Rheem ARL-JEZ 16 Seer Series, Installation Instructions Manual, Page: 15 / 40

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air back to the blower. If they are too small, they also cause noise. The installers
should balance the air distribution system to ensure proper quiet airflow to all rooms
in the home. This ensures a comfortable living space.
These simple mathematical formulas can be used to determine the CFM in a resi-
dential or light commercial system. Electric resistance heaters can use:
CFM =
volts x amps x 3.413
SHC x temp rise
Gas furnaces can use:
CFM =
Output Capacity in BTUH*
SHC x temp rise
*Refer to furnace data plate for furnace output capacity. SHC = Sensible Heat
Constant (see table below), an air velocity meter or airflow hood can give a more
accurate reading of the system CFM. The measurement for temperature rise should
be performed at the indoor coil inlet and near the outlet, but out of direct line of sight
of the heater element or heat exchanger. For best results, measure air temperature
at multiple points and average the measurements to obtain coil inlet and outlet tem-
peratures.
CHECKING REFRIGERANT CHARGE
Charge for all systems should be checked against the Charging Chart inside the
access panel cover.
IMPORTANT: Use factory-approved charging method as outlined on the next 4
pages to ensure proper system charge.
CHARGING UNITS WITH R-410A REFRIGERANT
Charge for all systems should be checked against the Charging Chart inside the
access panel cover.
IMPORTANT: Do not operate the compressor without charge in the system.
Altitude
(feet)
SENSIBLE HEAT
CONSTANT
(SHC)
ALTITUDE
(FEET)
SENSIBLE HEAT
CONSTANT
(SHC)
Sea Level 1.08 6000 0.87
500 1.07 7000 0.84
1000 1.05 8000 0.81
2000 1.01 9000 0.78
3000 0.97 10000 0.75
4000 0.94 15000 0.61
5000 0.90 20000 0.50
!
WARNING
The top of the scroll compressor shell is hot. Touching the compressor
top may result in serious personal injury.
!
NOTICE
The optimum refrigerant charge for any outdoor unit matched with any
indoor coil or air handler is affected by the application. Therefore, charg-
ing data has been developed to assist the field technician in optimizing the
charge for all mounting configurations. Refer to the charging chart inside
the access panel cover on the unit and choose the appropriate column for
the specific application being installed or serviced.
!
CAUTION
R-410A pressures are approximately 60% higher (1.6 times) than R-22 pres-
sures. Use appropriate care when using this refrigerant. Failure to exercise
care may result in equipment damage or personal injury.