Service manual

HEC-Series Service Manual
SERVICE OPERATIONS
10/21/01
9-21
Adjustment instructions:
1. Connect an accurate pressure gage to the low pressure test connection.
2. Remove the protective cover from over the CPR adjustment screw.
3. While the machine is in a harvest cycle, turn the adjustment screw CW to raise the gage pressure
to 58-60 psig. Then turn the screw CCW (out) gradually until the pressure reaches the
recommended setting (TABLE 9-2) and remains constant during the harvest.
4. Replace the protective cover.
If there is sufficient refrigerant in the receiver, a discharge pressure of 200 psig is maintained during
the freeze and the system is free of noncondensables, ice will release and be cleared from the freezer
within 1 1/2 minutes. Check several cycles after making adjustments.
HEC-10 HEC-20 HEC-30 HEC-40
55psig 55psig 55psig 50psig
TABLE 9-2
CPR Valve Setting
Converting from Cylinder Ice to Crushed Ice (Single Ice Type Machines).
• Remove jumper from #5 and #6 on terminal block and put on #5 and #4. This will reverse the
rotation of the cutter motor.
FIGURE 9-15
Terminal Block Jumper Locations
• Adjust Freezer Pressure switch (FPS2) – See table below for recommended pressure settings