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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 in the Service
Facts to verify typical performance.
18-AC95D1-1
20 MIN.
(Example only - see Service Facts)
PRESSURE CURVES FOR 4TTX6060E
F
R I
S
T
S
T
A
G
E
4
T
E
E
3
F
6
6
A
1
Cooling with Thermal Expansion Valve
Cooling with Thermal Expansion Valve
INDOOR ENTERING
500
INDOOR ENTERING
500
WET BULB CURVES
WET BULB CURVES
(2)
TOP TO BOTTOM 71,
TOP TO BOTTOM 71,
450
450
67, 63 AND 59 DEG F.
67, 63 AND 59 DEG F.
400
400
350
350
(4)
(3)
(4)
300
300
250
250
(1)
200
200
40
50
60
70
80
90
100
110
120
40
50
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING
180
180
INDOOR ENTERING
WET BULB CURVES
WET BULB CURVES
TOP TO BOTTOM 71,
TOP TO BOTTOM 71,
170
170
67, 63 AND 59 DEG F.
67, 63 AND 59 DEG F.
160
160
(2)
150
150
(5)
(5)
(3)
140
140
130
130
120
120
(1)
110
110
40
50
60
70
80
90
100
110
120
40
50
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .
E
X
A
M
P
E L
F :
R I
T S
S
A T
G
E
E
X
A
M
P
E L
S :
E
C
O
(
) 1
O
U
T
D
O
O
R
T
E
M
. P
8
2
. F
(
) 1
O
U
(
) 2
N I
D
O
O
R
W
E
T
B
U
L
B
6
7
. F
(
) 2
N I
(
) 3
A
T
N I
T
E
R
S
E
C
I T
O
N
(
) 3
A
T
(4) LIQUID PRESSURE @ 1210 CFM IS 306 PSIG
(4) LIQUID PRESSURE @ 1570 CFM IS 288 PSIG
(5) SUCTION PRESSURE @ 1210 CFM IS 139 PSIG
(5) SUCTION PRESSURE @ 1570 CFM IS 144 PSIG
INTERCONNECTING LINES
ACTUAL:
GAS - 1 1/8" O.D.
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
LIQUID - 3/8" O.D.
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
S
E
C
O
N
D
S
T
A
G
E
4
T
E
E
3
F
6
6
A
1
(2)
(3)
(1)
60
70
80
90
100
110
120
(2)
(3)
(1)
60
70
80
90
100
110
120
N
D
S
A T
G
E
T
D
O
O
R
T
E
M
. P
8
2
. F
D
O
O
R
W
E
T
B
U
L
B
6
7
. F
N I
T
E
R
S
E
C
I T
O
N
DWG.NO.
4TTX6060E1
21
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