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

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Addition of R-410A will raise high-side pressures (liquid, and discharge).
All steps listed should be performed to insure proper charge has been set. For mea-
suring pressures, the service valve port on the liquid valve (small valve) and the
service port on the suction line between the reversing valve and compressor are to
be used.
CONFIRM ID AIR FLOW & COILS ARE CLEAN
Confirm adequate Indoor supply air flow prior to starting the system. See the
Technical Specification sheet for rated air flow for each ID/OD unit match. Air
filter(s) and coils (indoor & outdoor) are to be clean and free of frost prior to starting
the system. Supply Air flow must be between 375 and 450 cfm per rated cooling ton
prior to adjusting system charge. If a humidification system is installed disengage it
from operating prior to charge adjustment. Refer to the “Checking Airflow” section of
this manual for further instruction.
MEASUREMENT DEVICE SETUP
Step 1. With an R410A gauge set, attach the high pressure hose to the access
fitting on the liquid line (small) service valve at the OD unit.
Step 2. Attach the low pressure hose to the common suction port connected to the
common suction line between the reversing valve and compressor.
Step 3. Attach a temperature probe within 6” outside of the unit on the copper
liquid line (small line). For more accurate measurements clean the copper
line prior to measurement and use a calibrated clamp on temperature
probe or an insulated surface thermocouple.
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
“Electrical and Physical Data” on page 4 of these instructions or on the unit data
plate. Note that the charge value includes charge required for 15 ft. [4.6 m] of
standard-size inter-connecting liquid line without a filter drier. Calculate actual
charge required with installed liquid line size and length using:
1/4” [6.4 mm] O.D. = .3 oz./ft. [8.5 g/.30 m]
5/16” [7.9 mm] O.D. = .4 oz./ft. [11.3 g/.30 m]
3/8” [9.5 mm] O.D. = .6 oz./ft. [17.0 g/.30 m]
1/2” [12.7 mm] O.D. = 1.2 oz./ft. [34.0 g/.30 m]
Add 6 oz. for field-installed filter drier.
With an accurate scale (+/– 1 oz. [28.3 g]) 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.
IMPORTANT: Charging by weight is not always accurate since the application can
affect the optimum refrigerant charge. Charging by weight is considered a starting
point ONLY. Always check the charge by using the charging chart and adjust as
!
NOTICE
Verify system components are matched according to the outdoor unit
Specification Sheet.
!
NOTICE
System maintenance is to be performed by a qualified and certified technician.
!
NOTICE
ADJUST THE SYSTEM CHARGE BY WEIGHT FOR THE STRAIGHT
LENGTH OF THE REFRIGERANT LINE SET.