Allied Air 4SCU20LX Manual de instruções de instalação - Página 8
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Start-Up Procedure
1.
Close electrical disconnects to energize system.
2.
Set room thermostat at desired temperature. Be sure
set point is below indoor ambient temperature.
3.
Set the system thermostat at least 5°F below set point
to operate the system at 100% capacity.
Adjusting Charge
Factory charge is shown on the rating label located on the
access panel.
All units are factory charged for 15 feet of connecting
line set. Charge should be adjusted for line set lengths
other than 15 feet. For line sets shorter than 15 feet in
length, remove charge. For line sets longer than 15 feet,
add charge. Oil charge is sufficient for all line lengths in
most residential applications.
Refrigeration Charge Adjustment
Liquid Line Diameter
3/8"
Before final adjustment is made to the refrigerant charge,
check for proper indoor airflow. Recommended airflow is
350-450 CFM per ton (12,000 Btuh) through a wet coil.
Refer to indoor unit instructions for methods of determining
air flow and blower performance.
Page 8 of 11
Oz. Per Linear Foot
0.6
Table 3.
Cooling Cycle Charge Adjustment Procedure
Units installed with cooling mode TXV require charging
with the subcooling method.
1. Operate unit a minimum of 10 minutes before checking
charge.
2.
Measure liquid service valve pressure by attaching an
accurate gage to service port. Determine saturation
temp. from T/P chart.
3.
Measure liquid line temperature by attaching an
accurate thermistor type or electronic thermometer to
liquid line near outdoor coil.
4.
Calculate subcooling (saturation temp. - measured
temp.) and compare to table on back of control box
cover.
5.
Add refrigerant if subcooling is lower than range shown
in table. Recover refrigerant to decrease subcooling.
6.
If ambient temp. is lower than 65° F, weigh refrigerant
according to the name plate data.
Issue 1831
507523-01