Stulz CyberOne EC DX - 2.8.7 Refrigerant Charging Procedures (Continued); 2.8.8 Refrigerant Characteristics Tables

CyberOne EC DX IOM Manual
4. Add refrigerant charge until the refrigerant level in the
receiver rises to the center of the sight glass, indicating
the receiver is 80% filled.
5. When the refrigerant in the receiver reaches the center
of the sight glass, the unit is fully charged.
CAUTION
Remove the blockage to the air intake of the
condenser.
6. Fill out the applicable sections of Warranty Registration
and Start-Up Checklist.
2.8.8 Refrigerant Characteristics
2.8.8.1 Pressure/Temperature Settings
The following table is provided to assist with the normal
settings of the system for R407C refrigerant. Where
applicable, minimum and maximum settings are given along
with normal operating pressures.
Refrigerant Pressure/Temperature Settings
Sub-cooling °F
Nor*
10
Min
5
Max
20
Superheat °F
15
10
20
Design Condensing Temp. @ 95 °F
Ambient
125 105 140
Suction Pressure (psig)- R407C
70
55
85
Fan Cycling Control- Fan On (psig)-
R407C
320 240 340
Fan Speed Control (psig)- R407C
320
—
—
Flooded HP Control Valve (psig)-
R407C
205
—
—
Nor = Normal, Min = Minimum, Max = Maximum
2.8.8.2 Saturated Refrigerant Pressure Tables
The following refrigerant pressure tables are provided for
reference for R407C refrigerant.
2.9 System Settings and Adjustments
2.9.1 Low/High Pressure Limit Switch
Air conditioning systems utilizing DX refrigerant are
equipped with hermetically sealed high-pressure and low-
pressure switches. These switches are pre-set by the
manufacturer and cannot be adjusted.
R407A Refrigerant
Tempera-
ture (ºF)
Pressure
(psig)
Saturated Evaporating
Temperature
20
78.4
22
81.9
24
85.5
26
89.2
28
93.1
30
97.0
32
101
34
105
36
109
38
114
40
118
42
123
44
128
46
133
48
137
50
143
55
155
60
170
65
185
70
201
75
218
80
236
85
255
90
274
95
295
100
318
105
341
110
365
115
391
120
418
125
446
130
477
135
508
140
541
26