Specifications

162 Part Number STH12 9/10
NORMAL OPERATING PRESSURES OF
REFRIGERATION UNITS
1. On system with expansion valve (pressure
limiting) evaporator gets no higher than
3.4 bars on R-12
3.7 bars on R-502
5.9 bars on R-22
2. Water system head pressure should be manually
set (adjustable water control valve) tomaintain
40.5°C water condenser out temperature.
3. Remote Condenser system head pressure will be
controlled by Low Ambient Control
5.2 bars on R-12, R-134A
10.3 bars on R-502, R-22, R-404A
R-12 R-502 R-22 R-134A R-404A
Head Pressure bar bar bar bar bar
24°C Condenser
Ambient
10-100% Ice on
Evaporator
6.9-9.7 13.8-17.9 12.4-16.5 7.6-11.0 14.5-19.3
90°F Condenser
Ambient
10-100% Ice on
Evaporator
8.3-11.7 15.9-20.6 14.5-19.3 8.9-12.4 16.5-22.1
R-12 R-502 R-22 R-134A R-404A
Evaporator Pressure bar bar bar bar bar
24°C Evaporator,
or 27°C Water
9.7 9 10.3
10-100% Ice on
Evaporator
0.6-1.4 2.1-3.4 1.7-3.0 0.4-1.2 2.3-3.8