18-BC105D1-1D-EN
25
Charging the Unit
Important:
ENSURE INDOOR BLOWER IS CONFIGURED FOR 400 CFM/TON IN clii MODE.
Table 31.
Proper Gage Pressure
Using the Standard R-410A Subcool Charging Chart, adjust refrigerant
level to attain proper gage pressure.
Add refrigerant if the Liquid Gage Pressure is lower than the chart value.
1.
Connect gauges to refrigerant bottle and unit as illustrated.
2.
Purge all hoses.
3.
Open bottle.
4.
Stop adding refrigerant when liquid line temperature and Liquid
Gage Pressure match the charging chart.
Note:
Recover refrigerant if the Liquid Gage Pressure is higher than the
chart value.
Table 32.
Stabilize the system
5.
Wait 20 minutes for the system condition to stabilize between
adjustments.
Note:
When the Liquid Line Temperature and Gage Pressure
approximately match the chart, the system is properly
charged.
6.
Remove gauges.
7.
Replace service port caps to prevent leaks. Tighten finger tight
plus an additional 1/6 turn.
20 MIN.
Table 33.
Verify Performance
8.
Refer to System Pressure Curves in the Service Facts document to
verify typical performance.
PRESSURE CURVE SAMPLE
Cooling @ 1450 SCFM
Heating @ 1350 SCFM
D
IS
C
H
A
R
G
E
P
R
E
S
S
U
R
E
(
P
S
IG
)
OUTDOOR TEMPERATURE (Degree F)
S
U
C
T
IO
N
P
R
E
S
S
U
R
E
(
P
S
IG
)
110
115
120
125
130
135
140
145
150
155
160
165
170
40
60
80
100
120
200
250
300
350
400
450
500
550
40
60
80
100
120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30
40
50
60
70
80
90
100
110
120
130
140
-5
5
15
25
35
45
55
65
200
250
300
350
400
450
500
-5
5
15
25
35
45
55
65
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
Table 34.
System Information
9.
Record system pressures and temperatures after charging is
complete.
Outdoor model number =
________________________
Measured Outdoor Ambient =
________________________°F
Measured Indoor Ambient =
________________________°F
Measured Liquid Line Temp =
________________________°F
Measured Suction Line Temp = ________________________°F
Indoor Wet Bulb =
________________________°F
Liquid Gage Pressure =
________________________ PSIG
Suction Gage Pressure = ________________________ PSIG
