Manitowoc QD0202A, Service Manual

Page: 159 / 175

Section 7 Refrigeration System
Part No. 80-1100-3
7-47
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.
CONNECTIONS
1. Suction side of the compressor through the suction
service valve.
2. Discharge side of the compressor through the
discharge service valve.
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.
Figure 7-14. 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. Refer to Charging Procedures.
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.
MANIFOLD SET
OPEN
BACKSEATED
VACUUM PUMP/
RECOVERY UNIT
CLOSED
OPEN
LOW SIDE
SERVICE
VALVE
HIGH SIDE
SERVICE
VALVE
BACKSEATED
OPEN
SV1404A