Rheem RARL-JEC Installation Instructions - Page 35

! WARNING TURN OFF ELECTRIC POWER AT THE FUSE BOX OR SERVICE PANEL BEFORE MAKING ANY ELECTRICAL CONNECTIONS. ALSO, THE GROUND CONNECTION MUST BE COMPLETED BEFORE MAKING LINE VOLTAGE CONNECTIONS. FAILURE TO DO SO CAN RESULT IN ELECTRICAL SHOCK, SEVERE PERSONAL INJURY OR DEATH. 15.1 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. Addition of R-410A will raise pressures (vapor, liquid and discharge). If adding R-410A raises both vapor pressure and temperature, the unit is overcharged. IMPORTANT: Use industry-approved charging methods to ensure proper system charge. ! CAUTION R-410A PRESSURES ARE APPROXIMATELY 60% HIGHER THAN R-22 PRESSURES. USE APPROPRIATE CARE WHEN USING THIS REFRIGERANT. FAILURE TO EXERCISE CARE MAY RESULT IN EQUIPMENT DAMAGE, OR PERSONAL INJURY. 15.2 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 temperature. 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. 15.3 Charging By Weight For a new installation, evacuation of interconnecting tubing and indoor coil is adequate; 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 actual 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 difference 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 calculated charge. 15.4 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. 35