Reznor S5BP Unit Installation Manual - Manual (Page 14)

14
S5BP CHARGInG CHARtS - CoolInG onlY
Application notes on the use of Charging Charts
• this equipment’s cooling system contains refrigerant under high pressure. Always use safe and
environmentally sound methods when handling refrigerant handling or servicing the unit. Review
the factory literature and safety warnings prior to servicing.
• When repairing system leakages, always use a nitrogen (inert) gas to protect the refrigerant system and
pressure check the repair before re-charging. Always replace the filter-dryers when performing any repair
to the refrigeration system with one capable of acid removal. After completing the repairs, evacuate the
system to 350 - 500 microns and weigh in the refrigerant to the amount specified on the unit rating label.
• All S5BP-090/120 units are shipped from the factory with a 90 oz. holding charge refrigerant. Inspect the
unit rating label to determine the units information prior to working on the system. DO NOT mix different
refrigerants or charge the unit with a refrigerant not listed on the unit rating label.
• The refrigerant charging charts are valid for a variety of indoor return air conditions and are most influenced
by the outdoor ambient temperature, outdoor fan operation, and the unit operating voltage. Before using
these charts, ensure the unit is in a stable operating mode. As shown in Figures 4 or 5 (page 15), the ideal
system sub-cooling can vary over the range of operation. Reference the charts to determine the ideal amount
of sub-cooling for a given liquid pressure. Units charged to other values will not perform at the rated unit
efficiency (EER) or rated Coefficient of Performance (COP) in heating mode.
• To inspect a systems operation, using quality instruments, match the measured liquid temperature to the units
chart. The measured liquid pressure reading should be within 3% of the charts value for most installations.
• For systems that are operating with more than a 5% deviation, inspect the unit for the proper voltage and
phase balance and the refrigeration system for leaks.
• Units that are operating at less then 95% of the nominal voltage or with a 2% phase imbalance may see a
more significant deviation than the amount stated above.
• Do not use the charts in systems that have a fan cycling under low-ambient control. Refer to the low-
ambient kit instructions for more information. (If applicable)