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DO NOT use these charts for two stage systems operating only under a single stage call for cooling.
DO NOT use these charts in systems that do not have all the outdoor fans energized, or have the fans cycling
under a low-ambient control. Refer to the low-ambient kit instructions for more information, if applicable.
This equipment's cooling systems contain refrigerant under
high pressure, always use safe practices when servicing
the unit. Always review the factory literature and safety
warnings prior to servicing.
All Q6SP-090/120 units are shipped from the factory with
the proper amount and type of refrigerant. Always 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 charging charts
Figure 13
are valid for a variety of indoor, return air conditions
and are most highly influenced by the outdoor ambient
temperature, outdoor fan operation and the unit operating
voltage. Before referencing the charts below, always
ensure that all compressor circuits are energized and have
stable operation. As can be seen in the charging charts,
the ideal system sub-cooling can vary over the range of
operation. Always 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.
26
Cooling Mode Charging Charts
Application Notes on the Use of Charging Charts
and
Figure 14 (page 27)
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 value shown for most installations. For two stage
systems, the charts are valid for both compressor stages.
For systems that are operating with more then 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 then the amount stated above.
Always use safe and environmentally sound methods for
refrigerant handling. When repairing system leakages,
always utilize 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 weight in the refrigerant
to the amount specified on the unit rating label.
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