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Compressor damage will occur if system
is incorrectly charged. On new system
installations, charge the system as specified
in the Tabular Data Sheet for the matched coil
and follow guidelines in this manual.
If a calibrated charging cylinder or accurate
weighing device is available, add refrigerant
accordingly. Otherwise, model-specific charging
charts are provided on the access panel of the unit.
14
Installation Manual: R-410A Outdoor Split-System Air Conditioner
CAUTION
Johnson Controls Ducted Systems
Subcooling charging - TXV indoor
About this task:
The outdoor unit comes equipped with subcooling charts
optimized for that particular unit. Follow the instructions
on the unit. If those instructions are not readily available,
follow the instructions below.
1.
Set the system running in cooling mode by setting
the thermostat at least 6°F below the room
temperature and operate the system for at least 10
min to 15 min.
Refer to the Technical Guide for the indoor airflow
2.
and verify it is correct (it must be between 350
SCFM/ton and 400 SCFM/ton).
3.
Measure and record the indoor wet bulb (WB) and
the outdoor ambient dry bulb (DB) temperature.
4.
Using the charging chart located on the unit, find
the intersection of the indoor wet bulb and the
outdoor dry bulb. This is the recommended liquid
pressure (and subcooling value).
5.
Measure and record the pressure at the liquid valve
pressure port and compare to the value obtained in
Step 4.
6.
Add charge if the measured liquid pressure is lower
than the recommended value. Remove or recover
charge if the measured liquid pressure is above the
recommended value.
Example:
The liquid pressure listed at the intersection of
the indoor WB and the outdoor DB is 320 psig.
The pressure at the liquid valve is 305 psig. It is
necessary to add refrigerant to increase the liquid
pressure to 320 psig.
Note:
Condenser subcooling is obtained by
calculating the difference between the
saturated refrigerant temperature of the
pressure measured at the liquid base valve
and the liquid tube temperature as measured
at the liquid base valve.
Subcooling Temperature (TC) = Saturated
Temperature (TS) – Liquid Temperature (T)
It is unlawful to knowingly vent, release, or
discharge refrigerant into the open air during
repair, service, maintenance, or the final
disposal of this unit.
CAUTION
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