Allied Air 4SCU14LE SERIES Panduan Petunjuk Pemasangan dan Pemeliharaan - Halaman 13

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High pressure gauge to liquid line service valve
2. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of R410A.
3. If room temperature is below 70°F, set the room thermostat
to call for heat. This will create the necessary load for
properly charging the system in the cooling cycle.
4. Use a digital thermometer to record the outdoor ambient
temperature.
5. When the heating demand has been satisfied, switch
the thermostat to cooling mode with a set point of 68°F.
When pressures have stabilized, use a digital
thermometer to record the liquid and suction line
temperatures.
6. The outdoor temperature will determine which charging
method to use. Proceed with the appropriate charging
method.
Charge Using Weigh-In Method
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, first locate and repair any leaks then
use the weigh-in method to charge the unit.
1. Recover the refrigerant from the unit.
2. Conduct a leak check, then evacuate as previously
outlined.
3. Weigh in the charge according to the total amount shown
on the unit nameplate.
If weighing facilities are not available or if unit is being
charged during warm weather, follow one of the other
procedures outlined below.
Charge Using Subcooling Method –
Outdoor Temperatures 65°F or Above
When the outdoor ambient temperature is 65°F or above,
the subcooling method can be used to charge the unit.
1. With the manifold gauge hose on the liquid service port
and the unit operating stably, use a digital thermometer
to record the liquid line temperature.
2. At the same time, record the liquid line pressure reading.
3. Use the temperature/pressure chart (Table 5) to
determine the saturation temperature for the liquid line
pressure reading.
4. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine
506251-01
R410A Temperature/Pressure Chart
T
e
m
. p
P
e r
s
s
u
F °
P
s
g i
3
2
1
0
0
8 .
3
3
1
0
2
9 .
3
4
1
0
5
0 .
3
5
1
0
7
1 .
3
6
1
0
9
2 .
3
7
1
1
1
4 .
3
8
1
1
3
6 .
3
9
1
1
5
8 .
4
0
1
1
8
0 .
4
1
1
2
0
3 .
4
2
1
2
2
6 .
4
3
1
2
5
0 .
4
4
1
2
7
3 .
4
5
1
2
9
7 .
4
6
1
3
2
2 .
4
7
1
3
4
6 .
4
8
1
3
7
1 .
4
9
1
3
9
6 .
5
0
1
4
2
2 .
5
1
1
4
4
8 .
5
2
1
4
7
4 .
5
3
1
5
0
1 .
5
4
1
5
2
8 .
5
5
1
5
5
5 .
5
6
1
5
8
2 .
5
7
1
6
1
0 .
5
8
1
6
3
9 .
5
9
1
6
6
7 .
6
0
1
6
9
6 .
6
1
1
7
2
6 .
6
2
1
7
5
5 .
6
3
1
7
8
5 .
6
4
1
8
1
6 .
6
5
1
8
4
3 .
6
6
1
8
7
7 .
6
7
1
9
0
9 .
6
8
1
9
4
1 .
6
9
1
9
7
3 .
7
0
2
0
0
6 .
7
1
2
0
3
9 .
7
2
2
0
7
2 .
7
3
2
1
0
6 .
Issue 1015
e r
T
e
m
. p
P
e r
s
s
u
e r
T
e
F °
P
s
g i
7
4
2
1
4
0 .
1
7
5
2
1
7
4 .
1
7
6
2
2
0
9 .
1
7
7
2
2
4
4 .
1
7
8
2
2
8
0 .
1
7
9
2
3
1
6 .
1
8
0
2
3
5
3 .
1
8
1
2
3
9
0 .
1
8
2
2
4
2
7 .
1
8
3
2
4
6
5 .
1
8
4
2
5
0
3 .
1
8
5
2
5
4
1 .
1
8
6
2
5
8
0 .
1
8
7
2
6
2
0 .
1
8
8
2
6
6
0 .
1
8
9
2
7
0
0 .
1
9
0
2
7
4
1 .
1
9
1
2
7
8
2 .
1
9
2
2
8
2
3 .
1
9
3
2
8
6
5 .
1
9
4
2
9
0
8 .
1
9
5
2
9
5
1 .
1
9
6
2
9
9
4 .
1
9
7
3
0
3
8 .
1
9
8
3
0
8
2 .
1
9
9
3
1
2
7 .
1
1
0
0
3
1
7
2 .
1
1
0
1
3
2
1
8 .
1
1
0
2
3
2
6
4 .
1
1
0
3
3
3
1
0 .
1
1
0
4
3
3
5
7 .
1
1
0
5
3
4
0
5 .
1
1
0
6
3
4
5
3 .
1
1
0
7
3
5
0
1 .
1
1
0
8
3
5
5
0 .
1
1
0
9
3
6
0
0 .
1
1
1
0
3
6
5
0 .
1
1
1
1
3
7
0
0 .
1
1
1
2
3
7
5
1 .
1
1
1
3
3
8
0
2 .
1
1
1
4
3
8
5
4 .
1
1
5
3
9
0
7 .
Table 5
m
. p
P
e r
s
s
u
e r
F °
P
s
g i
1
6
3
9
6
0 .
1
7
4
0
1
3 .
1
8
4
0
6
7 .
1
9
4
1
2
2 .
2
0
4
1
7
7 .
2
1
4
2
3
2 .
2
2
4
2
8
8 .
2
3
4
3
4
5 .
2
4
4
4
0
2 .
2
5
4
4
5
9 .
2
6
4
5
1
8 .
2
7
4
5
7
6 .
2
8
4
6
3
5 .
2
9
4
6
9
5 .
3
0
4
7
5
6 .
3
1
4
8
1
6 .
3
2
4
8
7
8 .
3
3
4
9
4
0 .
3
4
5
0
0
2 .
3
5
5
0
6
5 .
3
6
5
1
2
9 .
3
7
5
1
9
3 .
3
8
5
2
5
8 .
3
9
5
3
2
4 .
4
0
5
3
9
0 .
4
1
5
4
5
6 .
4
2
5
5
2
3 .
4
3
5
5
9
1 .
4
4
5
6
5
9 .
4
5
5
7
2
8 .
4
6
5
7
9
8 .
4
7
5
8
6
8 .
4
8
5
9
3
8 .
4
9
6
0
1
0 .
5
0
6
0
8
1 .
5
1
6
1
5
4 .
5
2
6
2
2
7 .
5
3
6
3
0
1 .
5
4
6
3
7
5 .
5
5
6
4
5
0 .
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