Engineered air PD SERIES, Installation, Operation And Maintenance Manual

Page: 34 / 36

A
PD MANUAL
IOM-39 34 of 36 Aug 99 R1
Table 2
Refrigerant
R407C R134a R410A
Low pressure
control
Cut In
60 psig
(410 kPa)
30 psig
(210 kPa)
105 psig
(720 kPa)
Cut Out
30 psig
(210 kPa)
10 psig
(70 kPa)
75 psig
(520 kPa)
High pressure
control
NO RECEIVER
Cut Out
410 psig
(2830 kPa)
Manual reset
275 psig
(1890 kPa)
Manual reset
610 psig
(4200 kPa)
Manual reset
High pressure
control for
UPW (Water
cooled condenser
– auto reset)
Cut In
200 psig
(1380 kPa)
150 psig
(1030 kPa)
340 psig
(2340 kPa)
Cut Out
325 psig
(2240 kPa)
250 psig
(1720 kPa)
460 psig
(3170 kPa)
High pressure
control
/w Receiver
Cut Out
The lower of that noted above or the maximum rated
working pressure of the receiver or 90% of the receiver PRV.
Hot gas bypass
Start to open pressure.
52 psig
(350 kPa)
30 psig
(210 kPa)
105 psig
(720 kPa)
CFC1
Cut In
290 psig
(1990 kPa)
155 psig
(1060 kPa)
400 psig
(2750 kPa)
Cut Out
220 psig
(1510 kPa)
105 psig
(720 kPa)
300 psig
(2070 kPa)
CFC2
Cut In
310 psig
(2130 kPa)
170 psig
(1170 kPa)
470 psig
(3240 kPa)
Cut Out
240 psig
(1650 kPa)
120 psig
(820 kPa)
350 psig
(2410 kPa)
Tandem
compressor
c/w compressor
loading control
(CLC)
Cut In
98 psig
(675 kPa)
46 psig
(315 kPa)
150 psig
(1030 kPa)
Cut Out
58 psig
(400 kPa)
33 psig
(230 kPa)
115 psig
(790 kPa)
Cylinder Unloading Controls (CUC) should be set to be fully unloaded with a SST no less than
34°F (1°C) and with enough differential to prevent short cycling (no higher than
50 ‐ 55°F (10 ‐ 13°C) SST).