Rheem RASL-JEC - Charging Units With R-410 A Refrigerant; Charging By Liquid Pressure; Charging By Weight; Final Leak Testing

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IMPORTANT: Use industry-approved charging methods to ensure proper system
charge.
16.1 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 system.
A
ddition of R-410A will raise pressures (vapor, liquid and discharge).
If adding R-410A raises both vapor pressure and temperature, the unit is over-
charged.
IMPORTANT: Use industry-approved charging methods to ensure proper system
charge.
16.2 Charging By Liquid Pressure
Liquid pressure method is used for charging systems in the cooling and heating
mode. The service port on the liquid service valve (small valve) and suction (large
valve) is used for this purpose.
Verify that the outdoor unit is running and the indoor air mover is delivering the
maximum airflow for this system size. Read and record the outdoor ambient tem-
perature. Read and record the liquid and suction pressures at the ports on the liquid
and suction valves. If refrigerant lines are sized using the nameplate charge, the
correct liquid pressure is found at the intersection of the suction pressure and the
outdoor ambient.
1. Remove refrigerant charge if the liquid pressure is above the chart value.
2. Add refrigerant charge if the liquid pressure is below the chart value.
16.3 Charging By Weight
For a new installation, evacuation of interconnecting tubing and indoor coil is ade-
quate; otherwise, evacuate the entire system. Use the factory charge shown in
Table 1 of these instructions or unit data plate. Note that charge value includes
charge required for 15 ft. of standard size interconnecting liquid line. Calculate actu-
al charge required with installed liquid line size and length using:
1/4” O.D. = .3 oz./ft.
5/16” O.D. = .4 oz./ft.
3/8” O.D. = .6 oz./ft.
1/2” O.D. = 1.2 oz./ft.
With an accurate scale (+/– 1 oz.) or volumetric charging device, adjust charge dif-
ference between that shown on the unit data plate and that calculated for the new
system installation. If the entire system has been evacuated, add the total calculat-
ed charge.
16.4 Final Leak Testing
After the unit has been properly evacuated and charged, a halogen leak detector
should be used to detect leaks in the system. All piping within the condensing unit,
evaporator, and interconnecting tubing should be checked for leaks. If a leak is
detected, the refrigerant should be recovered before repairing the leak. The Clean
Air Act prohibits releasing refrigerant into the atmosphere.
!
CAUTION
R-410A PRESSURES ARE APPROXIMATELY 60% HIGHER THAN R-22
PRESSURES. USE APPROPRIATE CARE WHEN USING THIS REFRIGER-
ANT. FAILURE TO EXERCISE CARE MAY RESULT IN EQUIPMENT DAM-
AGE, OR PERSONAL INJURY.
!
WARNING
TURN OFF ELECTRIC POWER AT
THE FUSE BOX OR SERVICE
PANEL BEFORE MAKING ANY
ELECTRICAL CONNECTIONS.
ALSO, THE GROUND CONNEC-
TION MUST BE COMPLETED
BEFORE MAKING LINE VOLTAGE
CONNECTIONS. FAILURE TO DO
SO CAN RESULT IN ELECTRICAL
SHOCK, SEVERE PERSONAL
INJURY OR DEATH.
!
CAUTION
THE TOP OF THE SCROLL COMPRESSOR SHELL IS HOT. TOUCHING THE
COMPRESSOR TOP MAY RESULT IN SERIOUS PERSONAL INJURY.