Charging Charts & Application Notes - Nordyne S4BF-036 series Installation Instructions Manual

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 the
charging chart (Figure
can vary over the range of operation. Reference the
550
500
R-410A SATURATION
450
Remove refrigerant
if above the curve.
400
350
300
250
200
75
8
4), the ideal system sub-cooling
16 SEER AC MC Charging Chart
5 TON MODELS
2 - 4 TON MODELS
85 95
Liquid Temperature (F)
Figure 4. Charging Chart for 2-5 Ton Models
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)
Add refrigerant if
below the curve.
Do not add or remove refrigerant if
pressure reading is between unit
curves and saturation curve.
105 115 125 135