6
SUCTION PRESSURE
PSIG
R-22
R-410A
50
26
1
52
28
3
54
29
4
56
31
6
58
32
7
60
34
8
62
35
10
64
37
11
66
38
13
68
40
14
70
41
15
72
42
16
74
44
17
76
45
19
78
46
20
80
48
21
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
SATURATED SUCTION
TEMPERATURE ºF
Expansion Valve System
Single Speed Application
1. Purge gauge lines. Connect service gauge manifold to
base-valve service ports. Run system at least 10 min-
utes to allow pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line service valve with adequate contact and insu-
late for best possible reading.
3. Check subcooling and superheat. Systems with TXV ap-
plication should have a subcooling of 7 ± 2 ºF and super-
heat of 7 to 9 ºF.
a.
If subcooling and superheat are low,
adjust
TXV to
7 to 9 ºF superheat, then check subcooling.
NOTE:
To adjust superheat, turn the valve stem clock-
wise to increase and counter clockwise to decrease.
b.
If subcooling is low and superheat is high,
add
charge to raise subcooling to 7 ± 2ºF then check
superheat.
c.
If subcooling and superheat are high,
adjust
TXV
valve to 7 to 9 ºF superheat, then check subcooling.
d.
If subcooling is high and superheat is low,
adjust
TXV valve to 7 to 9 ºF superheat and
remove
charge
to lower the subcooling to 7 ± 2ºF.
NOTE:
Do
NOT
adjust the charge based on suction pres-
sure unless there is a gross undercharge.
4. Disconnect manifold set, installation is complete.
Subcooling Formula = Sat. Liquid Temp. - Liquid Line Temp.
NOTICE
Units with reciprocating compressors and non-bleed TXV’s
require a Hard Start Kit.
LIQUID PRESSURE
PSIG
R-22
R-410A
200
101
70
210
105
73
220
108
76
225
110
78
235
113
80
245
116
83
255
119
85
265
121
88
275
124
90
285
127
92
295
130
95
305
133
97
325
137
101
355
144
108
375
148
112
405
155
118
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
SATURATED LIQUID
TEMPERATURE ºF
Two Speed Application
Run the remote on low stage cooling for 10 minutes until refrig-
erant pressures stabilize. Follow the guidelines and methods
below to check unit operation and ensure that the refrigerant
charge is within limits. Charge the unit on low stage.
1. Purge gauge lines. Connect service gauge manifold to
base-valve service ports.
2. Temporarily install thermometer on liquid (small) line near
liquid line service valve with adequate contact and insu-
late for best possible reading.
3. Check subcooling and superheat. Systems with TXV ap-
plication should have a subcooling of 5 to 7 ºF and super-
heat of 7 to 9 ºF.
a.
If subcooling and superheat are low,
adjust
TXV to
7 to 9 ºF superheat, then check subcooling.
NOTE:
To adjust superheat, turn the valve stem clock-
wise to increase and counter clockwise to decrease.
b.
If subcooling is low and superheat is high,
add
charge
to raise subcooling to 5 to 7 ºF then check super-
heat.
c.
If subcooling and superheat are high,
adjust
TXV
valve to 7 to 9 ºF superheat, then check subcooling.
d.
If subcooling is high and superheat is low,
adjust
TXV valve to 7 to 9 ºF superheat and
remove
charge
to lower the subcooling to 5 to 7 ºF.
NOTE:
Do
NOT
adjust the charge based on suction pres-
sure unless there is a gross undercharge.
4. Disconnect manifold set, installation is complete.
Subcooling Formula = Sat. Liquid Temp. - Liquid Line Temp.