Refrigerant Recovery/Evacuating And Recharging - Manitowoc J250 Service Manual

Refrigeration System
Refrigerant Recovery/Evacuation and Recharging
NORMAL SELF-CONTAINED MODEL
PROCEDURES
Refrigerant Recovery/Evacuation
Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer's recommendations.
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.
CONNECTIONS
1. Suction side of the compressor through the
suction service valve.
2. Discharge side of the compressor through the
discharge service valve.
7-44
SELF-CONTAINED RECOVERY/EVACUATION
1. Place the toggle switch in the OFF position.
2. Install manifold gauges, charging cylinder/scale,
and recovery unit or two-stage vacuum pump.
MANIFOLD SET
OPEN
BACKSEATED
LOW SIDE
SERVICE
VALVE
CHARGING
CYLINDER
CLOSED
Recovery/Evacuation Connections
3. Open (backseat) the high and low side ice
machine service valves, and open high and low
side on manifold gauges.
4. Perform recovery or evacuation:
A. Recovery: Operate the recovery unit as
directed by the manufacturer's instructions.
B. Evacuation prior to recharging: Pull the
system down to 250 microns. Then, allow the
pump to run for an additional half hour. Turn
off the pump and perform a standing vacuum
leak check.
NOTE: Check for leaks using a halide or electronic
leak detector after charging the ice machine.
5. Follow the Charging Procedures on the next page.
Section 7
OPEN
BACKSEATED
HIGH SIDE
SERVICE
VALVE
VACUUM PUMP/
RECOVERY UNIT
OPEN
SV1404A