Vintage Cellars Split System CellarPro - Manual (Page 20)

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4. Pressurize the system to a maximum of 150PSIG of dry nitrogen. Mark the
pressure and hold for a minimum of 1 hour. If the pressure holds, proceed to
the next step, otherwise locate and repair the leak and repeat this step.
5. Evacuate the system to a minimum of 500 microns. If the vacuum is
achieved, proceed to the next step, otherwise locate and repair the leak and
repeat from step 4.
6. Disconnect the vacuum pump, but leave the system under vacuum. Use a
charging scale to accurately weigh in the refrigerant. Charge liquid R-134a
refrigerant through the liquid service valve according to the charge pounds
indicated in the "System R-134a Charge Guidelines" chart below. Additional
refrigerant may need to be added, as detailed in the next step.
7. Warm the bottom shell of the compressor above the ambient temperature for
30 minutes to drive excess refrigerant out of the compressor oil. Connect
power to the Evaporator and Condensing unit, and activate the system.
Check that the sight glass is clear when the compressor is running. The
condensing temperature must be above 105°F (135.0 PSIG) when inspecting
for a clear sight glass. In a low ambient environment, it may be necessary to
block off the condenser air intake to force the condensing temperature higher.
If the sight glass is not clear, slowly add vapor refrigerant though the suction
service valve.
8. With a clear sight glass, adjust the superheat on the thermostatic expansion
valve to 10°F +/- 2°F, as measured at the suction access valve located in the
Evaporator.
9. Once the superheat is adjusted, ensure the condenser face airflow is
unrestricted and allow the system to balance for 30 minutes.
10. Check the suction superheat at the compressor using the access port on the
suction service valve. A minimum superheat of 20°F is required at this
location. If it is below 20°F, recheck the thermostatic expansion valve
superheat and increase as necessary to ensure a 20°F superheat at the
compressor.
11. Adjust the fan cycling control (located on the Condensing unit) so that the
condenser fan cuts-out at approximately 90°F (104.5 PSIG), and cuts-in at
120°F (171.0 PSIG).