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505128M 03/06
Refrigerant Charging
Units are factory charged with the amount of HCFC-22 re-
frigerant indicated on the unit nameplate. This charge is
based on a matching indoor coil and outdoor coil with a 15
ft. (4.6 m) line set. For varying lengths of line set, refer to
table 4 for refrigerant charge adjustment check.
Table 4
Refrigerant Charge per Line Set Lengths
Liquid Line
Set Diameter
Oz. per 5 ft. (g per 1.5 m) adjust
from 15 ft. (4.6 m) line set*
5/16 in. (8 mm)
2 ounce per 5 ft. (57 g per 1.5 m)
3/8 in. (9.5 mm)
3 ounce per 5 ft. (85 g per 1.5 m)
NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount. If
line length is less than 15 ft. (4.6 m), subtract this amount.
The outdoor unit should be charged during warm weather.
However, applications arise in which charging must occur
in the colder months.
The method of charging is deter-
mined by the unit’s
refrigerant metering device
and the
outdoor ambient temperature
.
Measure the liquid line temperature and the outdoor ambi-
ent temperature as outlined below:
1. Connect the manifold gauge set to the service valves:
low pressure gauge to
vapor
valve service port
high pressure gauge to
liquid
valve service port
2. Connect the center manifold hose to an upright cylin-
der of HCFC-22. Close manifold gauge set valves.
3. 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 ambi-
ent temperature.
5. When the heating demand has been satisfied, switch
the thermostat to cooling mode with a set point of 68
F
(20
C). When pressures have stabilized, use a digital
thermometer to record the liquid line temperature.
6. The outdoor temperature will determine which charg-
ing method to use. Proceed with the appropriate
charging procedure.
Charge Using Weigh−in Method (Fixed Orifice/
TXV Systems) − Outdoor Temp. <65°F (18°C)
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, use the weigh−in method to charge the
unit. Do this after any leaks have been repaired.
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 you are charging
the unit during warm weather, follow one of the other pro-
cedures outlined below.
Charge Using Subcooling Method (Fixed
Orifice Systems) − Outdoor Temp. >65°F (18°C)
If you charge a fixed orifice system when the outdoor ambi-
ent is 65
F (18
C) or above, use the subcooling method to
charge the unit.
1. With the manifold gauge hose still 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 a temperature/pressure chart for
R−22
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
subcooling.
Saturation Temperature
F (
C)
Liquid Line Temperature
F (
C)
=
Subcooling Value
F (
C)
5. Compare the subcooling value with those in table 5. If
subcooling is greater than shown, recover some
refrigerant. If subcooling is less than shown, add some
refrigerant.
Table 5
Subcooling Values for Fixed Orifice Systems
Outdoor
Temp
Liquid Subcooling [+ 1
_
F (.6
_
C)]
Temp.
F (
C)
10ACE−24
10ACE−36
10ACE−48
10ACE−60
65 (18)
10 (5.6)
17 (9.5)
15 (8.3)
14 (8)
70 (21)
9 (5)
17 (9.5)
14 (8)
15 (8.3)
75 (24)
8 (4.5)
16 (9)
13 (7)
15 (8.3)
80 (27)
7 (3.9)
15 (8.3)
13 (7)
14 (8)
85 (29)
6 (3.3)
14 (8)
12 (6.7)
14 (8)
90 (32)
5 (2.8)
14 (8)
12 (6.7)
13 (7)
95 (35)
4 (2.2)
12 (6.7)
12 (6.7)
13 (7)
100 (38)
4 (2.2)
11 (6)
11 (6)
12 (6.7)
105 (41)
3 (1.7)
10 (5.6)
10 (5.6)
12 (6.7)
110 (43)
3 (1.7)
9 (5)
9 (5)
11 (6)
115 (45)
2 (1.1)
8 (4.5)
8 (4.5)
10 (5.6)
Summary of Contents for 10ACE Series
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