Comfort-Aire HTS Series Split System,Two Stage, 2-5 Tons - Manual (Page 18)

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Installation, Operation & Maintenance HTS SERIES SPLIT SYSTEM Heat Controller, LLC
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 5) 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 14, it is ready for charging.
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 AHRI matched air handler or coil.
Figure 14: Evacuation Graph
Table 6: R-410A Charging Values
NOTICE! Use tables 14a to 14d 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 3ºF from the table values.
NOTICE!