Rheem ARL-JEZ 16 Seer Series, Installation Instructions Manual, Page: 17 / 40

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necessary. CHARGING BY LIQUID SUB-COOLING MUST BE USED FOR FINAL
CHARGE ADJUSTMENT.
Turn the power on to the furnace or air handler. Start the outdoor unit and the fur -
nace or air handler with the thermostat. Verify that the outdoor unit is operating in
second stage and the indoor air mover is delivering the second-stage airflow for the
system size.
GROSS CHARGING BY PRESSURES
Step 1. Following air flow verification and charge weigh in, run the unit for a
minimum of 15 minutes prior to noting pressures and temperature.
IMPORTANT: Indoor conditions as measured at the indoor coil must be within
+/-2°F of the following during gross charge (pressure) evaluation:
Cooling Mode: 80°F Dry Bulb
Step 2. Note the Outdoor Dry Bulb Temperature, ODDB°F = _______°F. Unit
charging is recommended under the following outdoor conditions ONLY:
Cooling Mode ONLY: 55°F outdoor dry bulb and above
Step 3. Locate and note the design pressures. The correct liquid and vapor
pressures are found at the intersection of the Installed system and the
outdoor ambient temperature on the Charging Chart located on the inside
of the control box cover of the outdoor unit.
Liquid Pressure: = ______psig; Vapor Pressure = ______psig
Step 4. If the measured liquid pressure is below the listed requirement for the given
outdoor and indoor conditions, add charge. If the measured liquid pressure
is above the listed requirement for the given Outdoor and Indoor conditions
remove charge.
FINAL CHARGE BY SUB-COOLING
Step 1. After gross charging note the designed Sub-Cool value. The correct sub-
cooling value is found at the intersection of the Installed system and the
outdoor ambient temperature on the Charging Chart located on the inside
of the control box cover of the outdoor unit.
SC° from Charging Chart = _________°F.
IMPORTANT: Indoor conditions as measured at the indoor coil are required to be
80°F dry bulb for fine tune unit charge adjustment. Unit charging is recommended
under the following outdoor conditions ONLY:
Cooling Mode ONLY: 55°F outdoor dry bulb and above
!
NOTICE
If the Indoor temperature is above or below the recommended range, run
the system to bring the temperature down or run the electric heat/furnace
to bring the temperature up. System sub-cooling values provided in the
Charge Chart for outdoor dry bulbs corresponding to conditions outside
of the above range, are provided as reference only.
!
NOTICE
If the Indoor temperature is above or below the recommended range, to
bring the temperature down or run the electric heat/furnace t bring the
temperature within this range. System pressure values provided in the
Charge Chart for outdoor dry bulbs corresponding to conditions outside
of ranges listed below, are provided as reference ONLY.
!
NOTICE
The refrigerant pressures provided are for gross charge check ONLY.
These pressure values are typical, but may vary due to application.
Evaporator load will cause pressures to deviate. Notice that all systems
have unique pressure curves. The variation in the slope and value is
determined by the component selection for that indoor/outdoor matched
system. The variation from system to system seen in the table is normal.