TENNEY ENVIRONMENTAL
CHARGING A
LOW
STAGE
)
1.
Do not charge liquid into the low stage.
2.
Do not charge the system when it is below room temperature.
3.
Do not use charging hoses on very high pressure refrigerants or low stage
refrigerants. Cylinder pressure exceeds
500
PSIG.
4.
Never charge the unit when it is running.
As
you will note from the above, low stage charging procedure differs from the conventional
method. Correct charging pressure will be noted on the equipment nameplate or in the
instructions. Remember, it
is
important that you charge by pressure, not by volume of
refrigerant.
Use
114
inch copper tube between refrigerant cylinder and system. Open the cylinder valve
very slowly. Charge into the suction side while closely watching the discharge gauge. When
correct pressure is reached, shut off the refrigerant cylinder valve, allowing the system to
equalize from
10
to
15
minutes. If the pressure drops, crack open the cylinder valve, and
slowly raise the pressure. Always take enough time: systems with expansion tanks connected
by a capillary tube or restrictor valve may need several minutes for gas pressure to equalize.
Keep the refrigerant cylinder upright when charging. Above all, be careful. Do not
over-pressurize. Disconnect the cylinder immediately when charging is complete.
A
leaky
cylinder valve could continue to bleed high pressure refrigerant into the system, possibly
causing it to rupture. Do not take chances. The saturation pressures of low temperature
refrigerants are extremely high.
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