Manitowoc J-1300, Руководство по обслуживанию

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Section 7 Refrigeration System
7-46
NORMAL REMOTE 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
Important
Recovery/evacuation of a remote system requires
connections at four points for complete system
evacuation. See the drawing on the following page.
Make these connections:
•
Suction side of the compressor through the
suction service valve.
•
Discharge side of the compressor through the
discharge service valve.
•
Receiver outlet service valve, which evacuates the
area between the check valve in the liquid line
and the pump down solenoid.
•
Access (Schraeder) valve on the discharge line
quick-connect fitting, located on the outside of
the compressor/evaporator compartment. This
connection evacuates the condenser. Without it,
the magnetic check valves would close when the
pressure drops during evacuation, preventing
complete evacuation of the condenser.
NOTE: Manitowoc recommends using an access
valve core removal and installation tool on the
discharge line quick-connect fitting. This permits
access valve core removal. This allows for faster
evacuation and charging, without removing the
manifold gauge hose.
REMOTE 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.
3. Open (backseat) the high and low side ice
machine service valves.
4. Open the receiver service valve halfway.
5. Open high and low side on the manifold gauge
set.
6. 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 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.
7. Follow the Charging Procedures on page 7-48.