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S4Bf refrigerant charging chartS - cooling only
• 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 leaks, 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.
• 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, make sure
the unit is in a stable operating mode. As shown in the charging charts (Figures 5 - 8), 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)
600
575
Remove refrigerant when above curve
550
525
500
475
450
425
400
375
350
325
300
275
250
225
200
70
75
application notes on the use of charging charts
*4BF-024KA Charging Chart
80
85
90
95
Liquid Temperature (F)
figure 5. charging chart for 2 ton units
Add refrigerant when below curve
100
105
110
115
120
125
130
135
9
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