Rheem RPVS Series Installation, Operation & Maintenance Instructions Manual page 22

R e s i d e n t i a l S p l i t
R e v. : 1 3 M a r c h , 2 0 1 5
Refrigeration Installation
Evacuation Of The Lineset And Coil
The line set and coil must be evacuated to at least 500
microns to remove any moisture and noncondensables.
Evacuate the system through both service ports in the
shipping position (full CW in - see table 6) to prevent false
readings on the gauge because of pressure drop through
service ports. A vacuum gauge or thermistor capable of
accurately meausuring the vacuum depth is crucial in
determining if the system is ready for charging. If the system
meets the requirements in Figure 10, it is ready for charging.
Figure 10: Evacuation Graph
NOTICE: Use tables 13a to 13d for superheat/
subcooling values. These tables use discharge pressure
(converted to saturation temperature) and liquid line
temperature for subcooling calculations. If using liquid
line pressure, subtract 3°F from the table values.
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NOTICE!
Charging The System
There are two methods of charging a refrigerant system. One
method is the total charge method, where the volume of the
system is determined and the refrigerant is measured and
added into the evacuated system. The other method is the
partial charge method where a small initial charge is added
to an evacuated system, and remaining refrigerant added
during operation.
Total Charge Method - See Table 5 for the compressor
section basic charge. For line sets with 3/8" liquid lines
add 0.6 ounces of refrigerant to the basic charge for every
installed foot of liquid line [0.6 grams per cm]. Add 1.2 oz.
per foot [1.1 grams per cm] if using l/2" line. Once the total
charge is determined, the factory pre-charge (Table 5) is
subtracted and the remainder is the amount needed to be
added to the system. This method should be used with the
ARI matched air handler.