4. When the charge adders for the matched indoor
unit and for the refrigerant piping have been
weighed in, verify the system operation against the
temperatures and pressures in the charging chart
for the outdoor unit. Refer to the charging charts
on the outdoor unit or in the Service Application
Data on www.simplygettingthejobdone.com.
Follow the subcool or the superheat charging
procedure in this section according to the type of
indoor metering device in the system and allow
10 min after each charge adjustment for the
system operation to stabilize. Record the charge
adjustment made to match the charging chart.
(item 4)
5. Verify that the total system charge = (item 1) +
(item 2) + (item 3) = (item 4).
6. Permanently stamp the unit data plate with
the total system charge as defined in these
instructions.
Use this method whenever additional refrigerant is
required for the system charge.
WARNING
Do not attempt to pump the total system
charge into the outdoor unit for maintenance
or service. This may cause damage to the
compressor or other components. Recover and
weigh the system charge into an appropriate
recovery cylinder for any instances requiring
evacuation.
WARNING
Do not attempt to pump more than the factory
charge and an additional 15 ft line charge into
a tube and fin outdoor unit for maintenance
or service. This can cause damage to the
compressor or other components.
CAUTION
Refrigerant charging must only be carried out
by a qualified air conditioning contractor.
CAUTION
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.
Installation Manual: R-410A Outdoor Split-System Air Conditioner14
Johnson Controls Ducted Systems
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