CellarPro MINI-SPLIT 3000S REFRIGERATION SYSTEM, 1713 - Manual (Page 28)

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5. 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, using the steps outlined below. DO NOT
USE REFRIGERANT WITH ADDITIVES.
6. Important: The most common causes of compressor failure are
refrigerant overcharge, adding liquid refrigerant through the suction
access valve, and cold compressor starts. If your system is equipped with
a compressor heater, make sure this is wired to be energized even when the
system is idle. If starting up the system in a cold ambient, or if the system has
been sitting idle without the compressor heater energized for more than 24
hours, it is critical to warm the bottom shell of the compressor above the
ambient temperature for 30 minutes to drive excess refrigerant out of the
compressor oil.
7. Connect power to the Evaporator and Condensing unit, and activate the
system. IMPORTANT: If the system does not power up after the 3 minute
start up delay, verify field wiring according to the appropriate wiring
diagram. If correct, disconnect power from the system and contact
Cellarpro at 707.794.8000.
Measure pressures and temperatures to verify the system is within normal
operating limits as indicated on the Split System Data Sheet. A loose copy of
the Data Sheet is provided with the unit, and an additional copy is included at
the end of this manual. The condensing pressure must be above 105 PSIG
when taking these measurements. In a low ambient environment, it may be
necessary to temporarily block off the condenser air intake to force the
condensing pressure higher. Do not run the system if the suction superheat at
the condensing unit is below 20°F.
8. It may be necessary to slightly adjust the charge amount after weighing in the
recommended initial charge. 1) Not enough refrigerant: If the Evaporator is not
providing enough cooling, the system may be undercharged. If liquid
subcooling is below 10°F and the suction superheat is well above the minimum
of 20°F, slowly add vapor refrigerant though the suction service valve until the
subcooling is within specifications. 2) Too much refrigerant: If the suction
superheat is below 20°F, remove refrigerant until the superheat is above this
minimum limit.
9. (Optional) It should not be necessary to manually adjust the thermostatic
expansion valve superheat from the factory default setting. However if desired,
the superheat may be adjusted as follows: 1) Remove the cork tape insulation
from the expansion valve body to locate the cap on the superheat stem, and
unscrew the cap using a 5/32 in. Allen wrench. 2) Using a 5/32 in. Allen wrench,
locate the setting spindle inside the superheat stem and make superheat
adjustments ¼ turn at a time (¼ turn≈1°F). Turning clockwise increases
superheat. Turning counter-clockwise decreases superheat. The target
superheat at the evaporator is 10°F +/- 2°F. 3) Reinstall the cap and cork tape
insulation.