5121495-UIM-E-0716
Johnson Controls Unitary Products
7
CHARGING THE UNIT
The factory charge in the outdoor unit includes enough charge for the
unit, 15 ft. (4.6 m) of refrigerant piping, and the smallest indoor coil/air
handler match-up. Some indoor coil/air handler matches may require
additional charge.
See Tabular Data Sheet provided in unit Customer Booklet for charge
requirements. The “TOTAL SYSTEM CHARGE” must be permanently
marked on the unit data plate.
TOTAL SYSTEM CHARGE DETERMINED
1. Determine outdoor unit factory charge from Tabular Data Sheet.
2. Determine indoor coil adjustment (if any) from Tabular Data Sheet.
3. Calculate the additional charge for refrigerant piping using the Tabu-
lar Data Sheet if line length is greater than 15 feet (4.6 m).
4. Total system charge = item 1 + item 2 + item 3.
5. Check the unit against the pressure value listed on the cooling chart
on the unit or the appropriate heat charging chart on the following
pages of this Installation Manual. Make any adjustment necessary.
6. Add or subtract refrigerant to obtain the pressure listed on charging
chart. Make sure to adjust the total system charge by the amount
added or removed to obtain charging chart pressures. Permanently
mark the unit data plate with the total amount of refrigerant in the
system.
CHARGING WITH GAUGES
All units include a cooling charging chart for cooling. The heating
charging charts in Table 3 through Table 10 in this document use the
chart corresponding to the installed indoor coil. It can also be obtained
at
www.upgnet.com
under the Service Application Data section.
Before using gauges, confirm that your gauges are accurate by
comparing the gauges against a calibrated pressure gauge that
has been calibrated against a national standard. If a calibrated
pressure gauge is not available, place a R-410A virgin refrigerant
container in a conditioned space long enough to come to tempera-
ture equilibrium with the surroundings. Then measure the tem-
perature of the air and the pressure of the refrigerant and compare
it to the following table:
:
Before measuring the pressures, use the method above to check the air
flow and then consult the table and match the liquid pressure to that air
flow.
Reference the heat charging charts in Table 3 through Table 10
CAUTION
Always charge in liquid form. Take care not to slug the compressor.
CAUTION
Compressor damage will occur if system is improperly charged. On
new system installations, charge system per tabular data sheet for
the matched coil and follow guidelines in this instruction.
CAUTION
Do not leave the system open to the atmosphere. Unit damage could
occur due to moisture being absorbed by the POE oil in the system.
This type of oil is highly susceptible to moisture absorption.
WARNING
DO NOT attempt to pump “Total System Charge” into outdoor unit for
maintenance, service, etc. This may cause damage to the compres-
sor and/or other components. Recover and weigh “System Charge”
into an appropriate recovery cylinder for any instances requiring
evacuation.
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CAUTION
IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-
CHARGE REFRIGERANT INTO THE OPEN AIR DURING REPAIR,
SERVICE, MAINTENANCE OR THE FINAL DISPOSAL OF THIS
UNIT.
CAUTION
Refrigerant charging should only be carried out by a qualified air con-
ditioning contractor.
CAUTION
Compressor damage will occur if system is improperly charged. On
new system installations, charge system per tabular data sheet for
the matched coil and follow guidelines in this instruction.
TABLE 2:
R-410A Saturation Properties
Temp
(°F)
Pressure
(Psig)
Temp
(°F)
Pressure
(Psig)
Temp
(°F)
Pressure
(Psig)
40
119
75
218
110
365
45
130
80
236
115
391
50
143
85
255
120
418
55
156
90
274
125
447
60
170
95
295
130
477
65
185
100
317
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–
70
201
105
341
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–
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