31
Charging
5.0 SYSTEM START-UP & REFRIGERANT CHARGING
system. Allow the system to stabilize for 5 minutes
before rechecking the pressures against the chart.
6) Repeat steps 4 and 5 as required.
7) Once the pressures are correct, allow the
system to operate for a minimum of 15 minutes
and recheck the pressures against the charging
chart, adjust charge as needed, and repeat until
the pressures are correct after 15 minutes of
operating at that charge level.
Final Charge by
Subcooling
IMPORTANT:
: Charging by weight or pressure
is not always accurate since the application can
affect the optimum refrigerant charge. Charging
by weight or pressure is considered a starting
point ONLY. Always check the charge by using
the Charging Chart and adjust as necessary.
CHARGING BY LIQUID SUBCOOLING MUST BE
USED FOR FINAL CHARGE ADJUSTMENT.
1. After gross charging, note the designed
subcooling value on the Charging Chart located
inside the access panel cover. SC° from Charging
Chart = _____°F [_____°C].
IMPORTANT:
Verify that the outdoor unit is
operating in second stage and the indoor air mover
is delivering the correct airflow for the system size.
Indoor conditions as measured at the indoor coil
are required to be between 70°F [21.1°C] and
75°F [23.9°C] dry bulb for fine-tuned unit charge
adjustment. Unit charging is recommended under
the following outdoor conditions ONLY: Cooling
Mode ONLY: 55°F [12.8°C] outdoor dry bulb and
above
NOTICE:
If the indoor temperature is above or
below the recommended range, run the system
to bring the temperature down or run the electric
heat/furnace to bring the temperature up. System
subcooling values provided in the Charging Chart
for outdoor dry bulbs corresponding to conditions
outside of the above range are provided as
reference ONLY.
2. Note the measured Liquid Pressure, Pliq =
______psig, as measured from the liquid (small)
service valve. Use the Temperature Pressure
Chart below to note the corresponding saturation
temperature for R-410A at the measured liquid
pressure. Liquid Saturation Temperature, SAT°=
_____°F [_____°C].
3. Note the liquid line temperature, Liq° = _____°F
[_____°C], as measured from a temperature
probe located within 6" [15.2 cm] outside of
the unit on the copper liquid line (small line). It
is recommended to use a calibrated clampon
temperature probe or an insulated surface
thermocouple.
4. Subtract the liquid line temperature from the
saturation temperature to calculate subcooling.
SAT°_____°F [_____°C] - Liq°_____°F [_____°C] =
SC°_____°F [_____°C]
5. Adjust charge to obtain the specified subcooling
value. If the measured subcool is below the listed
requirement for the given outdoor and indoor
conditions, add charge. If the measured subcool is
above the listed requirement for the given outdoor
and indoor conditions, remove charge.
TEMPERATURE PRESSURE CHART
SATURATION TEMP
(Deg. F) [Deg. C]
R-410A
PSIG
SATURATION TEMP
(Deg. F) [Deg. C]
R-410A
PSIG
SATURATION TEMP
(Deg. F) [Deg. C]
R-410A
PSIG
SATURATION TEMP
(Deg. F) [Deg. C]
R-410A
PSIG
-150 [-101]
-
-30 [-34]
17.9
35 [2]
107.5
100 [38]
317.4
-140 [-96]
-
-25 [-32]
22.0
40 [4]
118.5
105 [41]
340.6
-130 [-90]
-
-20 [-29]
26.4
45 [7]
130.2
110 [43]
365.1
-120 [-84]
-
-15 [-26]
31.3
50 [10]
142.7
115 [46]
390.9
-110 [-79]
-
-10 [-23]
36.5
55 [13]
156.0
120 [49]
418.0
-100 [-73]
-
-5 [-21]
42.2
60 [16]
170.1
125 [52]
446.5
-90 [-68]
-
0 [-18]
48.4
65 [18]
185.1
130 [54]
476.5
-80 [-62]
-
5 [-15]
55.1
70 [21]
201.0
135 [57]
508.0
-70 [-57]
-
10 [-12]
62.4
75 [24]
217.8
140 [60]
541.2
-60 [-51]
0.4
15 [-9]
70.2
80 [27]
235.6
145 [63]
576.0
-50 [-46]
5.1
20 [-7]
78.5
85 [29]
254.5
150 [66]
612.8
-40 [-40]
10.9
25 [-4]
87.5
90 [32]
274.3
-35 [-37]
14.2
30 [-1]
97.2
95 [35
295.3
Summary of Contents for ACL2120CAZ
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