Cooling Charging Charts - Nordyne NS6QD SERIES User's Manual & Installation Instructions

• 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 fi lter-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 specifi ed on the unit rating label.
• Charging charts are valid for a variety of indoor, return air conditions and are most infl uenced 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 the charging charts (Figures 8 - 13, page 16 - 18), 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 effi ciency
(EER) or rated Coeffi cient 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
signifi cant 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)
NS6QD CHARGING CHARTS - COOLING ONLY
Application Notes on the Use of Charging Charts
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