Service manual

Refrigeration System Section 7
7-36
Part No. 80-1206-3
Refrigerant Recovery/Evacuation and Recharging
Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer’s recommendations.
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
shut-off valve.
• Receiver service valve, which evacuates the area
between the check valve in the liquid line and the
liquid line solenoid valve.
REFRIGERANT RECOVERY CONNECTIONS
Recovery/Evacuation
1. Place the toggle switch in the OFF position and
disconnect all power to the ice machine and
condensing unit.
2. Install manifold gauges, charging scale, and
recovery unit or two-stage vacuum pump.
3. Open 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 250
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
.
Refrigerant Recovery Connections
(Q1400C Shown)
Important
Manitowoc Ice, Inc. assumes no responsibility for
the use of contaminated refrigerant. Damage
resulting from the use of contaminated refrigerant is
the sole responsibility of the servicing company.
Important
Replace the liquid line drier before evacuating and
recharging. Use only a Manitowoc (O.E.M.) liquid
line filter drier to prevent voiding the warranty.
! Warning
Recovery/evacuation of a QuietQube® remote
system 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 THREE
POINTS FOR COMPLETE
REFRIGERANT
RECOVERY ON ALL
QuietQube® MODELS
SV1770