Installation guide

9
Application Notes & Charging Charts
(Cooling Mode Only)
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under high pressure. Always use safe and environ-
mentally 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 Figure
5, Figure 6, & Figure 7 (page 10), 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)
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)
T4BE-036C/D Charging Chart-Cooling
Add refrigerant when below curve
Remove refrigerant when above curve
Figure 5. Charging Chart for 3 Ton Models
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