8
charging charts & application notes
• 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
,
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)
Figure 4. charging chart for 2 ton models
Add refrigerant when below curve
Remove refrigerant when above curve
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
500
520
540
560
580
600
75
80
85
90
95
100
105
110
115
120
125
130
135
Liquid Pressure (psig)
Liquid Temperature (F)
S4BF-024KC Charging Chart-Cooling
Summary of Contents for FS4BF
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