Refrigerant Charging - Stoelting F231 Service Manual

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A. REFRIGERANT RECOVERY
1. Disconnect the machine from electrical supply
before removing any panels for servicing.
2. Remove all panels.
3. Connect the recovery unit to the suction and
discharge service valves of the compressor.
4. Connect power to the machine.
5. Turn the machine on by pressing the Main Power
Off/On button.
6. Press the right arrow, SET, then the SEL button
to access the technician level on the control.
7. Activate the Liquid Solenoid and the Refer
Solenoid on the left side and right side. Activating
the solenoids is done through the Left Output
Control and Right Output Control menus which are
located under Utilities in the Testing and Manual
Operation screen. Refer to Section 4 for details.
The solenoid valves must be energized to allow all
refrigerant to be recovered and to prevent injury
when brazing.
8. Operate the recovery unit per manufacturer's
instructions
9. After recovery is complete, deactivate the
solenoids by exiting the Testing and Manual
Operation screens.
B. EVACUATING THE REFRIGERATION SYSTEM
1. Close any open ports in the refrigeration system.
2. Connect a vacuum gauge to one of the Schrader
valves next to an evaporator.
3. Connect the evacuation unit to the suction and
discharge service valves of the compressor.
4. Connect power to the machine.
5. Turn the machine on by pressing the Main Power
Off/On button.
6. Press the right arrow, SET, then the SEL button
to access the technician level on the control.
7. Activate the Liquid Solenoid and the Refer
Solenoid on the left side and right side. Activating
the solenoids is done through the Left Output
Control and Right Output Control menus which are
located under Utilities in the Testing and Manual
Operation screen. Refer to Section 4 for details.
CAUTION
8. Evacuate the system until the gauge reads 300
microns of mercury (300μ Hg) for 5 continuous
minutes.
10. If the system will not maintain a standing vacuum
test with the vacuum pump off (gauge increases
towards atmosphere), fi nd the leak, fi x it, and
evacuate again.
11. After evacuating is complete, deactivate the
solenoids by exiting the Testing and Manual
Operation screens.

5.3 REFRIGERANT CHARGING

Refer to the following procedures to properly charge
the refrigeration system. Stoelting recommends liquid
refrigerant charging.
For qualifi ed service personnel only. Anybody work-
ing with refrigerants must be certifi ed as a Techni-
cian TYPE I as required by 40 CFR 82 Subpart F
and hold all State and/or local refrigerant handling
certifi cations. In addition, all handling, storage, and
disposal of refrigerants must be in accordance with
Environmental Protection Agency (EPA) guidelines
and standards and all State and local guidelines
and standards.
A. Ensure the electrical supply has been removed
before continuing.
B. If the system has been opened or if there was a
leak, refer to Section 5.2 - Refrigerant Recovery
and Evacuation to evacuate the system prior to
charging.
C. Refer to machine's information plate for total
charge requirements.
The refrigeration systems of F231 is critically
charged. Be sure to charge the system to the weight
listed on the machine's information plate.
D. For liquid refrigerant charging, connect refrigerant
cylinder to the discharge Schrader valve of the
compressor.
E. Energize all fi ve solenoid valves. There are three
liquid line solenoids and two suction line solenoids.
F. Add the proper amount of refrigerant according
to the machine's information plate.
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NOTE
NOTE