Wine Guardian Ducted Split Wine Cellar Cooling Systems (WGS175) - Manual - Manual (Page 38)

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Leak Checking and Evacuation Process
WARNING
ALL COMPONENTS CHARGED WITH DRY AIR MUST BE EVACUATED
BEFORE CHARGING WITH REFRIGERANT

Purge the dry air charge from the unit by opening the liquid line shut-off valve or
removing the liquid line outlet fitting or plug, whichever is applicable for your
particular unit. Connect the suction and liquid lines to the unit.

Pressurize and leak test the entire system including the condensing unit, evaporator and
all connecting tubing, fittings, and brazed joints using the intended operating
refrigerant for leak testing. A pressure equal to the low side test pressure marked on the
unit nameplate is recommended for leak testing. Repair any leaks found. Connect a
good vacuum pump to both the low and high side evacuation valves (if provided) with
copper tube or high vacuum tube (three-eighths inch inside diameter minimum) and
draw a deep vacuum of at least 15pp microns. Do not use the motor compressor to pull
a vacuum and do not operate the motor compressor in a vacuum. Break the vacuum
with nitrogen.

Evacuate the system to hold at 500 microns and break the vacuum with refrigerant.
Remove the vacuum pump. The system is now ready for charging. Charge the system
with the correct amount of refrigerant and mark the amount, with a ballpoint pen, in
the space provided on the unit nameplate.
NOTE: When charging through the suction service valve the refrigerant should
be charged in vapor form. NEVER CHARGE IN LIQUID FORM. Refrigerant
should always be charged through a dryer. Charging in liquid form may damage
the valve plate assembly as well as scrub the oil out of the compressor
bearings
.
WARNING
NON-AZEOTROPES MUST BE CHARGED IN THE LIQUID PHASE ONLY. TO AVOID
COMPRESSOR DAMAGE, LIQUID MUST ALWAYS BE CHARGED INTO THE HIGH SIDE OR
INTO AN ACCUMULATOR.
NOTE: Be sure there is not an overcharge of refrigerant. An overcharge might
permit liquid refrigerant to enter the motor compressor and damage the valves,
rods, pistons, etc.
。