Manitowoc STH042 4/16, Technician'S Handbook

Page: 117 / 146

Part Number STH042 4/16 117
SELF-CONTAINED RECOVERY/EVACUATION
1. Place the power button in the OFF position.
2. Install manifold gauge set, charging cylinder/scale,
and recovery unit or two-stage vacuum pump.
3. Open (backseat) the high and low side ice machine
service valves, and open high and low side on
manifold gauge set.
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 500 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 an electronic leak detector
after charging the ice machine.
Follow the Charging Procedures below.
CHARGING PROCEDURES
mportant
The charge is critical on all Manitowoc ice machines.
Use a scale or a charging cylinder to ensure the proper
charge is installed.
1. Be sure the power button is in the OFF position.
2. Close the vacuum pump valve, the low side service
valve, and the low side manifold gauge valve.
3. Open the high side manifold gauge valve, and
backseat the high side service valve.
4. Open the charging cylinder and add the proper
refrigerant charge (shown on nameplate) through
the discharge service valve.
5. Let the system “settle” for 2 to 3 minutes.
6. Press the power button to the on position.