6
Introduction
Model 430
150210
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.)
Water Valve
On a water−cooled unit, the water valve should be set
to maintain a compressor head pressure of 255 PSI
(1,758 kPa).
Water Valve Adjustment
Place your gauge on the high side access port of the
compressor. Turning the adjustment stem on the water
valve clockwise will lower the pressure.
Note: Make this adjustment with mix in the freezing
cylinder and the unit in the AUTO mode. Be sure to
allow adequate time for the pressure to stabilize.
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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