifold gauge sets must utilize low loss fittings to
comply with U.S. Government rules and regulations.
Make these connections:
• Suction side of the compressor through the suction
shut-off valve.
• Discharge side of the compressor through the liquid
line shut-off valve.
• Receiver service valve, which evacuates the area
between the check valve in the liquid line and the
liquid line solenoid valve.
Recovery/Evacuation (QF2200/QF2300)
1. Place the toggle switch in the OFF position and
disconnect all power to the ice machine and
condensing unit.
2. Install the manifold gauges, charging scale and
recovery unit or two-stage vacuum pump.
3. Open the receiver service valve halfway.
4. Open high and low side on the manifold gauge set.
5. Perform recovery or evacuation:
A. Recovery: Operate the recovery unit as directed
by the manufacturer’s instructions.
B. Evacuation prior to recharging: Evacuate to 500
microns. Then allow the pump to run for an
additional hour. Turn off the pump and perform a
standing vacuum leak check.
6. Refer to Charging Procedures.
Important
Replace the liquid line drier before evacuating and
recharging. Use only a Manitowoc (OEM) liquid line
filter drier to prevent voiding the warranty.
!
Warning
Recovery/Evacuation requires connections at three
points for complete system recovery/evacuation. A
check valve is located in the ice machine head
section between the liquid line shut-off valve and the
receiver. The check valve prevents refrigerant
migration from the receiver to the condensing unit in
the off cycle. Connections must be made at three
points (receiver service valve, suction line and liquid
line) to allow recovery and evacuation of the entire
system.
!
Warning
The receiver service valve (located in the ice
machine head section) must be accessed during
refrigerant recovery to allow complete removal of
the refrigerant charge.
CONNECTIONS MUST BE
MADE AT 3 POINTS FOR
COMPLETE REFRIGERANT
RECOVERY OR EVACUATION
SV3016
Revised 8/2003