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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.
88-A4AC3001-1J-EN
20 MIN.
PRESSURE CURVE SAMPLE
Cooling @ 1450 SCFM
550
500
INDOOR ENTERING
INDOOR ENTERING
(2)
WET BULB CURVES
DRY BULB CURVES
500
TOP TO BOTTOM
TOP TO BOTTOM
450
80, 70, AND 60 DEG F.
71, 67, 63 AND 59 DEG F.
450
400
400
350
350
(4)
(3)
300
300
250
250
(1)
200
200
40
60
80
100
120
-5
OUTDOOR TEMPERATURE (Degree F)
170
140
INDOOR ENTERING
INDOOR ENTERING
WET BULB CURVES
165
DRY BULB CURVES
130
TOP TO BOTTOM
TOP TO BOTTOM
160
71, 67, 63 AND 59 DEG F.
120
80, 70, AND 60 DEG F.
(2)
155
110
150
100
145
(5)
(3)
90
140
80
135
70
130
60
125
120
50
115
40
(1)
110
30
40
60
80
100
120
-5
107 °F
Heating @ 1350 SCFM
5
15
25
35
45
55
65
5
15
25
35
45
55
65
21
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