5
Model 428
Introduction
Running Specifications
Expansion Valve Setting
404A/HP62: 35 - 36 PSI (241 - 248 kPa)
Low Side Pressure
Low side pressure = expansion valve setting.
To adjust the low side pressure, place the gauge on
the low side suction port at the compressor. With the
compressor running, turn the adjustment knob of the
automatic expansion valve clockwise to raise low
side pressure and counterclockwise to lower
pressure.
High Side Pressure
Air Cooled: The following chart indicates normal
operating head pressures at various ambient
temperatures:
Ambient Temperature Normal Operating Head
Pressures
F. C. PSI
70_ 21.1_ 240 - 270
(1,655 - 1,862 kPa.)
80_ 26.7_ 270 - 300
(1,862 - 2,069 kPa.)
90_ 32.2_ 300 - 340
(2,069 - 2,344 kPa.)
100_ 37.8_ 340 - 380
(2,344 - 2,620 kPa.)
E.P.R. Valve Setting
The product temperature in the mix hopper is
maintained by the main refrigeration system and can
be adjusted by the E.P.R. valve. The E.P.R. valve
is factory set at 67 ‐ 69 PSI (462 ‐ 476 kPa) in
order to maintain hopper product temperature below
40_F. (4_C.).
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