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STEP 6 - Adjust refrigerant level to attain
proper gage pressure.
Add refrigerant if the Liquid Gage Pressure
is lower than the chart value.
1. Connect gages 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 matches the charging chart
Final Subcooling value.
Recover refrigerant if the Liquid Gage Pres-
sure is higher than the chart value.
STEP 7 - Stabilize the system.
1. Wait 20 minutes for the system condi-
tion to stabilize between adjustments.
Note: When the Liquid Line Temperature and
Gage Pressure approximately match the chart,
the system is properly charged.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten finger tight plus an ad-
ditional 1/6 turn.
STEP 8 - Verify typical performance.
Refer to System Pressure Curves at the end of
the document to verify typical performance.
STEP 9 - Record System Information for refer-
ence.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
18-AC123D1-1B-EN
20 MIN.
PRESSURE CURVE SAMPLE
Cooling @ 1450 SCFM
550
INDOOR ENTERING
(2)
WET BULB CURVES
500
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
450
400
350
(4)
(3)
300
250
(1)
200
40
60
80
100
120
OUTDOOR TEMPERATURE (Degree F)
170
INDOOR ENTERING
165
WET BULB CURVES
TOP TO BOTTOM
160
71, 67, 63 AND 59 DEG F.
(2)
155
150
145
(5)
(3)
140
135
130
125
120
115
(1)
110
40
60
80
100
120
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSI
Suction Gage Pressure = __________ PSI
Heating @ 1350 SCFM
500
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
450
80, 70, AND 60 DEG F.
400
350
300
250
200
-5
5
15
25
35
45
55
65
140
INDOOR ENTERING
DRY BULB CURVES
130
TOP TO BOTTOM
120
80, 70, AND 60 DEG F.
110
100
90
80
70
60
50
40
30
-5
5
15
25
35
45
55
65
17
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